Linear Technology DC1477B Quick setup guide

1
dc1477bfa
DEMO MANUAL DC1477B
Description
LTM4609EV: 36VIN, 34VOUT
Buck-Boost DC/DC
µModule
®
Regulator
Demonstration circuit DC1477B features the LT M
®
4609EV,
the high voltage, high efficiency, high density switch mode
buck-boost power module. The LTM4609EV regulates
an output voltage above, below, or equal to the input
voltage. DC1477B accepts an input voltage from 10V
to 36V with a preset output voltage of 30V at up to 3A.
Derating may be necessary for certain VIN, VOUT, and
thermal conditions. An optional input π filter is added on
the DC1477B to minimize the input ripple. The switching
frequency may be synchronized to an external clock from
L, LT, LTC, LTM, µModule, 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
200kHz to 400kHz to reduce undesirable frequency har-
monics and/or parallel multiple modules for even higher
output current. The LTM4609 data sheet must be read in
conjunction with this demo manual prior to working on
or modifying demo circuit DC1477B.
Design files for this circuit board are available at
http://www.linear.com/demo/DC1477B
(TA= 25°C)
PARAMETER CONDITIONS VALUE
Minimum Input Voltage 10V to 36V
Output Voltage VOUT 30V ± 2%
Maximum Continuous Output Current Derating is Necessary for Certain VIN, VOUT, and Thermal
Conditions
3ADC at 10VIN
8ADC at 24VIN
10ADC at VIN > 30V
Default Operating Frequency 300kHz
Efficiency VIN = 20V, VOUT = 30V, IOUT = 3A 96.7%, See Figure 3 for More Information

2
dc1477bfa
DEMO MANUAL DC1477B
Quick start proceDure
Demonstration circuit DC1477B is an easy way to evalu-
ate the performance of the LTM4609EV. 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
30VOUT application:
RUN CLOCK MODE START
ON PROG CCM SSO
2. With the power supply off, connect the input power
supply, load and meters as shown in Figure 1. Preset
the load to 0A and VIN supply between 10V to 36V.
3. Turn on the power at the input. The output voltage
should be 30V ± 2%.
4. Once the proper output voltage is established, adjust the
load within the operating range and observe the output
voltage regulation, ripple voltage, efficiency and other
parameters. A cooling fan and heat sink are necessary
for VIN <10V and IOUT = 3A.
5. To measure input and output ripple, please refer to
Figure 2 for proper setup.
6. To adjust the switching frequency turn off the power
supply and modify R6 and R7. Do not allow voltage at
pin PLLFLTR to exceed 2.4V.
7. Inductor and RSENSE should be modified to accom-
modate certain input and output condition. Refer to
the data sheet for details.
8. The input filter formed by CIN2, L2 and L3, CIN3 and
CIN4 is for the purpose of reducing the input voltage
ripple. The magnetic beads L2 and L3 are not necessary,
but they help to reduce the high frequency ringings on
the input supply significantly. See Figure 5 for details.
9. The optional components Rsnb1 and Csnb1, Rsnb2 and
Csnb2 can be used to form RC snubber circuits on the
switching nodes, which may help to reduce the output
ripple. Refer to the data sheet for details.

3
dc1477bfa
DEMO MANUAL DC1477B
Quick start proceDure
Figure 1. Test Setup of DC1477B
Figure 2. Proper Scope Probe Placement for Measuring Input or Output Ripple
+–
+–
–
+
LOAD
0 TO 3A
VIN
–
+
– +
INPUT OR OUTPUT CAPACITOR

4
dc1477bfa
DEMO MANUAL DC1477B
Quick start proceDure
LOAD CURRENT (A)
DC1477B/LTM4609 EFFICIENCY AT 10VIN Input
0
100
90
80
70
60
50
0.5 1 1.5 2 2.5 3
EFFICIENCY (%)
DCM
BURST
CCM
LOAD CURRENT (A)
DC1477B/LTM4609 EFFICIENCY AT 20VIN Input
0
100
90
80
70
60
50
0.5 1 1.5 2 2.5 3
EFFICIENCY (%)
DCM
BURST
CCM
LOAD CURRENT (A)
DC1477B/LTM4609 EFFICIENCY AT 30VIN Input
0
100
90
80
70
60
50
0.5 1 1.5 2 2.5 3
EFFICIENCY (%)
DCM
BURST
CCM
LOAD CURRENT (A)
DC1477B/LTM4609 EFFICIENCY AT 36VIN Input
0
100
90
80
70
60
50
0.5 1 1.5 2 2.5 3
EFFICIENCY (%)
DCM
PS
CCM
Figure 3. Measured Efficiency at Different VIN

5
dc1477bfa
DEMO MANUAL DC1477B
Quick start proceDure
Figure 4. Measured Load Transient Response (1.5A Step, 50% to 100%)
Figure 5. Input Voltage Ripple Measured at CIN1 with 300MHz BW Probe, with and without the Input Filter
VOUT (500mV/DIV)
IOUT STEP (1A/DIV)
VIN = 10V, VOUT = 30V, CCM MODE
1.5A to 3A LOAD STEP
COUT = 2 ×10µF CERAMIC + 2 ×100µF ALUM
VOUT (200mV/DIV)
IOUT STEP (1A/DIV)
VIN = 36V, VOUT = 30V, CCM MODE
1.5A to 3A LOAD STEP
COUT = 2 ×10µF CERAMIC + 2 ×100µF ALUM
VIN (1V/DIV)
SW2 (10V/DIV)
SW1 (20V/DIV)
VIN = 10V, VOUT = 30V, IOUT = 3A
W/O INPUT FILTER: SHORT L2 AND L3, REMOVE CIN2
VIN = PEAK-TO-PEAK RIPPLE = 2.78V
VIN (1V/DIV)
SW2 (10V/DIV)
SW1 (20V/DIV)
VIN = 10V, VOUT = 30V, IOUT = 3A
W/ INPUT FILTER: STUFF L2, L3, AND CIN2
VIN PEAK-TO-PEAK RIPPLE = 0.47V

6
dc1477bfa
DEMO MANUAL DC1477B
parts List
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 1 CSS CAP., 0.1µF, X7R, 25V, 10%, 0603 AVX, 06033C104KAT2A
2 1 CIN1 CAP., ALUM. ELECT., 100µF, 50V, 20%, ME -WX
SERIES, THROUGH-HOLE, STRAIGHT-PIN
SUN ELECTRONIC INDUSTRIES CORPORATION,
50ME100WX+TS
3 2 CO3, CO4 CAP., 10µF, X7R, 35V, 10%, 1210 MURATA, GRM32ER7YA106KA12L
4 3 CIN2, CIN3, CIN4 CAP., X7R, 4.7µF, 50V, 10%, 1206 TAIYO YUDEN, UMK316BJ475KL-T
5 2 CO5, CO6 CAP., ALUM., 100µF, 35V, 20%, HVH SERIES SUN ELECTRONIC INDUSTRIES CORPORATION,
35HVH100M
6 1 L1 IND., POWER, 3.3µH, 20%, IHLP-5050FD-01 VISHAY, IHLP5050FDER3R3M01
7 1 R1 RES., 100kΩ, 5%, 1/10W, 0603 VISHAY, CRCW0603100KJNEA
8 1 R5 RES., 2.74kΩ, 1%, 1/10W, 0603 VISHAY, CRCW06032K74FKEA
9 1 R6 RES., 4.64kΩ, 1%, 1/10W, 0603 VISHAY, CRCW06034K64FKEA
10 1 R7 RES., 1.21kΩ, 1%, 1/10W, 0603 VISHAY, CRCW06031K21FKEA
11 2 RS1, RS2 RES., PWR. METAL STRIP, 0.015Ω, 1%, 1/4W, 1206 VISHAY, WSL1206R0150FEA
12 1 U1 I.C., HIGH DENSITY, HIGH OUTPUT BUCK-BOOST
µModule, 15mm × 15mm × 2.82mm, LGA
LINEAR TECH., LTM4609EV#PBF
Additional Demo Board Circuit Components
1 0 CIN5, Csnb1, Csnb2, C07
(OPT)
CAP., OPTION, 1206 OPT.
2 0 C2, C4, C5, CP, CFF (OPT) CAP., OPTION, 0603 O P T.
3 0 CO1, CO2, CO8 (OPT) CAP., OPTION, D3L O P T.
4 2 D1, D2 DIODE, ZENER, 4.7V, 5%, 250mW, SOD-323 CENTRAL SEMI., CMDZ5230B TR LEAD FREE
5 2 L2, L3 IND., HIGH CURRENT, 50Ω, 25%, 6A, 1806 FAIR-RITE PRODUCTS CORP., 2518065007Y6
6 1 R2 RES., 51kΩ, 5%, 1/10W, 0603 VISHAY, CRCW060351K0JNEA
7 1 R8 RES., 20kΩ, 1%, 1/10W, 0603 VISHAY, CRCW060320K0FKEA
8 0 RS3, Rsnb1, Rsnb2 (OPT) RES., OPTION, 1206 O P T.
9 0 R9, RUVLO (OPT) RES., OPTION, 0603 O P T.
Hardware-For Demo Board Only
1 2 JP1, JP2 CONN., HEADER, 1×3, 2mm SAMTEC, TMM-103-02-L-S
2 2 JP3, JP4 CONN., HEADER, 1×4, 2mm SAMTEC, TMM-104-02-L-S
3 4 JP1, JP2, JP3, JP4 SHUNT, 2mm SAMTEC, 2SN-BK-G
4 10 TP1, TP4, TP5, TP7, TP9,
TP11-TP15
TEST POINT, TURRET
, 0.094" MTG. HOLE MILL-MAX, 2501-2-00-80-00-00-07-0
5 4 TP2, TP3, TP8, TP10 CONN., JACK, BANANA, NON-INSULATED, 0.218" KEYSTONE, 575-4
6 4 MH1, MH2, MH3, MH4 STANDOFF, NYLON, SNAP-ON, 0.500" KEYSTONE, 8833 (SNAP ON)

7
dc1477bfa
DEMO MANUAL DC1477B
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
A
A
B
B
A
A
B
B
3A MAX
RUN
ON
OFF
DCM CCM
(BURST / PULSE SKIP) PS
OFF
SSO (SOFT START ON)
LO (LDO ON)
EXT
PROG
CLOCK
30V
MODE
Derating Necessary for Certain Input
and Output Voltages.
*
START
DCM
SOFT START ON
LDO ON
OFF
MODE
OFF
SSO
BURST/
LO
START
CCMCCM DCM
*
SKIP_CYCLE
**
*
*
10V - 36V
50V50V
LTM4609EV
PS
50V
VSS
VIN
INTVCC
VOUT
VIN1
INTVCC
VIN1
INTVCC
VIN1
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
SAM Y.
PRODUCTION
110-31-11
1
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
SAM Y.
PRODUCTION
110-31-11
1
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
SAM Y.
PRODUCTION
110-31-11
1
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035
Phone: [phone]
1630 McCarthy Blvd. LTC Condential-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 T O
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 AN D
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
Monday, January 23, 2012
1 1
High Density, High Output Buck-Boost Power uModule
HZ
SAM Y.
B
LTM4609EV DEMO CIRCUIT 1477B
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035
Phone: [phone]
1630 McCarthy Blvd. LTC Condential-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 T O
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 AN D
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
Monday, January 23, 2012
1 1
High Density, High Output Buck-Boost Power uModule
HZ
SAM Y.
B
LTM4609EV DEMO CIRCUIT 1477B
SIZE DATE:
IC NO. REV.
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: [phone]
Milpitas, CA 95035
Phone: [phone]
1630 McCarthy Blvd. LTC Condential-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 T O
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 AN D
SCHEMATIC
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
SCALE = NONE
www.linear.com
1
Monday, January 23, 2012
1 1
High Density, High Output Buck-Boost Power uModule
HZ
SAM Y.
B
LTM4609EV DEMO CIRCUIT 1477B
L2 0.4uHL2 0.4uH
TP15
INTVCC TP15 INTVCC
C5
(OPT)
C5
(OPT)
TP11 VO- TP11 VO-
RS3
(OPT)
RS3
(OPT)
TP3
VIN- TP3 VIN- R9
(OPT)
1%
R9
(OPT)
1%
JP1JP1
1
2
3
Cin2
4.7uF
Cin2
4.7uF
CP
(OPT)
CP
(OPT)
Cin4
4.7uF
Cin4
4.7uF
L1 3.3uH L1 3.3uH
RS1
0.015
RS1
0.015
U1U1
VIN
L12
VIN
K11
VIN
J10
VIN
M10
VIN
L11VIN L10VIN
K12
VIN
J11
VIN
J12
VIN
K10
GND
C11
GND
C10
GND
C9
GND
C8
GND
C7
GND
C5
GND
C4
GND
C3
GND
C2
GND
C1
GND
B4
GND
B3
GND
B2
GND
C6
GND
B1
GND
A3
GND
A2
GND
A1
VOUT G2
VOUT G3
VOUT G4
VOUT H1
VOUT H2
VOUT H3
VOUT H4
COMP
B7
EXTVCC
F6
SS
A6
RSENSE G5
GND
C12 GND
D1 GND
D2 GND
D3 GND
D4
GND
D9
GND
D8
GND
D7
GND
D6
GND
D5
GND
D10
VFB B6
SW1 J1
SW2 J8
VOUT G1
VOUT E2 VOUT E1
VIN
M11
VIN
M12
INTVCC
F5
PGOOD
B5
RUN
A8
PLLFLTR
B8
PLLIN
B9
FCB
A9
STNDBY
A10
SGND
A7
GND
D11 GND
D12 GND
E3 GND
E4 GND
E5 GND
E6 GND
E7 GND
E8 GND
E9 GND
E10 GND
E11 GND
E12
GND
A11 GND
A12
GND
B10 GND
B11 GND
B12
SENSE+A4
SENSE-A5
RSENSE G6
RSENSE G7 RSENSE G8 RSENSE G9 RSENSE G10 RSENSE G11 RSENSE G12 RSENSE H5 RSENSE H6 RSENSE H7 RSENSE H8 RSENSE H9 RSENSE H10 RSENSE H11
RSENSE H12
RSENSE J5 RSENSE J6 RSENSE J7 RSENSE K5 RSENSE K6
RSENSE L5 RSENSE L6 RSENSE M5 RSENSE M6 RSENSE F10 RSENSE F11 RSENSE F12
VOUT F1 VOUT F2 VOUT F3
VOUT F4
SW1 J2
SW1 J3
SW1 J4
SW1 K1
SW1 K2
SW1 K3
SW1 K4
SW1 L1
SW1 L2
SW1 L3
SW1 L4
SW1 M1
SW1 M2
SW1 M3
SW1 M4
SW2 J9
SW2 K7
SW2 K8
SW2 K9
SW2 L7
SW2 L8
SW2 L9
SW2 M7
SW2 M8
SW2 M9
NC F8
NC F9
NC F7
RUVLO
(OPT)
RUVLO
(OPT)
+
Cin1 50V
100uF
+
Cin1 50V
100uF
RS2
0.015
RS2
0.015
CFF
(OPT)
CFF
(OPT)
Csnb2 (OPT)Csnb2 (OPT)
R7
1.21K
R7
1.21K
TP7 VO+ TP7 VO+
CO5
100uF
35V
CO5
100uF
35V
R2
51K
R2
51K
TP9
EXTVCC TP9 EXTVCC
JP4JP4
1
2 3
4
Cin5
(OPT)
Cin5
(OPT)
TP1
VIN TP1 VIN
CO3
10uF
35V CO3
10uF
35V
D2
CMDZ5230B
D2
CMDZ5230B
2 1
TP13
SGND TP13 SGND
L3 0.4uHL3 0.4uH
CO7
(OPT)
35V
CO7
(OPT)
35V
R5
2.74K
1%
R5
2.74K
1%
TP2
VIN+ TP2 VIN+
Rsnb1 (OPT)Rsnb1 (OPT)
TP5
PGOODTP5 PGOOD
TP4
GND TP4 GND
TP12
SOFT START TP12 SOFT START
CO4
10uF
35V
CO4
10uF
35V
CO8
(OPT)
CO8
(OPT)
JP3JP3
1
2 3
4
TP14
EXT. CLOCK TP14 EXT. CLOCK
Cin3
4.7uF
Cin3
4.7uF
CSS 0.1uF CSS 0.1uF
JP2JP2
1
2
3
TP10
GND
TP10
GND
CO2
(OPT)
CO2
(OPT)
C2 (OPT)C2 (OPT)
TP8 VOUT TP8 VOUT
R8 20KR8 20K
C4 (OPT)C4 (OPT)
Csnb1 (OPT)Csnb1 (OPT)
R1
100K
R1
100K
CO1
(OPT)
CO1
(OPT)
R6 4.64KR6 4.64K
Rsnb2 (OPT)Rsnb2 (OPT)
CO6
100uF
35V
CO6
100uF
35V
D1
CMDZ5230B
D1
CMDZ5230B
2 1

8
dc1477bfa
DEMO MANUAL DC1477B
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2012
LT 0415 REV A • 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

Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
Analog Devices Inc.:
DC1477B