ISL9440 Datasheet

IC型號(hào)：
ISL9440
PDF描述：
Triple, 180∑ Out-of-Phase, Step-Down PWM and Single Linear ...
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INTERSIL

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ISL9440, ISL9440A, ISL9441

Data Sheet

December 5, 2007

FN6383.1

Triple, 180擄 Out-of-Phase, Step-Down

PWM and Single Linear Controller

The ISL9440, ISL9440A and ISL9441 are quad-output

synchronous buck controllers that integrate 3 PWM

controllers and 1 low drop-out linear regulator controller, which

are full featured and designed to provide multi-rail power for

use in products such as cable and satellite set-top boxes,

VoIP gateways, cable modems, and other home connectivity

products as well as a variety of industrial and general purpose

applications. Each output is adjustable down to 0.8V. The

PWMs are synchronized at 180擄 out of phase thus reducing

the RMS input current and ripple voltage.

The ISL9440, ISL9440A and ISL9441 offer internal soft-start,

independent enable inputs for ease of supply rail

sequencing, and integrated UV/OV/OC/OT protections in a

space conscious 5mmx5mm QFN package. The ISL9440

and ISL9440A offer an early warning function to output a

logic signal to warn the system to back up data when input

voltage falls below a certain level.

The ISL9440, ISL9440A and ISL9441 utilize internal loop

compensation to keep minimum peripheral components for

compact design and a low total solution cost. These devices

are implemented with current mode control with feed forward

to cover various applications even with fixed internal

compensations.

The table below shows the difference in terms of ISL9440,

ISL9440A and ISL9441 features.

PART

NUMBER

ISL9440

ISL9440A

ISL9441

EARLY

WARNING

YES

SWITCHING FREQUENCY

(kHz)

300

600

300

Features

鈥?Three Integrated Synchronous Buck PWM Controllers

- Internal Bootstrap Diodes

- Internal Compensation

- Internal Soft-Start

鈥?Independent Control for Each Regulator and

Programmable Output Voltages; Independent

Enable/Shutdown

鈥?Fixed Switching Frequency: 300kHz (ISL9440, ISL9441);

600kHz (ISL9440A)

鈥?Adaptive Shoot Through Protection on all Synchronous

Buck Controllers

鈥?Independently Programmable Voltage Outputs

鈥?Out-of-Phase Switching to Reduce Input Capacitance

(0擄/180擄/0擄)

鈥?No External Current Sense Resistor

- Uses Lower MOSFET鈥檚 r

DS(ON)

鈥?Current Mode Controller with Voltage Feed Forward

鈥?Complete Protection

- Overcurrent, Overvoltage, Undervoltage Lockout,

Over-Temperature

鈥?Cycle by Cycle Current Limiting

鈥?Wide Input Voltage Range

- Input Rail Powers VIN Pin: 5.6V to 24V

- Input Rail Powers VCC_5V Pin (VIN tied to VCC_5V, for

5V input applications): 4.5V to 5.6V

鈥?Early Warning (ISL9440, ISL9440A) on Input Voltage

Failure

鈥?Integrated Reset Function (ISL9440, ISL9440A)

鈥?Pb-free (RoHS compliant)

Applications

鈥?Satellite and Cable Set-Top Boxes

鈥?Cable Modems

鈥?VoX Gateway Devices

鈥?NAS/SAN Devices

Related Literature

鈥?Technical Brief TB389 鈥淧CB Land Pattern Design and

Surface Mount Guidelines for QFN (MLFP) Packages鈥?/div>

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

1-888-INTERSIL or 1-888-468-3774

Intersil (and design) is a registered trademark of Intersil Americas Inc.

All other trademarks mentioned are the property of their respective owners.

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