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FAN53541

2.4 MHz, 5 A TinyBuck™ Synchronous Buck Regulator

ON Semiconductor 

May 2017

FAN53541

2.4 MHz, 5 A TinyBuck™ Synchronous Buck Regulator

Features

 2.4 MHz Fixed-Frequency Operation

 Best-in-Class Load Transient Response

 5 A Output Current Capability

 2.7 V to 5.5 V Input Voltage Range

 Adjustable Output Voltage: 0.8 V to 90% of VIN

 PFM Mode for High Efficiency in Light Load

(Forced PWM Available on MODE Pin)

 50 µA Typical Quiescent Current in PFM Mode

 External Frequency Synchronization

 Low Ripple Light-Load PFM Mode with Forced

PWM Control

 Power Good Output

 Internal Soft-Start

 Input Under-Voltage Lockout (UVLO)

 Thermal Shutdown and Overload Protection

 No External Compensation Required

 20-Bump WLCSP

Applications

 Set-Top Box

 Hard Disk Drive

 Communications Cards

 DSP Power

Description

The FAN53541 is a step-down switching voltage regulator

that delivers an adjustable output from an input voltage

supply of 2.7 V to 5.5 V. Using a proprietary architecture with

synchronous rectification, the FAN53541 is capable of

delivering 5 A at over 90% efficiency, while maintaining a

very high efficiency of over 80% at load currents as low as

2 mA. The regulator operates at a nominal fixed frequency of

2.4 MHz, which reduces the value of the external

components to 470 nH for the output inductor and 20 µF for

the output capacitor. Additional output capacitance can be

added to improve regulation during load transients without

affecting stability and inductance up to 1.2 µH may be used

with additional output capacitance.

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 50 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 2.4 MHz. In shutdown mode, the supply current

drops below 1 µA, reducing power consumption. PFM mode

can be disabled if constant frequency is desired. The

FAN53541 is available in a 20-bump 1.96 mm x 1.56 mm

Wafer-Level Chip-Scale Package (WLCSP).

CIN

10µF

VIN

CIN1

10nF

FAN53541

EN

MODE

PGOOD

SW L1

0.47H

GND

COUT

10µF

VOUT

FB

R1

COUT

10µF

Figure 1. Typical Application

Ordering Information

Part Number Temperature Range

Package

FAN53541UCX

-40 to 85°C

20-Ball Wafer-Level, Chip-Scale Package (WLCSP),

4x5 Array, 0.4 mm Pitch, 250 µm Ball

Packing Method

Tape and Reel

© 2013 Semiconductor Components Industries, LLC.

FAN53541 • Rev. 1.1

www.fairchildsemi.com

www.onsemi.com

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