DEMO MANUAL DC1245A

LTM4616

Dual 2.7V

IN(MIN)

, 8A Step-Down

µModule Regulator

Description

Demonstration circuit 1245A features the

LTM

®

4616,

the

high efficiency, high density, dual output switch mode

power module. The rated load current is 8A for each chan-

nel, while derating is necessary for certain V

IN

, V

OUT

, and

thermal conditions. By applying a clock signal to the CLKIN

pin, the module’s switching frequency may be synchronized

from 0.75MHz to 2.25MHz. The same clock frequency is

available at the CLKOUT pin with the phase relationship

between CLKIN and CLKOUT determined by the PHMODE

pin. This feature can be used not only to reduce undesirable

frequency harmonics but also to parallel the two channels

of LTM4616 or even multiple LTM4616s and LTM4608s to

provide higher output currents. The LTM4616 data sheet

must be read in conjunction with this demo manual prior

to working on or modifying demo circuit DC1245A.

Design files for this circuit board are available at

http://www.linear.com/demo/DC1245A

L,

LT, LTC, LTM, µModule, Linear Technology and the Linear logo are registered trademarks of

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

perForMAnce sUMMArY

PARAMETER

Input Voltage Range

Output Voltage V

OUT1

V

OUT2

Maximum Continuous Output Current

Default Operating Frequency

Efficiency

Load Transient

CONDITIONS

(T

A

= 25°C)

VALUE

2.7V to 5.5V

1.8 ±2%

1.2 ±2%

8A

DC

Each Channel

1.5MHz

V

IN

= 3.3V, I

OUT1

= 8A

I

OUT2

= 8A

Derating Is Necessary for Certain V

IN

, V

OUT

, and Thermal

Conditions, See Data Sheet for Details

V

IN

= 5V, V

OUT1

= 1.8V, V

OUT2

= 1.2V, 8A Per Channel

V

IN

= 3.3V, V

OUT1

=1.8V; V

OUT2

= 1.2V

77.5%, See Figure 3 for More Information

See Figures 4 and 5 for Details

BoArD photo

dc1245afa

1

DEMO MANUAL DC1245A

qUick stArt proceDUre

Demonstration circuit 1245A is an easy way to evaluate

the performance of the LTM4616. Please refer to Figure 1

for proper measurement equipment setup and follow the

procedure below:

1. Place jumpers in the following positions for a typical

1.8V

OUT

and 1.2V

OUT

application:

PHMODE2

2PH

TRACK1

DISABLED

MARGINING2

NO

PHMODE1

2PH

RUN2

ON

MODE

BURST

MARGINING1

NO

RUN1

ON

4. Once the proper output voltage is established, adjust

the load within the operating range and observe the

output voltage regulation, ripple voltage, efficiency and

other parameters. To measure input and output ripple,

please refer to Figure 2 for proper setup.

5. To synchronize channel 1 to an external clock, please

apply the desired clock signal to CLKIN and SGND1.

The external clock signal should have amplitude of at

least 2V but less than V

IN

.

6. V

OUT1

can track another supply connected at TP20 as

determined by resistors R6 and R17. V

OUT2

is set up

to track V

OUT1

in a manner determined by resistors

R15 and R16. By default both resistor pairs have been

selected to support coincident tracking. Please refer to

Figure 6 for reference.

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

and meters as shown in Figure 1. Preset the load to 0A

and V

IN

supply within the 2.7V to 5.5V operating range.

3. Turn on the power at the input. The output voltage at

VO1

+

and VO1

–

should be 1.8V ±2% and the voltage

at VO2

+

and VO2

–

should be 1.2V ±2%.

INPUT OR OUTPUT CAPACITOR

Figure 2. Proper Scope Probe Placement

for Measuring Input or Output Ripple

Overall Efficiency vs Load Current

95

90

85

80

EFFICIENCY (%)

75

70

65

60

55

50

45

40

35

0

2

6

4

8

10

LOAD CURRENT FOR EACH CHANNEL (A)

dc1245a F03

V

IN

= 3.3V, V

O1

= 1.8V, V

O2

= 1.2V

V

IN

= 5V, V

O1

= 1.8V, V

O2

= 1.2V

Figure 3. Measured Overall Supply Efficiency with Different V

IN

Figure 1. Test Setup of DC1245A

dc1245afa

2

DEMO MANUAL DC1245A

qUick stArt proceDUre

7. Channel 2 is set up to synchronize to the CLKOUT sig-

nal of channel 1. The default phase difference is 180°.

Please refer to data sheet for how to set up PHMODE1

and PHMODE2 for paralleling more than 2 channels.

dc1245a F05

V

IN

= 3.3V

V

OUT

=1.2V

CONTINUOUS CURRENT MODE (CCM)

2A TO 6A LOAD STEP

C

OUT

=

×2

100µF CERAMIC (1210, X5R, 6.3V) +

22µF CERAMIC (0805, X5R, 6.3V)

C

FF2

= 0pF

V

OUT

OVERSHOOT AND UNDERSHOOT = 128mV

dc1245a F04

V

IN

= 3.3V

V

OUT

=1.8V

CONTINUOUS CURRENT MODE (CCM)

2A TO 6A LOAD STEP

C

OUT

=

×2

100µF CERAMIC (1210, X5R, 6.3V) +

22µF CERAMIC (0805, X5R, 6.3V)

C

FF1

= 47pF

V

OUT

OVERSHOOT AND UNDERSHOOT = 172mV

Figure 5. Measured Load Transient Response for 1.2V

OUT

(4A Step, 25% to 75%)

Figure 4. Measured Load Transient Response for 1.8V

OUT

(4A Step, 25% to 75%)

Figure 6. Measured Tracking Performance of V

OUT1

and V

OUT2

(with 2A Load Current)

dc1245afa

3

DEMO MANUAL DC1245A

pArts list

ITEM

1

2

3

4

5

6

1

2

3

4

5

6

7

8

1

2

3

4

5

6

7

8

9

10

11

QTY

4

1

4

1

0

2

0

1

3

1

0

5

3

8

15

2

4

2

4

REFERENCE

CIN1, CIN2, CO13, CO23

CIN4

CO11, CO12, CO21, CO22

RSET1

RSET2

U1

CO14, CO15, CO24, CO25 (OPT)

R7, R5

R9, R11, R19 (OPT)

CTHP1, CTHP2, C1, CFF2, CSP (OPT)

CFF1

R17

R15, R16, R6

R18

CIN3(OPT)

JP1, JP2, JP3-JP5

JP6, JP7, JP9

JP1-JP7, JP9

TP1, TP2, TP7-TP10, TP12, TP14-TP18,

TP20-TP22

TP6, TP3

TP4, TP5, TP11, TP13

(STAND-OFF)

PART DESCRIPTION

Capacitor, X5R, 22µF 6.3V, 20%, 1206

,

Capacitor, OS-CON, 150µF 10V, E7 Size

,

Capacitor, X5R, 100µF 6.3V, 20%, 1210

,

Resistor, Chip, 4.99k, 1/16W, 1%, 0402

Resistor, Chip, 10k, 1/16W, 1%, 0402

IC LTM4616EV 144-Pin LGA

Capacitor, 1210-3743

Resistor, Chip, 100k, 1/16W, 5%, 0402

Resistor, Chip, 0402

Capacitor, 0402

Capacitor, C0G, 47pF 50V, 10%, 0402

,

Resistor, Chip, 4.99k, 1/16W, 1%, 0402

Resistor, Chip, 10k, 1/16W, 1%, 0402

Resistor, Chip, 0, 1/16W, 0402

Capacitor, 1210-3743

2

×

3, 0.079 Double Row Header

Header 3-Pin 0.079 Single Row

Shunt, 0.079" Center

Testpoint, Turret, 0.094" Pbf

Stud, Test Pin

Nut, Brass Nuts #10-32

Ring, Lug Ring #10

Washer, Tin Plated Brass

Jack Banana

Stand-Off, Nylon 0.50"

Samtec, TMM103-02-L-D

Samtec, TMM103-02-L-S

Samtec, 2SN-BK-G

Mill-Max, 2501-2-00-80-00-00-07-0

PEM KFH-032-10

Any #10-32

Keystone #10

Any #10

Keystone, 575-4

Keystone, 8833(SNAP ON)

AVX, 04025A470KAT2A

Vishay, CRCW04024K99FKED

Vishay, CRCW040210K0FKED

Vishay, CRCW04020000Z0ED

Vishay, CRCW0402100KJNED

MANUFACTURER/PART NUMBER

AVX, 12066D226MAT2A

Sanyo, 10SVPA150MAA

AVX, 12106D107MAT2A

Vishay, CRCW04024K99FKED

Vishay, CRCW040210K0FKED

Linear Technology, LTM4616EV

Required Circuit Components

Additional Demo Board Circuit Components

Hardware/Components (For Demo Board Only)

dc1245afa

4

VIN+

VOUT1

TP4

TP2

VO1+

VOUT1

TP1

VIN

CIN2

22uF

6.3V

SVIN1

U1

LTM4616EV

F1

F2

F3

F4

E1

E2

E3

E4

D1

D2

C1

C2

B6

E5

J1

J2

K1

K2

L1

L2

L3

L4

M1

M2

M3

M4

H6

TP3

SVIN2

L5

VIN

CO11

100uF

6.3V

CO12

100uF

6.3V

TP5

TP7

VOUT2

CO21

100uF

6.3V

CO22

100uF

6.3V

CO23

22uF

6.3V

CO24

opt

6.3V

CO25

opt

6.3V

TP9

CO13

22uF

6.3V

CO14

opt

6.3V

CO15

opt

6.3V

2.5V - 5.5V

R5

100K

SW1

VIN1

SVIN1

VIN2

SW2

SVIN2

+

CIN4

150uF

10V

R7

100K

CIN3

100uF

opt

CIN1

22uF

6.3V

1.8V @ 8A MAX

GND1

VO1-

VO2+

GND

TP6

VIN-

A11

PGOOD1

PGOOD2

G11

TP8

PGOOD1

scheMAtic DiAgrAM

PGOOD2

A6

BSEL1

MGN1

MODE1

A10

TP10

TP12

VOUT1

D9

D10

D11

D12

E9

E10

E11

E12

F9

F10

F11

F12

VOUT2

TP11

1.2V @ 8A MAX

TP13

TP14

GND2

VO2-

PBS1

MODE

A8

VOUT1

ITH2

ITHM2

E7

BSEL2

MGN2

MODE2

ITH2

ITHM2

CLKOUT2

A9

PHMODE1

PHMODE2

TRACK2

RUN2

RUN1

PLLFLTR2

PLLFLTR1

CLKIN1

CLKIN2

SGND2

GND2

M5

G7

SGND1

GND1

E6

L6

M6

L8

G9

TRACK1

E8

FB2

K8

M7

L7

M8

G8

G10

G6

ITHM1

SVIN1

R9

R11 opt

CLK

F7

CLKOUT1

FB1

D8

LOW

5

JP1

*

MARGINING1

HI

1

2

NO

3

4

opt

CTHP1

F8

ITH1

opt.

ITH2

6

ITHM2

TP15

VOUT2

K9

K10

K11

K12

L9

L10

L11

L12

M9

M10

M11

M12

PBS2

JP2

*

MARGINING2

2

4

6

TP16

MODE

ITH2

ITHM2

CTHP2

opt.

R18 0

SVIN2 VOUT2

1

SVIN1

CFF1

VFB

47pF

(PULSE SKIPPING) PS

BURST

1

JP3

MODE

RSET1

4.99K

HI

2

VOUT1

NO

3

5

LOW

RSET2

CFF2

10.0K 1%

opt

VOUT2

SVIN2

R19

PFB2

PFB1

VFB

opt

TP17

TP18

VOUT1

SVIN2

JP5

PHMODE2

2

1

3

4

(CONTINUOUS) CON

5

6

SVIN1

C1

opt

F6

A7

JP4

PHMODE1

CLK

3PH (PHASE)

F5

4PH (PHASE)

2PH (PHASE)

1

2

3

4

5

6

CLKOUT

VFB

A1

A2

A3

A4

A5

A12

B1

B2

B3

B4

B5

B7

B8

B9

B10

B11

B12

C3

C4

C5

C6

C7

C8

C9

C10

C11

C12

D3

D4

D5

D6

D7

SVIN1

1

G1

G2

G3

G4

G5

G12

H1

H2

H3

H4

H5

H7

H8

H9

H10

H11

H12

J3

J4

J5

J6

J7

J8

J9

J10

J11

J12

K3

K4

K5

K6

K7

2PH (PHASE)

4

6

3

5

JP6

TRACK1

2

1

DISABLED

RUN1

JP7

ENABLED

3

2

ON

OFF

R15

10.0K

1%

4PH (PHASE)

3PH (PHASE)

TRACK

3

R6

TP20

10K

CSP

opt

R16

10.0K

1%

SVIN2

1

2

R17

4.99K

CLKIN

IN LAYOUT, MANUALLY TIED ALL GND TOGETHER ON LAYER 2.

3

OFF

ON

JP9

RUN2

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.

CUSTOMER NOTICE

CONTRACT NO.

APPROVALS

DRAWN

ENGINEER

CHECKED

APPROVED

Friday, February 15, 2008

TP21

SGND1

TP22

1630 McCarthy Blvd.

Milpitas, CA 95035

Phone: (408)432-1900

Fax: (408)434-0507

*DC1245A STILL USES THE OLD METHOD TO DISABLE MARGINING.

AN IMPROVED METHOD OF TYING THE MGN PIN TO A VOLTAGE DIVIDER

WITH 50k RESISTORS FROM V

IN

TO GROUND IS RECOMMENDED NOW.

DATE

J. Wu

M. Xie

3/7/07

TITLE

TECHNOLOGY

LTM4616EV

Dual 8A High Density Step-Down Power Module

SIZE

CAGE CODE

SCALE:

FILENAME:

DWG NO

DC1245A

SHEET

1

OF

REV

A

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

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

1

DEMO MANUAL DC1245A

dc1245afa

5

参数名称	属性值
类别
厂商名称	ADI(亚德诺半导体)
系列	µModule®
包装	盒
主要用途	DC/DC，步降
输出和类型	2，非隔离
电压 - 输出	1.2V，1.8V
电流 - 输出	8A，8A
电压 - 输入	2.7V ~ 5.5V
稳压器拓扑	降压
频率 - 开关	1.5MHz
板类型	完全填充
所含物品	板
使用的 IC/零件	LTM4616
基本产品编号	DC1245

DC1245A

DC1245A在线购买

DC1245A概述

DC1245A规格参数

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