VIN

GND

2.5 V/2 A

3 V to 5.5 V

Buck 1

Buck 2

1.2 V/2 A

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Design

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.

LM26420, LM26420-Q0, LM26420-Q1

SNVS579K – FEBRUARY 2009 – REVISED APRIL 2016

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

DC-DC Converter

1

1 Features

1

•

Qualified for Automotive Applications

•

AEC Q100-Qualified With the Following Results:

–

Device Temperature Grade 0 (Q0): –40°C to

+150°C Ambient Operating Temperature

Range

–

Device Temperature Grade 1 (Q1): –40°C to

+125°C Ambient Operating Temperature

Range

•

Compliant with CISPR25 Class 5 Conducted

Emissions

•

Input Voltage Range of 3 V to 5.5 V

•

Output Voltage Range of 0.8 V to 4.5 V

•

2-A Output Current per Regulator

•

High Switching Frequency: 2.2 MHz (LM26420X)

0.55 MHz (LM26420Y)

•

0.8 V, 1.5% Internal Voltage Reference

•

Internal Soft Start

•

Independent Power Good and Precision Enable

for Each Output

•

Current Mode, PWM Operation

•

Thermal Shutdown

•

Overvoltage Protection

•

Start-up into Pre-biased Output Loads

•

Regulators are 180° Out of Phase

2 Applications

•

Local 5 V to Vcore of FPGAs

•

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

3 Description

The

LM26420

regulator

is

a

monolithic,

high-

efficiency dual PWM step-down DC-DC converter.

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

an internal 75-m

Ω PMOS top switch and an internal

50-m

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

BICMOS technology results in the best power density

available. The world-class control circuitry allow on

times as low as 30 ns, thus supporting exceptionally

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

V input operating range down to the minimum output

voltage of 0.8 V.

Although the operating frequency is high, efficiencies

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

included, featuring an ultra-low standby current. The

LM26420 utilizes current-mode control and internal

compensation to provide high performance regulation

over a wide range of operating conditions.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

LM26420

HTSSOP (20)

6.50 mm × 4.40 mm

WQFN (16)

4.00 mm × 4.00 mm

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

the end of the data sheet.

LM26420 Dual Buck DC-DC Converter

LM26420 Efficiency (Up to 93%)