LM26480

LDO1_FB

VOUTLDO2

GND_L

VOUTLDO1

ENLDO1

LDO2_FB

VIN1

SW1

FB1

VINLDO2

SW2

FB2

VIN2

GND_SW2

10 µF

ENSW1

2.2 µH

ENSW2

GND_SW1

VINLDO1

SYNC

nPOR

ENLDO2

GND_C

AVDD

VINLDO12

R1

R2

0.47 µF

0.47 µF

1 µF

R2

R1

1 µF

10 µF

R2

C2

C1

R1

R1

10 µF

2.2 µH

10 µF

1 µF

R2

C1

C2

1 µF

100 k

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DAP

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LM26480

SNVS543K – JANUARY 2008 – REVISED JANUARY 2015

LM26480 Externally Programmable Dual High-Current Step-Down DC-DC and Dual Linear

Regulators

1 Features

2 Applications

1

•

Input Voltage: 2.8 V to 5.5 V

•

Core Digital Power

•

Compatible with Advanced Applications

•

Applications Processors

Processors and FPGAs

•

Peripheral I/O Power

•

Two LDOs for Powering Internal Processor

3 Description

Functions and I/Os

The

LM26480

is

a

multi-functional

Power

•

Precision Internal Reference

Management Unit, optimized for low-power digital

•

Thermal Overload Protection

applications.

This

device

integrates

two

highly

•

Current Overload Protection

efficient 1.5-A step-down DC-DC converters and two

•

External Power-On-Reset Function for Buck1 and

300-mA linear regulators.

Buck2

Device Information(1)

•

Undervoltage Lockout Detector to Monitor Input

PART NUMBER

PACKAGE

BODY SIZE (NOM)

Supply Voltage

LM26480

WQFN (24)

4.00 mm x 4.00 mm

•

Step-Down DC-DC Converter (Buck)

(1) For all available packages, see the orderable addendum at

–

1.5-A Output Current

the end of the datasheet.

–

space

–

Buck1 : 0.8 V to 2 V at 1.5 A

space

–

Buck2 : 1 V to 3.3 V at 1.5 A

space

–

Up to 96% efficiency

–

±3% FB voltage accuracy

space

–

2-MHz PWM switching frequency

Simplified Schematic

–

PWM-to-PFM Automatic Mode Change under

Low Loads

–

Automatic Soft Start

•

Linear Regulators (LDO)

–

–

±3% FB Voltage Accuracy

–

300-mA Output Current

–

25-mV (typ) Dropout

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.