UCD9112 datasheet(5/29 Pages) TI

Part #	UCD9112

Description	DIGITAL DUAL PHASE SYNCHRONOUS BUCK CONTROLLER

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Manufacturer	TI [Texas Instruments]

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UCD9112

SEPEMBER 2006

5

www.ti.com

1.2 PIN ASSIGNMENTS

Figure 1-3. UCD9112 QFN Package Pin Assignments

1.3 PIN FUNCTIONS

Table 1.1 UCD9112 Pin Descriptions

TERMINAL PIN

NAME

NO.

I/O

A/D

DESCRIPTION

ADDR1

1

I

A

ADDR0

2

I

A

Addr1 and Addr0 signals are analog voltage that are sampled when

UCD9112 is released from reset. The voltage levels set the addresses.

See the below section, PMBus Address.

IOUT_0

3

I

A

Phase 0 inductor current, the value is amplified in UCD7230

VIN

4

I

A

Input DC voltage sensing through resistors.

VOUT

5

I

A

Output DC voltage sensing through resistors.

IOUT_1

6

I

A

Phase 1 inductor curren sensing, the value is amplified in UCD7230.

NC

7

-

Open connection.

NC

8

-

Open connection.

DVSS

9

-

DP

Digital ground of IC. This ground should be separate from power ground.

VD25

10

O

P

Internal 2.5V bypass pin for UCD9112. A 1μF ceramic cap must be

connected from VD25 to DVSS.

RST

11

I

-

Pulling high resets the chip. Need a pull-down resistor and a 0.1μF

decoupling capacitor.

DUM

12

-

Connected to analog ground AVSS.

NC

13

-

No connection.

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