LM70860-Q1数据手册TI中文资料规格书

描述 Description

The LM708x0-Q1 is a family of low-IQ, wide-VIN synchronous buck converters designed for an input voltage range of 4.5V to 80V and delivering up to 8A of output current at fixed output voltages of 3.3V, 5V, 12V, or an adjustable output.

The LM708x0-Q1 uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. A pair of LM708x0-Q1 converters can be set up in an interleaved mode (paralleled outputs) with accurate current sharing for applications requiring up to 16A of output current.

The LM708x0-Q1 features a unique Dual Random Spread Spectrum (DRSS) function that combines low-frequency triangular and high-frequency cycle-by-cycle random modulations for improved EMI performance across a wide range of frequency bands.

Additional features of the LM708x0-Q1 include user-selectable diode emulation for lower current consumption at light-load conditions, open-drain Power-Good flag for fault reporting and output monitoring, precision enable input, monotonic start-up into prebiased load, integrated VCC bias supply regulator, internal 2.8ms soft-start time, and thermal shutdown protection with automatic recovery.

The LM708x0-Q1 converter comes in a 6mm × 6mm thermally-optimized, 29-pin QFN package. The three die-attach pads (VIN, SW, and PGND) improve thermal performance and board level reliability (BLR).

特性 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 designs requiring functional safety



Synchronous DC/DC converter with a versatile buck controller and robust power MOSFETs

Wide input voltage range: 4.5V to 80V

Shutdown mode current: 2.3µA

No-load IQ regulating 48V to 5V: 8.2µA

1% accurate, fixed 3.3V, 5V, 12V, or adjustable outputs from 0.8V to 55V

Dual-phase operation enabling output currents up to 16A



Optimized for low EMI requirements

Facilitates CISPR 25 Class 5 compliance

Pin-selectable ±8% dual-random spread spectrum reduces peak emissions

Switching frequency: 200kHz to 2.2MHz

Pin-configurable AUTO or FPWM operation



Inherent protection features for robust design

Internal hiccup-mode overcurrent protection

Enable, power good, and thermal shutdown

Internal or external loop compensation



6mm × 6mm thermally optimized, RoHS compliant, QFN-29 package with Pb-free plating

Create a custom design using the LM708x0-Q1 with WEBENCH Power Designer