FAN5632 View Datasheet(PDF) - Fairchild Semiconductor

Part Name

Description

Manufacturer

FAN5632

Regulated Step-Down Charge Pump DC/DC Converter

Fairchild Semiconductor 

October 2007

FAN5631 / FAN5632

Regulated Step-Down Charge Pump DC/DC Converter

Features

ƒ 90% Peak Efficiency

ƒ Low EMI

ƒ Low Ripple

ƒ Selectable Output Voltage:1.2V/1.5V for FAN5631

ƒ Efficiency Optimizer Feature for FAN5632

ƒ Input Voltage Range: 2.2V to 5.5V

ƒ Output Current: Up to 250mA

ƒ ±5% Output Voltage Accuracy

ƒ 30µA Operating Current

ƒ ICC<1mA in Shutdown Mode

ƒ 1.5MHz Operating Frequency

ƒ Shutdown Isolates Output from Input

ƒ Soft-Start Limits Inrush Current

ƒ Short-Circuit and Over-Temperature Protection

ƒ Minimum External Component Count

ƒ 10-Lead 3x3mm MLP Package

Applications

ƒ Cell Phones

ƒ Handheld Computers

ƒ Portable Electronic Equipment

ƒ Core Supply to Next-Generation Processors

ƒ Low-Voltage DC Bus

ƒ Digital Cameras

ƒ DSP Supplies

Description

The FAN5631/FAN5632 is an advanced, third-

generation switched capacitor step-down DC/DC

converter utilizing Fairchild's proprietary ScalarPump

technology. This innovative architecture utilizes scalar

switch re-configuration and fractional switching

techniques to produce low output ripple, lower ESR

spikes, and improve efficiency over a wide load range.

The FAN5631/FAN5632 produces a fixed regulated

output voltage from an input voltage of 2.2V to 5V.

To maximize efficiency, the FAN5631/5632 achieves

regulation by skipping pulses. Depending on load

current, the size of the switches are scaled dynamically;

consequently, current spikes and EMI are minimized.

An internal soft-start circuitry prevents excessive current

from the supply. The device is internally protected

against short-circuit and over-temperature conditions.

The FAN5631 has a dual-output voltage feature. When

VSEL is high, VOUT is 1.5V; and when VSEL is low, VOUT is

1.2V.

The FAN5632 has an efficiency optimizer feature that,

when enabled, changes the switch mode configuration

from 2:1 to 1:1 at the lower threshold of VIN. The

efficiency is maintained at its peak level over a wider

range of input voltages. In addition, VOUT varies from

1.2V to 1.5V as a result of this efficiency optimization. If

the efficiency optimizer is not enabled, VOUT is regulated

to 1.5V.

Both the FAN5631 and FAN5632 are available in a 10-

lead 3x3mm MLP package.

Ordering Information

Part Number

Package

FAN5631MPX

10-Lead 3x3mm Molded Leadless Package (MLP)

FAN5632MPX

10-Lead 3x3mm Molded Leadless Package (MLP)

All packages are lead free per JEDEC: J-STD-020B standard.

© 2006 Fairchild Semiconductor Corporation

FAN5631/FAN5632 Rev. 1.0.2

Packing Method

Tape and Reel

Tape and Reel

www.fairchildsemi.com

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