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SIMPLIFIED APPLICATION DIAGRAMS

DLY

SRE

AGND

3V3

UCD7230

IN

VDD

DPWMB0

UCD9112

A0

I0

CLF

ILIM

DPWMA0

RB1/TMRI1

OUT1

CSBIAS

SW

6

5

4

2

COMMUNICATION

(Programming&

StatusReporting)

1

VIN

10

7

9

8

OUT2

2

1

3

2

2

ADC2

RB0

AD33

EAP

EAM

VOUT

VOUT

VD25

RST

ADC3

AVSS

2

1

RNEG

RPOS

GSENSE

GSENSE

20

18

CS+

15

PVDD

19

17

BST 16

12

NEG

14

PGND 13

11

POS

UCD7230

SLUS741C – NOVEMBER 2006 – REVISED MARCH 2007

The UCD7230 is a MOSFET gate driver specifically designed for synchronous buck applications. It is ideally

suited to provide the bridge between digital controllers such as the UCD91xx or the UCD95xx and the power

stage. With cycle-by-cycle current limit protection, the UCD7230 device protects the power stage from faulty

input signals or excessive load currents.

The UCD7230 includes high-side and low-side gate drivers which utilize Texas Instrument’s TrueDrive™ output

architecture. This architecture delivers rated current into the gate capacitance of a MOSFET during the Miller

plateau region of the switching. Furthermore, the UCD7230 offers a low offset differential amplifier with a fixed

gain of 48. This amplifier greatly simplifies the task of conditioning small current sense signals inherent in high

efficiency buck converters.

The UCD7230 includes a 3.3-V, 10-mA linear regulator to provide power to digital controllers such as the

UCD91xx. The UCD7230 is compatible with standard 3.3-V I/O ports of the UCD91xx, the TMS320TM family

DSPs,

µCs, or ASICs.

The UCD7230 is offered in PowerPAD™ HTSSOP or space-saving QFN packages. Package pin out has been

carefully designed for optimal board layout

Figure 1. Single-Phase Synchronous Buck Converter using UCD9112 and one UCD7230

2