1 Features

• AEC-Q100 qualified for automotive applications:

– Temperature grade 1: –40°C to +125°C, TA

• Functional Safety-Capable

– Documentation available to aid functional safety

system design

• Input voltage range from 3V to 36V

• RESET output with filter and delayed release

• Designed for low EMI:

– CISPR 25 class 5 compliant EVM

– Pin-configurable spread spectrum

– Adjustable SW node rise time

– Above and below AM band operation: pin

configurable 400kHz and 2.2MHz fixed or

adjustable from 200kHz – 2.2MHz

– Low EMI symmetrical pinout

– Light load mode is pin-configurable for constant

frequency or pulse frequency modulation (PFM)

• High-efficiency design

– 95% efficient for an 8A load

– 5μA input current while unloaded in auto mode

– < 1μA shutdown current (typical)

• Thermally enhanced package enabling top-side

cooling

• High power density

– Built-in compensation, soft start, current limit,

thermal shutdown, and UVLO

– 4.5mm × 3.5mm wettable flank QFN package

2 Applications

• Automotive infotainment

• Instrument cluster

• Advanced Driver Assistance Systems (ADAS)

3 Description

The LM614xxT-Q1 buck converters are automotivefocused

regulators providing adjustable output voltage

which can be set from 1V to 95% of expected

input voltage. These regulators operate under a wide

input voltage range of 3V to 36V and have transient

tolerance up to 42V.

The family is designed for low EMI. The device

incorporates pin selectable spread spectrum, and an

adjustable SW node rise time. Dual Random Spread

Spectrum (DRSS) frequency hopping is set to ±4%

(typical), drastically reducing peak emissions through

a combination of triangular and pseudorandom

modulation, and includes advanced techniques to

reduce output voltage ripple caused by spread

spectrum modulation.

An open-drain RESET output, with filtering and

delayed release, gives a true indication of system

status. In auto mode, the device automatically

transitions between Fixed frequency Pulse Width

Modulation (FPWM) and Pulse Frequency Modulation

(PFM) modes of operation, allowing an unloaded

current consumption of only 5μA (typical). Electrical

characteristics are specified over a junction

temperature range of –40°C to +150°C.