Texas Instruments LM5088 Handleiding

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LM5088, LM5088-Q1 Wide Input Range Non-Synchronous Buck Controller

1 Features

•AEC-Q100 qualified with the following results:

–Device temperature grade 1: –40°C to +125°C

ambient operating temperature range

–Device HBM ESD classification level 2

–Device CDM ESD classification level C5

•Emulated current mode control

•Drives external high-side N-channel MOSFET

•Ultra-wide input voltage range from 4.5 V to 75 V

•Low I

Q

shutdown and standby modes

•High duty cycle ratio feature for reduced dropout

voltage

•Spread spectrum EMI reduction (LM5088-1)

•Hiccup timer for overload protection (LM5088-2)

•Adjustable output voltage from 1.205 V with 1.5%

feedback reference accuracy

•Wide bandwidth error amplifier

•Single resistor oscillator frequency setting

•Oscillator synchronization capability

•Programmable soft start

•High voltage, low dropout bias regulator

•Thermal shutdown protection

•16-pin HTSSOP package

2 Applications

•Automotive infotainment

•Automotive USB accessory adapters

•Industrial DC-DC bias and motor drivers

3 Description

The LM5088 high voltage non-synchronous buck

controller features all the necessary functions to

implement an efficient, high-voltage buck converter

using a minimum number of external components.

The LM5088 can be configured to operate over an

ultra-wide input voltage range of 4.5 V to 75 V. This

easy-to-use controller includes a level-shifted gate

driver capable of controlling an external N-channel

buck switch. The control method is based upon peak

current mode control utilizing an emulated current

ramp. The use of an emulated control ramp reduces

noise sensitivity of the pulse-width modulation circuit,

allowing reliable control of very small duty cycles

necessary in high input voltage and low output voltage

applications. The LM5088 switching frequency is

programmable from 50 kHz to 1 MHz.

The LM5088 is available in two versions: The

LM5088-1 provides a ±5% frequency dithering

function to reduce the conducted and radiated EMI,

while the LM5088-2 provides a versatile restart timer

for overload protection. Additional features include

a low dropout bias regulator, tri-level enable input

to control shutdown and standby modes, soft start,

and oscillator synchronization capability. The device

is available in a thermally enhanced 16-pin HTSSOP

package.

Device Information

Part NumberPackage

(1)

Body Size (NOM)

LM5088

HTSSOP (16)5.00 mm × 4.00 mm

LM5088-Q1

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

the end of the datasheet.

BOOT

SW

COMP

FB

RAMP

DITH/RES

VCC

VIN

OUT

CS

CSG

VOUT

EN

HG

GND

L

D

Rs

Q

LM5088

C

DITHER/RESTART

C

IN

C

VCC

C

SS

C

RAMP

R

RAMP

R

RT

R

COMP

C

COMP

C

HF

C

OUT1

C

OUT2

R

FB2

R

FB1

C

BOOT

R

UV2

R

UV1

VIN (4.5 V-75 V)

SS

RT/SYNC

Copyright © 2016, Texas Instruments Incorporated

Simplified Schematic

Typical Application Circuit Efficiency

LM5088, LM5088-Q1

SNVS600J – DECEMBER 2008 – REVISED JUNE 2022

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.

Product specificaties