Linear Technology DC1668A-C Quick setup guide

dc1668acf

DEMO MANUAL DC1668A-C

DESCRIPTION

LTM4627EV High Efficiency

50A PolyPhase Step-Down

Power Supply

BOARD PHOTO

Demonstration circuit 1668A-C is a PolyPhase

power

supply featuring four LTM

4627 high efficiency synchro-

nous buck µModule

regulators. The DC1668A-C input

voltage range is between 4.5V to 20V with a jumper pro-

grammable output voltage from 0.6V to 3.3V. The demo

circuit can deliver up to 50A of load with excellent current

sharing. Current derating may be necessary under certain

operating conditions.

The LTM4627 can be synchronized to an external clock be-

tween 250kHz to 770kHz. The default switching frequency

for the DC1668A-C is set to 500kHz through the onboard

LTC6902 clock generator. The external clock interleaves

the paralleled phases to minimize input and output ripple.

DC1668A-C demonstrates that paralleling LTM4627 mod-

ules is easy and reliable. These features and the availability

of the LTM4627 in a compact thermally enhanced 15mm ×

15mm × 4.32mm LGA package make the circuit ideal for

use in high density point of load regulation applications.

Design files for this circuit board are available at

http://www.linear.com/demo

L, LT, LTC, LTM, Linear Technology, PolyPhase, µModule and the Linear logo are registered

trademarks of Linear Technology Corporation. All other trademarks are the property of their

respective owners.

dc1668acf

DEMO MANUAL DC1668A-C

PARAMETER CONDITION VALUE

Input Voltage Range 4.5V to 20V

Output Voltage VOUT Remove VOUT SEL Jumper for VOUT = 0.6VDC 0.6VDC, 1VDC, 1.2VDC, 1.5VDC, 1.8VDC,

2.5VDC, 3.3VDC

Maximum Continuous Output Current IOUT(MAX) Current Derating May Be Necessary for Certain VIN,

VOUT, Frequency and Thermal Conditions.

50ADC

Default Operating Frequency 500kHz

External Clock Synchronous Frequency Range 250kHz to 770kHz

Output Voltage Ripple (Typical) VIN = 12V, VOUT = 1.8V

500kHz (20MHz BW)

< 10mVP-P at IOUT = 50A, See Figure 5

Efﬁciency VIN = 12V, VOUT = 1.8V

500kHz

87.7% at IOUT = 50A, See Figure 2

Load Transient VIN = 12V, VOUT = 1.8V See Figure 4

QUICK START PROCEDURE

PERFORMANCE SUMMARY

Demonstration circuit 1668A-C is easy to set up to evaluate

the performance of paralleled LTM4627 modules. Please

refer to Figure 1 for proper measurement equipment setup

and follow the procedure below:

1. With power off, connect the input power supply, load,

meters and VOUT BNC cable as shown in Figure 1.

Preset the load to 0A and VIN supply to be 0V. Place

jumpers in the following positions for a typical 1.8VOUT

application:

JP2 JP7 JP6

VOUT Select RUN TRACK/SS

1.8V OFF SOFT-START

2. Turn on the power at the input. Increase VIN to 12V

(Do not hot-plug the input supply or apply more than

the rated maximum voltage of 20V to the board or the

modules may be damaged).

3. Set the RUN pin jumper (JP7) to the ON position. The

output voltage should be regulated. The output voltage

meter should read 1.8V ±2% (1.76V to 1.84V).

4. Vary the input voltage from 5V to 20V and adjust the

load current from 0A to 50A. VOUT should remain

regulated at 1.8V ±2%. Observe the load regulation,

output voltage ripple, efficiency and other parameters.

Output voltage ripple should be measured at J6 with

a BNC cable and oscilloscope. The probe channel for

VOUT should be set at 50Ω termination resistance to

match the BNC cable.

5. For optional load transient testing apply an adjustable

positive pulse signal between IOSTEP CLK and GND

pins. The pulse amplitude sets the load step current

amplitude. The pulse width should be short (< 1ms)

and pulse duty cycle should be low (< 15%) to limit the

thermal stress on the load transient circuit. The load

step current can be monitored with a BNC connected

to J5 (5mV/A).

dc1668acf

DEMO MANUAL DC1668A-C

QUICK START PROCEDURE

Figure 1. Test Setup of DC1668A-C

–+

+–

–

VIN

BNC CABLE

TO OSCILLOSCOPE

TERMINATE INTO 50Ω

LOAD

1668ac F01

dc1668acf

DEMO MANUAL DC1668A-C

QUICK START PROCEDURE

Figure 2. Measured Efﬁciency at 12VIN, 500kHz

Figure 4. Measured Load Step Response

Figure 3. Thermal Capture at 12VIN, 1.8VOUT, 50A, 500kHz

No Forced Airﬂow (Convection). TA= 29°C

Figure 5. Measured Output Voltage Ripple (20MHz BW)

LOAD CURRENT (A)

EFFICIENCY (%)

504030

1668ac F02

2010

3.3VOUT

2.5VOUT

1.8VOUT

1.5VOUT

1.2VOUT

1VOUT

1668ac F04

20A/DIV

100mV/DIV

VOUT

IOUT STEP

VOUT = 1.8V

IOUT DC = 25A

IOUT STEP = 25A

fSW = 500kHz

1668ac F05

20mV/DIV

VOUT

VOUT = 1.8V

IOUT = 50A

fSW = 500kHz

dc1668acf

DEMO MANUAL DC1668A-C

PARTS LIST

ITEM QUANTITY REFERENCE-DESCRIPTION DESCRIPTION MANUFACTURER’S PART NUMBER

Required Circuit Components:

1 1 CIN1 Cap, 150µF 20% 35V Alum Sanyo 35MV150WXV

2 4 CIN13, CIN18, CIN20, CIN22 Cap, 1210 22µF 20% 25V X5R AVX 12103D226MAT2A

3 4 COUT1, COUT5, COUT9, COUT13 Cap, 1812 100µF 20% 6.3V X5R TDK C4532X5R0J107MZ

4 3 COUT20, COUT21, COUT25 Cap, 470µF 20% 4V POSCAP Sanyo POSCAP 4TPF470ML

5 2 R8 Res, 0603 0Ω Jumper Vishay CRCW06030000Z0EA

6 2 R18,R19 Res, 0603 10Ω 5% 1/10W AAC CR16-100JM

7 4 R30, R31, R32, R33 Res, 0603 100Ω 5% 1/10W KOA RK73B1JTTD101J

8 1 R34 Res, 0603 100k 5% 1/10W Vishay CRCW0603100KJNEA

9 1 R35 Res, 0805 0Ω Jumper Vishay CRCW08050000Z0EA

10 1 U5 IC, LTC6902CMS Multiphase Oscillator Linear Technology LTC6902CMS

11 1 C12 Cap, 0603 100pF 10% 50V NP0 AVX 06035A101KAT2A

12 4 C52, C53, C54, C61 Cap, 0603 180pF 5% 50V NP0 AVX 06035A181JAT

13 1 C61 Cap, 0603 180pF 5% 50V NP0 AVX 06035A181JAT

14 2 C65, C67 Cap, 0603 1000pF 10% 50V NP0 AVX 06035A102KAT2A

15 1 R1 Res, 0603 7.5k 1% 1/10W Vishay CRCW06037K50FKEA

16 1 R2 Res, 0603 10k 1% 1/10W Vishay CRCW060310K0FKEA

17 1 R3 Res, 0603 4.75k 1% 1/10W Vishay CRCW06034K75FKED

18 1 R4 Res, 0603 3.32k 1% 1/10W Vishay CRCW0603K32FKEA

19 1 R12 Res, 0603 22.6k 1% 1/10W Vishay CRCW060322K6FKEA

20 1 R14 Res, 0603 15k 1% 1/10W Vishay CRCW060315K0FKEA

21 1 R27 Res, 0603 0Ω Jumper Vishay CRCW06030000Z0EA

22 1 R29 Res, 0603 100k 1% 1/10W Vishay CRCW0603100KFKEA

23 4 U1, U2, U3, U4 IC, µModule Regulator Linear Technology LTM4627EV

Additional Demo Board Circuit Components:

1 2 C14, C28 Cap, 0603 0.1µF 20% 16V X7R Taiyo Yuden EMK107BJ104MA-T

2 1 C16 Cap, 0603 1µF 20% 10V X5R Taiyo Yuden LMK107BJ105MA-T

3 1 C60 Cap, 0603 1000pF 10% 50V NP0 AVX 06035A102KAT2A

4 1 D1 Diode, Zener 350mW Diodes Inc. MMBZ5227B

5 1 R7 Res, 0805 2k 5% 1/10W AAC CR10-202JM

6 1 Q14 XSTR, SUD50N03-10CP MOSFET Siliconix SUD50N03-10CP

7 1 R10 Res, 0603 10k 5% 1/10W AAC CR16-103JM

8 2 R20 Res, 0603 0Ω Jumper Vishay CRCW06030000Z0EA

9 3 R11, R16, R17 Res, 2512 0.015Ω 1% 1W Panasonic ERJM1WSF15MU

10 0 CIN2, CIN3 Cap, 1206 10µF 20% 35V X5R Option Taiyo Yuden GMK316BJ106ML-T Option

11 0 CIN14, CIN19, CIN21, CIN23 Cap, 1210 22µF 20% 25V X5R Option AVX 12103D226MAT2A Option

12 0 COUT2, COUT3, COUT6 Cap, 1812 100µF 20% 6.3V X5R Option TDK C4532X5R0J107MZ Option

13 0 COUT4, COUT7, COUT11 Cap, 1812 Option Taiyo Yuden JMK432BJ107MU-T Option

14 COUT15

15 0 COUT10, COUT14 Cap, 1812 100µF 20% 6.3V X5R Option TDK C4532X5R0J107MZ Option

dc1668acf

DEMO MANUAL DC1668A-C

ITEM QUANTITY REFERENCE-DESCRIPTION DESCRIPTION MANUFACTURER’S PART NUMBER

16 0 COUT19 Cap, 1206 Option Taiyo Yuden EMK316BJ475ML-T Option

17 0 COUT23, COUT26, COUT27 Cap, 470µF 20% 4V POSCAP Option Sanyo POSCAP 4TPF470ML Option

18 0 COUT24 Cap, 1812 Option Taiyo Yuden JMK316BJ226ML-T

19 0 C15 Cap, 0603 1µF 20% 10V X5R Option Taiyo Yuden LMK107BJ105MA-T Option

20 0 C18, C55, C56, C57, C58, C62 Cap, 0603 Option Option

21 C74 to C77

22 0 C59, C63, C66, C68 Cap, 0805 Option Option

23 0 C64 Cap, 0603 1000pF 10% 50V NP0 Option AVX 06035A102KAT2A Option

24 0 C69, C71, C72, C73 Cap, 150µF 20% 35V Alum Option Sanyo 35MV150WXV Option

25 1 C70 Cap, 0603 0.22µF 20% 10V X5R Option Taiyo Yuden LMK107BJ224MA-T Option

26 0 R9, R13, R15, R23, R24 Res, 0603 51k 5% 1/10W Option AAC CR16-513JM Option

27 0 R21, R22, R36 Res, 0603 Option Option

28 0 COUT22 Cap, 470µF 20% 4V POSCAP Option Sanyo POSCAP 4TPF470ML Option

29 1 COUT25 Cap, 470µF 20% 4V POSCAP Option Sanyo POSCAP 4TPF470ML

30 1 R26 Res, 0603 Option Option

Hardware

1 6 JP1, JP2, JP3, JP4, JP5, JP8 Header, 2 Pin, 2mm Samtec TMM 102-02-L-S

2 2 JP6, JP7 Header, 3 Pin, 2mm Samtec TMM-103-02-L-S

3 4 J1, J2, J3, J4 Stud, Press-Fit PEM KFH-032-10

4 2 J5, J6 Conn, BNC, 5 Pins Connex 112404

5 10 TP1 to TP8, TP13, TP14 Turret Mill Max 2501-2-00-80-00-00-07-0

6 3 JP1, JP6, JP7 Shunt, 2mm Samtec 2SN-BK-G

7 4 Standoff, Snap On Keystone 8834

8 8 J1, J2, J3, J4 Nut, Brass #10-32 Any

9 4 J1, J2, J3, J4 Washer, Brass #10 Any

10 4 J1, J2, J3, J4 Lug, Ring Keystone 310 PbF

PARTS LIST

dc1668acf

DEMO MANUAL DC1668A-C

SCHEMATIC DIAGRAMS

SOFTSTART

EXT.TRACK

VIN

GND

VIN+

VIN-

COMP

IOSTEP

CLK

VO+

VOUT

GND

VO-

TRACK/SS

VOUT

OFF

IOSTEP

0.6V - 3.3V

3.3V1.2V 1.5V 2.5V1.8V

VOUT SEL

4.5V - 20V

SHT 2,3

SHT 3

SHT 2,3

SGND

TRACK/SS

RUN

** ****

1.0V

PGOOD

402K

U1-U4

15k

100pF

OPT OPT

4TPF470ML

68pF

45.3k

10k

3.32k

30.1k OPT

CIN22

1nF

47pF

100K OPT

Poscap

1nF100uF

R27

OPT40A

Poscap

100uF

10k15k

6.34k

180pF

OPT

C61

68pF

OPT

22uF

R29

9.53k

30A

R12

180pF

OPT

COUT22R26ASSY

1nF

OPTOPT6.65k

OPT13.3k 4.42k

COUT25 C54

180pF

47pF

- A

100uF

CIN20

180pF7.5k

IOUT R3

U1,U2

30.1k 22uF

C53C12

OPT

50A

OPT

OPT 68pF OPT

4.75k

U1-U3 4TPF470ML

OPT

C65COUT9

OPT

* FSW = 500KHz

- C

20k

PHASE No.

22.6k

C67COUT13 C52R14

100pF

OPT

22uF

20k- B 133K

47pF

EXTVCC

NOTES: UNLESS OTHERWISE SPECIFIED,

35MV150WXV

1206 1206

35MV150WXV

1210 1210

0805

1206

2512 2512 2512

7343

1812 1812 1812 1812 1812

0805

1. ALL RESISTORS AND CAPACITORS ARE 0603.

SHT 2,3

VO+

VO-

VFB

VIN

VO-

VO+

VOUT

DIFFVOUT

COMP

VIN

VOUT

VIN

CLK1

COMP

VFB

DIFFVOUT

TRACK/SS

RUN

EXTVCC

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

SAM Y.

FIRST PROTOTYPE

104/29/10

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

SAM Y.

FIRST PROTOTYPE

104/29/10

REVISION HISTORY

DESCRIPTION DATEAPPROVEDECO REV

SAM Y.

FIRST PROTOTYPE

104/29/10

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Wednesday, October 20, 2010

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HIGH EFFICIENCY POLYPHASE STEP-DOWN

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LTM4627EV

DEMO CIRCUIT 1668A

POWER MODULE

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





















Wednesday, October 20, 2010



HIGH EFFICIENCY POLYPHASE STEP-DOWN







LTM4627EV

DEMO CIRCUIT 1668A

POWER MODULE









 

 









TECHNOLOGY









































Wednesday, October 20, 2010



HIGH EFFICIENCY POLYPHASE STEP-DOWN







LTM4627EV

DEMO CIRCUIT 1668A

POWER MODULE





C70

OPT

C70

OPT

R20 0R20 0

J6J6

C16

1uF

C16

1uF

C74

OPT

C74

OPT

CIN1

150uF

CIN1

150uF

JP3JP3

CIN2

OPT

35V

CIN2

OPT

35V

COUT3

OPT

COUT3

OPT

TP14TP14

C61 *C61 *

COUT1

100uF

6.3V

COUT1

100uF

6.3V

TP2TP2

R8 0R8 0

R17

0.015

R17

0.015

C18

OPT

C18

OPT

COUT24

OPT

COUT24

OPT

TP4TP4

R21

OPT

R21

OPT

JP5JP5

TP1TP1

JP1JP1

R14

Q14

SUD50N03-10CP

Q14

SUD50N03-10CP

J5J5

R19 10

TP6TP6

JP8JP8

CIN14

OPT

25V

CIN14

OPT

25V

TP5TP5

C69

OPT

C69

OPT

R13 OPTR13 OPT

COUT2

OPT

COUT2

OPT

J1J1

C55

OPT

C55

OPT

R16

0.015

R16

0.015

C59

OPT

C59

OPT

TP3TP3

JP6JP6

MMBZ5227B

1 3

OPT

C62

OPT

C62

OPT

R34 100KR34 100K

J2J2

R35

CIN3

OPT

35V

CIN3

OPT

35V

C60 1nFC60 1nF

LTM4627EV

SGND

G11

FSET

B12

VOUT_LCL

L12

COMP

A11

VFB

F12

RUN A10

TRACK/SS A9

PLLIN A8

INTVCC

VOSNS+

J12

VOSNS-

M12

DIFF_VOUT

K12

INTVCC

VIN A1

VIN A2

VIN A3

VIN A4

VIN A5

VIN A6

VIN B1

VIN B2

VIN B3

VIN B4

VIN B5

VIN B6

VIN C1

VIN C2

VIN C3

VIN C4

VIN C5

VIN C6

VOUT J1

VOUT J2

VOUT J3

VOUT J4

VOUT J5

VOUT J6

VOUT J7

VOUT J8

VOUT J9

VOUT J10

VOUT K1

VOUT K2

VOUT K3

VOUT K4

VOUT K5

VOUT K6

VOUT K7

VOUT K8

VOUT K9

VOUT K10

VOUT K11

VOUT L1

VOUT L2

VOUT L3

VOUT L4

VOUT L5

VOUT L6

VOUT L7

VOUT L8

VOUT L9

VOUT L10

VOUT L11

VOUT M1

VOUT M2

VOUT M3

VOUT M4

VOUT M5

VOUT M6

VOUT M7

VOUT M8

VOUT M9

VOUT M10

VOUT M11

PGND

PGND H6

PGND H7

PGND H8

PGND H9

SGND

H11

SGND

H12

PGND

C9 PGND

C7 PGND

B9 PGND

PGND

PGOOD

F11

PGOOD

G12

MTP8 D12

MTP7 D11

MTP6 D10

MTP5 C12

MTP4 C11

MTP3 C10

MTP2 B11

EXTVCC

E12

MTP1 A12

CIN13

22uF

25V

CIN13

22uF

25V

JP2JP2

R10

10K

R10

10K

R18

TP7TP7

R11

0.015

R11

0.015

R22

OPT

R22

OPT

R36

OPT

R36

OPT

R12

C12

COUT19

OPT

COUT19

OPT

JP7JP7

J3J3

TP13TP13

COUT20

470uF

COUT20

470uF

C14 0.1uFC14 0.1uF

COUT4

OPT

COUT4

OPT

JP4JP4

J4J4

TP8TP8

C15

OPT

C15

OPT

dc1668acf

DEMO MANUAL DC1668A-C

SCHEMATIC DIAGRAMS

SHT 1,3

SHT 1,3 SHT 1,3

SHT 1,3

SHT 3

SHT 1,3

35MV150WXV

1210

0805

7343 1812 1812 1812

1812 1812

7343 1812

35MV150WXV

1210 1210

0805

TRACK/SS

COMP

DIFFVOUT

VFB

DIFFVOUT

EXTVCC

COMP

EXTVCC

VIN

VOUT

VIN VOUT

VFB

DIFFVOUT

COMP

CLK2

TRACK/SS

RUN

CLK3

EXTVCC





 

 









TECHNOLOGY









































Wednesday, October 20, 2010



HIGH EFFICIENCY POLYPHASE STEP-DOWN







LTM4627EV

DEMO CIRCUIT 1668A

POWER MODULE









 

 









TECHNOLOGY









































Wednesday, October 20, 2010



HIGH EFFICIENCY POLYPHASE STEP-DOWN







LTM4627EV

DEMO CIRCUIT 1668A

POWER MODULE









 

 









TECHNOLOGY









































Wednesday, October 20, 2010



HIGH EFFICIENCY POLYPHASE STEP-DOWN







LTM4627EV

DEMO CIRCUIT 1668A

POWER MODULE





CIN21

OPT

CIN21

OPT

C63

OPT

C63

OPT

CIN19

OPT

CIN19

OPT

C71

OPT

C71

OPT

LTM4627EV

SGND

G11

FSET

B12

VOUT_LCL

L12

COMP

A11

VFB

F12

RUN A10

TRACK/SS A9

PLLIN A8

INTVCC

VOSNS+

J12

VOSNS-

M12

DIFF_VOUT

K12

INTVCC

VIN A1

VIN A2

VIN A3

VIN A4

VIN A5

VIN A6

VIN B1

VIN B2

VIN B3

VIN B4

VIN B5

VIN B6

VIN C1

VIN C2

VIN C3

VIN C4

VIN C5

VIN C6

VOUT J1

VOUT J2

VOUT J3

VOUT J4

VOUT J5

VOUT J6

VOUT J7

VOUT J8

VOUT J9

VOUT J10

VOUT K1

VOUT K2

VOUT K3

VOUT K4

VOUT K5

VOUT K6

VOUT K7

VOUT K8

VOUT K9

VOUT K10

VOUT K11

VOUT L1

VOUT L2

VOUT L3

VOUT L4

VOUT L5

VOUT L6

VOUT L7

VOUT L8

VOUT L9

VOUT L10

VOUT L11

VOUT M1

VOUT M2

VOUT M3

VOUT M4

VOUT M5

VOUT M6

VOUT M7

VOUT M8

VOUT M9

VOUT M10

VOUT M11

PGND

PGND H6

PGND H7

PGND H8

PGND H9

SGND

H11

SGND

H12

PGND

C9 PGND

C7 PGND

B9 PGND

PGND

PGOOD

F11

PGOOD

G12

MTP8 D12

MTP7 D11

MTP6 D10

MTP5 C12

MTP4 C11

MTP3 C10

MTP2 B11

EXTVCC

E12

MTP1 A12

C52 *

C64 1nFC64 1nF

C76

OPT

C76

OPT

COUT5

100uF

COUT5

100uF

COUT10

OPT

COUT10

OPT

COUT6

OPT

COUT6

OPT

R23 OPTR23 OPT

COUT21

470uF

COUT21

470uF

R15 OPT

C53 *

COUT9

COUT7

OPT

COUT7

OPT

LTM4627EV

SGND

G11

FSET

B12

VOUT_LCL

L12

COMP

A11

VFB

F12

RUN A10

TRACK/SS A9

PLLIN A8

INTVCC

VOSNS+

J12

VOSNS-

M12

DIFF_VOUT

K12

INTVCC

VIN A1

VIN A2

VIN A3

VIN A4

VIN A5

VIN A6

VIN B1

VIN B2

VIN B3

VIN B4

VIN B5

VIN B6

VIN C1

VIN C2

VIN C3

VIN C4

VIN C5

VIN C6

VOUT J1

VOUT J2

VOUT J3

VOUT J4

VOUT J5

VOUT J6

VOUT J7

VOUT J8

VOUT J9

VOUT J10

VOUT K1

VOUT K2

VOUT K3

VOUT K4

VOUT K5

VOUT K6

VOUT K7

VOUT K8

VOUT K9

VOUT K10

VOUT K11

VOUT L1

VOUT L2

VOUT L3

VOUT L4

VOUT L5

VOUT L6

VOUT L7

VOUT L8

VOUT L9

VOUT L10

VOUT L11

VOUT M1

VOUT M2

VOUT M3

VOUT M4

VOUT M5

VOUT M6

VOUT M7

VOUT M8

VOUT M9

VOUT M10

VOUT M11

PGND

PGND H6

PGND H7

PGND H8

PGND H9

SGND

H11

SGND

H12

PGND

C9 PGND

C7 PGND

B9 PGND

PGND

PGOOD

F11

PGOOD

G12

MTP8 D12

MTP7 D11

MTP6 D10

MTP5 C12

MTP4 C11

MTP3 C10

MTP2 B11

EXTVCC

E12

MTP1 A12

COUT22

C72

OPT

C72

OPT

CIN18

22uF

25V

CIN18

22uF

25V

C75

OPT

C75

OPT

C56 OPTC56 OPT

C57 OPTC57 OPT

C65 *

C68 OPTC68 OPT

COUT11

OPT

COUT11

OPT

CIN20

dc1668acf

DEMO MANUAL DC1668A-C

Information furnished by Linear Technology Corporation is believed to be accurate and reliable.

However, no responsibility is assumed for its use. LinearTechnology Corporation makes no representation

that the interconnection of its circuits as described herein will not infringe on existing patent rights.

SCHEMATIC DIAGRAMS

SHT 1,2

SHT 1,2 SHT 1,2

SHT 1,2

SHT 1

SHT 2

SHT 1,2

35MV150WXV

1210

0805

7343 7343 7343

7343

1812 1812

CLK4

VOUT

VIN

VOUT

DIFFVOUT

VFB

CLK1

CLK2

CLK3

TRACK/SS

RUN

COMP

EXTVCC





 

 









TECHNOLOGY









































Wednesday, October 20, 2010



HIGH EFFICIENCY POLYPHASE STEP-DOWN







LTM4627EV

DEMO CIRCUIT 1668A

POWER MODULE









 

 









TECHNOLOGY









































Wednesday, October 20, 2010



HIGH EFFICIENCY POLYPHASE STEP-DOWN







LTM4627EV

DEMO CIRCUIT 1668A

POWER MODULE









 

 









TECHNOLOGY









































Wednesday, October 20, 2010



HIGH EFFICIENCY POLYPHASE STEP-DOWN







LTM4627EV

DEMO CIRCUIT 1668A

POWER MODULE





COUT27

OPT

COUT27

OPT

COUT14

OPT

COUT14

OPT

R29

COUT13

C54 *C54 *

R26

R31 100R31 100

C73

OPT

C73

OPT

R30 100R30 100

C77

OPT

C77

OPT

R32 100R32 100

COUT25

COUT26

OPT

COUT26

OPT

C67 *

C66

OPT

C66

OPT

C58 OPTC58 OPT

LTM4627EV

SGND

G11

FSET

B12

VOUT_LCL

L12

COMP

A11

VFB

F12

RUN A10

TRACK/SS A9

PLLIN A8

INTVCC

VOSNS+

J12

VOSNS-

M12

DIFF_VOUT

K12

INTVCC

VIN A1

VIN A2

VIN A3

VIN A4

VIN A5

VIN A6

VIN B1

VIN B2

VIN B3

VIN B4

VIN B5

VIN B6

VIN C1

VIN C2

VIN C3

VIN C4

VIN C5

VIN C6

VOUT J1

VOUT J2

VOUT J3

VOUT J4

VOUT J5

VOUT J6

VOUT J7

VOUT J8

VOUT J9

VOUT J10

VOUT K1

VOUT K2

VOUT K3

VOUT K4

VOUT K5

VOUT K6

VOUT K7

VOUT K8

VOUT K9

VOUT K10

VOUT K11

VOUT L1

VOUT L2

VOUT L3

VOUT L4

VOUT L5

VOUT L6

VOUT L7

VOUT L8

VOUT L9

VOUT L10

VOUT L11

VOUT M1

VOUT M2

VOUT M3

VOUT M4

VOUT M5

VOUT M6

VOUT M7

VOUT M8

VOUT M9

VOUT M10

VOUT M11

PGND

PGND H6

PGND H7

PGND H8

PGND H9

SGND

H11

SGND

H12

PGND

C9 PGND

C7 PGND

B9 PGND

PGND

PGOOD

F11

PGOOD

G12

MTP8 D12

MTP7 D11

MTP6 D10

MTP5 C12

MTP4 C11

MTP3 C10

MTP2 B11

EXTVCC

E12

MTP1 A12

R24 OPT

LTC6902CMS

V+

DIV

OUT1

OUT2

5OUT3 6

OUT4 7

GND 8

MOD 9

SET 10

COUT15

OPT

COUT15

OPT

CIN22

22uF

CIN22

22uF

COUT23

OPT

COUT23

OPT

R33 100R33 100

R27

C38

0.1uF

C38

0.1uF

CIN23

OPT

CIN23

OPT

dc1668acf

DEMO MANUAL DC1668A-C

Linear Technology Corporation

1630 McCarthy Blvd., Milpitas, CA 95035-7417

(408) 432-1900 ●FAX: (408) 434-0507 ●www.linear.com

 LINEAR TECHNOLOGY CORPORATION 2010

LT 1110 • 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

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