UCC3588_10 Datasheet, PDF (1/15 Pages) Texas Instruments – 5-BIT PROGRAMMABLE OUTPUT BICMOS POWER SUPPLY CONTROLLER

ą
D 5-Bit Digital-to-Analog Converter (DAC)
supports Intel Pentium II
D Microprocessor VID Codes
D Compatible with 5-V or 12-V Systems
D 1% Output Voltage Accuracy Ensured
D Drives 2 N-Channel MOSFETs
D Programmable Frequency to 800 kHz
D Power Good OV / UV / OVP Voltage Monitor
D Undervoltage Lockout and Softstart
Functions
D Short Circuit Protection
D Low Impedance MOSFET Drivers
D Chip Disable
UCC3588
5ĆBIT PROGRAMMABLE OUTPUT BiCMOS
POWER SUPPLY CONTROLLER
SLUS311A – JULY 1999 – REVISED AUGUST 2000
D, J, N AND PW PACKAGES
(TOP VIEW)
VSENSE 1
ISNS 2
SS/ENBL 3
D0 4
D1 5
D2 6
D3 7
D4 8
16 RT
15 VCC
14 DRVLO
13 DRVHI
12 GND
11 PWRGOOD
10 VFB
9 COMP
AVAILABLE OPTIONS
TJ
0°C TO 70°C
D, 16-PIN
UCC3588D
PACKAGED DEVICES
J, 16-PIN
N, 16-PIN
UCC3588J UCC3588N
PW, 16-PIN
UCC3588PW
description
The UCC3588 synchronous step-down (Buck) regulator provides accurate high efficiency power conversion.
Using few external components, the UCC1588 converts 5V to an adjustable output ranging from 3.5 VDC to
2.1 VDC in 100-mV steps and 2.05 VDC to 1.3 VDC in 50-mV steps with 1% dc system accuracy. A high level
of integration and novel design allow this 16-pin controller to provide a complete control solution for today’s
demanding microcontroller power requirements. Typical applications include on board or VRM based power
conversion for Intel Pentium II microprocessors, as well as other processors from a variety of manufacturers.
High efficiency is obtained through the use of synchronous rectification.
The softstart function provides a controlled ramp up of the system output voltage. Overcurrent circuitry detects
a hard (or soft) short on the system output voltage and invokes a timed softstart/shutdown cycle to reduce the
PWM controller on time to 5%.
The oscillator frequency is externally programmed with RT and operates over a range of 50 kHz to 800 kHz.
The gate drivers are low impedance totem pole output stages capable of driving large external MOSFETs. Cross
conduction is eliminated by fixed delay times between turn off and turn on of the external high side and
synchronous MOSFETs. The chip includes undervoltage lockout circuitry which assures the correct logic states
at the outputs during power up and power down.
This device is available in 16-pin surface mount, plastic and ceramic DIP, and TSSOP packages. The UCC3588
is specified for operation from 0°C to 70°C.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
• POST OFFICE BOX 655303 DALLAS, TEXAS 75265
Copyright  2000, Texas Instruments Incorporated
1