CM3708GIT datasheet(2/6 Pages) ETC

Part #	CM3708GIT

Description	3A LOOW NOISE PWM STEP DOWN REGULATOR

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CM3708

3A LOW-NOISE PWM STEP-DOWN REGULATOR

2004/09/15 Rev. 1.2

Champion Microelectronic Corporation

Page 2

PIN DESCRIPTION

Operating Rating

Pin No.

Symbol

Description

Min.

Typ.

Max.

Unit

1,16

VIN1, VIN2

Voltage supply for internal circuits

2

2.5

5

V

2,15

PVIN1, PVIN2

Voltage supply for output power transistors

2

2.5

5

V

3,14

LX1, LX2

Inductor connection to the Drains of the internal

power MOSFETs

5

V

4,13

PGND1, PGND2

Ground for output power transistors

5,9,12

AGND

Ground for internal reference voltage divider

8

AGSEN

Ground for remote sensing

6

SD

Shutdown active high. CMOS input level

0.75 x

VIN

VIN +

0.3V

V

7

VREF

VOUT Set Voltage

1.1

VIN

V

10

NC

No Connection

11

VFB

Feedback node for the VOUT

5

V

BLOCK DIAGRAM

PWM Controller

Oscillator Ramp Generator

Error Amp

Thermal

Protection

MOS

VREF

AGND

12

AGND

7

9

5

VFB

11

PGND1

4

PGND2

13

LX2

14

LX1

3

PVIN2

15

PVIN1

2

SD

6

VIN2

16

VIN1

1

NC

10

AGSEN

8

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