Linear Technology DC1588A Quick setup guide

1
dc1588af
DEMO MANUAL DC1588A
DESCRIPTION
LTM4611EV:
Ultralow VIN 15A Step-Down
Power µModule
®
Regulator
Demonstration circuit DC1588A features the LTM
®
4611EV,
a low input voltage 15A step-down power module. The
operating input voltage range is 1.5V to 5.5V with an out-
put voltage range from 0.8V to 5V. DC1588A can support
a load current up to 15A, while derating may be neces-
sary for different VIN, VOUT and thermal conditions. The
LTM4611EV can operate in pulse-skipping mode or Burst
Mode
®
operation for high efficiency under a light load. The
DC1588A has a defaultprogrammable switching frequency
of 500kHz and may be synchronized to an external clock
from 360kHz up to 710kHz. The TRACK/SS input allows
the output voltage to ramp up and ramp down; coinciden-
tally or ratiometrically with an external voltage. A remote
L, LT, LTC, LTM, μModule, Burst Mode, Linear Technology and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
PERFORMANCE SUMMARY
BOARD PHOTO
output voltage sense feature improves the output voltage
accuracy under high loads. These features and the avail-
ability of the LTM4611EV in a compact 15mm ×15mm
×4.32mm LGA package make the demonstration circuit
ideal for use in many high density point-of-load regula-
tion applications. The LTM4611 data sheet must be read
in conjunction with this demo manual for working on or
modifying the demo circuit 1588A.
Design files for this circuit board are available at
http://www.linear.com/demo
(TA= 25°C)
PARAMETER CONDITIONS VALUE
Input Voltage Range 1.5V to 5.5V
Output Voltage VOUT Selectable with Jumpers (Open for 0.8V) 0.8V, 1.0V, 1.2V, 1.5V, 1.8V, 2.5V, 3.3V
Maximum Continuous Output Current Derating is Necessary for Certain Operating Conditions.
See Data Sheet for Details
15A DC
Default Operating Frequency 500kHz
External Clock Synchronous Frequency Range 360kHz to 710kHz
Efficiency VIN = 5V, VOUT = 3.3V, IOUT = 15A 93%, See Figure 2

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dc1588af
DEMO MANUAL DC1588A
QUICK START PROCEDURE
Figure 1. Test Setup of DC1588A
Demonstration circuit 1588A is easy to set up to evalu-
ate the performance of the LTM4611EV. Please refer to
Figure1 for proper measurement equipment setup and
follow the procedure below:
1. Place jumpers in the following positions for a typical
1.8VOUT application:
JP4 JP1 JP2 JP3
VOUT SELECT RUN MODE/PLLIN TRACK/SS
1.8V ON FCM SS
2. With power off, connect the input power supply, load
and meters as shown in Figure 1. Preset the load to
0A and VIN supply to be 5V.
3. Turn on the power supply at the input. The output volt-
age should be 1.8V ± 1.5%.
4. Oncethe properoutput voltageis established,adjust the
load within the operating range and observe the output
voltage regulation, output voltage ripple, efficiency and
other parameters. Output ripple should be measured
at J5 with a BNC cable.
5. To perform a load transient test, apply a square-wave
pulse signal between IOSTEP_CLK and GND pins. The
pulse amplitude (3V ~ 3.5V) sets the amplitude of load
current step. The pulse signal should have very small
duty cycle (<10%) to limit the thermal stress on the
transient load circuit. The output transient current can
be monitored at BNC connector J6 (15mV/A).
6. The LTM4611 can be synchronized to an external clock
signal. Place the jumper JP2 in the EXTCLK position
and apply the clock signal on the “CLKIN” (TP17) test
point.
7. The output of LTM4611 can track another supply. The
jumper JP3 allows selection of the soft-start or output
tracking feature. If tracking external voltage is selected,
the corresponding test point, “TRACK” (TP7), needs to
be connected to a valid reference voltage signal.
+
VIN
1.5V TO 5.5V
A
+
–
V
–
+
V
–
+
A
–
+
LOAD
0A TO 15A
DC1588A F01

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dc1588af
DEMO MANUAL DC1588A
QUICK START PROCEDURE
Efficiency vs Load Current at 3.3VIN,
Forced Continuous Mode
Efficiency vs Load Current at 5VIN,
Forced Continuous Mode
OUTPUT CURRENT (A)
0
EFFICIENCY (%)
85
90
12
DC1588A F03a
80
75 36915
95
2.5VOUT
1.8VOUT
1.5VOUT
1.2VOUT
1.0VOUT
0.9VOUT
0.8VOUT
OUTPUT CURRENT (A)
0
EFFICIENCY (%)
85
90
12
DC1588A F03b
80
75 36915
95
3.3VOUT
2.5VOUT
1.8VOUT
1.5VOUT
1.2VOUT
1.0VOUT
0.9VOUT
0.8VOUT
Figure 2. Measured Supply Efficiency with Different VIN and VOUT
Figure 3. Measured Load Transient Response (0A to 7A Step)
VOUT
50mV/DIV
IOUT
6.5A/DIV
50μs/DIV DC1588 F04
VIN = 5V
VOUT = 1.5V
0A TO 7A LOAD STEP
COUT = 4 w100μF CERAMIC, C7 = 0.1μF

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dc1588af
DEMO MANUAL DC1588A
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 CIN1 CAP, 120μF 20% 16V OS-CON SANYO OS-CON 16SVP120M
2 2 CIN3, CIN4 CAP, 1210 47μF 20% 16V X5R TAIYO YUDEN EMK325BJ476MM-T
3 4 CO2, CO3, CO4, CO6 CAP, 1210 100μF 20% 6.3V X5R AVX 12106D107MAT2A
4 2 R9, R10 RES, 0603 10Ω 5% 1/10W VISHAY CRCW060310R0JNEA
5 1 R5 RES, 0603 48.7k 1% 1/10W VISHAY CRCW060348K7FKEA
6 1 C2 CAP, 0603 47pF 10% 50V NPO AVX 06035A470KAT
7 1 U1 IC, HIGH EFFICIENCY STEP-DOWN MODULE LINEAR TECH.LTM4611EV
Additional Demo Board Circuit Components
1 0 CIN2 CAP, 1210 22μF 20% 16V X5R OPTION TDK C3225X5R1C226M OPTION
2 0 CO1 CAP, 7343 330μF 20% 4V POSCAP OPTION SANYO POSCAP 4TPE330MI OPTION
3 0 CO5 CAP, 1210 100μF 20% 6.3V X5R OPTION AVX 12106D107MAT2A OPTION
4 0 C1 CAP, 0603 220pF 10% 50V NPO OPTION AVX 06035A221KAT OPTION
5 1 C3 CAP, 0603 4.7μF 20% 10V X5R TAIYO YUDEN LMK107BJ475MA-T
6 0 C4,C6 CAP, 0603 OPTION OPTION
7 1 C5 CAP, 0603 10nF 10% 50V X7R TDK C1608X7R1H103K
8 1 C7 CAP, 0603 0.1μF 20% 16V X7R TAIYO YUDEN EMK107BJ104MA-T
9 0 C8 CAP, 0805 OPTION OPTION
10 0 D1 DIODE, ZENER 350mW OPTION DIODES INC. BZX84C5V6 OPTION
11 1 Q1 XSTR, MOSFET VISHAY SILICONIX SUD50N03-09P-E3
12 1 RS1 RES, 2512 0.015Ω 1% 1W PANASONIC ERJM1WSF15MU
13 0 R1,R13-R15, R18, R21, R23 RES, 0603 OPTION OPTION
14 1 R2 RES, 0603 243k 1% 1/10W VISHAY CRCW0603243KFKEA
15 1 R3 RES, 0603 121k 1% 1/10W VISHAY CRCW0603121KFKEA
16 1 R4 RES, 0603 69.8k 1% 1/10W VISHAY CRCW060369K8FKEA
17 1 R6 RES, 0603 28.7k 1% 1/10W VISHAY CRCW060328K7FKEA
18 1 R7 RES, 0603 19.1k 1% 1/10W VISHAY CRCW060319K1FKEA
19 2 R11, R12 RES, 0603 10k 5% 1/10W VISHAY CRCW060310K0JNEA
20 1 R17 RES, 0603 60.4k 1% 1/10W VISHAY CRCW060360K4FKEA
21 1 R19 RES, 0603 100k 5% 1/10W VISHAY CRCW0603100KJNEA
22 1 R22 RES, 0603 0Ω JUMPER VISHAY CRCW06030000Z0EA
Hardware
1 2 JP1, JP3 HEADER, 3 PIN, 2mm SAMTEC TMM-103-02-L-S
2 1 JP2 HEADER, 2MM DOUBLE R0W, 2X4 SAMTEC TMM-104-02-L-D
3 1 JP4 HEADER, 2MM DOUBLE R0W, 2X7 SAMTEC TMM-107-02-L-D
4 4 J1, J2, J3, J4 JACK, BANANA KEYSTONE 575-4
5 2 J5, J6 CONN, BNC, 5 PINS CONNEX 112404
6 5 TP1, TP2, TP3, TP4, TP8 TURRET MILL MAX 2501-2-00-80-00-00-07-0
7 5 TP5, TP7, TP13, TP14, TP17 TURRET MILL MAX 2308-2-00-80-00-00-07-0
8 4 XJP1, XJP2, XJP3, XJP4 SHUNT, 2mm SAMTEC 2SN-BK-G
9 4 STANDOFF, SNAP ON KEYSTONE_8834

5
dc1588af
DEMO MANUAL DC1588A
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 representation
that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAMS
BURST MODE FCM
1 3 2
VIN
GND
VIN+
VIN-
VO+
VOUT
GND
VO-
0.8V - 3.3V
2.5V1.0V 1.2V 1.8V1.5V
VOUT SELECT
1.5V - 5.5V
SGND
PULSE_SKIP
0.8V
PGOOD
@15A
CLKIN
SHT 1 SHT 1
SHT 1 SHT 1
3.3V
DYNAMIC LOAD CIRCUIT
IOSTEP
IOSTEP_CLK
VOUT
RUN
2
SS
1
TRACK
TRACK/SS
3
TRACK
ON
OFF
VOUT < VIN
RUN
T
TT T
16V 1210 1210 1210
1210 1210 1210
1210 1210
VO+
EXTCLK
VOUT
VO-
VO+ VO-
VIN
RUN
VIN
INTVCC
INTVCC
INTVCC
VIN
VOUT
VOUT
VIN
INTVCC
RUN
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
JEFF Z.
PRODUCTION
205/13/10
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
JEFF Z.
PRODUCTION
205/13/10
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
JEFF Z.
PRODUCTION
205/13/10
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LTM4611EV
DEMO CIRCUIT 1588A
STEP-DOWN POWER MODULE
R
R17 60.4KR17 60.4K
J5J5
1
2
3
4
5
CO2
100uF
6.3V CO2
100uF
6.3V
C3 4.7uF C3 4.7uF
+
CIN1 120uF
+
CIN1 120uF
12
CIN2 OPT 16V CIN2 OPT 16V
CO5
OPT
CO5
OPT
C7 0.1uF C7 0.1uF R7 1% 19.1K R7 1% 19.1K
TP14TP14
C4
OPT
C4
OPT
U1 LTM4611EV U1 LTM4611EV
VIN A1
VIN A2
VIN A3
VIN A4
VIN A5
VIN A6
VIN B1
VIN B2
VIN B3
VIN B4
VIN B5
VIN B6
VIN C1
VIN C2
VIN C3
VOSNS+ J12
VOSNS- M12
SGND
H11
SGND
H12
PGND
B7
PGND
B9
PGND
C7
PGND
C9
PGND
D1
PGND
D2
PGND
D3
PGND
D4
PGND
D5
PGND
D6
PGND
E1
PGND
E2
PGND
E3
PGND
E4
PGND
E5
PGND
E6
PGND
E7
PGND
F1
PGND
F2
PGND
F3
PGND
F4
PGND
F5
PGND
F6
PGND
F7
PGND
F9
PGND
G1
PGND
G2
PGND
G3
PGND
G4
PGND
G5
PGND
G6
PGND
G7
PGND
F8
PGND
G8
PGND
G9
PGND
H1
PGND
H2
PGND
H7 PGND
H6
RUN
A10
TRACK/SS
A9
MODE/PLLIN
A8
PGND
H8
SGND
G11
VOUT L10 VOUT L9 VOUT L7 VOUT L6 VOUT L5 VOUT L4 VOUT L3 VOUT L2 VOUT L1
VOUT K11
VOUT K10
VOUT K9
VOUT K8
VOUT K7
VOUT K6
VOUT K5
VOUT K4
VOUT K3
VOUT K2
VOUT K1
VOUT J10
VOUT J9
VOUT J8
VOUT J7
VOUT J6
VOUT J5
VOUT J4
VOUT J3
VOUT J2
VIN C6
VIN C5
VIN C4
VOUT J1
INTVCC
A7
INTVCC
D9
FSET
B12
COMP
A11
DIFF_VOUT K12
VOUT_LCL L12
VFB F12
VOUT L11 VOUT M1 VOUT M2 VOUT M3 VOUT M4 VOUT M5 VOUT M6 VOUT M7 VOUT M8 VOUT M9 VOUT M10 VOUT M11
PGND
H9
PGND
H3
PGND
H4
PGND
H5
VOUT L8
PGOOD
F11
PGOOD
G12
MTP1 A12 MTP2 B11
PGND
D8
PGND
E9
MTP3 C10 MTP4 C11 MTP5 C12 MTP6 D10 MTP7 D11 MTP8 D12 MTP9 E12
CO6
100uF
6.3V
CO6
100uF
6.3V
C8 OPT C8 OPT
CO3
100uF 6.3V
CO3
100uF 6.3V
JP2JP2
1 2 3 4 5 6 7 8
TP2TP2
R22 0R22 0
C1
OPT
C1
OPT
JP4JP4
1
2
3
4
5
6
7 8
9
10
11
12
13
14
TP4TP4
R18 OPT R18 OPT
JP3JP3
TP17TP17 TP1TP1
R2 1% 243K R2 1% 243K Q1 SUD50N03-09P-E3 Q1 SUD50N03-09P-E3
J6J6
1
2
3
4
5
R3 1% 121K R3 1% 121K
R10 10 R10 10
CO4
100uF
6.3V
CO4
100uF
6.3V
J1J1
RS1 0.015 1% RS1 0.015 1%
TP3TP3
C6
OPT
C6
OPT
D1 OPT D1 OPT
R12 10k R12 10k
R19 100K R19 100K
J2J2
R21 OPT R21 OPT
CIN3 47uF 16V CIN3 47uF 16V
R15
OPT
R15
OPT
CIN4
47uF
16V
CIN4
47uF
16V
R11 10k R11 10k
R6 1% 28.7K R6 1% 28.7K
R9 10 R9 10
TP5TP5
TP7TP7
R5 1% 48.7K R5 1% 48.7K
R4 1% 69.8K R4 1% 69.8K
R13 OPT R13 OPT
R1 OPT R1 OPT
C2 47pF C2 47pF
JP1JP1
J3J3
TP13TP13
+
CO1 OPT
+
CO1 OPT
12
C5
10nF
C5
10nF
R23 OPT R23 OPT
J4J4
TP8TP8
R14 OPT R14 OPT

6
dc1588af
DEMO MANUAL DC1588A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2010
LT 1010 • 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 direc-
tive 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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