Texas Instruments LMS3655-Q1 Bedienungsanleitung

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LMS3635-Q1 3.5-A, LMS3655-Q1 5.5-A, 36-V Synchronous, 400-kHz Step-Down

Converter

1 Features

•AEC-Q100-qualified for automotive applications

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

ambient operating temperature

–Device HBM classification level 2

–Device CDM classification level C6

•96% Peak efficiency while converting 12 V to 5 V

•Low EMI and minimized switch node ringing

•400-kHz (±10%) fixed switching frequency

•–40°C to +150°C junction temperature range

•External frequency synchronization

•RESET output with internal filter and 3-ms release

timer

•Automatic light load mode for improved efficiency

•Pin-selectable forced PWM mode

•Built-In compensation, soft start, current limit,

thermal shutdown, and UVLO

•0.35-V dropout with 3.5-A Load at 25°C (Typical)

•18-µA I

Q_VIN

: quiescent current at 3.3 V

OUT

and no

load (typical)

•Output voltage: 5 V, 3.3 V, and ADJ (1 V to 20 V)

•±1.5% reference voltage tolerance

•Create a custom design using the LMS3655-Q1

with the WEBENCH

®

Power Designer

2 Applications

•Automotive USB charge

•Driver monitoring

•Surround view system ECU

•Mechanically scanning LIDAR

•Vehicle to vehicle

3 Description

The LMS3635-Q1 and LMS3655-Q1 synchronous

buck regulators are optimized for high performance

applications, providing an output voltage of 3.3 V, 5

V, or an adjustable output of 1 V to 20 V. Seamless

transition between PWM and PFM modes, along with

a low quiescent current, ensures high efficiency and

superior transient responses at all loads.

Advanced high-speed circuitry allows the LMS3655-

Q1 to regulate an input of 24 V to an output of 3.3 V

at a fixed frequency of 400 kHz while also enabling

a continuous load current of 5.5 A. An innovative

frequency foldback architecture allows this device to

regulate a 3.3-V output from an input voltage of only

3.5 V. The input voltage can range up to 36 V, with

transient tolerance up to 42 V, easing input surge

protection design.

An open-drain reset output, with built-in filtering and

delay, provides a true indication of system status.

This feature negates the requirement for an additional

supervisory component, saving cost and board space.

Device Information

DEVICE NAMEPACKAGE

(1)

BODY SIZE

LMS3635-Q1

SON (22)4.00 mm × 5.00 mm

LMS3655-Q1

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

the end of the data sheet.

Output Current (A)

Efficiency

0.0010.010.1110

80%

82%

84%

86%

88%

90%

92%

94%

96%

98%

100%

LMS3

V

IN

= 12

V

IN

= 24

LMS3655-Q1 Efficiency: V

OUT

= 5 V

LMS3655-Q1 Conducted EMI: V

OUT = 5 V

, I

OUT

= 5 A

LMS3655-Q1, LMS3635-Q1

SNAS714C – NOVEMBER 2016 – REVISED AUGUST 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