1 Features

• AEC-Q100 qualified for automotive applications:

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

• Wide input voltage range: 3V to 65V

• Designed for low EMI requirements

– Facilitates CISPR 25 class 5 compliance

– Mode pin configurable ±5% or ±10% dualrandom

spread spectrum reducing peak

emissions

– Enhanced HotRod™ QFN package with

symmetrical pinout

– Switching frequency from 300kHz to 2.2MHz

– Pin-configurable 400kHz and 2.2MHz

– Pin-configurable AUTO or FPWM operation

• Low minimum on time: 40ns (maximum)

– Enables 36V to 3.3V conversion at 2.2MHz

• High-efficiency power conversion at all loads

– > 94% peak efficiency at 24VIN, 5VOUT, 400kHz

– 2.5μA PFM no-load input current

• High power density

– Internal compensation, current limit, and TSD

– 3.6mm × 2.6mm, wettable flank, 20-pin

package

– ϴJA = 25.5°C/W (LM65645-Q1EVM)

• Create a custom design using the LM656x5-Q1

with the WEBENCH® Power Designer

2 Applications

• Advanced Driver Assistance Systems (ADAS)

• Automotive infotainment and cluster

• Hybrid, electric, and powertrain systems

3 Description

The LM656x5-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 tolerant) reducing

the need for external input surge protection. The

LM656x5-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. A pin-selectable ±5% or ±10% dual-random

spread spectrum (DRSS) significantly reduces peak

emissions through a combination of triangular and

pseudo-random modulation while keeping output

voltage ripple very low. 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.