October 2012

© 2010 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN53601 / FAN53611 • Rev. 1.0.1

FAN53601 / FAN53611

6 MHz 600 mA / 1 A Synchronous Buck Regulator

Features

Applications

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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).

Figure 1. Typical Application

Ordering Information

Part Number

Output

Voltage

(1)

Max. Output

Current

Active

Discharge

(2)

Package

Temperature

Range

Packing

FAN53611AUC11X

1.100 V

1 A

Yes

WLCSP-6,

0.4 mm Pitch

–40 to +85°C

Tape and

Reel

FAN53611UC123X

1.233 V

1 A

No

FAN53601UC182X

1.820 V

600 mA

No

Notes:

1.

Other voltage options available on request. Contact a Fairchild representative.

2.

All voltage and output current options are available with or without active discharge. Contact a Fairchild representative.

SW

MODE

GND

EN

L1

2.2 F

470nH

C2

B2

A2

C1

B1

A1

FB

F

VIN