August 2016

© 2016 Fairchild Semiconductor Corporation

www.fairchildsemi.com

FAN53528

• Rev. 1.2

FAN53528

3.0 A, 2.4 MHz, Digitally Programmable Buck Regulator

Features

(WLCSP)

Applications

ARMADA™, Krait™, etc.

Description

The FAN53528 is a step-down switching voltage

regulator that delivers a digitally programmable output

from an input voltage supply of 2.5 V to 5.5 V. The

output voltage is programmed through an I

capable of operating up to 3.4 MHz.

Using a proprietary architecture with synchronous

rectification, the FAN53528 is capable of delivering

3.0 A continuous at over 80% efficiency, maintaining

that efficiency at load currents as low as 10 mA. The

regulator operates at a nominal fixed frequency of

2.4 MHz, which reduces the value of the external

components. Additional output capacitance can be

added to improve regulation during load transients

without affecting stability.

At

moderate

and

light

loads,

Pulse

Frequency

Modulation (PFM) is used to operate in Power-Save

Mode with a typical quiescent current of 50 µA at room

temperature. 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 fixed frequency is desired.

The FAN53528 is available in a 15-bump, 1.310 mm x

2.015 mm, 0.4 mm ball pitch WLCSP.

FAN53528

SW

L1

PVIN

PGND

VOUT

AGND

LOAD

VSEL

SCL

SDA

EN

Figure 1.

Typical Application

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Ordering Information

Part Number

Power-Up Defaults

EN Delay

Temperature

Range

Package

Packing

Method

Device

Marking

VSEL0

VSEL1

FAN53528BUC08X

0.4

0.6

No

-40 to 85°C

WLCSP

Tape & Reel

FX

FAN53528DUC40X

0.6

0.9

No

FY

FAN53528GUC48X

0.65

0.7

No

FZ

FAN53528EUC48X

0.65

0.7

5ms

FW