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FAN53601

6 MHz, 600 mA / 1 A Synchronous Buck Regulator

Fairchild Semiconductor 

October 2015

FAN53601 / FAN53611

6 MHz, 600 mA / 1 A Synchronous Buck Regulator

Features

 600 mA or 1 A Output Current Capability

 24 µA Typical Quiescent Current

 6 MHz Fixed-Frequency Operation

 Best-in-Class Load Transient Response

 Best-in-Class Efficiency

 2.3 V to 5.5 V Input Voltage Range

 Low Ripple Light-Load PFM Mode

 Forced PWM and External Clock Synchronization

 Internal Soft-Start

 Input Under-Voltage Lockout (UVLO)

 Thermal Shutdown and Overload Protection

 Optional Output Discharge

 6-Bump WLCSP, 0.4 mm Pitch

Applications

 3G, 4G, WiFi®, WiMAX™, and WiBro® Data Cards

 Tablets

 DSC, DVC

 Netbooks®, Ultra-Mobile PCs

Description

The FAN53601/11 is a 6 MHz, step-down switching voltage

regulator, available in 600 mA or 1 A options, that delivers a

fixed output from an input voltage supply of 2.3 V to 5.5 V.

Using a proprietary architecture with synchronous

rectification, the FAN53601/11 is capable of delivering a

peak efficiency of 92%, while maintaining efficiency over

80% at load currents as low as 1 mA.

The regulator operates at a nominal fixed frequency of

6 MHz, which reduces the value of the external components

to as low as 470 nH for the output inductor and 4.7 µF for the

output capacitor. In addition, the Pulse Width Modulation

(PWM) modulator can be synchronized to an external

frequency source.

At moderate and light loads, Pulse Frequency Modulation

(PFM) is used to operate the device in Power-Save Mode

with a typical quiescent current of 24 µA. Even with such a

low quiescent current, the part exhibits excellent transient

response during large load swings. At higher loads, the

system automatically switches to fixed-frequency control,

operating at 6 MHz. In Shutdown Mode, the supply current

drops below 1 µA, reducing power consumption. For

applications that require minimum ripple or fixed frequency,

PFM Mode can be disabled using the MODE pin.

The FAN53601/11 is available in 6-bump, 0.4 mm pitch,

Wafer-Level Chip-Scale Package (WLCSP).

All trademarks are the property of their respective owners.

4.7F

MODE A1

L1 SW B1

470nH

FB C1

COUT

A2 VIN

B2 EN

C2 GND

CIN

2.2F

Figure 1. Typical Application

© 2010 Fairchild Semiconductor Corporation

FAN53601 / FAN53611 • Rev. 1.8

www.fairchildsemi.com

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