1
dc1780acfa
DEMO MANUAL DC1780A-C
DESCRIPTION
LTM4620EV: High Efficiency,
PolyPhase 100A Step-Down
Power µModule
®
Regulator
Demonstration circuit 1780A-C features poly phase design
using the LTM
®
4620EV, the high efficiency, high density,
dual 13A, switch mode step-down power module regulator.
The input voltage is from 4.5V to 16V. The output voltage
is jumper selectable from 1.0V to 2.5V. DC1780A-C can
deliver nominal 100A output current with 4× LTM4620s
in parallel. As explained in the data sheet, output current
derating is necessary for certain VIN, VOUT, and thermal
conditions. The LTM4620 on DC1780A-C always operates
in continuous conduction mode. The switching frequency
can be programmed through a resistor or can be
synchronized to an external clock signal. The board allows
the user to program how its output voltage ramps up and
down through the TRACK_CONTROL pin. The output volt-
age is tightly regulated between VOUT+ and VOUT– through
remote output voltage sensing which improves output
voltage regulation at heavy loads. These features and
the availability of the LTM4620EV in a compact 15mm ×
15mm × 4.41mm LGA package make it ideal for use in
many high density point-of-load regulation applications.
The LTM4620 data sheet must be read in conjunction with
this demo manual prior to working on or modifying the
demo circuit DC1780A-C.
Design files for this circuit board are available at
http://www.linear.com/demo
L, LT, LTC, LTM, Linear Technology, the Linear logo, μModule and PolyPhase are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners.
Figure 1. 100A PolyPhase LTM4620/DC1780A-C Demo Board
BOARD PHOTO
2
dc1780acfa
DEMO MANUAL DC1780A-C
QUICK START PROCEDURE
Demonstration circuit DC1780A-C is easy to set up to
evaluate the performance of PolyPhase operation of the
LTM4620EV. Due to the high input/output current, select
a proper input supply/load/cable which can sustain the
full load operation. Please refer to Figure 2 for proper
measurement setup and follow the procedure below:
1. Place jumpers in the following positions for a typical
1.0VOUT application:
JP1 JP2 JP4-JP8
CLK RUN VOUT SELECT
INT_CLK OFF ON JP4/1.0V
2. With power off, connect the input power supply, load
and meters as shown in Figure 2. Preset the load to 0A
and VIN supply to 12V.
3. Turn on the power supply at the input. Place JP2 to
ON position. The output voltage between VOUT+ and
VOUT– should be 1.0V ± 1.5% (0.985V to 1.015V).
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 voltage ripple should
be measured at J7 with BNC cables. 50Ω termination
should be set on the oscilloscope or BNC cables.
5. (Optional) For optional load transient test, apply an
adjustable pulse signal between IOSTEP CLK and GND
test point. The pulse amplitude (3V to 3.5V) sets the load
step current amplitude. The output transient current can
be monitored at the BNC connector J8 (5mV/A). The
pulse signal should be very small duty cycle (< 10%)
to limit the thermal stress on the transient load circuit.
PERFORMANCE SUMMARY
Specifications are at TA = 25°C
PARAMETER CONDITIONS/NOTES VALUE
Input Voltage Range 4.5V to 16V
Output Voltage VOUT VIN = 4.5V to 16V, IOUT = 0A to 100A, JP4: 1.0V 1.0V ± 1.5% (0.985V to 1.015V)
Maximum Continuous Output Current Derating is necessary for certain VIN, VOUT and thermal
conditions, see data sheet for detail.
100A
Default Operating Frequency 500kHz
Resistor Programmable Frequency Range 400kHz to 780kHz
External Clock Sync. Frequency Range 400kHz to 780kHz
Efficiency VIN = 12V, VOUT = 1.0V, IOUT = 100A, fSW = 500kHz 80.5% See Figure 4
Load Transient VIN = 12V, VOUT = 1.0V, ISETP = 50A to 100A <156mV, See Figure 5
Output Voltage Ripple VIN = 12V, VOUT = 1.0V, IOUT = 100A, fSW = 500kHz <10mV, See Figure 6
Table 1. LTM4620 Demo Cards for up to 100A Point-of-Load Regulation
MAXIMUM
OUTPUT CURRENT
NUMBER OF OUTPUT
VOLTAGES
NUMBER OF LTM4620 μMODULE
REGULATORS ON THE BOARD DEMO CARD NUMBER
13A, 13A 2 1 DC1498A
50A 1 2 DC1780A-A
75A 1 3 DC1780A-B
100A 1 4 DC1780A-C
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dc1780acfa
DEMO MANUAL DC1780A-C
Figure 2. Test Setup of DC1780A-C
* Note: The output current is measured with a mV-voltage meter across a 1% accurate shunt resistor.
QUICK START PROCEDURE
*
6. (Optional) LTM4620 can be synchronized to an external
clock signal. Place the JP1 jumper on EXT_CLK and
apply a clock signal (0V to 5V, square wave) on the
EXT_CLK test point.
7. (Optional) The outputs of LTM4620 can track another
supply. The output voltage tracks the voltage on
TRACK_CONTROL when a valid signal is applied on
the test point.
8. (Optional) DC1780A-C can be configured to a dual
outputs configuration with VOUT at 87A load current
and VOUT2 at 13A load current. Stuff 0Ω resistor on
R61 and 0.1μF on C14. Remove R22, R23, R24, R26,
R27, R28, R32, R33, R35. Output voltage VOUT2 is set
by R37 based on the equation VOUT2 = 0.6V (1 + 60.4k/
R37).
4
dc1780acfa
DEMO MANUAL DC1780A-C
QUICK START PROCEDURE
Figure 3. Measured Efficiency VIN = 5V, fSW = 500kHz Figure 4. Measured Efficiency VIN = 12V, fSW = 500kHz
Figure 5. Load Transient 50A to 100A (VIN = 12V, VOUTX = 1V) Figure 6. Measured Output Voltage Ripple at 12VIN, 1VOUT,
100A on J7 with Standard Demo Circuit Default Setup
LOAD CURRENT (A)
0
EFFICIENCY (%)
100
90
80
70
60 4010
DC1780A-C F03
50 60 70 80 90 1003020
VIN = 5V, VOUT = 2.5V
VIN = 5V, VOUT = 1.8V
VIN = 5V, VOUT = 1.5V
VIN = 5V, VOUT = 1.2V
VIN = 5V, VOUT = 1V
DC1780A-C F06
1V OUTPUT (20MHz BW)
20mV/DIV
DC1780A-C F05
1V OUTPUT (20MHz BW)
100mV/DIV
50A TO 100A
LOAD STEP
LOAD CURRENT (A)
0
EFFICIENCY (%)
100
90
80
70
60 4010
DC1780A-C F04
50 60 70 80 90 1003020
VIN = 12V, VOUT = 2.5V
VIN = 12V, VOUT = 1.8V
VIN = 12V, VOUT = 1.5V
VIN = 12V, VOUT = 1.2V
VIN = 12V, VOUT = 1V
5
dc1780acfa
DEMO MANUAL DC1780A-C
Figure 7. Thermal Capture at 12VIN, 1.0VOUT at 100A (Ambient
Temperature = 23.3°C, 200LFM Airflow and No Heat Sink)
QUICK START PROCEDURE
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dc1780acfa
DEMO MANUAL DC1780A-C
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
Required Circuit Components
1 16 CIN3, CIN4, CIN5, CIN6, CIN7, CIN8, CIN9,
CIN10, CIN12, CIN13, CIN14, CIN15, CIN16,
CIN17, CIN18, CIN19
Cap., X5R 22μF 25V 10% 1210 Murata GRM32ER61226KE15
2 8 COUT1, COUT7, COUT11, COUT15, COUT20,
COUT26, COUT30, COUT34
Cap., X5R 100μF 10V 20% 1210 Taiyo Yuden LMK325BJ107MN-T
3 8 COUT4, COUT10, COUT12, COUT19, COUT23,
COUT29, COUT31, COUT37
Cap., POSCAP 470μF 4V 20% 7343 SANYO 4TPE470MCL
4 1 R14 Res., Chip 90.9k 0.06W 1% 0603 Vishay CRCW060390K9FKEA
5 4 R9, R31, R43, R51 Res., Chip 121k 0.06W 1% 0603 Vishay CRCW0603121KFKEA
6 2 R1, R3 Res., Chip 10Ω 0.06W 5% 0603 Vishay CRCW060310R0JNEA
7 4 C4, C10, C18, C22 Cap., X5R 2.2μF 10V 20% 0603 Taiyo Yuden LMK107BJ225MA
8 1 C7 Cap., X7R 0.1μF 25V 10% 0603 AVX 06033C104KAT2A
9 4 U1, U2, U3, U4 I.C., Voltage Regulator LGA(144)
15mm × 15mm × 4.41mm (1873-REV0)
Linear Technology Corp. LTM4620EV
Additional Demo Board Circuit Components
10 4 COUT5, COUT18, COUT24, COUT38 Cap., X5R 100μF 10V 20% 1210 Taiyo Yuden LMK325BJ107MN-T
11 2 COUT6, COUT25, Cap., POSCAP 470μF 4V 20% 7343 SANYO 4TPE470MCL
12 4 R2, R21, R39, R47 Res., Chip 121K 0.06W 1% 0603 Vishay CRCW0603121KFKEA
13 2 R25, R29 Res., Chip 10 0.06W 5% 0603 Vishay CRCW060310R0JNEA
14 1 C25 Cap., X7R 0.1μF 25V 10% 0603 AVX 06033C104KAT2A
15 1 CIN1 Cap., Alum 150μF 25V 25% SUNCON-8 SUNCON 25CE150AX
16 2 CIN2, CIN11 Cap., X5R 1μF 25V 10% 1210 Taiyo Yuden TMK325BJ105KM
17 0 COUT2, COUT3, COUT8, COUT9, COUT13,
COUT14, COUT16, COUT17, COUT21,
COUT22, COUT27, COUT28, COUT32,
COUT33, COUT35, COUT36 (OPT)
Cap., 1210
18 0 C1, C2, C3, C5, C8, C9, C12, C13, C14, C15,
C16, C17, C20, C21, C26, C29, C30 (OPT)
Cap., 0603
19 6 C6, C11, C19, C23, C27, C28 Cap., X7R 1μF 10V 10% 0603 Taiyo Yuden LMK107BJ105KA
20 1 C24 Cap., X7R 0.01μF 100V 10% 0603 AVX 06031C103KAT2A
21 2 Q1, Q2 Mosfet N-channel, 30V DPAK (TO-252) Vishay Siliconix SUD50N03-09P
22 4 R4, R36, R41, R54 Res., Chip 10k 0.06W 5% 0603 Vishay CRCW060310K0JNEA
23 0 R5, R7, R8, R10, R13, R30, R37, R38, R42,
R44, R48, R49, R50, R52, R53, R55, R61
(OPT)
Res., 0603
24 14 R6, R19, R20, R27, R28, R32, R33, R34, R35,
R40, R45, R46, R62, R63
Res/Jumper, Chip 0Ω1/16W 1A 0603 Vishay CRCW06030000Z0EA
25 1 R15 Res., Chip 60.4k 0.06W 1% 0603 Vishay CRCW060360K4FKEA
26 1 R16 Res., Chip 40.2k 0.06W 1% 0603 Vishay CRCW060340K2FKEA
27 1 R17 Res., Chip 30.1k 0.06W 1% 0603 Vishay CRCW060330K1FKEA
28 1 R18 Res., Chip 19.1k 0.06W 1% 0603 Vishay CRCW060319K1FKEA
29 4 R22, R23, R24, R26 Res., 0Ω 2010 TEPRO(NAKOMA) RNH6083
30 2 R56, R57 Res., 0.010 2W 1% 2512 Vishay WSL-2512-R01000-F-EA
31 0 R58, R59 (OPT) Res., 2512
7
dc1780acfa
DEMO MANUAL DC1780A-C
PARTS LIST
ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER
32 1 R60 Res/Jumper, Chip 0Ω 1/4W 1A 1206 Vishay CRCW12060000ZOEA
Hardware for Demo Board Only
33 3 XJP1, XJP2, XJP4 Shunt, 2mm Ctrs. Samtec 2SN-BK-G
34 4 MH1–MH4 STAND-OFF, NYLON 0.5" Tall KEYSTONE, 8833 (SNAP ON)
35 11 E1, E2, E3, E4, E6, E7, E8, E9, E12, E13, E22 Turret, Testpoint Mill Max 2308-2-00-80-00-00-07-0
36 0 E5, E10, E11, E14, E15, E16, E17, E18 (OPT) Testpoint
37 2 E19, E20 Turret, Testpoint Mill Max 2501-2-00-80-00-00-07-0
38 2 JP1, JP2 Headers, 3 Pins 2mm Ctrs. Samtec TMM-103-02-L-S
39 5 JP4, JP5, JP6, JP7, JP8 Jumper, 2 Pins 2mm Ctrs. Samtec TMM-102-02-L-S
40 6 J1, J2, J3, J4, J5, J6 Stud, Test Pin PEM KFH-032-10
41 12 NUT, BRASS NUTS #10-32 ANY, #10-32
42 6 RING, LUG RING #10 KEYSTONE, 8205
43 6 WASHER, #10, Tin Plated Brass ANY, #10 EXT BZ TN
44 2 J7, J8 BNC Connector Connex 112404
8
dc1780acfa
DEMO MANUAL DC1780A-C
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
DD
C C
B B
A A
VOUT
SELECT
NOTE: UNLESS OTHERWISE SPECIFIED.
1. ALL RESISTORS 0603.
2. ALL CAPACITORS 0603.
100A
JEFF Z.
2 PRODUCTION 02/06/12
-
VFB
PGOOD
COMP
RUN
TRACK
VOUT
VFB
PGOOD
COMP
RUN
TRACK
DIFFP
DIFFN
VFB
PGOOD
COMP
CLKOUT_U1
RUN
TRACK
VFB
VIN
INTVCC_U1
INTVCC_U1
VOUT
VO+
VO-
VO+
INTVCC_U1
VIN
VO+ VO-
VOUT
EXTVCC
SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 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
DEMO CIRCUIT 1780A-C
Wednesday, March 28, 2012
14
HIGH EFFICIENCY, POLYPHASE,
N/A
LTM4620EV
RB
JEFF Z.
STEP-DOWN POWER MODULE REGULATOR
C:\DOCUMENTS AND SETTINGS\JIAN_L\LOCAL SETTINGS\TEMP\WZ10E0\1780A-C_00_REV2.DSN SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 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
DEMO CIRCUIT 1780A-C
Wednesday, March 28, 2012
14
HIGH EFFICIENCY, POLYPHASE,
N/A
LTM4620EV
RB
JEFF Z.
STEP-DOWN POWER MODULE REGULATOR
C:\DOCUMENTS AND SETTINGS\JIAN_L\LOCAL SETTINGS\TEMP\WZ10E0\1780A-C_00_REV2.DSN SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 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
DEMO CIRCUIT 1780A-C
Wednesday, March 28, 2012
14
HIGH EFFICIENCY, POLYPHASE,
N/A
LTM4620EV
RB
JEFF Z.
STEP-DOWN POWER MODULE REGULATOR
C:\DOCUMENTS AND SETTINGS\JIAN_L\LOCAL SETTINGS\TEMP\WZ10E0\1780A-C_00_REV2.DSN
REVISION HISTORY
DESCRIPTION DATE
APPROVED
ECO REV
JEFF Z.1ST PROTOTYPE
-1 09/02/10
REVISION HISTORY
DESCRIPTION DATE
APPROVED
ECO REV
JEFF Z.1ST PROTOTYPE
-1 09/02/10
REVISION HISTORY
DESCRIPTION DATE
APPROVED
ECO REV
JEFF Z.1ST PROTOTYPE
-1 09/02/10
+
COUT4
470uF
4V
7343
+
COUT4
470uF
4V
7343
C1
(OPT)
C1
(OPT)
J1
4.5V - 16V
VIN
J1
4.5V - 16V
VIN
COUT9
(OPT)
1210
COUT9
(OPT)
1210
COUT8
(OPT)
1210
COUT8
(OPT)
1210
E5
SW1-1
E5
SW1-1
CIN6
22uF
25V
1210
CIN6
22uF
25V
1210
C6
1uF
10V
C6
1uF
10V
R60
0 Ohm
1206
R60
0 Ohm
1206
R9
121K
1%
R9
121K
1%
COUT1
100uF
10V
1210
COUT1
100uF
10V
1210
U1
LTM4620EV
U1
LTM4620EV
VOUT1
A1
VOUT1
A2
VOUT1
A3
VOUT1
A4
VOUT1
A5
VOUT1
B1
VOUT1
B2
VOUT1
B3
VOUT1
B4
VOUT1
B5
VOUT1
C1
VOUT1
C2
VOUT1
C3
VOUT1
C4
VFB1
D5
SW1
G2
PGOOD1
G9
COMP1
E6
RUN1
F5
TRACK1
E5
VOUT1S
C5
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
VFB2
D7
SW2
G11
PGOOD2
G8
COMP2
E7
RUN2
F9
TRACK2
D8
VOUT2S
C8
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
K2
VIN
K3
VIN
K4
VIN
K9
VIN
K10
VIN
K11
VIN
J2
VIN
J3
VIN
J4
VIN
J9
VIN
J10
VIN
J11
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
G3
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
M12
GND
M1
GND
L12
GND
J1
GND
J5
GND
J8
GND
J12
GND
K1
GND
K5
GND
K6
GND
K7
GND
K8
GND
K12
GND
L1
SGND
C7
SGND
D6
SGND
F6
SGND
F7
SGND
G6
SGND
G7
FSET
C6
PHASMD
G4
DIFFP
E8
DIFFN
E9
CLKOUT
G5
MODE-PLLIN
F4
TEMP
J6
INTVCC
H8
EXTVCC
J7
DIFFOUT
F8
R62
0 Ohm
R62
0 Ohm
E2
VO+
E2
VO+
R16
40.2K
1%
R16
40.2K
1%
CIN4
22uF
25V
1210
CIN4
22uF
25V
1210
C5
(OPT)
C5
(OPT)
C2
(OPT)
C2
(OPT)
R7
(OPT)
R7
(OPT)
+
CIN1
150uF
25V
+
CIN1
150uF
25V
R1
10
R1
10
JP1
EXT_CLK
INT_CLK
CLK
JP1
EXT_CLK
INT_CLK
CLK
1
3
2
J4
GND
J4
GND
CIN2
1uF
25V
1210
CIN2
1uF
25V
1210
E10
SW2-1
E10
SW2-1
E4
VIN-
E4
VIN-
CIN3
22uF
25V
1210
CIN3
22uF
25V
1210
R18
19.1K
1%
R18
19.1K
1%
J3
GND
J3
GND
R8
(OPT)
R8
(OPT)
+
COUT10
470uF
4V
+
COUT10
470uF
4V
R17
30.1K
1%
R17
30.1K
1%
R5
(OPT)
R5
(OPT)
J2
0.6 - 2.5V
VOUT
J2
0.6 - 2.5V
VOUT
+
COUT6
470uF
4V
7343
+
COUT6
470uF
4V
7343
E22
SGND
E22
SGND
R4
10K
R4
10K
COUT7
100uF
10V
1210
COUT7
100uF
10V
1210
R14
90.9K
1%
R14
90.9K
1%
COUT5
100uF
10V
1210
COUT5
100uF
10V
1210
E1
EXT_CLK
E1
EXT_CLK
CIN5
22uF
25V
1210
CIN5
22uF
25V
1210
JP5
1.2V
JP5
1.2V
R63
0 Ohm
R63
0 Ohm
JP6
1.5V
JP6
1.5V
E6
VO-
E6
VO-
COUT2
(OPT)
1210
COUT2
(OPT)
1210
JP7
1.8V
JP7
1.8V
R2
121K
1%
R2
121K
1%
JP4
1.0V
JP4
1.0V
C7
0.1uF
C7
0.1uF
JP2
ON
OFF
RUN
JP2
ON
OFF
RUN
1
3
2
JP8
2.5V
JP8
2.5V
E9
TRACK_CONTROL
E9
TRACK_CONTROL
E7
PGOOD
E7
PGOOD
COUT3
(OPT)
1210
COUT3
(OPT)
1210
R3
10
R3
10
R6
0 Ohm
R6
0 Ohm
R13
(OPT)
R13
(OPT)
C4
2.2uF
10V
C4
2.2uF
10V
E3
VIN+
E3
VIN+
C3
(OPT)
C3
(OPT)
R10
(OPT)
R10
(OPT)
R15
60.4K
1%
R15
60.4K
1%
E8
EXTVCC
E8
EXTVCC
9
dc1780acfa
DEMO MANUAL DC1780A-C
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
DD
C C
B B
A A
DO NOT STUFF 0 OHM JUMPERS
FOR SEPARATE VOUT2_U2.
COMP_U2
RUN_U2
COMP
TRACK_U2
VFB
PGOOD
RUN
TRACK
PGOOD_U2
DIFFOUT_U2
DIFFOUT_U2
VFB_U2
PGOOD_U2
VFB_U2
RUN_U2
COMP_U2
TRACK_U2
COMP
CLKOUT_U1
CLKOUT_U2
RUN
TRACK
PGOOD
VFB
VOUT
INTVCC_U2
VOUT2_U2
VIN
EXTVCC
INTVCC_U2
VO2+
VO2-
VO2+ VO2-
INTVCC_U2
VO2+
VOUT2_U2VOUT
VOUT2_U2
SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 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
DEMO CIRCUIT 1780A-C
Monday, February 06, 2012
24
HIGH EFFICIENCY, POLYPHASE,
N/A
LTM4620EV
RB
JEFF Z.
STEP-DOWN POWER MODULE REGULATOR
SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 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
DEMO CIRCUIT 1780A-C
Monday, February 06, 2012
24
HIGH EFFICIENCY, POLYPHASE,
N/A
LTM4620EV
RB
JEFF Z.
STEP-DOWN POWER MODULE REGULATOR
SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 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
DEMO CIRCUIT 1780A-C
Monday, February 06, 2012
24
HIGH EFFICIENCY, POLYPHASE,
N/A
LTM4620EV
RB
JEFF Z.
STEP-DOWN POWER MODULE REGULATOR
R29
10
R29
10
C11
1uF
10V
C11
1uF
10V
R23
0 Ohm
2010
R23
0 Ohm
2010
R38
(OPT)
R38
(OPT)
R19
0 Ohm
R19
0 Ohm
C8
(OPT)
C8
(OPT)
U2
LTM4620EV
U2
LTM4620EV
VOUT1
A1
VOUT1
A2
VOUT1
A3
VOUT1
A4
VOUT1
A5
VOUT1
B1
VOUT1
B2
VOUT1
B3
VOUT1
B4
VOUT1
B5
VOUT1
C1
VOUT1
C2
VOUT1
C3
VOUT1
C4
VFB1
D5
SW1
G2
PGOOD1
G9
COMP1
E6
RUN1
F5
TRACK1
E5
VOUT1S
C5
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
VFB2
D7
SW2
G11
PGOOD2
G8
COMP2
E7
RUN2
F9
TRACK2
D8
VOUT2S
C8
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
K2
VIN
K3
VIN
K4
VIN
K9
VIN
K10
VIN
K11
VIN
J2
VIN
J3
VIN
J4
VIN
J9
VIN
J10
VIN
J11
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
G3
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
M12
GND
M1
GND
L12
GND
J1
GND
J5
GND
J8
GND
J12
GND
K1
GND
K5
GND
K6
GND
K7
GND
K8
GND
K12
GND
L1
SGND
C7
SGND
D6
SGND
F6
SGND
F7
SGND
G6
SGND
G7
FSET
C6
PHASMD
G4
DIFFP
E8
DIFFN
E9
CLKOUT
G5
MODE-PLLIN
F4
TEMP
J6
INTVCC
H8
EXTVCC
J7
DIFFOUT
F8
R28
0 Ohm
R28
0 Ohm
C10
2.2uF
10V
C10
2.2uF
10V
+
COUT12
470uF
4V
7343
+
COUT12
470uF
4V
7343
E13
VO2-
E13
VO2-
E11
SW1-2
E11
SW1-2
R21
121K
1%
R21
121K
1%
COUT17
(OPT)
1210
COUT17
(OPT)
1210
CIN10
22uF
25V
1210
CIN10
22uF
25V
1210
R20
0 Ohm
R20
0 Ohm
R22
0 Ohm
2010
R22
0 Ohm
2010
R34
0 Ohm
R34
0 Ohm
R24
0 Ohm
2010
R24
0 Ohm
2010
E14
SW2-2
E14
SW2-2
+
COUT25
470uF
4V
7343
+
COUT25
470uF
4V
7343
R31
121K
1%
R31
121K
1%
J5
VOUT2_U2
VOUT/
J5
VOUT2_U2
VOUT/
CIN9
22uF
25V
1210
CIN9
22uF
25V
1210
COUT16
(OPT)
1210
COUT16
(OPT)
1210
R30
(OPT)
R30
(OPT)
R26
0 Ohm
2010
R26
0 Ohm
2010
C14
(OPT)
C14
(OPT)
COUT15
100uF
10V
1210
COUT15
100uF
10V
1210
+
COUT19
470uF
4V
7343
+
COUT19
470uF
4V
7343
C12
(OPT)
C12
(OPT)
C9
(OPT)
C9
(OPT)
E12
VO2+
E12
VO2+
R36
10K
R36
10K
R35
0 Ohm
R35
0 Ohm
CIN7
22uF
25V
1210
CIN7
22uF
25V
1210
COUT38
100uF
10V
1210
COUT38
100uF
10V
1210
J6
GND
J6
GND
R61
(OPT)
R61
(OPT)
R27
0 Ohm
R27
0 Ohm
R33
0 Ohm
R33
0 Ohm
C15
(OPT)
C15
(OPT)
COUT11
100uF
10V
1210
COUT11
100uF
10V
1210
COUT18
100uF
10V
1210
COUT18
100uF
10V
1210
R37
(OPT)
R37
(OPT)
C13
(OPT)
C13
(OPT)
COUT13
(OPT)
1210
COUT13
(OPT)
1210
CIN8
22uF
25V
1210
CIN8
22uF
25V
1210
R25
10
R25
10
COUT14
(OPT)
1210
COUT14
(OPT)
1210
R32
0 Ohm
R32
0 Ohm
10
dc1780acfa
DEMO MANUAL DC1780A-C
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
DD
C C
B B
A A
COMP
RUN
COMP
CLKOUT_U2
CLKOUT_U3
VFB
PGOOD
RUN
VFB
TRACK
PGOOD
TRACK
COMP
CLKOUT_U2
CLKOUT_U3
RUN
VFB
PGOOD
TRACK
VOUT
INTVCC_U3
VOUT
VIN
EXTVCC
INTVCC_U3
INTVCC_U3
INTVCC_U3
SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 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
DEMO CIRCUIT 1780A-C
Monday, February 06, 2012
34
HIGH EFFICIENCY, POLYPHASE,
N/A
LTM4620EV
RB
JEFF Z.
STEP-DOWN POWER MODULE REGULATOR
SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 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
DEMO CIRCUIT 1780A-C
Monday, February 06, 2012
34
HIGH EFFICIENCY, POLYPHASE,
N/A
LTM4620EV
RB
JEFF Z.
STEP-DOWN POWER MODULE REGULATOR
SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 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
DEMO CIRCUIT 1780A-C
Monday, February 06, 2012
34
HIGH EFFICIENCY, POLYPHASE,
N/A
LTM4620EV
RB
JEFF Z.
STEP-DOWN POWER MODULE REGULATOR
C16
(OPT)
C16
(OPT)
COUT26
100uF
10V
1210
COUT26
100uF
10V
1210
COUT27
(OPT)
1210
COUT27
(OPT)
1210
COUT28
(OPT)
1210
COUT28
(OPT)
1210
CIN13
22uF
25V
1210
CIN13
22uF
25V
1210
C19
1uF
10V
C19
1uF
10V
C17
(OPT)
C17
(OPT)
E15
SW1-3
E15
SW1-3
U3
LTM4620EV
U3
LTM4620EV
VOUT1
A1
VOUT1
A2
VOUT1
A3
VOUT1
A4
VOUT1
A5
VOUT1
B1
VOUT1
B2
VOUT1
B3
VOUT1
B4
VOUT1
B5
VOUT1
C1
VOUT1
C2
VOUT1
C3
VOUT1
C4
VFB1
D5
SW1
G2
PGOOD1
G9
COMP1
E6
RUN1
F5
TRACK1
E5
VOUT1S
C5
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
VFB2
D7
SW2
G11
PGOOD2
G8
COMP2
E7
RUN2
F9
TRACK2
D8
VOUT2S
C8
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
K2
VIN
K3
VIN
K4
VIN
K9
VIN
K10
VIN
K11
VIN
J2
VIN
J3
VIN
J4
VIN
J9
VIN
J10
VIN
J11
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
G3
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
M12
GND
M1
GND
L12
GND
J1
GND
J5
GND
J8
GND
J12
GND
K1
GND
K5
GND
K6
GND
K7
GND
K8
GND
K12
GND
L1
SGND
C7
SGND
D6
SGND
F6
SGND
F7
SGND
G6
SGND
G7
FSET
C6
PHASMD
G4
DIFFP
E8
DIFFN
E9
CLKOUT
G5
MODE-PLLIN
F4
TEMP
J6
INTVCC
H8
EXTVCC
J7
DIFFOUT
F8
COUT20
100uF
10V
1210
COUT20
100uF
10V
1210
CIN12
22uF
25V
1210
CIN12
22uF
25V
1210
+
COUT23
470uF
4V
7343
+
COUT23
470uF
4V
7343
C18
2.2uF
10V
C18
2.2uF
10V
R42
(OPT)
R42
(OPT)
R39
121K
1%
R39
121K
1%
R41
10K
R41
10K
R43
121K
1%
R43
121K
1%
COUT22
(OPT)
1210
COUT22
(OPT)
1210
CIN15
22uF
25V
1210
CIN15
22uF
25V
1210
R44
(OPT)
R44
(OPT)
COUT21
(OPT)
1210
COUT21
(OPT)
1210
COUT24
100uF
10V
1210
COUT24
100uF
10V
1210
CIN11
1uF
25V
1210
CIN11
1uF
25V
1210
+
COUT29
470uF
4V
7343
+
COUT29
470uF
4V
7343
R40
0 Ohm
R40
0 Ohm
CIN14
22uF
25V
1210
CIN14
22uF
25V
1210
E16
SW2-3
E16
SW2-3
11
dc1780acfa
DEMO MANUAL DC1780A-C
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
DD
C C
B B
A A
LOAD TRANSIENT CIRCUIT
CLKOUT_U4
CLKOUT_U4
COMP
RUN
COMP
TRACK
VFB
PGOOD
RUN
VFB
TRACK
PGOOD
CLKOUT_U3
VFB
COMP
CLKOUT_U3
RUN
TRACK
PGOOD
INTVCC_U4
VOUT
VOUTVIN
EXTVCC
INTVCC_U4
VOUT
VO+
VO-
SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 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
DEMO CIRCUIT 1780A-C
Monday, February 06, 2012
44
HIGH EFFICIENCY, POLYPHASE,
N/A
LTM4620EV
RB
JEFF Z.
STEP-DOWN POWER MODULE REGULATOR
SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 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
DEMO CIRCUIT 1780A-C
Monday, February 06, 2012
44
HIGH EFFICIENCY, POLYPHASE,
N/A
LTM4620EV
RB
JEFF Z.
STEP-DOWN POWER MODULE REGULATOR
SIZE
DATE:
.VER.ON CI
SHEET OF
TITLE:
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
Fax: (408)434-0507
Milpitas, CA 95035
Phone: (408)432-1900
1630 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
DEMO CIRCUIT 1780A-C
Monday, February 06, 2012
44
HIGH EFFICIENCY, POLYPHASE,
N/A
LTM4620EV
RB
JEFF Z.
STEP-DOWN POWER MODULE REGULATOR
J7
VOUT
J7
VOUT
R49
(OPT)
R49
(OPT)
R53
(OPT)
R53
(OPT)
R51
121K
1%
R51
121K
1%
C22
2.2uF
10V
C22
2.2uF
10V
CIN18
22uF
25V
1210
CIN18
22uF
25V
1210
+
COUT37
470uF
4V
7343
+
COUT37
470uF
4V
7343
+
COUT31
470uF
4V
7343
+
COUT31
470uF
4V
7343
C26
(OPT)
C26
(OPT) C27
1uF
10V
C27
1uF
10V
R52
(OPT)
R52
(OPT)
R58
(OPT)
2512
R58
(OPT)
2512
Q2
SUD50N03-09P
Q2
SUD50N03-09P
R48
(OPT)
R48
(OPT)
COUT36
(OPT)
1210
COUT36
(OPT)
1210
R47
121K
1%
R47
121K
1%
C23
1uF
10V
C23
1uF
10V
R57
0.010
1%
2W
2512
R57
0.010
1%
2W
2512
R45
0 Ohm
R45
0 Ohm
Q1
SUD50N03-09P
Q1
SUD50N03-09P
C21
(OPT)
C21
(OPT)
E18
SW2-4
E18
SW2-4
COUT33
(OPT)
1210
COUT33
(OPT)
1210
R46
0 Ohm
R46
0 Ohm
R50
(OPT)
R50
(OPT)
COUT32
(OPT)
1210
COUT32
(OPT)
1210
R55
(OPT)
R55
(OPT)
C30
(OPT)
C30
(OPT) R59
(OPT)
2512
R59
(OPT)
2512
C29
(OPT)
C29
(OPT)
CIN16
22uF
25V
1210
CIN16
22uF
25V
1210
CIN17
22uF
25V
1210
CIN17
22uF
25V
1210
R54
10K
R54
10K
CIN19
22uF
25V
1210
CIN19
22uF
25V
1210
E17
SW1-4
E17
SW1-4
COUT35
(OPT)
1210
COUT35
(OPT)
1210
C28
1uF
10V
C28
1uF
10V
C24
0.01uF
C24
0.01uF
J8
IOSTEP
J8
IOSTEP
COUT34
100uF
10V
1210
COUT34
100uF
10V
1210
COUT30
100uF
10V
1210
COUT30
100uF
10V
1210
R56
0.010
1%
2W
2512
R56
0.010
1%
2W
2512
U4
LTM4620EV
U4
LTM4620EV
VOUT1
A1
VOUT1
A2
VOUT1
A3
VOUT1
A4
VOUT1
A5
VOUT1
B1
VOUT1
B2
VOUT1
B3
VOUT1
B4
VOUT1
B5
VOUT1
C1
VOUT1
C2
VOUT1
C3
VOUT1
C4
VFB1
D5
SW1
G2
PGOOD1
G9
COMP1
E6
RUN1
F5
TRACK1
E5
VOUT1S
C5
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
VFB2
D7
SW2
G11
PGOOD2
G8
COMP2
E7
RUN2
F9
TRACK2
D8
VOUT2S
C8
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
K2
VIN
K3
VIN
K4
VIN
K9
VIN
K10
VIN
K11
VIN
J2
VIN
J3
VIN
J4
VIN
J9
VIN
J10
VIN
J11
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
G3
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
M12
GND
M1
GND
L12
GND
J1
GND
J5
GND
J8
GND
J12
GND
K1
GND
K5
GND
K6
GND
K7
GND
K8
GND
K12
GND
L1
SGND
C7
SGND
D6
SGND
F6
SGND
F7
SGND
G6
SGND
G7
FSET
C6
PHASMD
G4
DIFFP
E8
DIFFN
E9
CLKOUT
G5
MODE-PLLIN
F4
TEMP
J6
INTVCC
H8
EXTVCC
J7
DIFFOUT
F8
E19
IOSTEP CLK
E19
IOSTEP CLK
C25
0.1uF
C25
0.1uF
E20
GND
E20
GND
C20
(OPT)
C20
(OPT)
12
dc1780acfa
DEMO MANUAL DC1780A-C
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2012
LT 0712 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
