LM72880-Q1中文资料具有 I2C 的汽车级 80V、8A 同步降压转换器数据手册TI规格书

描述 Description

The LM72880-Q1 is an 80V, ultra-low IQ, synchronous buck converter with constant-current constant-voltage (CC-CV) regulation and I2C interface. The device is designed to work with the TPS2674X-Q1 USB Type-C PD controllers.

The converter uses a peak current-mode control architecture for easy loop compensation, fast transient response, and excellent load and line regulation. The highly accurate CC-CV operation enables seamless transition between constant-current and constant-voltage modes. The I2C interface allows programming of output voltage in 10mV or 20mV steps, average output current limit in 50mA steps, as well as output voltage slew rate, switching frequency, soft-start slew rate, mode of operation, current loop compensation, output active discharge strength, and cable drop compensation gain.

The LM72880-Q1 also features an array of safety features including undervoltage and overvoltage protection with programmable thresholds, overcurrent protection with programmable hiccup mode, and thermal shutdown.

Additional features of the LM72880-Q1 include programmable diode emulation for lower current consumption at light-load conditions, open-drain nINT flag for fault reporting and output monitoring, precision enable input, monotonic start-up into prebiased load, integrated dual input (VIN and VOUTF) VCC supply regulator, and oversized VDDA regulator for powering external loads, such as companion USB PD controllers.

The LM72880-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



Synchronous CC-CV buck converter with I2C

Wide input voltage range: 4.5V to 80V

Meets LV148 / ISO21780 requirements



1% accurate, programmable VOUT from 1V (3.3V) to 24V (48V) in 10mV (20mV) steps

3% accurate, programmable ILIM(avg) from 0.5A (0.8A) to 7.5A (12A) in 50mA (80mA) steps

Output slew rate: 0.5mV/µs to 40mV/µs

Adjustable cable drop compensation

Output active discharge



Designed for pairing with TPS2674X-Q1 USB Type-C PD controllers

Designed for low EMI requirements

Facilitates CISPR 25 Class 5 compliance

±8% dual-random spread spectrum with programmable modulation frequency

Programmable fSW: 200kHz to 2.2MHz

Programmable PFM or FPWM operation



Programmable protection features

UV/OV (PG) warning: ±5% or ±10%

OVP warning, fault: 5% to 36% in 1% steps

Internal hiccup-mode overcurrent protection

Enable, interrupt, and thermal shutdown



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