UCC2880-4/-5/-6

UCC3880-4/-5/-6

CONNECTION DIAGRAM

SOIC-20 (Top View)

DW Package

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

Undervoltage Lockout

VIN UVLO Turn-on Threshold

10.5

10.8

V

VIN UVLO Turn-off Threshold

9.5

10

V

UVLO Threshold Hysteresis

500

mV

Supply Current

3.5

mA

DAC/Reference

COMMAND Voltage Accuracy

–1

1

%

D0-D3 Voltage High

DX Pin Floating

5

V

D0-D3 Input Bias Current

DX Pin Tied to GND

–70

–20

µA

VREF Output Voltage

4.975

5

5.025

V

VREF Load Regulation

–10

0

mV

VREF Sourcing Current

VREF = 0V

10

mA

OVP Comparator

Trip Point

% Over COMMAND Voltage

10

15

20

%

Hysteresis

20

30

mV

VSENSE Input Bias Current

OV, OVP, UV Combined

–0.1

µA

Propagation Delay

1

µs

The voltage and current amplifiers have a 4MHz gain

bandwidth product to satisfy high performance system re-

quirements. The internal current sense amplifier permits

the use of a low value current sense resistor, minimizing

power loss. The oscillator frequency is fixed internally at

100kHz, 200kHz, or 400kHz, depending upon the option

selected. The foldback circuit reduces the converter short

circuit current limit to 50% of its nominal value when the

converter is short circuited. The gate driver is a 2

Ω totem

pole output stage capable of driving an external MOSFET.

This device is available in 20-pin dual in-line and surface

mount packages. The UCC2880-x is specified for opera-

tion from –25°C to 85°C, and the UCC3880-x is specified

for operation from 0°C to 70°C.

Pentium® Pro is a registered trademark of Intel Corpora-

tion.

DESCRIPTION (cont.)

Frequency

100kHz

200kHz

400kHz

UCC3880-4

X

UCC3880-5

X

UCC3880-6

X

Frequency Gain Table

ORDERING INFORMATION

Consult factory for temperature range or package options

not shown.

2