Linear Technology DC2003A Quick setup guide

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DEMO MANUAL DC2003A
Description
LTC3622EDE
17V, Dual 1A, Synchronous Step-Down Regulator
with Ultralow Quiescent Current
Demonstration circuit 2003A is a synchronous step-down
regulatorusingthepower-saving LTC3622EDE monolithic
buck regulator in a compact 14-pin DFN (4mm × 3mm)
package. The DC2003A operates from an input voltage
range of 2.7V to 17V and provides dual 1A outputs with
an adjustable output voltage range from 1.2V to 5V. The
LTC3622 IC quiescent current can be as low as 5µA in
BurstMode
®
operation with both channels enabledand less
than 0.1µA in shutdown mode. The switching frequency is
fixed to 1MHz or 2.25MHz with a ±50% synchronization
range to an external clock. A user-selectable mode input
is provided to allow the user to trade off ripple noise for
L, LT, LTC, LTM, Linear Technology, Burst Mode and the Linear logo are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective
owners.
performance summary
light load efficiency. Burst Mode operation provides the
highestefficiency at light loads, while pulse-skipping mode
provides the lowest ripple noise.
It is recommended to read the data sheet LTC3622 with
this demo manual prior to working on or making any
changes to DC2003A.
Design files for this circuit board are available at
http://www.linear.com/demo
Specifications are at TA= 25°C
PARAMETER CONDITIONS VALUE
Default IC LTC3622EDE
Default Switching Frequency 1MHz
Default Operation Mode Burst Mode Operation
Input Voltage Range 2.7V to 17V
Onboard User Selectable Output Voltages VIN = 2.7V to 17V, IOUT1 = IOUT2 = 0A to 1A
(VOUT ≤ VIN)
VOUT1: 1.2V, 1.8V, 2.5V, 3.3V
VOUT2: 1.5V, 1.8V, 3.3V, 5V
Default Output Voltage VOUT1 = 3.3V
VOUT2 = 5V
Per Channel Maximum Continuous Output
Current
VIN = 2.7V to 17V IOUT1 = IOUT2 = 1A
Efficiency, VOUT1 (Burst Mode Operation) VIN = 12V, VOUT1 = 3.3V, IOUT1 = 1A 88.2% (See Figure 3)
Efficiency, VOUT2 (Burst Mode Operation) VIN = 12V, VOUT2 = 5.V, IOUT2 = 1A 90.8% (See Figure 4)
Output Voltage Ripple, VOUT1 VIN = 12V, VOUT1 = 3.3V, IOUT1 = 1A <5.9mVP-P (See Figure 5)
Output Voltage Ripple, VOUT2 VIN = 12V, VOUT2 = 5V, IOUT2 = 1A <7.8mVP-P (See Figure 6)
Load Transient Response, VOUT1 VIN = 12V, VOUT1 = 3.3V, IOUT1 = 100mA to 1A See Figure 7
Load Transient Response, VOUT2 VIN = 12V, VOUT2 = 5V, IOUT2 = 100mA to 1A See Figure 8
Thermal Image VIN = 12V, VOUT1 = 3.3V, VOUT2 = 5V, IOUT1 = IOUT2 = 1A See Figure 9
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DEMO MANUAL DC2003A
Quick start proceDure
Demonstration circuit 2003A is easy to set up to evaluate
the performance of the LTC3622. Please refer to Figure 1
for proper measurement equipment setup and follow the
procedure below:
1. Place jumpers in the following positions:
Table 1. Jumper Selection
JP1 JP2 JP3 JP4 JP5
RUN1 RUN2 MODE/SYNC PHASE ILIM
ON ON BURST 180° 1A
2. Place VO1 SELECT jumper in 3.3V position (JP9) and
VO2 SELECT jumper in 5V position (JP14).
3. With power off, connect the input power supply at VIN1
and GND.
4. Connect the Loads between VOUT1 and GND, VOUT2 and
GND. Preset the loads to 0A.
5. Connect the DMMs to the input and output to monitor
the input voltage and output voltages.
6. Turn on the power supply at the input. The RUN1 and
RUN2 pin jumpers should be at ON position. Measure
and make sure the input supply voltage is 12V. The
output voltage VOUT1 should be 3.3V±1%, and VOUT2
should be 5V±1%.
7. Once the input and output voltages are properly es-
tablished adjust theloads within the operating range (0A
to 1A max) and observe the output voltage regulations,
output ripple voltages, switch node wave-forms and
other parameters. Refer to Figure 2 for proper input/
output voltage ripple measurement.
8. To select other output voltages, use the on board user
selectable output voltage jumpers. Shutting down
LTC3622 by placing RUN1 and RUN2 pin jumpers to
the OFF position or turn off the input power supply.
Refer to the following tables (Table 2 and Table 3) for
the output voltage selections and repeat step 3 to 6:
Table 2. VOUT1 Jumper Selection
JP6 JP7 JP8 JP9 JP10
1.2V 1.8V 2.5V 3.3V *USER SELECT
Table 3. VOUT2 Jumper Selection
JP11 JP12 JP13 JP14 JP15
1.5V 1.8V 3.3V 5V *USER SELECT
*Note: If JP10 or JP15 is selected, R5 or R15 needs to be calculated
and inserted to obtain the desired output voltage.
Note 1: To measure the input/output voltage ripple prop-
erly, do not use the long ground lead on the oscilloscope
probe. See Figure 2 for the proper scope probe technique.
Short, stiff leads need to be soldered to the (+) and (–)
terminals of an output capacitor. The probe’s ground ring
needs to touch the (–) lead and the probe tip needs to
touch the (+) lead.
Note 2: DC2003A can also be used to evaluate
LTC3622EDE-2 (2.25MHz) by simply changing U1 to
LTC3622EDE-2, L1 to 1µH(Coilcraft XFL4020-102ME)
and L2 to 2.2µH (Coilcraft XFL4020-222ME).
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DEMO MANUAL DC2003A
Quick start proceDure
+ –
VOUT GND
COUT
Figure 1. Proper Equipment Measurement Setup
Figure 2. Scope Probe Placements for Measuring Input or Output Ripple
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DEMO MANUAL DC2003A
LOAD CURRENT (A)
EFFICIENCY (%)
DC2003A F03
100
80
90
60
70
40
50
20
30
0.0001 0.1 10.010.001
BURST MODE OPERATION
PULSE-SKIPPING MODE
LOAD CURRENT (A)
EFFICIENCY (%)
DC2003A F04
100
80
90
60
70
40
50
20
30
0.0001 0.1 10.010.001
BURST MODE OPERATION
PULSE-SKIPPING MODE
Quick start proceDure
Figure 3. VOUT1 Measured Efficiency at VIN = 12V, VOUT1 = 3.3V, L1 = 3.3µH,
FSW = 1MHz (with VOUT2 OFF)
Figure 4. VOUT2 Measured Efficiency at VIN = 12V, VOUT2 = 5V, L2 = 4.7µH,
FSW = 1MHz (with VOUT1 OFF)
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DEMO MANUAL DC2003A
DC2003a F05
20MHz BW LIMIT
VOUT1
10mV/DIV
t(2µs/DIV)
DC2003a F06
20MHz BW LIMIT
VOUT2
10mV/DIV
t(2µs/DIV)
Quick start proceDure
Figure 5. VOUT1 Measured Output Voltage Ripple at VIN = 12V, VOUT1 = 3.3V, IOUT1 = 1A, FSW = 1MHz
Figure 6. VOUT2 Measured Output Voltage Ripple at VIN = 12V, VOUT2 = 5V, IOUT2 = 1A, FSW = 1MHz
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DEMO MANUAL DC2003A
DC2003a F08
IOUT2: 100mA-1A
IOUT2
0.5A/DIV
VOUT2
200mV/DIV
t(100µs/DIV)
DC2003a F07
IOUT1: 100mA-1A
IOUT1
0.5A/DIV
VOUT1
200mV/DIV
t(100µs/DIV)
Quick start proceDure
Figure 7. Load Transient Response at VIN = 12V, VOUT1 = 3.3V, IOUT1 = 100mA-1A, FSW = 1MHz, Burst Mode Operation
Figure 8. Load Transient Response at VIN = 12V, VOUT2 = 5V, IOUT2 = 100mA-1A, FSW = 1MHz, Burst Mode Operation
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DEMO MANUAL DC2003A
DC2003a F09
Quick start proceDure
Figure 9. Thermal Performance at VIN = 12V, VOUT1 = 3.3V, IOUT1 = 1A, VOUT2 = 5V, IOUT2 = 1A, FSW = 1MHz, No Airflow
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DEMO MANUAL DC2003A
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 2 CFF1, CFF2 CAP, 0402 22pF 5% 50V NPO AVX 04025A220JAT2A
2 2 CIN1, CIN2 CAP, 7343 22µF 20% 35V TANT AVX TPSY226M035R0200
3 2 C1, C2 CAP, 1206 47µF 20% 16V X5R TDK C3216X5R1C476M160AB
4 2 C5, C6 CAP, 1206 10µF 20% 25V X5R TDK C3216X5R1E106M
5 1 C7 CAP, 0402 1µF 20% 10V X5R TDK C1005X5R1A105M
6 1 L1 IND, 3.3µH 20% COILCRAFT XFL4020-332MEC
7 1 L2 IND, 4.7µH 20% COILCRAFT XFL4020-472MEC
8 2 RPG1, RPG2 RES, 0402 100kΩ 1% 1/16W VISHAY CRCW0402100KFKED
9 3 RSET1, R1, RSET2 RES, 0402 619kΩ 1% 1/16W VISHAY CRCW0402619KFKED
10 2 R2, R12 RES, 0402 309kΩ 1% 1/16W VISHAY CRCW0402309KFKED
11 1 R3 RES, 0402 196kΩ 1% 1/16W VISHAY CRCW0402196KFKED
12 2 R4, R13 RES, 0402 137kΩ 1% 1/16W VISHAY CRCW0402137KFKED
13 1 R6 RES, 0805 0Ω JUMPER VISHAY CRCW08050000Z0ED
14 2 R7, R8 RES, 0402 0Ω JUMPER VISHAY CRCW04020000Z0ED
15 1 R11 RES, 0402 412kΩ 1% 1/16W VISHAY CRCW0402412KFKED
16 1 R14 RES, 0402 84.5kΩ 1% 1/16W VISHAY CRCW040284K5FKED
17 1 U1 IC, DUAL SYNCHRONOUS STEP-DOWN CONVERTER LINEAR TECHNOLOGY LTC3622EDE
Additional Demo Board Circuit Components
1 0 C3, C4 CAP, 0402 OPTION OPTION
2 0 R5, R15 RES, 0402 OPTION OPTION
Hardware: For Demo Board Only
1 12 E1, E2, E3, E4, E5, E6, E7, E8,
E9, E10, E11, E12
TURRET MILL-MAX 2501-2-00-80-00-00-07-0
2 2 JP1, JP2 HEADER, 3PIN, 2mm SULLINS NRPN031PAEN-RC
3 2 JP3, JP5 HEADER, 3PIN, DBL ROW 2mm SULLINS NRPN032PAEN-RC
4 1 JP4 HEADER, 2mm DBL ROW (2X2) 4PIN SULLINS NRPN022PAEN-RC
5 10 JP6, JP7, JP8, JP9, JP10, JP11,
JP12, JP13, JP14, JP15
HEADER, 2PIN, 2mm SULLINS NRPN021PAEN-RC
6 7 XJP1, XJP2, XJP3, XJP4, XJP5,
XJP6, XJP13
SHUNT, 2mm SAMTEC 2SN-BK-G
7 4 MH1, MH2, MH3, MH4 STANDOFF, SNAP ON KEYSTONE_8831
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DEMO MANUAL DC2003A
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
D D C C B B A A
1A
SYNC
BURST
PULSE-SKIP
1A
PCB NO.
VOUT1 VOUT2
180
0
SELECT
SELECT
INTVCC
INTVCC
INTVCC INTVCC INTVCC
INTVCC
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
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 CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Tuesday, June 10, 2014
11
DUAL WIDE VIN SYNCHRONOUS BUCK REGULATOR
` \
HAORAN W.
N/A
LTC3622EDE DEMO CIRCUIT 2003A
WITH ULTRA-LOW QUIESCENT CURRENT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
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 CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Tuesday, June 10, 2014
11
DUAL WIDE VIN SYNCHRONOUS BUCK REGULATOR
` \
HAORAN W.
N/A
LTC3622EDE DEMO CIRCUIT 2003A
WITH ULTRA-LOW QUIESCENT CURRENT
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY Fax: [phone]
Milpitas, CA 95035 Phone: [phone] McCarthy Blvd. LTC Confidential-For Customer Use Only
CUSTOMER NOTICE
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 CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
2
Tuesday, June 10, 2014
11
DUAL WIDE VIN SYNCHRONOUS BUCK REGULATOR
` \
HAORAN W.
N/A
LTC3622EDE DEMO CIRCUIT 2003A
WITH ULTRA-LOW QUIESCENT CURRENT
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
TOM G.PROTO1 06/26/12
2
PROD 01/23/14 HAORAN W.
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
TOM G.PROTO1 06/26/12
2
PROD 01/23/14 HAORAN W.
REVISION HISTORY
DESCRIPTION DATE APPROVEDECO REV
TOM G.PROTO1 06/26/12
2
PROD 01/23/14 HAORAN W.
JP9 3.3V JP9 3.3V
C7
1uF
C7
1uF
JP10 USER SELECT JP10 USER SELECT
JP3
MODE/SYNC
JP3
MODE/SYNC
1 2 3 4 5 6
R2 309k 1% R2 309k 1%
+
CIN2 22uF
35V
7343
+
CIN2 22uF
35V
7343
R14 84.5K 1% R14 84.5K 1%
RPG1 100k 1% RPG1 100k 1%
R11 412k 1% R11 412k 1%
JP15 USER SELECT JP15 USER SELECT
R15 OPT R15 OPT
E2
SYNC
E2
SYNC
L2 4.7uHL2 4.7uH
U1
LTC3622EDE
U1
LTC3622EDE
VIN2
7
FB1 12
RUN2
9
FB2 10
INTVCC
11
SW2 8 SW1 14
RUN1
13
GND
15
ILIM
6
PGOOD2 5
PHASE
4
MODE/SYNC
3
VIN1
1PGOOD1 2
RSET1 619k 1% RSET1 619k 1%
E1
VIN1
2.7V - 17V
E1
VIN1
2.7V - 17V
JP4
PHASE
JP4
PHASE
1 2 3 4
RSET2 619k 1% RSET2 619k 1%
R7 0 R7 0
+
CIN1 22uF
35V
7343
+
CIN1 22uF
35V
7343
E12
GND
E12
GND
R6 0 0805 R6 0 0805
R13
137k
1% R13
137k
1%
JP1
ON OFF
RUN1
JP1
ON OFF
RUN1
1 3 2
JP13 3.3V JP13 3.3V
22pF CFF2 22pF CFF2
E4
PGOOD1
E4
PGOOD1
E3
INTVCC
3.6V
E3
INTVCC
3.6V
22pF CFF1 22pF CFF1
E9
GND
E9
GND
E5
VOUT1
E5
VOUT1
JP6 1.2V JP6 1.2V
E6
PGOOD2
E6
PGOOD2
R8 0 R8 0
47uF C1 1206 47uF C1 1206
RPG2 100k 1% RPG2 100k 1%
JP11 1.5V JP11 1.5V
R12 309k 1% R12 309k 1%
R1 619k 1% R1 619k 1%
R3
196k
1% R3
196k
1%
JP14 5V JP14 5V
E8
GND
E8
GND
E7
VOUT2
E7
VOUT2
47uF C2 1206 47uF C2 1206
R4 137k 1% R4 137k 1%
C3 OPT C3 OPT
10uF C6 25V 1206 10uF C6 25V 1206
JP7 1.8V JP7 1.8V
JP5
ILIM
1A
500mA
500mA CHAN 2 ONLY
JP5
ILIM
1A
500mA
500mA CHAN 2 ONLY
1 2 3 4 5 6
C4 OPT C4 OPT
E11
VIN2
2.7V - 17V
E11
VIN2
2.7V - 17V
10uF C5 25V 1206 10uF C5 25V 1206
JP8 2.5V JP8 2.5V
JP12 1.8V JP12 1.8V
E10
GND
E10
GND
JP2
RUN2
ON OFF
JP2
RUN2
ON OFF
1 3 2
R5 OPT R5 OPT
L1 3.3uHL1 3.3uH
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DEMO MANUAL DC2003A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2014
LT 0714 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LT C ) provides the enclosed product(s) under the following AS IS conditions:
This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT
OR EVALUATION PURPOSES ONLY and is not provided by LT C 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 LT C 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.
LT C 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 LT C applica-
tion engineer.
Mailing Address:
Linear Technology
1630 McCarthy Blvd.
Milpitas, CA 95035
Copyright © 2004, Linear Technology Corporation
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