Linear Technology DC1818A Quick setup guide

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DEMO MANUAL DC1818A
DESCRIPTION
LTM8001
36VIN, 5A µModule Regulator with
5-Output Configurable LDO Array
Democircuit1818AfeaturestheLTM8001Moduleregula-
tor that includes a 5A switching regulator and an array of
five 1.1A low noise LDOs. DC1818A is configured so the
switching regulator provides an output that also powers
the LDOs. The LDOs in turn provide three outputs – one
from a single LDO and two outputs each formed by paral-
leling two LDOs together.
DC1818Asupports changes to theLTM8001’s user adjust-
able features including the output voltage of the switching
regulator, output voltage ofeachofthe fiveLDOs,switching
frequency, soft-start period and output current limit of the L, LT, LTC, LTM, Linear Technology, the Linear logo and Module are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
switching regulator simply by modifying the appropriate
resistors or capacitor. DC1818A also supports all current
sharing or independent operation options of the LDOs.
DC1818A includes a BNC connector for noise measure-
ment of the LDO for VOUT1. An optional capacitor at C14
further reduces output noise.
The LTM8001 data sheet must be read in conjunction with
this demo manual to properly use or modify DC1818A.
Design files for this circuit board are available at
http://www.linear.com/demo
Specifications are at TA= 25°C
BOARD PHOTO
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DEMO MANUAL DC1818A
QUICK START PROCEDURE
Demo circuit 1818A is an easy way to evaluate the perfor-
mance of the LTM8001. Refer to Figure 1 for the proper
measurement equipment setup and follow the procedure
below:
NOTE: Do not hot-plug the VIN terminal at high input
voltages. The absolute maximum voltage on VIN is 40V
and hot-plugging a power supply through wire leads to
the demonstration circuit can cause the voltage on the
extremely low ESR ceramic input capacitor to ring to
twice its DC value. In order to protect the LTM8001, an
aluminum electrolytic capacitor with higher ESR is placed
at the input terminals. This may protect against some, but
not all, input transients due to a hot-plugged power supply.
See Application Note 88 for more details.
1. Place JP1 for BIAS123 in the INTERNAL 3.4V position.
NOTE:DC1818A includes an LTM8020 regulatorto provide
3.4V bias voltages to the LDOs. The 3.4V bias supply can
be disconnected using jumper JP1 to allow an external
bias supply.
2. Connect the power supply (with power off), loads, and
meters as shown in Figure 1.
3. After all connections are made, turn on the input power
and verify that VOUT0 is 1.8V and the output voltages for
VOUT1, VOUT2,3, and VOUT4,5 are 1.2V, 1.1V, and 0.9V
respectively.
NOTE: If VOUT0 is too low, temporarily disconnect the loads
to make sure that the loads are not set too high. If VOUT1,
VOUT2,3 or VOUT4,5 is too high, make sure the outputs are
loaded by at least the LDO minimum load current of 1mA,
2mA and 2mA respectively.
4. Once the proper output voltages are established, adjust
each load within its operating range and observe the
output voltage regulation, ripple voltage, efficiency and
other parameters.
PERFORMANCE SUMMARY
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Input Voltage, VIN 6V
Maximum Input Voltage, VIN 36 V
Regulator Output Voltage, VOUT0 IOUT0 ≤ 5A, IOUT1-5 = 0A, R9 = 19.6k 1.72 1.84 V
Maximum Regulator Output Current, IOUT0 ILIM = VREF, IOUT1-5 = 0A 5 A
LDO1 Output Voltage, VOUT1 1mA ≤ IOUT1 ≤ 700mA, R14 = 121k 1.16 1.25 V
LDO2,3 Output Voltage, VOUT2,3 VOUT2 = VOUT3, SET2 = SET3, 2mA ≤ IOUT2,3 ≤ 1.8A, R17 = 54.9k 1.04 1.13 V
LDO4,5 Output Voltage, VOUT4,5 VOUT4 = VOUT5, SET4 = SET5, 2mA ≤ IOUT4,5 ≤ 1.5A, R19 = 45.3k 0.86 0.94 V
VOUT0 Efficiency VIN = 12V, IOUT0 = 2.5A, IOUT1-5 = 0A 84 %
Switching Frequency R7 = 118k 350 kHz
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DEMO MANUAL DC1818A
Figure 1. Proper Measurement Equipment Setup
QUICK START PROCEDURE
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DEMO MANUAL DC1818A
QUICK START PROCEDURE
Figure 2. VOUT1 Noise Spectrum (VOUT1 = 1.2V at 700mA, COUT1 = 22μF, CSET1 = 1nF, VIN = 12V,
VOUT0 = 1.8V Loaded to a Total Current of 5A)
Figure 3. VOUT1 Ripple (VOUT1 = 1.2V at 700mA, COUT1 = 22μF, CSET1 = 1nF, VIN = 12V,
VOUT0 = 1.8V Loaded to a Total Current of 5A, 100MHz BW)
FREQUENCY (MHz)
0
INTENSITY (dBm)
0
–40
–60
–80
–20
–100
–120 2.5 4.51.5 3.5
dc1881a F02
5.02.0 4.01.0 3.00.5
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DEMO MANUAL DC1818A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 COUT1 CAP., POSCAP, 470µF, 4V, D3L SANYO, 4TPE470ML
2 1 C1 Cap., X5R, 10µF, 50V, 20% 1210 TAIYO YUDEN, UMK325BJ106M
3 1 C5 Cap., X7R, 1000pF, 50V, 20% 0603 AVX, 06035C102MAT2A
4 1 C8 Cap., X5R, 100µF, 6.3V, 20%, 1210 TAIYO YUDEN, JMK325ABJ107MM-T
5 5 C9-C13 Cap., X5R, 2.2µF, 10V, 10%, 0805 TAIYO YUDEN, LMK212BJ225KG-T
6 1 R7 RES., CHIP, 118k, 1%, 0603 VISHAY, CRCW0603118KFKEA
7 1 R9 RES., CHIP, 19.6k, 1%, 0402 VISHAY, CRCW040219K6FKED
8 1 R14 RES., CHIP, 121k, 1%, 0402 VISHAY, CRCW0402121KFKED
9 1 R17 RES., CHIP, 54.9k, 1%, 0402 VISHAY, CRCW040254K9FKED
10 1 R19 RES., CHIP, 45.3k, 1%, 0402 VISHAY, CRCW040245K3FKED
11 1 U1 IC, LTM8001EY, BGA, 15mmX15mmX3.42mm LINEAR TECH. LTM8001EY
Additional Demo Board Circuit Components
1 0 CIN1 CAP., ALUM, 100µF, 50V SUN ELECT, 50CE100LX
2 0 C2, C3 Cap., X5R, 1µF, 10V , 20% 0603 TAIYO YUDEN, LMK107BJ105MA-T
3 0 C4 Cap., X5R, 10µF, 50V, 20% 1210 TAIYO YUDEN, UMK325BJ106M
4 0 C6 Cap., X7R, 100pF, 25V, 10%, 0603 AVX, 06033C101KAT2A
5 0 C14 Cap., 0603
6 0 C15 Cap., X5R, 2.2µF, 50V, 20%, 1206 TAIYO YUDEN, UMK316BJ225MD-T
7 0 C16 Cap., X5R, 10µF, 6.3V, 10%, 1206 TAIYO YUDEN, JMK316BJ106KL-T
8 0 R1 RES., CHIP, 121k, 1%, 0603 VISHAY, CRCW0603121KFKEA
9 0 R2, R10, R20 RES., CHIP, 0, 1206 VISHAY, CRCW12060000Z0EA
10 0 R3 RES., CHIP, 107k, 1%, 0603 VISHAY, CRCW0603107KFKEA
11 0 R4 RES., CHIP, 174k, 1%, 0603 VISHAY, CRCW0603174KFKEA
12 0 R5 RES., CHIP, 100k, 5%, 0603 VISHAY, CRCW0603100KJNEA
13 0 R6, R11, R13 RES., CHIP, 0603
14 0 R8, R12, R16, R22 RES., CHIP, 0, 0603 VISHAY, CRCW06030000Z0EA
15 0 R15, R18 RES., CHIP, 0402
16 0 R21 RES., CHIP, 287k, 1%, 0603 VISHAY, CRCW0603287KFKED
17 0 U2 IC, LTM8020EV, LGA, 6.25mmx6.25x2.32mm LINEAR TECH. LTM8020EV
Hardware: For Demo Board Only
1 21 E1-E21 TESTPOINT, TURRET, 0.095" MILL-MAX, 2501-2-00-80-00-00-07-0
2 1 JP1 Header, 3 Pins 2mm Ctrs. SAMTEC, TMM-103-02-L-S
3 1 JP1 SHUNT SAMTEC, 2SN-BK-G
4 1 J1 CONN, BNC, 5 PINS C0NNEX, 112404
5 4 MH1-MH4 STAND-OFF, NYLON 0.5" Tall KEYSTONE, 8833 (SNAP ON)
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DEMO MANUAL DC1818A
SCHEMATIC DIAGRAM
E6
COMP
E3
RUN
E16 VOUT3 E11 VOUT0
1.2V 700mA
1.1V 1.8A
R7 118k
1206
50V
C6 100pF
0603
J1
1
2
3
4
5
R9 19.6k
C1
10uF
0402
R4 174k
BIAS123
R14
121k
C4 10uF
1210
10V
0402
R17
54.9k
R3 107k
10V
R6 (OPT)
0.9V 1.5A
50V
R2
0
E12 GND
VOUT1
10V
E5
BIAS45
2. ALL CAPACITORS ARE0805
4V
1210
C12 2.2uF
R15
(OPT)
0402
R19
45.3k
R10 0
10V
E19 VOUT5 E14 GND
350kHz
C14 (OPT)
R18
(OPT)
0603
U1
LTM8001EY
VIN0 J1
VOUT0 A3
VIN0 J2
VIN0 K1
VIN0 K2
VIN0 L1
VIN0 L2
RUN
L4
VIN45 A6
SS
K4
GND
A1
GND
A2
GND
B1
GND
B2
GND
B10 GND
B9
GND
C1
GND
C2
GND
D1
GND
C10 GND
C8
GND
C9
GND
D3 GND
D4 GND
D5 GND
D6 GND
D7 GND
D8 GND
D9
GND
E3 GND
E4 GND
E5 GND
E6 GND
E7 GND
E8 GND
E9
GND
F2 GND
F3 GND
F4 GND
F5 GND
F6 GND
F7 GND
F8 GND
F9
GND
G4 GND
G5 GND
G6 GND
G7 GND
G8 GND
G9 GND
G10 GND
H1
GND
H4 GND
H5 GND
H6 GND
H7 GND
H8 GND
H9 GND
H10
GND J9 GND J4 GND J5 GND J6 GND J7 GND J8 GND K5 GND K6 GND K10 GND K9
GND
D2
GND
D10 GND
E1 GND
E2
GND
E10 GND
F1
GND
F10 GND
G1
GND
G3 GND
G2
GND
H2 GND
H3
GND J10
VIN0 J3
VIN0 K3
VIN0 L3
BIAS123
B8
BIAS45
A8
COMP
L6
VREF
K8
ILIM
L8
RT
L7
SYNC
K7
VOUT0 A4
VOUT0 A5
VOUT0 B5
VOUT0 B4
VOUT0 B3
VOUT0 C3
VOUT0 C4
VOUT0 C5
VIN45 A7
VIN45 B6
VIN45 B7
VIN45 C6
VIN45 C7
VOUT1 L10 VOUT1 L11 VOUT2 J11 VOUT2 K11 VOUT3 E11 VOUT3 F11 VOUT4 B11 VOUT4 C11 VOUT5 A10 VOUT5 A11
FBO
L5
SET1 L9 SET2 H11 SET3 G11 SET4 D11 SET5 A9
10V
6V - 36V 1206
RUN
E17 GND
10V
C9 2.2uF
E20 GND
R13 (OPT)
R8 0
+
CIN1
100uF
C11 2.2uF
+
COUT1
470uF
E7
ILIM
6.3V
50V
E21 GND
VOUT1
C8
100uF
E9
GND
C10 2.2uF
NOTE: UNLESS OTHERWISE SPECIFIED
1. ALL RESISTORS ARE 0603 1%
0603
C13 2.2uF
C3 1uF
R11 (OPT)
E8
SYNC
10V
E1
VIN
R5 100k 5%
E10 VIN45 E13 VOUT1
R1
121k
E18 VOUT4
VIN
R12 0
C2 1uF
E2
GND
1.8V 1A
E15 VOUT2
R16 0
E4
BIAS123
C5 1nF
0603
1210
0402
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DEMO MANUAL DC1818A
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
VIN
BIAS123
RUN
U2
LTM8020EV
GND
C2
GND
D3 GND D4 GND D5 GND
E2 GND E3 GND E4 GND E5
GND
D2 GND D1
VOUT A4
VOUT A5
VOUT B5
VOUT B4
ADJ
E1
BIAS C3
VOUT C4
VOUT C5
SHDN
C1
VIN
A1
VIN
A2
6.3V
BIAS123
INTERNAL 3.4V
EXTERNAL
C15
2.2uF
1206
50V
R20 0
C16
10uF
R22 0
1206
R21
287k
JP1
1
2
3
1206
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DEMO MANUAL DC1818A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2013
LT 0213 • PRINTED IN USA
DEMONSTRATION BOARD IMPORTANT NOTICE
Linear Technology Corporation (LTC) 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 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. LTC 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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