Linear Technology DC1663A Quick setup guide

1
dc1663af
DEMO MANUAL DC1663A
DESCRIPTION
LTM4628EV High Efficiency,
Dual 8A Step-Down Power
µModule Regulator
BOARD PHOTO
Demonstration circuit DC1663A features the LTM
®
4628EV,
the high efficiency, high density, dual 8A output, switch
mode step-down power module. The input voltage is
from 4.5V to 26.5V. The output voltage is programmable
from 0.6V to 5.5V. Output current derating is necessary
for certain VIN, VOUT, and thermal conditions. The board
operates in continuous conduction mode in heavy load
conditions. For high efficiency at low load currents, the
MODE jumper (JP1) selects pulse-skipping mode for
noise sensitive applications or Burst Mode
®
operation
in less noise sensitive applications. The DC1663A sets
the LTM4628EV default switching frequency to 400kHz;
however the frequency is resistor programmable from
250kHz up to 780kHz. An internal phase-lock loop allows
the module to be synchronized to an external clock. The
board allows the user to program how its output ramps
up and down through the TRACK/SS pin. The output can
be set up to either coincidentally or ratio metrically track
with another supply’s output. Remote output voltage sens-
ing is available for improved output voltage regulation at
the load point. These features and the availability of the
LTM4628EV in a compact 15mm × 15mm × 4.32mm LGA
package make it ideal for use in many high density point
of load regulation applications. The LTM4628 datasheet
must be read in conjunction with this demo manual for
working on or modifying the demo circuit DC1663A.
Design files for this circuit board are available at
http://www.linear.com/demo
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.

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dc1663af
DEMO MANUAL DC1663A
QUICK START PROCEDURE
PERFORMANCE SUMMARY
Demonstration circuit DC1663A is easy to set up to evalu-
ate the performance of the LTM4628EV. Please refer to
Figure 1 for proper measurement equipment setup and
the following the procedure:
1. Place jumpers in the following positions for a typical
application:
JP1 JP2 JP3 JP4 JP5 JP6
MODE RUN1 RUN2 TRACK1
SEL.
TRACK2
SEL.
CLKOUT
PHASE
CCM ON ON SOFT-
START
SOFT-
START
60°
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 12V.
3. Turn on the power supply at the input. The output volt-
age in channel 1 should be 1.5V ± 1.5% and the output
voltage in channel 2 should be 1.2V ± 1.5%.
4. Once the proper output voltage is 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
J1 and J2 with SMA cables. 50Ω termination should
be set on the oscilloscope or SMA cables.
5. (Optional) For optional load transient test, apply an
adjustable pulse signal between IOSTEP CLK and GND
pins. Pulse amplitude (3V to 3.5V) sets the load step
current amplitude. 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 the SMA connector J3 (15mV/A).
Apply the jumper resistors R34 or R35 (on the back-
side of boards) to apply load transient on channel 1 or
channel 2 correspondingly.
6. (Optional) LTM4628 can be synchronized to an external
clock signal. Remove the jumper on JP1 and apply a clock
signal (0V to 5V, square wave) on the CLKIN test point.
7. (Optional) The outputs of LTM4628 can track another
supply. The jumpers JP4 and JP5 allow choosing soft-
start or output tracking. If tracking external voltage
is selected, the corresponding test points, TRACK1
and TRACK2, need to be connected to a valid voltage
signal.
8. (Optional) LTM4628 can be configured for a 2-phase
single output at up to 16A on DC1663A. Refer to the
schematic for corresponding jumper resistor setup for
dual phase single output applications.
PARAMETER CONDITION VALUE
Input Voltage Range 4.5V to 26.5V
Output Voltage VOUT1 VIN = 4.5 to 26.5V, IOUT1 = 0A to 8A, JP1: CCM 1.5V ± 1.5% (1.4775V to 1.5225V)
Output Voltage VOUT2 VIN = 4.5 to 26.5V, IOUT2 = 0A to 8A, JP1: CCM 1.2V ± 1.5% (1.182V to 1.218V)
Per Channel Maximum Continuous Output Current Derating is Necessary for Certain VIN, VOUT and
Thermal Conditions, See Datasheet for Details.
8A
Default Operating Frequency 400kHz
External Clock Synchronous Frequency Range 400kHz to 780kHz
Efficiency of Channel 1 VIN = 5V, VOUT1 = 1.5V, IOUT1 = 8A, fSW = 400 kHz 87.7% See Figure 2
Efficiency of Channel 2 VIN = 5V, VOUT2 = 1.2V, IOUT2 = 8A, fSW = 400 kHz 85.5% See Figure 3
Load Transient of Channel 1 VIN = 12V, VOUT1 = 1.5V, ISETP = 0A to 4A See Figure 4
Load Transient of Channel 2 VIN = 12V, VOUT2 = 1.2V, ISETP = 0A to 4A See Figure 5
(TA= 25°C)

3
dc1663af
DEMO MANUAL DC1663A
QUICK START PROCEDURE
Figure 1. Test Setup of DC1663A
–
–
+
+
+–
V
+–
V
+
–
V
A
+ –
A
VIN
4.5V TO 26.5V
LOAD 0A TO 8A
+– A
LOAD 0A TO 8A
1663a F01
VOUT1 VOUT2

4
dc1663af
DEMO MANUAL DC1663A
QUICK START PROCEDURE
Figure 2. Measured Efficiency on Channel 1
(VOUT1 = 1.5V, fSW = 400kHz, Channel 2 Disabled)
Figure 4. Measured Channel 1 Load Transient
(VIN = 12V, VOUT1 = 1.5V)
Figure 3. Measured Efficiency on Channel 2
(VOUT2 = 1.2V, fSW = 400kHz, Channel 1 Disabled)
Figure 5. Measured Channel 2 Load Transient
(VIN = 12V, VOUT2 = 1.2V)
1663 F04
VOUT1
AC-COUPLED
20MHz BW
100mV/DIV
IOUT1
0A TO 4A STEP
3.3A/DIV
1663 F05
VOUT2
AC-COUPLED
20MHz BW
100mV/DIV
IOUT2
0A TO 4A STEP
3.3A/DIV
Figure 6. Measured Output Voltage Ripple at 12V Input, 1.5V and
1.2V Output, 8A Per Channel with Standard Demo Circuit Default Setup
LOAD CURRENT (A)
0
EFFICIENCY (%)
64 53
1663 F02
95
90
21 87
85
80
75
60
70
65
5VIN
9VIN
12VIN
15VIN
18VIN
LOAD CURRENT (A)
0
EFFICIENCY (%)
5 6 743
1663 F03
95
90
21 8
85
80
75
60
70
65
5VIN
9VIN
12VIN
15VIN
18VIN
1663 F06
1.5V OUTPUT
AC-COUPLED
20MHz BW
50mV/DIV
1.2V OUTPUT
AC-COUPLED
20MHz BW
50mV/DIV

5
dc1663af
DEMO MANUAL DC1663A
PARTS LIST
ITEM QUANTITY REFERENCE-DESCRIPTION DESCRIPTION MANUFACTURER’S PART NUMBER
Required Circuit Components
1 4 CIN2, CIN3, CIN4, CIN5 Cap., X5R, 10µF, 35V, 10%, 1210 Murata, GRM32ER6YA106KA12
2 2 COUT1, COUT7 Cap., 470µF, 4V, POSCAP, F8 Sanyo, 4TPE470MCL
3 2 COUT4, COUT5 Cap., X5R, 100µF, 6.3V, 20%, 1210 AVX, 12106D107MAT2A
4 2 C5, C7 Cap., X5R, 0.1µF, 25V, 10%, 0603 AVX, 06033D104KAT
5 4 R1, R3, R22, R26 Res., Chip, 10, 1%, 0603 NIC, NRC06F10R0TRF
6 1 R19 Res., Chip, 60.4k, 1%, 0603 Vishay, CRCW060360K4FKED
7 1 R25 Res., Chip, 40.2k, 1%, 0603 Vishay, CRCW060340K2FKED
8 1 R30 Res., Chip, 100k, 1%, 0603 Vishay, CRCW0603100KFKED
9 1 U1 IC, High Efficiency Step-Down Module Linear Technology LTM4628EV
Additional Demo Board Circuit Components
1 1 CIN1 Cap., 150µF, 35V, Aluminum Electr., Sun Electronics, 35CE150AX
2 0 COUT2, COUT3, COUT6, COUT8 Cap., X5R, 100µF, 6.3V, 20% 1210 Optional AVX, 12106D107MAT2A Optional
3 0 C1 Cap., X7R, 1µF, 25V,10%, 0805 Optional AVX, 08053C105KAT2A Optional
4 1 C2 Cap., X7R, 1µF, 25V,10%, 0805 AVX, 08053C105KAT2A
5 0 C3, C4, C6, C8 to C12 Cap., 0603, Optional Optional
6 0 R2, R4, R6, R8, R16, R20, R40 Res., 0603, Optional Optional
7 0 R11, R14, R17, R23, R28, R31,
R33, R39
Res., Chip, 0, 1%, 0603, Optional Vishay, CRCW06030000Z0ED, Optional
8 4 R5, R24, R27, R36 Res., Chip, 10k, 1%, 0603 Vishay, CRCW060310K0FKED
9 2 C13, C14 Cap., X7R, 0.01µF, 16V, 10%, 0603 AVX, 0603YC103KAT2A
10 2 C15, C16 Cap., X7R, 1µF, 10V, 10%, 0603 AVX, 0603ZC105KAT
11 4 R7, R21, R29, R32 Res., Chip, 0, 1%, 0603 Vishay, CRCW06030000Z0ED
12 4 R9, R10, R13, R15 Res., Chip, 60.4k, 1%, 0603 Vishay, CRCW060360K4FKED
13 1 R12 Res., Chip, 30.1k, 1%, 0603 Vishay, CRCW060330R1FKED
14 1 R18 Res., Chip, 90.9k, 1%, 0603 Vishay, CRCW060390K9FKED
15 1 R34 Res., Chip, 0.001Ω, 0.5W, 2010 Vishay, WSL20101L000FEA
16 0 R35 Res., 2010, Optional Optional
17 1 R37 Res., Chip, 0.015Ω, 2W, 2512 Vishay, WSL2512R0150FEA
18 0 R38 Res., 2512, Optional Optional
19 1 Q1 N-Channel 30-V MOSFET Vishay, SUD50N03-09P
20 10 TP1 to TP5, TP10 to TP15 Testpoint, Turret, .094" pbf Mill-Max, 2501-2-00-80-00-00-07-0
21 4 TP18, TP20, TP22, TP23 Testpoint, Turret, .094" pbf Mill-Max, 2501-2-00-80-00-00-07-0
22 6 TP6, TP7, TP8, TP9, TP17, TP19 Jack Banana Keystone, 575-4
Hardware - for Demo Board Only
1 2 JP1, JP6 Header 4 Pin 0.079 Single Row Samtec, TMM104-02-L-S
2 3 JP2, JP3, JP4 Header 3 Pin 0.079 Single Row Samtec, TMM103-02-L-S
3 1 J5 Header 3 Pin 0.079 Double Row Samtec, TMM-103-02-L-D
4 6 XJP1 to XJP6 Shunt, .079" Center Samtec, 2SN-BK-G
5 3 J1, J2, J3 CON., SMA , PCB, Jack Amphenol Connex, 132134
6 4 Stand-Off Stand-Off, Nylon 0.50" Keystone, 8833 (Snap On)

6
dc1663af
DEMO MANUAL DC1663A
SCHEMATIC DIAGRAMS
5
5
4
4
3 3
2
2
1
1
D D
CC
B B A A
VIN+ VIN-
VIN
GND
4.5V-26.5V
VOUT1
GND
VO1+
VO1-
1.5V @ 8A
1.2V @ 8A
GND
VO2- VO2+
VOUT2
ON
MODE
PS
BM
CCM
TRACK1
ON
EXT.
SOFT-START
TRACK1 SEL.
NOTE: UNLESS OTHERWISE SPECIFIED 1. ALL RESISTORS AREIN 0603. ALL CAPACITORS AREIN0603.
o
CLKOUT
o
60
PHASE
o
120 90
VOUT1
VIN INTVCC
INTVCC
VO1+
VO1-
INTVCC
VO1-
VO1+
INTVCC
VOUT1
VO2+
VO2-
VIN
INTVCC
DIFFP
COMP1
DIFFN
DIFFOUT
VOUT1S
VOUT1
TRACK1
RUN1
VO2+
VOUT2
VO2-
VOUT2S
TRACK2
VFB2
COMP2
INTVCC
TEMP
RUN2
VFB1
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
JEFF ZPRODUCTION1 06-01-10
__
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
JEFF ZPRODUCTION1 06-01-10
__
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
JEFF ZPRODUCTION1 06-01-10
__
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
Tuesday, September 07, 2010
1 2
HIGH EFFICIENCY, DUAL 8A STEP-DOWN uMODULE REGULATOR
AK
JEFF Z.
N/A
LTM4628EV
DEMO CIRCUIT 1663A
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
Tuesday, September 07, 2010
1 2
HIGH EFFICIENCY, DUAL 8A STEP-DOWN uMODULE REGULATOR
AK
JEFF Z.
N/A
LTM4628EV
DEMO CIRCUIT 1663A
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
Tuesday, September 07, 2010
1 2
HIGH EFFICIENCY, DUAL 8A STEP-DOWN uMODULE REGULATOR
AK
JEFF Z.
N/A
LTM4628EV
DEMO CIRCUIT 1663A
JP1JP1
1
3
2
4
TP5TP5
TP17TP17
R16
OPT
R16
OPT
TP19TP19
JP3
OFF
RUN2
JP3
OFF
RUN2
1 3
2
TP11
TEMP
TP11
TEMP
TP20TP20
COUT3 OPT 1210 COUT3 OPT 1210
C10 OPT C10 OPT
R19
60.4K
R19
60.4K
C5 0.1uF C5 0.1uF
TP6TP6
R3 10 R3 10
TP13TP13
CIN4
10uF 1210
35V
CIN4
10uF 1210
35V
COUT2 OPT 1210 COUT2 OPT 1210
COUT6 OPT 1210 COUT6 OPT 1210
+
COUT1
470uF 4V
+
COUT1
470uF 4V
C4 OPT C4 OPT
C3 OPT C3 OPT
R10
60.4K
R10
60.4K
TP8TP8
R30 100K R30 100K
TP7TP7
C9 OPT C9 OPT
JP5
VOUT1
TRACK2 SEL.
JP5
VOUT1
TRACK2 SEL.
1
3
2
4
56
C7
0.1uF
C7
0.1uF
TP18 PGOOD2 TP18 PGOOD2
U1
LTM4628EV
U1
LTM4628EV
VIN J9
VIN J10
VIN J11
VIN K2
VIN K3
VIN K4
VIN K9
VIN K10
VIN K11
VIN
M2
VIN
M3
VIN
M4
VIN
M5
VIN
M6
VIN
M7
VIN
M8
VIN
M9
VIN
M10
VIN
M11
VIN L2
VIN L3
VIN L4
VIN L5
VIN L6
VIN L7
VIN L8
VIN L9
VIN
L10
VIN
L11
VIN J2
VIN J3
VIN J4
RUN1
F5
TRACK1
E5
VOUTS1
C5
VOUT1
A1
VOUT1
A2
VOUT1
A3
VOUT1
A4
VOUT1
A5
VFB1
D5
SW1
G2
PGOOD1
G9
COMP1
E6
DIFFOUT
F8
DIFFN
E9
DIFFP
E8
FSET
C6
PHASMD
G4
GND
A6
GND
A7
GND
B6
GND
B7
GND
D1
GND
D2
GND
D3
GND
D4
GND
D9
GND
D10
GND
D11
GND
D12
GND
E1
GND
E2
GND
E3
GND
E4
GND
E10
GND
E11
GND
E12
GND
F1
GND
F2
GND
F3
GND
F10
GND
F11
GND
F12
GND
G1
GND
G10
GND
G12
GND
H1
GND
H2
GND H3 GND H4
GND H5 GND H6 GND H7
GND H9 GND H10
GND H11
GND H12
GND J1
GND J5 GND J8
GND J12
GND K1
GND K5 GND K6 GND K7
GND K8
GND K12 GND L1 GND L12 GND M1 GND M12
SGND C7
SGND D6 SGND F6 SGND F7
SGND G6 SGND G7
VOUT1
B1
VOUT1
B2
VOUT1
B3
VOUT1
B4
VOUT1
B5
VOUT1
C1
VOUT1
C2
VOUT1
C3
VOUT1
C4
COMP2 E7
PGOOD2 G8
SW2 G11
VFB2 D7
TRACK2 D8
RUN2F9
VOUTS2 C8
TEMP J6
MODE-PLLIN F4
CLKOUT G5
INTVCC H8
EXTVCC J7
VOUT2 A8
VOUT2 A9
VOUT2 A10
VOUT2 A11
VOUT2 A12
VOUT2 B8
VOUT2 B9
VOUT2 B10
VOUT2 B11
VOUT2 B12
VOUT2 C9
VOUT2 C10
VOUT2 C11
VOUT2 C12
GND
G3
TP2
EXTVCC
TP2
EXTVCC
CIN3 10uF
35V
1210 CIN3 10uF
35V
1210
R15 60.4K R15 60.4K
R32
0
R32
0
R1 10 R1 10
C6 OPT C6 OPT
TP15TP15
CIN2 10uF
35V
1210 CIN2 10uF
35V
1210
R21 0 R21 0
COUT4 100uF
6.3V
1210 COUT4 100uF
6.3V
1210
TP1
CLKOUT
TP1
CLKOUT
R7 0 R7 0
COUT8 OPT 1210 COUT8 OPT 1210
C1 OPT C1 OPT
R22 10 R22 10
TP9TP9
C2 1uF C2 1uF
R20
OPT
R20
OPT
TP3TP3
R2
OPT
R2
OPT
R6 OPT R6 OPT
R24
10K
R24
10K
C12
OPT
C12
OPT
R27
10K
R27
10K
+
COUT7
470uF
4V
+
COUT7
470uF
4V
CIN5 10uF
35V
1210 CIN5 10uF
35V
1210
JP2
OFF
RUN1
JP2
OFF
RUN1
1
3
2
R5 10K R5 10K
TP4
CLKIN
TP4
CLKIN
R8
OPT
R8
OPT
C11
OPT
C11
OPT
JP6JP6
1
3
2
4
R18 90.9K R18 90.9K
TP14 TRACK2 TP14 TRACK2
R9 60.4K R9 60.4K
+
CIN1
150uF 35V
+
CIN1
150uF 35V
TP12TP12
TP21
SW1
TP21
SW1
R12
30.1K
R12
30.1K
C8
OPT
C8
OPT
TP22
PGOOD1 TP22 PGOOD1
R26
10
R26
10
JP4
SOFT-START
TRACK
JP4
SOFT-START
TRACK
1
3
2
TP10TP10
COUT5
100uF
6.3V
1210
COUT5
100uF
6.3V
1210
R13 60.4K R13 60.4K
R29
0
R29
0
TP16 SW2 TP16 SW2
R25
40.2K
R25
40.2K
R4 OPT R4 OPT

7
dc1663af
DEMO MANUAL DC1663A
SCHEMATIC DIAGRAMS
5 5
4
4
3
3
2 2
1
1
DD
CC
BB
AA
OPTIONAL JUMPER FOR 1 OUTPUT CONFIGURATION
DIFF SENSING SELECTION
VOUT1
LOAD TRANSIENT CIRCUIT
VOUT2
TEMP INTVCC
RUN1RUN2
TRACK1 TRACK2
VFB1 VFB2
COMP1 COMP2
VO2- DIFFN VO2+ DIFFP
VOUT1S VOUT1
VOUT2S DIFFOUT
VOUT1 VOUT2
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
Tuesday, September 07, 2010
2 2
HIGH EFFICIENCY, DUAL 8A STEP-DOWN uMODULE REGULATOR
AK
JEFF Z.
N/A
LTM4628EV
DEMO CIRCUIT 1663A
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
Tuesday, September 07, 2010
2 2
HIGH EFFICIENCY, DUAL 8A STEP-DOWN uMODULE REGULATOR
AK
JEFF Z.
N/A
LTM4628EV
DEMO CIRCUIT 1663A
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
Tuesday, September 07, 2010
2 2
HIGH EFFICIENCY, DUAL 8A STEP-DOWN uMODULE REGULATOR
AK
JEFF Z.
N/A
LTM4628EV
DEMO CIRCUIT 1663A
R36 10K R36 10K
TP23
IOSTEP CLK
TP23
IOSTEP CLK
J3
IOSTEP
J3
IOSTEP
R23
OPT
R23
OPT
R39 OPT R39 OPT
C13
0.01uF
C13
0.01uF
R35
OPT
2010
R35
OPT
2010
Q1 SUD50N03-09P Q1 SUD50N03-09P
2
1
34
R14 OPT R14 OPT
J1J1 C14
0.01uF
C14
0.01uF
R11
OPT
R11
OPT
R34
1mOHm
0.5W 2010 R34
1mOHm
0.5W 2010
R28 OPT R28 OPT
R38
OPT 2512
R38
OPT 2512
R33
OPT
R33
OPT
R17 OPT R17 OPT
C16 1uF C16 1uF
R40
OPT
R40
OPT
C15 1uF C15 1uF
R31
OPT
R31
OPT
J2J2
R37
0.015 2W 2512
R37
0.015 2W 2512
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.

8
dc1663af
DEMO MANUAL DC1663A
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
[phone] ●FAX: [phone] ●www.linear.com
 LINEAR TECHNOLOGY CORPORATION 2010
LT 0910 • 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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