Texas Instruments LM68625-Q1 Bedienungsanleitung

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LM686x5-Q1 65V, 2.5A/3.5A/4.5A, Automotive Synchronous Buck DC/DC Converters

With Low-EMI Switcher Technology Optimized for Functional Safety Applications

1 Features

•AEC-Q100 qualified for automotive applications:

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

ambient operating temperature

•Functional Safety-Compliant

–Documentation available to aid ISO 26262

system designs per IEC TR 62380

–Systematic capability up to ASIL D

–Hardware capability up to ASIL C

–Analog built-in-self-test at start-up

–Redundant and fast (0.35μs) V

OUT

monitor

–Feedback path failure detection

–Redundant temperature sensor

–Excellent pin FMEA and pin spacing

•Wide input voltage range: 3V to 65V (70V

transient)

–Meets LV148 / ISO 21780 requirements

•Designed for low EMI

–Facilitates CISPR 25 Class 5 compliance

–±5% dual-random spread spectrum

–Enhanced HotRod

™

QFN package

–Switching frequency from 300kHz to 2.2MHz

–Pin-configurable AUTO or FPWM operation

–Internal compensation, current limit, and OTP

•Low minimum on time: 40ns (maximum)

–Enables 36V

IN

to 3.3V

OUT

at 2.2MHz

•High-efficiency power conversion at all loads

–> 94% peak efficiency at 24V

IN

, 5V

OUT

, 400kHz

–2.5µA switching input current at no load

•High power density

–Compact 3.6mm × 2.6mm, 20-pin eQFN

package with wettable flanks

–Pin compatible with 36V LM65440-Q1,

LM65460-Q1, LM65480-Q1

–θ

JA

= 24°C/W (LM68645-Q1EVM)

•Create a custom design using the LM686x5-Q1

with the WEBENCH

®

Power Designer

LoadCurrent(A)

Efficiency(%)

0.0010.010.1155

40

50

60

70

80

90

100

12V

24V

36V

48V

LM6x645-Q1 Efficiency, VOUT = 5V, FSW = 400kHz

2 Applications

•Advanced driver assistance systems (ADAS)

•Automotive infotainment and cluster

•Hybrid, electric, and powertrain systems

3 Description

The LM686x5-Q1 are a family of automotive buck

converters designed for high efficiency, high-power

density, and ultra-low electromagnetic interference

(EMI). The converters operate over a wide input

voltage range of 3V to 65V (70V transient < 100ms),

reducing the need for external input surge protection.

The LM686x5-Q1 comes with pin selectable fixed

output voltages of 3.3V and 5V or in adjustable

configuration. The low EMI operation is enabled

with minimized loop inductance and optimized switch

node slew rate. The current-mode control architecture

with a 30ns typical minimum on-time allows high

conversion ratios at high frequencies coupled with a

fast transient response and excellent load and line

regulation. Auto mode enables frequency foldback

during light-load operation, allowing an unloaded

current consumption as low as 2.5μA (typical) and

high light-load efficiency, which extends operating run-

time in battery-powered systems.

Device Information

PART

NUMBER

(3)

PACKAGE

(1)

PACKAGE SIZE

(2)

LM68625-Q1,

LM68635-Q1,

LM68645-Q1

RZT (WQFN-FCRLF, 20)2.60mm × 3.60mm

(1)For more information, see Section 7.

(2)The package size (length × width) is a nominal value and

includes pins, where applicable.

(3)See the Device Comparison Table.

Tie FB to VCC or GND

for 5V or 3.3V fixed

output, respectively

V

IN

MODE/SYNC

PGND1

VCC

BST

SW1

FB

BIAS

VIN1

PGND2

VIN2

C

VCC

C

IN1

C

IN2

C

BST

C

OUT

L

O

PG

EN/UVLO

R

UV1

R

UV2

V

OUT

PGOOD

indicator

SYNC

optional

RT

R

RT

COMP

LM686X5-Q1

VSNS

R

FB1

R

VSNS1

R

VSNS2

nFAULT

R

COMP

C

COMP

C

HF

R

FB1

SW2

Simplified Schematic

LM68625-Q1, LM68635-Q1, LM68645-Q1

SNVSCV8B – OCTOBER 2024 – REVISED FEBRUARY 2026

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