April 2010

© 2009 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN4860 • Rev. 1.0.3

FAN4860

3MHz, 5V Output Synchronous TinyBoost™ Regulator

Features

Operates with Very Small External Components:

1

μH Inductor and 0402 Case Size Input and Output

Capacitors

Input Voltage Range from 2.3V to 4.5V

Fixed 5.0V Output Voltage

Up to 92% Efficient

Low Operating Quiescent Current

True Load Disconnect During Shutdown

Variable On-time Pulse Frequency Modulation (PFM) with

Light-Load Power-Saving Mode

Internal Synchronous Rectifier

(No External Diode Needed)

Thermal Shutdown and Overload Protection

6-Pin 2 x 2mm UMLP

6-Bump WLCSP, 0.4mm Pitch

Applications

USB “On the Go” 5V Supply

HDMI 5V Supply

5V Supply for H-Bridge Motor Drivers

Powering 5V Peripherals

Supply Source for WLED Torch and Flash Lighting

PDAs, Portable Media Players

Cell Phones, Smart Phones, Portable Instruments

Description

The FAN4860 is a low-power boost regulator designed to

provide a regulated 5V output from a single cell Li-Ion

battery. The output voltage is fixed at 5.0V with a guaranteed

which maximizes battery life.

Light-load PFM operation is automatic and “glitch-free”. The

regulator maintains output regulation at no-load with 37µA

quiescent current.

The combination of built-in power transistors, synchronous

rectification, and low supply current make the FAN4860 ideal

for battery powered applications.

The FAN4860 is available in 6-bump 0.4mm pitch Wafer-

Level Chip Scale Package (WLCSP) and a 6-lead 2x2mm

ultra-thin MLP package.

Figure 1. Typical Application

Ordering Information

Part Number

Operating Temperature Range

Package

Packing Method

FAN4860UC5X

-40°C to 85°C

WLCSP, 0.4mm Pitch

Tape and Reel

FAN4860UMP5X

-40°C to 85°C

UMLP-6, 2 x 2mm

Tape and Reel

.