Linear Technology DC980A User manual

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dc980abf
DEMO MANUAL
DC980A/DC980B
DESCRIPTION
Dual Power Supply Monitor
and Margining Controller with LTC3828
Dual DC/DC Supply
TheDC980AandDC980Bareademonstrationsystemthat
showcasestheLTC2970,adualpowersupplymonitor and
margining controller with an I2C interface. The DC980A
board contains the LTC2970 device and the DC980B
board contains the LTC3828 dual DC/DC controller. The
two boards interface to each other via a 20-pin connec-
tor. The DC980B board features the LTC3828 dual output,
2-phase synchronous buck regulator. The LTC2970’s
two voltage-buffered, 8-bit IDACs allow highly accurate
margining of the LTC3828’s output voltages. The IDACs
can be configured to automatically servo the power sup-
plies to a desired voltage using the ADC for feedback. The
DC980B comes preconfigured with 3.3V and 5V power
supply rail voltages.
The LTC2970’s low drift reference and 14-bit ∆∑ A/D
converter allow precise measurements of two power sup-
ply output voltages and load currents. Fault management
allows ALERTB to be asserted for configurable over- and
undervoltage fault conditions.
This demonstration system is supported by the
LTpowerPlay™graphicaluserinterface(GUI)whichenables
completecontrolof all thefeaturesof the device.Together,
theLTpowerPlaysoftwareand DC980A/DC980B hardware
system create a powerful development environment for
designing and testing hardware configurations for the
LTC2970.ThesoftwaredisplaystheLTC2970featuresand
provides real time measurements from the device’s ADC
and status registers. Telemetry also allows easy access
of the fault status created by the LTC2970.
The LTC2970 features may be evaluated with the LTC3828
based power supplies, or alternatively the DC980B board
may be removed and DC980A can then be connected to
an external power supply circuit.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
The DC980B demo board is powered by an external 8V
to 15V power supply. To power the DC980A demo board,
you have two choices. It may be powered from either the
DC590 USB-to-I2C controller or from the DC980B board
using an external jumper wire. Communication with the
software is provided through the DC590 USB-to-I2C con-
troller. The following is a checklist of items which can be
obtained from the LTC website or LTC field sales.
nUSB-to-I2C/Serial Controller (DC590)
nLTpowerPlay Software
DC980A/DC980B Features
nMonitors and Margins Two Power Supplies
nTwo Output Voltage Monitors
nTwo Input Voltage Monitors
nTwo Output Current Monitors
nTelemetry Reads Back VIN, VOUT, IOUT, Temperature
nSupported by LTpowerPlay GUI
nI2C Adjustable OV/UV Trip Points
nMargin or Trim Supplies to ±0.5% Accuracy
nI2C/SMBus Serial Interface
nProgrammable GPIO for Fault Reporting
nPowered from External Power Supply
nLTC2970 Available in 24-Pin QFN Package
Design files for this circuit board are available at
http://www.linear.com/demo/DC980

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dc980abf
DEMO MANUAL
DC980A/DC980B
GLOSSARY OF TERMS
The following list contain terms used throughout the
document.
Channel: The collection of functions that monitor, super-
vise, and trim a given power supply rail.
Margin: Term used typically in board level testing that
increases/decreases the output voltage to look for sensi-
tivity/marginality problems.
Monitor: The act of measuring voltage, current, and tem-
perature readings.
Rail: The final output voltage that the power supply con-
troller manages.
Supervise: The act of quickly responding (warning or
faulting) to a voltage or current condition that is compared
to preprogrammed values.
Trim: The act of adjusting the final output voltage. A servo
loop is typically used to trim the voltage.
PERFORMANCE SUMMARY
Specifications are at TA= 25°C
Table 1. LTC2970 Performance Summary
PARAMETER CONDITIONS VALUE
12VIN Supply Input Voltage Range 8V to 15V
VDD Supply Input Voltage Range 4.5V to 5.75V
ADC Full-Scale Accuracy ±0.4%
ADC Total Unadjusted Error VIN = 3V ±0.5%
ADC Input Range 0V to 6V
ADC Resolution Resolution = 8.192V/16384 500µV/LSB
ADC Conversion Rate 30Hz
Margining DAC Resolution 8-Bits
Temperature Sensor Resolution 0.25°C/LSB
I2C Serial Clock Frequency 10kHz to 400kHz
Table 2. Demo Board System Specifications
NOMINAL
UNTRIMMED
VOUT
TOP FEEDBACK
RESISTOR
BOTTOM
FEEDBACK
RESISTOR
DAC RESISTOR IDAC
RESISTOR
MARGIN
RANGE
VOUT1 5V ±1.5% 105k 20k 147k 6.34k ±10%
VOUT2 3.3V ±1.5% 95.3k 30.1k 196k 6.34k ±10%
Notes:
1. Load current < 5A is recommended.
2. Output voltages can be margined by ±10% from nominal with the default resistor values. These values may be changed
to create output voltages other than 5V and 3.3V. Use the Resistor Selection Tool which is accessed from LTpowerPlay.
The LTC3828’s feedback node voltage is 0.8V.

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dc980abf
DEMO MANUAL
DC980A/DC980B
LTpowerPlay GUI SOFTWARE
LTpowerPlay is a powerful Windows-based tool that sup-
ports Linear Technology products, including the LTC2970
dual power supply monitor and margining controller. You
can use LTpowerPlay to evaluate Linear Technology ICs by
connecting to a demo board system. LTpowerPlay utilizes
the DC590 USB I2C/serial controller to communicate with
one of many potential targets, including the DC980A/B
demo system or a customer board. The software also
provides an automatic update feature to keep the software
currentwiththelatestsetofdevicedriversanddocumenta-
tion. The LTpowerPlay software can be downloaded from:
http://www.linear.com/ltpowerplay
To access technical support documents for LTC Power
System Management Products visit Help, View Online
help on the LTpowerPlay menu.
Figure 1. Screenshot of LTpowerPlay GUI
SYSTEM TREE OF
ALL DEVICES
CONFIGURATION SETTINGS FOR
ALL DEVICES IN SYSTEM TREE
REAL-TIME
TELEMETRY DATA
SCOPE-LIKE
TELEMETRY WINDOW
DISPLAY OF SELECTED PARAMETER
(CONFIGURATION OR TELEMETRY) CHIP DASHBOARD

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dc980abf
DEMO MANUAL
DC980A/DC980B
QUICK START PROCEDURE
The following procedure describes how to set up a DC980A, DC980B, and DC590 for demonstration purposes or to
evaluate the performance of the LTC2970.
1. Download and install LTpowerPlay: http://www.linear.com/ltpowerplay
2. The default locations of DC980A’s configuration jumpers are as follows:
JP1
ASEL0
JP2
ASEL1
JP3
GRIO_CFG
JP4
WRITE-
PROTECT
JP5
DAC1
TERMINATION
JP6
DAC0
TERMINATION
JP7
VDD
SOURCE
LO LO GND ON IOUT0 IOUT1 DC590
3. The default locations of DC980B’s configuration jumpers are as follows:
JP1
PHSMD
JP2
FSET
JP3
FCB
JP4
RUN1
JP5
RUN2
JP6
TRACK2
JP7
TRACK1
0 550kHz CCM ON ON EXT1 VOUT1
4. Connect the DC980A and DC980B boards using the 20-pin analog interface connector. Connect DC980A to the
DC590 USB I2C/serial controller using the supplied 14-conductor ribbon cable.
5. Connect a power supply (8V to 15V) to the DC980B’s VIN and GND turrets. Refer to Figure 2 for the connections.
NOTE: Make sure that the input voltage does not exceed 15V. Be sure JP7 on the DC980A board is set to DC590.
Figure 2. Connecting DC980A/DC980B Boards and the DC590 I2C/Serial Controller

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dc980abf
DEMO MANUAL
DC980A/DC980B
QUICK START PROCEDURE
6 .Connect the USB cable from the host computer to the DC590. Launch LTpowerPlay. The software automati-
cally identifies the DC980A and builds a system tree for the LTC2970. The GUI should appear as that shown in
Figure 1.
a. Load default configuration into the LTC2970. From the pull-down menu select Demo > Demo Config.
b. Check for the LTC3828 output voltages by clicking on CHO_A_ADC_LTC2970 or CH1_A_ADC_LTC2970.

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dc980abf
DEMO MANUAL
DC980A/DC980B
QUICK START PROCEDURE
c. Check VDD and V12 input voltages Note: If JP7 is set to DC590 position, the V12 telemetry reading
will be ~5V.

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dc980abf
DEMO MANUAL
DC980A/DC980B
Figure 3. Connecting DC980A/B Boards with VIN Jumper to 12VIN Turret
ALTERNATE DC980A POWERING METHOD
The DC980A board may be powered from the input supply
that powers the DC980B board. This configuration allows
the LTC2970 to make a direct reading of VIN and display
the readback value in the V12_ADC_LTC2970 register in
LTpowerPlay. It requires an external jumper wire. Ensure
thatallpowerisremovedfrombothboards.OntheDC980A
board, move jumper JP7 to the LOCAL position. Place a
jumper wire between the VIN turret of the DC980B and
the 12VIN turret of the DC980A. Note that the LTC2970’s
voltage range is 8V to 15V. Ensure that the DC980B is
powered by a voltage between 8V and 15V. Apply power.
The 12V telemetry register and plot should look like this:

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dc980abf
DEMO MANUAL
DC980A/DC980B
DC980A DETAILS
Figure 4. DC980A Board

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DEMO MANUAL
DC980A/DC980B
DC980B DETAILS
Figure 5. DC980B Board

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dc980abf
DEMO MANUAL
DC980A/DC980B
PARTS LIST—DC980A
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 C1 CAP CER 1µF 16V 20% X7R 0603 TDK C1608X7R1C105M
2 2 C2, C15 CAP TANTALUM 10µF 25V 20% 6032 AVX TAJW106M025R
3 2 C9, C13 CAP CER 0.1µF 16V 20% X7R 0603 AVX 0603YC104MAT
4 1 D1 DIODE, SCHOTTKY 200mW SOT-23 DIODES INC BAT54
5 1 R1 RES 10kΩ 0.1W 5% 0603 SMD VISHAY CRCW0603103JRT6
6 1 R2 RES 100kΩ 0.1W 5% 0603 SMD VISHAY CRCW0603100KFKEA
7 13 R3, R7 TO R11, R15,
R16, R19 TO R23 RES 0Ω 0.1W 0603 SMD VISHAY CRCW0603000ZRT6
8 3 R4, R5, R6 RES 2kΩ 0.1W 1% 0603 SMD VISHAY CRCW06032K00JNEA
9 3 R12, R13, R14 RES 4.99kΩ 0.1W 1% 0603 SMD VISHAY CRCW06034K99JNEA
10 2 R17, R18 RES 6.34kΩ 0.1W 1% 0603 SMD VISHAY CRCW06036K34JNEA
11 1 U1 IC, 2-CH POWER SUPPLY MONITOR AND MARGIN
CONTROLLER LINEAR TECHNOLOGY LTC2970CUFD
12 1 U2 IC, 2k-Bit I2C SERIAL EEPROM MICROCHIP 24LC025-I/ST
Additional Demo Board Circuit Components
13 0 C3, C4, C5, C8, C10 TO
C12, C14 (OPT)OPTION - DO NOT STUFF
14 0 C6, C7 (OPT) OPTION - DO NOT STUFF
Hardware: For Demo Board Only
15 1 J1 2MM PIN HEADER, 2x7 MOLEX 87831-1420
16 1 JP8 CONN HEADER, 2x10 RIGHT ANGLE MILL-MAX 802-10-020-20-001
17 7 JP1 TO JP7 2MM PIN HEADER, 1x3 SAMTEC TMM-103-02-L-S
18 4 MH1 TO MH4 STANDOFF, NYLON SNAP-ON KEYSTONE 8831
19 7 SH1 TO SH7 SHUNT FOR 2MM PIN HEADER SAMTEC 2SN-BK-G
20 18 TP1 TO TP18 TERM SOLDER TURRET 0.219" 0.078"L MILL MAX 2501-2-00-80-00-00-07-0

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dc980abf
DEMO MANUAL
DC980A/DC980B
PARTS LIST—DC980B
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 3 CB1, CB2, C12 CAP CER 0.1µF 16V 10% X7R 0603 MURATA GRM188R71C104KA01D
2 2 CIN1, CIN2 CAP CER 10µF 25V 10% X7R 1210 MURATA GRM32DR71E106KA12L
3 1 CIN3 CAP ALUM 33µF 25V 20% 6.3x6 SMD NICHICON PCV1E330MCL1GS
4 1 COUT1 CAP ALUM POLY 150µF 6.3V 7343 PANASONIC EEF-CX0J151XR
5 1 COUT2 CAP ALUM POLY 180µF 4V 7343 PANASONIC EEF-SX0G181ER
6 2 C2, C15 CAP CER 100pF 50V 5% C0G 0603 MURATA GRM1885C1H101JA01D
7 2 C3, C16 CAP CER 470pF 50V 5% C0G 0603 MURATA GRM1885C1H471JA01D
8 3 C5, C7, C14 CAP CER 1000pF 50V 5% C0G 0603 MURATA GRM1885C1H102JA01D
9 3 C4, C10, C19 CAP CER 1µF 10V 10% X5R 0603 MURATA GRM188R61A105KA61D
10 2 C9, C13 CAP CER 1µF 25V 10% X7R 0805 TDK C2012X7R1E105K125AB
11 1 C11 CAP TANT 4.7µF 10V 0805 MURATA GRM21BR71A475KA73K
12 2 C20, C21 CAP CER 10nF 25V 10% X7R 0603 MURATA GRM188R71E103KA01D
13 2 D1, D3 SCHOTTKY DIODE 30V 0.1A SOD-323 CENTRAL SEMI CMDSH-3 TR
14 2 L1, L2 INDUCTOR, 2.2µH WÜRTH 74437346022
15 2 Q1, Q2 MOSFET Nch DUAL PWR SW 30V 12mΩ SO8 IR IRF8313PBF
16 5 R1, R7, R11, R12, RIN1 RES 10Ω 0.1W 5% 0603 VISHAY CRCW060310R0JNEA
17 2 R2, R16 RES 10kΩ 0.1W 1% 0603 SMD VISHAY CRCW0603103JRT6
18 2 R3, R18 RES 100kΩ 0.1W 1% 0603 SMD VISHAY CRCW0603100KFKEA
19 2 R4, R10 RES 42.2kΩ 0.1W 1% 0603 SMD VISHAY CRCW060349K2FKEA
20 3 R5, R20, R21 RES 20kΩ 0.1W 1% 0603 SMD VISHAY CRCW060320K0FKEA
21 1 R6 RES 105kΩ 0.1W 1% 0603 SMD VISHAY CRCW0603105KFKEA
22 2 R13, R26 RES 30.1kΩ 0.1W 1% 0603 SMD VISHAY CRCW060330K1FKEA
23 2 R14, R24 RES 95.3kΩ 0.1W 1% 0603 SMD VISHAY CRCW060395K3FKEA
24 2 R19, R22 RES 8.2kΩ 0.1W 5% 0603 SMD VISHAY CRCW06038K20FKEA
25 1 R27 RES 1kΩ 0.1W 5% 0603 SMD VISHAY CRCW06031K00JNEA
26 1 R28 RES 147kΩ 0.1W 1% 0603 SMD VISHAY CRCW0603147KFKEA
27 1 R29 RES 196kΩ 0.1W 1% 0603 SMD VISHAY CRCW0603196KFKEA
28 2 RSENS1, RSENS2 RES 0.01Ω 0.5W 1% 1206 STACKPOLE CSR1206FK10L0
29 1 U1 IC, 2-CH STEP DOWN CONTROLLER QFN28 LINEAR TECHNOLOGY LTC3828EUH

12
dc980abf
DEMO MANUAL
DC980A/DC980B
PARTS LIST—DC980B
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Additional Demo Board Circuit Components
30 0 C6, C17 (OPT) CAP CER 180PF NPO 5% 0603 (OPT) DO NOT INSTALL
31 0 C22 (OPT) CAP CER 10nF 25V 10% X7R 0603 (OPT) DO NOT INSTALL
32 0 D4, D2 (OPT) DIODE, POWERMITE (OPT) DO NOT INSTALL
33 0 D5 (OPT) DIODE, SOT-323 (OPT) DO NOT INSTALL
34 0 Q3, Q4 (OPT) MOSFET Nch DUAL PWR SW 30V SO8 (OPT) DO NOT INSTALL
35 0 Q5, Q6 (OPT) MOSFET Nch DUAL PWR SW 30V SO8 (OPT) DO NOT INSTALL
36 0 R8, R9, R23, R25 (OPT) RES USER SELECTABLE 0603 (OPT) DO NOT INSTALL
37 4 R15, R17, R30, R31 RES 0Ω 0.1W 0603 SMD VISHAY CRCW0603000ZRT6
38 4 R32 TO R35 RES 10Ω 1/16W 5% 0603 PANASONIC ERJ-3EKF10R0V
Hardware: For Demo Board Only
39 7 E1, E2, E5, E7,
E12 TO E14 TERM SOLDER TURRET 0.156"H 0.084"L MILL MAX 2308-2-00-80-00-00-07-0
40 6 E4, E6, E8 TO E11 TERM SOLDER TURRET 0.219" 0.078"L MILL MAX 2501-2-00-80-00-00-07-0
41 7 JP1 TO JP7 2MM PIN HEADER 1X3 WÜRTH 620 003 111 21
42 1 JP8 CONN RECEPT, 2x10 RIGHT ANGLE MILL-MAX 803-93-020-20-001
43 4 MH1 TO MH4 STANDOFF, NYLON SNAP-ON KEYSTONE 8831
44 7 SH1 TO SH7 SHUNT FOR 2MM PIN HEADER WÜRTH 608 002 134 21

13
dc980abf
DEMO MANUAL
DC980A/DC980B
SCHEMATIC DIAGRAM
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
A A B B C C D D
ASEL0
SDA SCL
IN0A+ IN0A- IN0B+ IN0B- IN1A+ IN1A- IN1B+
ASEL1
IN1B-
GPIO_1 GPIO_0 ALERTB
IOUT0 IOUT1
VIO
GPIO_CFG
GPIO_CFG
GPIO_0
GPIO_1
VDD
VDD
VDD
VDD
VDD
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
TYPO CORRECTIONS AND PARTS MADE OPT.
210/25/05
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
TYPO CORRECTIONS AND PARTS MADE OPT.
210/25/05
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
TYPO CORRECTIONS AND PARTS MADE OPT.
210/25/05
Customer Notice:
Linear Technology has made a best effort to
design a circuit that meets customer-supplied specifications; however, it remains the customers responsibility to verify proper
and reliable operation in the actual application, Component
substitution and printed circuit board layout may significantly affect circuit performance or reliability. Contact Linear
Applications Engineering for assistance.
This circuit is proprietary to Linear Technology and supplied for use with Linear Technology parts.
Customer Notice:
Linear Technology has made a best effort to
design a circuit that meets customer-supplied specifications; however, it remains the customers responsibility to verify proper
and reliable operation in the actual application, Component
substitution and printed circuit board layout may significantly affect circuit performance or reliability. Contact Linear
Applications Engineering for assistance.
This circuit is proprietary to Linear Technology and supplied for use with Linear Technology parts.
Customer Notice:
Linear Technology has made a best effort to
design a circuit that meets customer-supplied specifications; however, it remains the customers responsibility to verify proper
and reliable operation in the actual application, Component
substitution and printed circuit board layout may significantly affect circuit performance or reliability. Contact Linear
Applications Engineering for assistance.
This circuit is proprietary to Linear Technology and supplied for use with Linear Technology parts.
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN CHECKED APPROVED ENGINEER DESIGNER
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
TOLERANCE ON ANGLE - - -
2 PLACES - - - 3 PLACES - - -
INTERPRET DIM AND TOL
PER ASME Y14.5M -1994
THIRD ANGLE PROJECTION
DO NOT SCALE DRAWING
TECHNOLOGY
1630 McCarthy Blvd. Milpitas, CA 95035 Phone: [phone] Fax: [phone]
2
DC980A
Tuesday, December 06, 2005
11
SCH, LTC2970CUFD, DUAL POWER SUPPLY
MONITOR AND MARGIN CONTROLLER
980A.DSNNONE
Chris Pollard 10/25/05
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN CHECKED APPROVED ENGINEER DESIGNER
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
TOLERANCE ON ANGLE - - -
2 PLACES - - - 3 PLACES - - -
INTERPRET DIM AND TOL
PER ASME Y14.5M -1994
THIRD ANGLE PROJECTION
DO NOT SCALE DRAWING
TECHNOLOGY
1630 McCarthy Blvd. Milpitas, CA 95035 Phone: [phone] Fax: [phone]
2
DC980A
Tuesday, December 06, 2005
11
SCH, LTC2970CUFD, DUAL POWER SUPPLY
MONITOR AND MARGIN CONTROLLER
980A.DSNNONE
Chris Pollard 10/25/05
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN CHECKED APPROVED ENGINEER DESIGNER
UNLESS OTHERWISE SPECIFIED
DIMENSIONS ARE IN INCHES
TOLERANCE ON ANGLE - - -
2 PLACES - - - 3 PLACES - - -
INTERPRET DIM AND TOL
PER ASME Y14.5M -1994
THIRD ANGLE PROJECTION
DO NOT SCALE DRAWING
TECHNOLOGY
1630 McCarthy Blvd. Milpitas, CA 95035 Phone: [phone] Fax: [phone]
2
DC980A
Tuesday, December 06, 2005
11
SCH, LTC2970CUFD, DUAL POWER SUPPLY
MONITOR AND MARGIN CONTROLLER
980A.DSNNONE
Chris Pollard 10/25/05
(8 - 15V)
WRITE-PROTECT
GPIO_CFG
VDD SOURCE
LOCAL DC590A
ASELO ASEL1
HI LO LO HI
IOUT1 IOUT0 GND GND
ON
OFF
GND
DAC 1 TERMINATION TERMINATION
DAC 0
PORT
2
I C
ANALOG INTERFACE
(option)
(option)
(0 - 6 V) (0 - 6 V) (0 - 6 V) (0 - 6 V) (0 - 6 V) (0 - 6 V) (0 - 6 V) (0 - 6 V)
4.5 - 5.75V
HI
R15 0 R15 0
C3 [option]C3 [option]
TP3
VIN0A+
TP3
VIN0A+
R12 4.99K R12 4.99K
1
2
3
JP7JP7
TP14
ALERTB
TP14
ALERTB
C5 [option]C5 [option]
R13 4.99K R13 4.99K
TP9
VIN1B+
TP9
VIN1B+
C14 [option]C14 [option]
TP1
VDD
TP1
VDD
R9 0 R9 0
R14 4.99K R14 4.99K
TP4
VIN0A-
TP4
VIN0A-
C11 [option]C11 [option]
VIN0_A+
1
VIN0_A-
2
VIN0_B+
3
VIN0_B-
4
VIN1_A+
5
VIN1_A-
6
VIN1_B+
7
VIN1_B-
8
VDD
9
ALERT 17
SCL 18
16
GPIO_0
GPIO_CFG 20
ASEL1 21
ASEL0 22
REF 23
REF_GND 24
SDA 19
12VIN
10
VOUT0
11
VOUT1
12
IOUT1 13 IOUT0 14
GPIO_1 15
GND 25
U1
LTC2970CUFD
U1
LTC2970CUFD
R22 0 R22 0
R11 0 R11 0
TP13
GPIO_0
TP13
GPIO_0
R17
6.34K
R17
6.34K
C4 [option]C4 [option]
D1
BAT54
D1
BAT54
1
2
3
JP2JP2
R20 0 R20 0
TP16
VOUT0
TP16
VOUT0
R2 100K R2 100K
C1 1uFC1 1uF
R6 2K R6 2K
1
2
3
JP5JP5
C10 [option]C10 [option]
R10 0 R10 0
R18
6.34K
R18
6.34K
TP10
VIN1B-
TP10
VIN1B-
R8 0 R8 0
R4 2K R4 2K
R19 0 R19 0
A0
1
SCL 6
A2
3
VSS
4SDA 5
A1
2WP 7
VCC 8
U2 24LC025 U2 24LC025
R3 0 R3 0
C6
[option]
C6
[option]
1
2
3
JP1JP1
R16 0 R16 0
TP11
GPIO_1
TP11
GPIO_1
TP12
12VIN
TP12
12VIN
C13 0.1uF C13 0.1uF
TP17
IOUT1
TP17
IOUT1
R1 10K R1 10K
C9 0.1uF C9 0.1uF
C7
[option]
C7
[option]
TP6
VIN0B-
TP6
VIN0B-
+
C15 10uF
+
C15 10uF
R5 2K R5 2K
+
C2 10uF
+
C2 10uF
TP2
GND
TP2
GND
1
2
3
JP3JP3
C8 [option]C8 [option]
1 2 3 4 5 6 7 8 9
10 11 12 13 14
J1J1
TP18
VOUT1
TP18
VOUT1
TP8
VIN1A-
TP8
VIN1A-
R23 0 R23 0
R7 0 R7 0
TP5
VIN0B+
TP5
VIN0B+
R21 0 R21 0
C12 [option]C12 [option]
12
34
56
78
910
1112
1314
1516
1718
1920
JP8JP8
TP7
VIN1A+
TP7
VIN1A+
TP15
IOUT0
TP15
IOUT0
1
2
3
JP4JP4
1
2
3
JP6JP6

14
dc980abf
DEMO MANUAL
DC980A/DC980B
SCHEMATIC DIAGRAM
5 5
4 4
3 3
2
2
1 1
D
D
C
C
B
B
A
A
INTVCC
INTVCC
SW1
VIN
SW2
TG2
BG2
TG1 BG1
INTVCC
VIN
TRCKSS2
TRCKSS1
VOUT1
VOUT2
TRCKSS2
VOUT1VOUT2
TRCKSS1
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN CHECKED APPROVED ENGINEER DESIGNER
TECHNOLOGY
1630 McCarthy Blvd. Milpitas, CA 95035 Phone: [phone] Fax: [phone]
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
CUSTOMER NOTICE
2
DC980B
12
Chris Pollard 10/25/05
Andy Gardner 10/25/05
LTC3828EUH Dual Output Step-Down DC/DC with Tracking
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN CHECKED APPROVED ENGINEER DESIGNER
TECHNOLOGY
1630 McCarthy Blvd. Milpitas, CA 95035 Phone: [phone] Fax: [phone]
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
CUSTOMER NOTICE
2
DC980B
12
Chris Pollard 10/25/05
Andy Gardner 10/25/05
LTC3828EUH Dual Output Step-Down DC/DC with Tracking
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN CHECKED APPROVED ENGINEER DESIGNER
TECHNOLOGY
1630 McCarthy Blvd. Milpitas, CA 95035 Phone: [phone] Fax: [phone]
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
CUSTOMER NOTICE
2
DC980B
12
Chris Pollard 10/25/05
Andy Gardner 10/25/05
LTC3828EUH Dual Output Step-Down DC/DC with Tracking
VIN
7V to 21V
VOUT1
5V/5A
3.3V/5A
VOUT2
PGOOD
PLLIN/FCB
CLKOUT
PHSMD
GND
GND GND
RUN2
RUN1
DCM CCM
ON OFF
OFF
ON
FCB
FSET
550KHz
250kHz
PHSMD
DRVCC
TRACEXT1 TRACEXT2
TRACK2 TRACK1
2TXE1TXE 1TUOV2TUOV
1 0
ANALOG INTERFACE
C9
1.0uF
25V
C9
1.0uF
25V
R17 0R17 0 12
34 56 7 8
9 10
11 12 13 14 15 16 17 18 19 20
JP8JP8
CB1
0.1uF
CB1
0.1uF
C16 470pF C16 470pF
RSENS2
0.008
RSENS2
0.008
L1
2.2uH
L1
2.2uH
R8
opt.
R8
opt.
1
2
3
JP2JP2
R34
10
R34
10
R15
0
R15
0
1
2
3
JP4JP4
R14
95.3K 1%
R14
95.3K 1%
C21
0.01uF
C21
0.01uF
E5E5
C20
0.01uF
C20
0.01uF
E2E2
E6E6
R32
10
R32
10
R26 30.1K R26 30.1K
R3
100K
R3
100K
1
2
3
JP1JP1
+ COUT1
220uF
6.3V
+ COUT1
220uF
6.3V
C10 1.0uF C10 1.0uF E8E8
L2
2.2uH
L2
2.2uH
E7E7
1
2
3
JP3JP3
C15 100pF C15 100pF
+CIN3
33uF
35V
+CIN3
33uF
35V
R20
20K
R20
20K
R5
20K 1%
R5
20K 1%
R7
10
R7
10
R4 42.2KR4 42.2K
R28
147K 1%
R28
147K 1%
R31 0R31 0
C13
1.0uF
25V
C13
1.0uF
25V
R22 8.2K R22 8.2K
R9
opt.
R9
opt.
RSENS1
0.007
RSENS1
0.007
R13
30.1K 1%
R13
30.1K 1%
C2
100pF
C2
100pF
D1
CMDSH-3
D1
CMDSH-3
R11
10
R11
10
C4
1.0uF
C4
1.0uF
D4
opt.
D4
opt.
E14E14
R30 0R30 0
1
2
3
JP7JP7
RIN1
10
RIN1
10
E9E9
D3
CMDSH-3
D3
CMDSH-3
1
2
3
JP5JP5
4
3
6
78
1
2
5
Q1Q1
IRF8313PBF
CIN2
10uF
25V
CIN2
10uF
25V
C3
470pF
C3
470pF
4
3
6
78
1
2
5
Q2Q2
IRF8313PBF
R6
105K 1%
R6
105K 1%
R27 1K R27 1K
E1E1
C5
1000pF
C5
1000pF
C12
0.1uF
C12
0.1uF
C14
1000pF
C14
1000pF
E12E12
R35
10
R35
10
R18
100K
R18
100K
R23
opt.
R23
opt. R24
95.3K
R24
95.3K
D2
opt.
D2
opt.
E10E10
R33
10
R33
10
+ COUT2
220uF
4V
+ COUT2
220uF
4V
C22 opt. C22 opt.
E11E11
R10 42.2KR10 42.2K
CIN1
10uF
25V
CIN1
10uF
25V
R1 10 R1 10
C17 opt. C17 opt.
E4E4
D5
opt.
D5
opt.
C19
1.0uF
C19
1.0uF
1
2
3
JP6JP6
R12
10
R12
10
ITH1
30
TRCKSS1
29
SENSE1+
31
VOSENSE1
1
PLLFLTR
2
SENSE1-
32
RUN1
3
FCB/PLLIN
5
SGND
6
TRCKSS2
7
SENSE2-
10
SENSE2+
11
ITH2
12
VOSENSE2
13
NC
8
NC
9
PGOOD 27
CLKOUT 28
BOOST1 26
TG1 25
SW1 24
VIN 23
DRVCC 21
INTVCC 22
BG1 19
PGND 20
BG2 18
SW2 17
TG2 16
BOOST2 15
RUN2 14
PHSMD
4
U1
LTC3828EUH
U1
LTC3828EUH
R25
opt.
R25
opt.
C6
opt.
C6
opt.
CB2 0.1uF CB2 0.1uF
R21
20K
R21
20K
R16
10K
R16
10K
R19
8.2K
R19
8.2K
C7
1000pF
C7
1000pF
R2
10K
R2
10K
+C11
4.7uF
10V
+C11
4.7uF
10V
E13E13
R29
196K 1%
R29
196K 1%

15
dc980abf
DEMO MANUAL
DC980A/DC980B
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
DD
CC
B B
AA
VIN VIN
TG1
BG1
TG2
BG2
SW2
SW1
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN CHECKED APPROVED ENGINEER DESIGNER
TECHNOLOGY
1630 McCarthy Blvd. Milpitas, CA 95035 Phone: [phone] Fax: [phone]
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
CUSTOMER NOTICE
2
DC980B
Wednesday, October 26, 2005
2
Chris Pollard 10/25/05
Andy Gardner 10/25/05
Dual Output Stepdown DC/DC with Tracking LTC3828EUH
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN CHECKED APPROVED ENGINEER DESIGNER
TECHNOLOGY
1630 McCarthy Blvd. Milpitas, CA 95035 Phone: [phone] Fax: [phone]
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
CUSTOMER NOTICE
2
DC980B
Wednesday, October 26, 2005
2
Chris Pollard 10/25/05
Andy Gardner 10/25/05
Dual Output Stepdown DC/DC with Tracking LTC3828EUH
SIZE
SCALE:
CAGE CODE
DWG NO
REV
SHEET OF
FILENAME:
TITLE
CONTRACT NO.
APPROVALS
DATE
DRAWN CHECKED APPROVED ENGINEER DESIGNER
TECHNOLOGY
1630 McCarthy Blvd. Milpitas, CA 95035 Phone: [phone] Fax: [phone]
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
CUSTOMER NOTICE
2
DC980B
Wednesday, October 26, 2005
22
Chris Pollard 10/25/05
Andy Gardner 10/25/05
Dual Output Stepdown DC/DC with Tracking LTC3828EUH
Optional Circuit
4
5
123
6 7 8
Q3 HAT2168H Q3 HAT2168H
4
5
123
678
Q5 HAT2165H Q5 HAT2165H
4
5 1 2 3
6 7 8
Q6 HAT2165H Q6 HAT2165H
4
5
123
6 7 8
Q4 HAT2168H Q4 HAT2168H

16
dc980abf
DEMO MANUAL
DC980A/DC980B
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2015
LT 0915 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC ) provides the enclosed product(s) under the following AS IS conditions:
Thisdemonstration board (DEMOBOARD) kit beingsold or providedby Linear Technology isintended for usefor ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete
in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety
measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union
directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations.
If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 30 days from the date
of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU
OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS
FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR
ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES.
The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims
arising from the handling or use of the goods. Due to the open construction of the product, it is the user’s responsibility to take any and all
appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or
agency certified (FCC, UL, CE, etc.).
No License is granted under any patent right or other intellectual property whatsoever. LT C assumes no liability for applications assistance,
customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind.
LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive.
Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and
observe good laboratory practice standards. Common sense is encouraged.
This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation

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