Linear Technology DC1780A-A Guida rapida alla configurazione

dc1780aafa

DEMO MANUAL DC1780A-A

DESCRIPTION

LTM4620EV: High Efficiency,

PolyPhase 50A Step-Down

Power µModule

Regulator

Demonstration circuit 1780A-A features PolyPhase

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-A can deliver nominal 50Aoutput current with 2×

LTM4620sin parallel.As explainedin thedata sheet,output

current derating is necessary for certain VIN, VOUT, and

thermal conditions. The LTM4620 on DC1780A-A always

operate in continuous conduction mode. The switching

frequency can be programmed through a resistor or can

be synchronized to an external clock signal. The board

allowstheusertoprogramhowits outputvoltage rampsup

and down through the TRACK_CONTROL pin. The output

voltage 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-A.

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. 50A PolyPhase LTM4620/DC1780A-A Demo Board

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dc1780aafa

DEMO MANUAL DC1780A-A

QUICK START PROCEDURE

Demonstration circuit DC1780A-A 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. Oncetheproper outputvoltage isestablished, adjustthe

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

testpoint.The pulseamplitude (3Vto 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 50A, 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.

50A

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 = 50A, fSW = 500kHz 82.4% See Figure 4

Load Transient VIN = 12V, VOUT = 1.0V, ISETP = 25A to 50A <138mV, See Figure 5

Output Voltage Ripple VIN = 12V, VOUT = 1.0V, IOUT = 50A <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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dc1780aafa

DEMO MANUAL DC1780A-A

Figure 2. Test Setup of DC1780A-A

* 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-A can be configured to a dual

outputs configuration with VOUT at 37A load current

and VOUT2 at 13A load current. Stuff 0 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).

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dc1780aafa

DEMO MANUAL DC1780A-A

QUICK START PROCEDURE

Figure 3. Measured Efficiency VIN = 5V, fSW = 500kHz Figure 4. Measured Efficiency VIN = 12V, fSW = 500kHz

LOAD CURRENT (A)

EFFICIENCY (%)

100

60 4010

DC1780A-A F03

503020

VIN = 5V, VOUT = 2.5V

VIN = 5V, VOUT = 1.8V

VIN = 5V, VOUT = 1.5V

VIN = 5V, VOUT = 1.2V

VIN = 5V, VOUT = 1V

LOAD CURRENT (A)

EFFICIENCY (%)

100

60 4010

DC1780A-A F04

503020

VIN = 12V, VOUT = 2.5V

VIN = 12V, VOUT = 1.8V

VIN = 12V, VOUT = 1.5V

VIN = 12V, VOUT = 1.2V

VIN = 12V, VOUT = 1V

Figure 5. Load Transient 25A to 50A (VIN = 12V, VOUT = 1V) Figure 6. Measured Output Voltage Ripple at 12VIN, 1VOUT,

50A on J7 with Standard Demo Circuit Default Setup

DC1780A-A F05

1V OUTPUT (20MHz BW)

100mV/DIV

25A TO 50A LOAD

DC1780A-A F06

1V OUTPUT (20MHz BW)

10mV/DIV

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dc1780aafa

DEMO MANUAL DC1780A-A

Figure 7. Thermal Capture at 12VIN, 1.0VOUT at 50A (Ambient

Temperature = 23.3°C, No Airflow and No Heat Sink)

Figure 8, Thermal Capture at 12VIN, 1.0VOUT at 50A (Ambient

Temperature = 23.3°C, 200LFM Airflow and No Heat Sink)

QUICK START PROCEDURE

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dc1780aafa

DEMO MANUAL DC1780A-A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

Required Circuit Components

1 8 CIN3, CIN4, CIN5, CIN6, CIN7, CIN8, CIN9, CIN10 Cap., X5R 22µF 25V 10% 1210 Murata GRM32ER61226KE15

2 4 COUT1, COUT7, COUT11, COUT15, Cap., X5R 100µF 10V 20% 1210 Taiyo Yuden LMK325BJ107MN-T

3 4 COUT4, COUT10, COUT12, COUT19 Cap., POSCAP 470µF 4V 20% 7343 SANYO 4TPE470MCL

4 1 R14 Res., Chip 90.9k 0.06W 1% 0603 Vishay CRCW060390K9FKEA

5 2 R9, R31 Res., Chip 121k 0.06W 1% 0603 Vishay CRCW0603121KFKEA

6 2 R1, R3 Res., Chip 10 0.06W 5% 0603 Vishay CRCW060310R0JNEA

7 2 C4, C10 Cap., X5R 2.2µF 10V 20% 0603 Taiyo Yuden LMK107BJ225MA

8 1 C7 Cap., X7R 0.1µF 25V 10% 0603 AVX 06033C104KAT2A

9 2 U1, U2 I.C., Volt. Reg. LGA(144)

15MMX15MMX4.41MM(1873-REV0)

Linear Technology Corp.

LTM4620EV

Additional Demo Board Circuit Components

10 1 C25 Cap., X7R 0.1µF 25V 10% 0603 AVX 06033C104KAT2A

11 2 COUT5, COUT18, COUT24, COUT38 Cap., X5R 100µF 10V 20% 1210 Taiyo Yuden LMK325BJ107MN-T

12 2 COUT6, COUT25 Cap., POSCAP 470µF 4V 20% 7343 SANYO 4TPE470MCL

13 1 R15 Res., Chip 60.4k 0.06W 1% 0603 Vishay CRCW060360K4FKEA

14 1 R16 Res., Chip 40.2k 0.06W 1% 0603 Vishay CRCW060340K2FKEA

15 1 R17 Res., Chip 30.1k 0.06W 1% 0603 Vishay CRCW060330K1FKEA

16 1 R18 Res., Chip 19.1k 0.06W 1% 0603 Vishay CRCW060319K1FKEA

17 6 R2, R21, R39, R43, R47, R51 Res., Chip 121k 0.06W 1% 0603 Vishay CRCW0603121KFKEA

18 2 R25, R29 Res., Chip 10 0.06W 5% 0603 Vishay CRCW060310R0JNEA

19 2 C18, C22 Cap., X5R 2.2µF 10V 20% 0603 Taiyo Yuden LMK107BJ225MA

20 1 CIN1 Cap., Alum 150µF 25V 25% SUNCON-8 SUNCON 25CE150AX

21 2 CIN2, CIN11 Cap., X5R 1µF 25V 10% 1210 Taiyo Yuden TMK325BJ105KM

22 4 R22, R23, R24, R26 Res., 0Ω 2010 TEPRO(NAKOMA) RNH6083

23 2 R56, R57 Res., 0.010 2W 1% 2512 Vishay WSL-2512-R01000-F-EA

24 0 R58, R59 (OPT) Res., 2512

25 1 R60 Res/Jumper, Chip 0 1/4W 1A 1206 Vishay CRCW12060000ZOEA

26 4 R4, R36, R41, R54 Res., Chip 10k 0.06W 5% 0603 Vishay CRCW060310K0JNEA

27 0 R5, R7, R8, R10, R13, R30, R34, R37, R38, R42,

R44, R48, R49, R50, R52, R53, R55, R61 (OPT)

Res., 0603

28 13 R6, R19, R20, R27, R28, R32, R33, R35, R40, R45,

R46, R62, R63,

Res/Jumper, Chip 0 1/16W 1A 0603 Vishay CRCW06030000Z0EA

29 0 COUT23, COUT29, COUT31, COUT37 (OPT) Cap., “D” Case 7343

30 0 C1, C2, C3, C5, C8, C9, C12, C13, C14, C15, C16,

C17, C20, C21, C26, C29, C30 (OPT)

Cap., 0603

31 6 C6, C11, C19, C23, C27, C28 Cap., X7R 1µF 10V 10% 0603 Taiyo Yuden LMK107BJ105KA

32 1 C24 Cap., X7R 0.01µF 100V 10% 0603 AVX 06031C103KAT2A

33 2 Q1, Q2 Mosfet N-channel, 30V DPAK(TO-252) Vishay Siliconix SUD50N03-09P

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dc1780aafa

DEMO MANUAL DC1780A-A

PARTS LIST

ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER

34 0 COUT2, COUT3, COUT8, COUT9, CIN12, COUT13,

CIN13, COUT14, CIN14, CIN15, COUT16, CIN16,

COUT17, CIN17, CIN18, CIN19, COUT20, COUT21,

COUT22, COUT26, COUT27, COUT28, COUT30,

COUT32, COUT33, COUT34, COUT35, COUT36 (OPT)

Cap., 1210

Hardware for Demo Board only

35 3 XJP1, XJP2, XJP4 Shunt, 2mm Ctrs. Samtec 2SN-BK-G

36 4 MH1-MH4 STAND-OFF, NYLON 0.5" Tall KEYSTONE, 8833 (SNAP ON)

37 2 J7, J8 BNC Connector Connex 112404

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 11 E1, E2, E3, E4, E6, E7, E8, E9, E12, E13, E22 Turret, Test Point Mill Max 2308-2-00-80-00-00-07-0

42 0 E5, E10, E11, E14, E15, E16, E17, E18 (Opt) Test Point

43 2 E19, E20 Turret, Test Point Mill Max 2501-2-00-80-00-00-07-0

44 12 NUT, BRASS NUTS #10-32 ANY, #10-32

45 6 RING, LUG RING # 10 KEYSTONE, 8205

46 6 WASHER, #10, Tin Plated Brass ANY, #10 EXT BZ TN

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dc1780aafa

DEMO MANUAL DC1780A-A

SCHEMATIC DIAGRAM

D D

C C

B B

A A

VOUT

SELECT

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50A

VFB

PGOOD

COMP

RUN

TRACK

VOUT

VFB

PGOOD

COMP

RUN

TRACK

DIFFP

DIFFN

VFB

PGOOD

COMP

CLKOUT_U1

RUN

TRACK

VFB

VIN

INTVCC_U1

VOUT

VO+

VO-

VO+

INTVCC_U1

VIN

VO+ VO-

VOUT

EXTVCC

REVISION HISTORY

DESCRIPTION DATE

APPROVED

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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.

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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

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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.

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COUT7

100uF

10V

1210

COUT7

100uF

10V

1210

TRACK_CONTROL

R16

40.2K

R16

40.2K

EXTVCC

JP8

2.5V

JP8

2.5V

CIN5

22uF

25V

1210

CIN5

22uF

25V

1210

JP2

OFF

RUN

JP2

OFF

RUN

EXT_CLK

0 Ohm

COUT6

470uF

7343

COUT6

470uF

7343

1uF

10V

1uF

10V

(OPT)

0.1uF

COUT5

100uF

10V

1210

COUT5

100uF

10V

1210

JP4

1.0V

JP4

1.0V

CIN6

22uF

25V

1210

CIN6

22uF

25V

1210

10K

COUT4

470uF

7343

COUT4

470uF

7343

2.2uF

10V

2.2uF

10V

CIN1

150uF

25V

CIN1

150uF

25V

(OPT)

121K

(OPT)

JP7

1.8V

JP7

1.8V

121K

COUT2

(OPT)

1210

COUT2

(OPT)

1210

(OPT)

VIN-

VO-

VO+

R15

60.4K

R15

60.4K

R14

90.9K

R14

90.9K

R13

(OPT)

R13

(OPT)

COUT3

(OPT)

1210

COUT3

(OPT)

1210

E22

SGND

E22

SGND

0.6 - 2.5V

VOUT

0.6 - 2.5V

VOUT

E10

SW2-1

E10

SW2-1

SW1-1

R17

30.1K

R17

30.1K

JP6

1.5V

JP6

1.5V

R62

0 Ohm

R62

0 Ohm

COUT10

470uF

COUT10

470uF

CIN2

1uF

25V

1210

CIN2

1uF

25V

1210

LTM4620EV

VOUT1

VFB1

SW1

PGOOD1

COMP1

RUN1

TRACK1

VOUT1S

VOUT2

A10

VOUT2

A11

VOUT2

A12

VOUT2

B10

VOUT2

B11

VOUT2

B12

VOUT2

C10

VOUT2

C11

VOUT2

C12

VFB2

SW2

G11

PGOOD2

COMP2

RUN2

TRACK2

VOUT2S

VIN

M10

VIN

M11

VIN

L10

VIN

L11

VIN

K10

VIN

K11

VIN

J10

VIN

J11

GND

D10

GND

D11

GND

D12

GND

E10

GND

E11

GND

E12

GND

F10

GND

F11

GND

F12

GND

G10

GND

G12

GND

H10

GND

H11

GND

H12

GND

M12

GND

L12

GND

J12

GND

K12

GND

SGND

FSET

PHASMD

DIFFP

DIFFN

CLKOUT

MODE-PLLIN

TEMP

INTVCC

EXTVCC

DIFFOUT

COUT8

(OPT)

1210

COUT8

(OPT)

1210

R10

(OPT)

R10

(OPT)

VIN+

GND

COUT9

(OPT)

1210

COUT9

(OPT)

1210

R60

0 Ohm

1206

R60

0 Ohm

1206

R63

0 Ohm

R63

0 Ohm

PGOOD

(OPT)

GND

R18

19.1K

R18

19.1K

JP5

1.2V

JP5

1.2V

JP1

EXT_CLK

INT_CLK

CLK

JP1

EXT_CLK

INT_CLK

CLK

COUT1

100uF

10V

1210

COUT1

100uF

10V

1210

(OPT)

CIN4

22uF

25V

1210

CIN4

22uF

25V

1210

CIN3

22uF

25V

1210

CIN3

22uF

25V

1210

4.5V - 16V

VIN

4.5V - 16V

VIN

Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.Downloaded from Arrow.com.

dc1780aafa

DEMO MANUAL DC1780A-A

SCHEMATIC DIAGRAM

D D

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

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:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

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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

'(02&,5&8,7$$

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C:\PADS PROJECTS\1780A\SCH\1780A-A\1780A-A_00_REV1.DSN

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

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/7&&21),'(17,$/)25&86720(586(21/<

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

'(02&,5&8,7$$

)ULGD\'HFHPEHU

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JEFF Z.

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C:\PADS PROJECTS\1780A\SCH\1780A-A\1780A-A_00_REV1.DSN

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

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3KRQH

0F&DUWK\%OYG

/7&&21),'(17,$/)25&86720(586(21/<

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

'(02&,5&8,7$$

)ULGD\'HFHPEHU

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JEFF Z.

67(3'2:132:(502'8/(5(*8/$725

C:\PADS PROJECTS\1780A\SCH\1780A-A\1780A-A_00_REV1.DSN

R29

C11

1uF

10V

C11

1uF

10V

R23

0 Ohm

2010

R23

0 Ohm

2010

R38

(OPT)

R38

(OPT)

R19

0 Ohm

R19

0 Ohm

(OPT)

LTM4620EV

VOUT1

VFB1

SW1

PGOOD1

COMP1

RUN1

TRACK1

VOUT1S

VOUT2

A10

VOUT2

A11

VOUT2

A12

VOUT2

B10

VOUT2

B11

VOUT2

B12

VOUT2

C10

VOUT2

C11

VOUT2

C12

VFB2

SW2

G11

PGOOD2

COMP2

RUN2

TRACK2

VOUT2S

VIN

M10

VIN

M11

VIN

L10

VIN

L11

VIN

K10

VIN

K11

VIN

J10

VIN

J11

GND

D10

GND

D11

GND

D12

GND

E10

GND

E11

GND

E12

GND

F10

GND

F11

GND

F12

GND

G10

GND

G12

GND

H10

GND

H11

GND

H12

GND

M12

GND

L12

GND

J12

GND

K12

GND

SGND

FSET

PHASMD

DIFFP

DIFFN

CLKOUT

MODE-PLLIN

TEMP

INTVCC

EXTVCC

DIFFOUT

R28

0 Ohm

R28

0 Ohm

C10

2.2uF

10V

C10

2.2uF

10V

COUT12

470uF

7343

COUT12

470uF

7343

E13

VO2-

E13

VO2-

E11

SW1-2

E11

SW1-2

R21

121K

R21

121K

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

R24

0 Ohm

2010

R24

0 Ohm

2010

E14

SW2-2

E14

SW2-2

COUT25

470uF

7343

COUT25

470uF

7343

R31

121K

R31

121K

VOUT2_U2

VOUT/

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

7343

COUT19

470uF

7343

C12

(OPT)

C12

(OPT)

E12

VO2+

E12

VO2+

R36

10K

R36

10K

R35

0 Ohm

R35

0 Ohm

R34

(OPT)

R34

(OPT)

CIN7

22uF

25V

1210

CIN7

22uF

25V

1210

COUT38

100uF

10V

1210

COUT38

100uF

10V

1210

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

COUT14

(OPT)

1210

COUT14

(OPT)

1210

R32

0 Ohm

R32

0 Ohm

dc1780aafa

DEMO MANUAL DC1780A-A

SCHEMATIC DIAGRAM

D D

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

SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

)D[

0LOSLWDV&$

3KRQH

0F&DUWK\%OYG

/7&&21),'(17,$/)25&86720(586(21/<

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

'(02&,5&8,7$$

0RQGD\'HFHPEHU

+,*+()),&,(1&<32/<3+$6(

1$

/70(9

JEFF Z.

67(3'2:132:(502'8/(5(*8/$725

C:\PADS PROJECTS\1780A\SCH\1780A-A\1780A-A_00_REV1.DSN SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

)D[

0LOSLWDV&$

3KRQH

0F&DUWK\%OYG

/7&&21),'(17,$/)25&86720(586(21/<

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

'(02&,5&8,7$$

0RQGD\'HFHPEHU

+,*+()),&,(1&<32/<3+$6(

1$

/70(9

JEFF Z.

67(3'2:132:(502'8/(5(*8/$725

C:\PADS PROJECTS\1780A\SCH\1780A-A\1780A-A_00_REV1.DSN SIZE

DATE:

IC NO. REV.

SHEET OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

)D[

0LOSLWDV&$

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0F&DUWK\%OYG

/7&&21),'(17,$/)25&86720(586(21/<

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

'(02&,5&8,7$$

0RQGD\'HFHPEHU

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1$

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JEFF Z.

67(3'2:132:(502'8/(5(*8/$725

C:\PADS PROJECTS\1780A\SCH\1780A-A\1780A-A_00_REV1.DSN

C16

(OPT)

C16

(OPT)

CIN15

(OPT)

1210

CIN15

(OPT)

1210

COUT23

(OPT)

7343

COUT23

(OPT)

7343

COUT27

(OPT)

1210

COUT27

(OPT)

1210

COUT28

(OPT)

1210

COUT28

(OPT)

1210

C19

1uF

10V

C19

1uF

10V

C17

(OPT)

C17

(OPT)

E15

SW1-3

E15

SW1-3

CIN14

(OPT)

1210

CIN14

(OPT)

1210

CIN12

(OPT)

1210

CIN12

(OPT)

1210

(OPT)

VOUT1

VFB1

SW1

PGOOD1

COMP1

RUN1

TRACK1

VOUT1S

VOUT2

A10

VOUT2

A11

VOUT2

A12

VOUT2

B10

VOUT2

B11

VOUT2

B12

VOUT2

C10

VOUT2

C11

VOUT2

C12

VFB2

SW2

G11

PGOOD2

COMP2

RUN2

TRACK2

VOUT2S

VIN

M10

VIN

M11

VIN

L10

VIN

L11

VIN

K10

VIN

K11

VIN

J10

VIN

J11

GND

D10

GND

D11

GND

D12

GND

E10

GND

E11

GND

E12

GND

F10

GND

F11

GND

F12

GND

G10

GND

G12

GND

H10

GND

H11

GND

H12

GND

M12

GND

L12

GND

J12

GND

K12

GND

SGND

FSET

PHASMD

DIFFP

DIFFN

CLKOUT

MODE-PLLIN

TEMP

INTVCC

EXTVCC

DIFFOUT

C18

2.2uF

10V

C18

2.2uF

10V

R42

(OPT)

R42

(OPT)

CIN13

(OPT)

1210

CIN13

(OPT)

1210

R39

121K

R39

121K

R41

10K

R41

10K

R43

121K

R43

121K

COUT26

(OPT)

1210

COUT26

(OPT)

1210

COUT22

(OPT)

1210

COUT22

(OPT)

1210

R44

(OPT)

R44

(OPT)

COUT20

(OPT)

1210

COUT20

(OPT)

1210

COUT21

(OPT)

1210

COUT21

(OPT)

1210

COUT24

100uF

10V

1210

COUT24

100uF

10V

1210

COUT29

(OPT)

7343

COUT29

(OPT)

7343

CIN11

1uF

25V

1210

CIN11

1uF

25V

1210

R40

0 Ohm

R40

0 Ohm

ϭϲ

SW2-3

ϭϲ

SW2-3

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