Datasheet

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+
15PVDD
19
17
BST
16
12NEG
14
PGND
13
11POS
UCD7230
SLUS741D –NOVEMBER 2006–REVISED JANUARY 2010 www.ti.com
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, mCs, 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
SIMPLIFIED APPLICATION DIAGRAMS
Figure 1. Single-Phase Synchronous Buck Converter using UCD9112 and one UCD7230
2 Copyright © 2006–2010, Texas Instruments Incorporated
Product Folder Link(s): UCD7230