Texas Instruments LM51501-Q1 Bedienungsanleitung

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LM51501-Q1 Wide VIN Automotive Low I

Q

Boost Controller

1 Features

•AEC-Q100 qualified:

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

ambient operating temperature range

–Device HBM ESD classification level 2

–Device CDM ESD classification level C4B

•Functional Safety-Capable

–Documentation available to aid functional safety

system design

•Wide VIN input range from 1.5 V to 42 V when

VOUT ≥ 5 V (65-V absolute maximum)

•Low shutdown current (I

Q

≤ 5 µA)

•Low standby current (I

Q

≤ 15 µA)

•Four programmable output voltage options and

two selectable configurations

–6.0 V, 6.5 V, 9.5 V, or 11.5 V

–Start-stop or e-call configurations

•Adjustable switching frequency from 220 kHz to

2.3 MHz

•Automatic wake-up and standby mode transition

•Optional clock synchronization

•Boost status indicator

•1.5-A peak MOSFET gate driver

•Adjustable cycle-by-cycle current limit

•Thermal shutdown

•16-pin WQFN with wettable and non-wettable flank

options

•Create a custom design using the LM51501-Q1

with the WEBENCH

®

Power Designer

2 Applications

•Automotive start-stop system

•Automotive emergency call system

•Battery-powered boost converters

3 Description

The LM51501-Q1 is a wide input range automatic

boost controller. The device can be used to maintain a

stable output voltage during automotive cranking from

a vehicle battery or from a backup battery.

The LM51501-Q1 switching frequency is programmed

by a resistor from 220 kHz to 2.3 MHz. Fast switching

(≥ 2.2 MHz) minimizes AM band interference and

allows for a small solution size and fast transient

response.

The LM51501-Q1 operates in low I

Q

standby mode

when the input or output voltage is above the preset

standby thresholds and automatically wakes up when

the output voltage drops below the preset wake-up

threshold.

The device transitions in and out of low I

Q

standby

mode to extend battery life at light load. A single

resistor programs the target output regulation voltage

as well as the configuration. Additional features

include low shutdown current, boost status indicator,

adjustable cycle-by-cycle current limit, and thermal

shutdown. A status indicator can be used to control

a circuit to bypass the diode when the part is not

boosting in order to reduce power dissipation. In

E-call mode, the device can be used to control a

disconnect switch to protect the backup-battery.

Device Information

PART NUMBERPACKAGE

(1)

BODY SIZE (NOM)

LM51501-Q1WQFN (16)4.00 mm × 4.00 mm

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

the end of the data sheet.

V

SUPPLY

V

LOAD

CSLO

VIN

VOUT

LM51501

AGND

VCC

COMP

RT

EN

STATUS

VSET

SYNC

AVCC

PGND

Typical Application Circuit

Load Current (A)

Efficiency (%)

00.30.60.91.21.51.82.12.4

70

75

80

85

90

95

100

D008

V

SUPPLY

=7.5V

V

SUPPLY

=6.5V

V

SUPPLY

=5.5V

V

SUPPLY

=4.5V

V

SUPPLY

=3.5V

Efficiency (V

LOAD

= 9.5 V, F

SW

= 440 kHz)

LM51501-Q1

SNVSAZ0C – MARCH 2018 – REVISED OCTOBER 2021

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.

Produktspezifikationen