1 Features
• AEC-Q100 qualified for automotive applications
– Device temperature grade 1: –40°C to +125°C
ambient operating temperature
• Functional Safety-Capable
– Documentation available to aid functional safety
system design
• Versatile synchronous buck DC/DC converter
– Wide input voltage range of 3 V to 36 V with
tolerance for load-dump transients up to 42 V
– 1% accurate, fixed 3.3-V, 5-V, or adjustable
output voltage from 1 V to 95% VIN
– 150°C maximum junction temperature
– Fixed 2.1-MHz switching frequency (adjustable
from 200 kHz to 2.2 MHz using a SYNC signal)
• Improved reliability with optimized pinout design
and clearance for short-circuit-to-adjacent-pin test
• Optimized for low EMI requirements
– Enhanced HotRod™ QFN package with dual
input paths reduces switch-node ringing
– Pin-configurable spread spectrum modulation
– Selectable FPWM or PFM mode at light loads
• High efficiency across the full load range
– 92.5% at 13.5 VIN, 5 VOUT, 6 A, 2.1 MHz
– No-load input current: 7-μA typical at 3.3 VOUT
– Shutdown quiescent current: 0.6-μA typical
– 0.6-V typical dropout at 6-A load
– External bias option for improved efficiency
• Create a custom regulator design using the
LM64460-Q1 with WEBENCH® Power Designer

2 Applications
• Automotive infotainment and cluster: head unit,
media hub, USB charge, display
• Automotive ADAS and body electronics

3 Description
The LM64460-Q1 derives from a family of automotive
synchronous buck DC/DC converters with excellent
efficiency and ultra-low IQ. With integrated high-side
and low-side MOSFETs, up to 6 A of output current is
delivered over a wide input voltage range from 3 V to
36 V, with support for load-dump transients up to 42 V.
The converter implements soft recovery from dropout
to eliminate overshoot on the output.
The LM64460-Q1 incorporates numerous features
for excellent EMI performance, including spreadspectrum
frequency modulation, a low-EMI Enhanced
HotRod QFN package that mitigates switch-node
ringing, and a symmetrical pinout for ideal input
capacitor placement. The switching frequency is
synchronizable between 200 kHz and 2.2 MHz to
avoid sensitive frequency bands, while optimizing
efficiency or design size based on the specific
requirements of the application.
PFM mode enables frequency foldback during
light-load operation, allowing an unloaded current
consumption of only 7 μA (typical) and high light-load
efficiency. A seamless transition between PWM and
PFM modes, along with low MOSFET on-resistances
and an external bias input, provides exceptional
efficiency and thermal performance across the entire
load range. The package has several NC pins
between critical power pins, which improve the Failure
Modes and Effects Analysis (FMEA) result.