Packaging information
| Package | Pins VQFN-FCRLF (RYF) | 22 |
| Operating temperature range (°C) -40 to 150 |
| Package qty | Carrier 3,000 | LARGE T&R |
Features for the LM64460-Q1
- AEC-Q100 qualified for automotive
applications
- Device temperature grade 1: –40°C to +125°C ambient operating temperature
- Functional Safety-Capable
- Versatile synchronous buck DC/DC
converter
- Wide input voltage range of 3V to 36V with tolerance for load-dump transients up to 42V
- 4A and 6A options available
- 1% accurate, fixed 3.3V, 5V, or adjustable output voltage from 1V to 95% VIN
- 150°C maximum junction temperature
- Fixed 2.1MHz switching frequency (adjustable from 200kHz to 2.2MHz using a SYNC signal)
- Improved reliability with optimized pinout design and clearance for short-circuit-to-adjacent-pin test
- Designed 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 13.5VIN, 5VOUT, 6A, 2.1MHz
- 7µA typical at 3.3VOUT no-load input current
- 0.6µA typical shutdown quiescent current
- 0.6V typical dropout at full load
- External bias option for improved efficiency
- Create a custom regulator design using the LM644x0-Q1 with WEBENCH Power Designer
Description for the LM64460-Q1
The LM644x0-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 6A of output current is delivered over a wide input voltage range from 3V to 36V, with support for load-dump transients up to 42V. The converter implements soft recovery from dropout to eliminate overshoot on the output.
The LM644x0-Q1 incorporates numerous features for excellent EMI performance, including spread-spectrum frequency modulation, a low-EMI Enhanced HotRod QFN package that mitigates switch-node ringing, and a symmetrical pinout for excellent input capacitor placement. The switching frequency is synchronizable between 200kHz and 2.2MHz 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 7µA (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.