BOOT

SW

COMP

FB

RAMP

DITH/RES

VCC

VIN

OUT

CS

CSG

VOUT

EN

HG

GND

L

D

Rs

Q

VIN (4.5V-42V)

SS

RT/SYNC

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LM25088, LM25088-Q1

SNVS609J – DECEMBER 2008 – REVISED JANUARY 2015

LM25088, LM25088-Q1 Wide Input Range Non-Synchronous Buck Controller

1 Features

3 Description

The LM25088 high voltage non-synchronous buck

1

•

LM25088Q is an Automotive Grade Product that is

controller features all the necessary functions to

AEC-Q100 Grade 1 Qualified (-40°C to +125°C

implement an efficient high voltage buck converter

Operating Junction Temperature)

using a minimum number of external components.

•

Emulated Current Mode Control

The LM25088 can be configured to operate over an

ultra-wide input voltage range of 4.5 V to 42 V. This

•

Drives External High-Side N-Channel MOSFET

easy to use controller includes a level shifted gate

•

Ultra-Wide Input Voltage Range from 4.5V to 42V

driver capable of controlling an external N-channel

•

buck switch. The control method is based upon peak

•

High Duty Cycle Ratio Feature for Reduced

current mode control utilizing an emulated current

Dropout Voltage

ramp. The use of an emulated control ramp reduces

noise sensitivity of the pulse-width modulation circuit,

•

Spread Spectrum EMI Reduction (LM25088-1)

allowing reliable control of very small duty cycles

•

Hiccup Timer for Overload Protection (LM25088-

necessary in high input voltage/low output voltage

2)

applications. The LM25088 switching frequency is

•

Adjustable Output Voltage from 1.205 V with 1.5%

programmable from 50 kHz to 1 MHz.

Feedback Reference Accuracy

The LM25088 is available in two versions: The

•

Wide Bandwidth Error Amplifier

LM25088-1 provides a +/-5% frequency dithering

function to reduce the conducted and radiated EMI,

•

Single Resistor Oscillator Frequency Setting

while the LM25088-2 provides a versatile restart timer

•

Oscillator Synchronization Capability

for overload protection. Additional features include a

•

Programmable Soft-Start

low dropout bias regulator, tri-level enable input to

•

High Voltage, Low Dropout Bias Regulator

control shutdown and standby modes, soft-start and

oscillator synchronization capability. The device is

•

Thermal Shutdown Protection

available in a thermally enhanced HTSSOP-16 pin

•

Package: HTSSOP 16-Pin

package.

2 Applications

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

•

Automotive Infotainment

LM25088

HTSSOP (16)

5.00 mm × 4.40 mm

•

Automotive USB Accessory Adapters

LM25088-Q1

HTSSOP (16)

5.00 mm × 4.40 mm

•

Industrial DC-DC Bias and Motor Drivers

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

the end of the datasheet.

4 Simplified Schematic

Typical Application Circuit Efficiency

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.