ISL6431CB Intersil, ISL6431CB Datasheet

ISL6431CB

Manufacturer Part Number

ISL6431CB

Description

IC CNTRLR PWM SYNC BUCK 8-SOIC

Manufacturer

Intersil

Datasheet

1.ISL6431CB.pdf (10 pages)

Specifications of ISL6431CB

Pwm Type

Voltage Mode

Number Of Outputs

Frequency - Max

340kHz

Duty Cycle

100%

Voltage - Supply

4.5 V ~ 5.5 V

Buck

Yes

Boost

Flyback

Inverting

Doubler

Divider

Cuk

Isolated

Operating Temperature

0°C ~ 70°C

Package / Case

8-SOIC (3.9mm Width)

Frequency-max

340kHz

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

Current page: 1 of 10
Download datasheet (188Kb)

Advanced Pulse-Width Modulation (PWM)

Controller for Home Gateways

The ISL6431 is a high efficiency, fixed frequency,

synchronous buck PWM controller. It is designed for use in

applications that convert 5V to lower distributed voltages

required for set-top box, cable modem, DSL modem and

residential home gateway core processor, memory and

peripheral power supplies.

This device makes simple work out of implementing a

complete control and protection scheme for a DC-DC

stepdown converter. Designed to drive N-channel MOSFETs

in a synchronous buck topology, the ISL6431 integrates the

control, output adjustment, monitoring and protection

functions into a single 8-pin package.

The ISL6431 provides simple, single feedback loop, voltage-

mode control with fast transient response. The output

voltage can be precisely regulated to as low as 0.8V, with a

maximum tolerance of ±1.5% over temperature and line

voltage variations. A fixed frequency oscillator reduces

design complexity, while balancing typical application cost

and efficiency.

The error amplifier features a 15MHz gain-bandwidth

product and 6V/ s slew rate which enables high converter

bandwidth for fast transient performance. The resulting

PWM duty cycles range from 0% to 100%.

Protection from overcurrent conditions is provided by

monitoring the r

operation appropriately. This approach simplifies the

implementation and improves efficiency by eliminating the

need for a current sense resistor.

Ordering Information

ISL6431CB

ISL6431IB

ISL6431EVAL1

PART NUMBER

DS(ON)

Evaluation Board

TEMP. RANGE

-40 to 85

of the upper MOSFET to inhibit PWM

0 to 70

(

8 Ld SOIC

Data Sheet

PACKAGE

M8.15

PKG.

NO.

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

1-888-INTERSIL or 321-724-7143

Features

• Operates from +5V Input

• 0.8V to V

• Drives N-Channel MOSFETs

• Simple Single-Loop Control Design

• Fast Transient Response

• Lossless, Programmable Overcurrent Protection

• Small Converter Size

• High Conversion Efficiency

• Synchronous/Standard Buck Configuration

Applications

• Cable Modems, Set Top Boxes, and DSL Modems

• DSP and Core Communications Processor Supplies

• Power Supplies for Microprocessors and Embedded

• Memory Supplies

• Personal Computer Peripherals

• Industrial Power Supplies

• 5V-Input DC-DC Regulators

• Low-Voltage Distributed Power Supplies

Pinout

- 0.8V Internal Reference

- ±1.5% Over Line Voltage and Temperature

- Voltage-Mode PWM Control

- Uses Upper MOSFET’s r

- 300kHz Fixed Frequency Oscillator

- Internal Soft Start

- 8 Lead SOIC Package

Controllers

UGATE

LGATE

BOOT

June 2001

GND

Output Range

Intersil and Design is a trademark of Intersil Americas Inc.

DS(ON)

File Number

PHASE

COMP/OCSET

VCC

ISL6431

9018

Related parts for ISL6431CB

ISL6431CB Summary of contents

Page 1

... MOSFET to inhibit PWM DS(ON) operation appropriately. This approach simplifies the implementation and improves efficiency by eliminating the need for a current sense resistor. Ordering Information TEMP. RANGE o PART NUMBER ( C) PACKAGE ISL6431CB SOIC ISL6431IB - SOIC ISL6431EVAL1 Evaluation Board 1 June 2001 Features • Operates from +5V Input • ...

Page 2

Block Diagram SAMPLE + 0. COMP/OCSET 20 A Typical Application COMP/OCSET ISL6431 + - AND OC HOLD COMPARATOR PWM ERROR COMPARATOR AMP + - + ...

Page 3

... Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . 150 Maximum Storage Temperature Range . . . . . . . . . . -65 Maximum Lead Temperature (Soldering 10s 300 (SOIC - Lead Tips Only 125 C TEST CONDITIONS ISL6431CB; UGATE and LGATE Open ISL6431IB; UGATE and LGATE Open ISL6431CB ISL6431IB ISL6431CB ISL6431IB ISL6431CB; VCC = 5V ISL6431IB; VCC = 5V ISL6431CB ISL6431IB ISL6431CB ISL6431IB ISL6431CB ...

Page 4

... OCSET MOSFET ( internal 20 A current source CC OCSET 4 ISL6431 TEST CONDITIONS ISL6431CB ISL6431IB ISL6431CB ISL6431IB ISL6431CB ISL6431IB (I ), and the upper MOSFET on-resistance (r OCSET set the converter overcurrent (OC) trip point according to the following equation: I OCSET ------------------------------------------------- I = PEAK Internal circuitry of the ISL6431 will not recognize a voltage ...

Page 5

OCP sampling and hold operation, the POR function initiates the Soft Start operation. Over Current Protection The overcurrent function protects the converter from a shorted output by using the upper MOSFET’s on-resistance monitor the current. ...

Page 6

V IN ISL6431 UGATE Q 1 PHASE Q 2 LGATE RETURN FIGURE 3. PRINTED CIRCUIT BOARD POWER AND GROUND PLANES OR ISLANDS Figure 3 shows the critical power components of the converter. To minimize the voltage overshoot, the interconnecting wires ...

Page 7

Check Gain against Error Amplifier’s Open-Loop Gain. 7. Estimate Phase Margin - Repeat if Necessary. Compensation Break Frequency Equations 1 F ----------------------------------- - F -------------------------------------------------------- - = = ...

Page 8

The response time to a transient is different for the application of load and the removal of load. The following equations give the approximate response time interval for application and removal of a transient load TRAN t ...

Page 9

ISL6431 DC-DC Converter Application Circuit Figure 8 shows an application circuit of a DC-DC Converter. Detailed information on the circuit, including a complete Bill- of-Materials and circuit board description is available. +5V COMP/OCSET FB 9 ISL6431 + C IN VCC ...

Page 10

... Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate and reliable. How- ever, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries ...

Related keywords

isl6439
isl6420
isl6401
isl6440
isl6420a
isl6442
isl6420b
isl6431
ISL6431CB datasheet
ISL6431CB data sheet
ISL6431CB pdf datasheet
ISL6431CB component
ISL6431CB part
ISL6431CB distributor
ISL6431CB RoHS
ISL6431CB datasheet download