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3V to 5.5V

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1.2V/2A

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Design

LM26420, LM26420-Q0, LM26420-Q1

SNVS579J – FEBRUARY 2009 – REVISED SEPTEMBER 2015

LM26420/LM26420-Q0/Q1 Dual 2-A Automotive-Qualified, High-Efficiency Synchronous

DC-DC Converter

1 Features

3 Description

The

LM26420

regulator

is

a

monolithic,

high-

1

•

Input Voltage Range of 3 V to 5.5 V

efficiency dual PWM step-down DC-DC converter.

•

Output Voltage Range of 0.8 V to 4.5 V

This device has the ability to drive two 2-A loads with

•

2-A Output Current per Regulator

an internal 75-m

Ω PMOS top switch and an internal

50-m

Ω NMOS bottom switch using state-of-the-art

•

High Switching Frequency: 2.2 MHz (LM26420X)

BICMOS technology results in the best power density

0.55 MHz (LM26420Y)

available. The world-class control circuitry allow on

•

0.8 V, 1.5% Internal Voltage Reference

times as low as 30 ns, thus supporting exceptionally

•

Internal Soft-start

high-frequency conversion over the entire 3-V to 5.5-

V input operating range down to the minimum output

•

Independent Power Good and Precision Enable

voltage of 0.8 V.

for Each Output

•

Current Mode, PWM Operation

Although the operating frequency is high, efficiencies

up to 93% are easy to achieve. External shutdown is

•

Thermal Shutdown

included, featuring an ultra-low standby current. The

•

Overvoltage Protection

LM26420 utilizes current-mode control and internal

•

Start-up into Pre-biased Output Loads

compensation to provide high performance regulation

over a wide range of operating conditions.

•

Regulators are 180° Out of Phase

•

LM26420-Q0: AEC-Q100 Grade 0 (Q0) Qualified

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM26420-Q1: AEC-Q100 Grade 1 (Q1) Qualified

HTSSOP (20)

6.50 mm x 4.40 mm

LM26420

WQFN (16)

4.00 mm x 4.00 mm

•

Compliant with CISPR25 Class 5 Conducted

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

Emissions

the end of the data sheet.

2 Applications

space

•

Local 5 V to Vcore of FPGAs

space

•

Core Power in HDDs and Set-Top Boxes

•

USB Powered Devices

•

Powering Core and I/O Voltages for CPUs and

ASICs

•

Automotive Camera, Infotainment, and Clusters

space

LM26420 Dual Buck DC-DC Converter

LM26420 Efficiency (Up to 93%)

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.