LM25137F-Q1中文资料汽车级 42V、100% 占空比、双通道功能安全同步降压控制器数据手册TI规格书

描述 Description

The LM25137F-Q1 is a 42V, dual-channel, buck controller offered from a family with three options for functional safety: Capable, ASIL B, or ASIL D. The device uses an interleaved, stackable, peak current-mode architecture for easy loop compensation, fast transient response, excellent load and line regulation, and accurate current sharing with paralleled phases for high output current. A high-side switch minimum on-time of 22ns facilitates large step-down ratios, enabling the direct conversion from 12V and 24V automotive inputs to low-voltage rails for reduced system cost and complexity. The LM25137F-Q1 continues to operate during input voltage dips as low as 4V, at 100% duty cycle if needed.

Several features are included to simplify compliance with CISPR 25 and automotive EMI requirements. Adaptively timed, high-current MOSFET gate drivers minimize body diode conduction during switching transitions, reducing switching losses and improving thermal and EMI performance at high input voltage and high switching frequency. To reduce input capacitor ripple current and EMI filter size, 180° interleaved operation is provided for two outputs. A 90° out-of-phase clock output works well for cascaded, multi-channel or multiphase power stages. Resistor-adjustable switching frequency as high as 2.2MHz can be synchronized to an external clock source up to 2.64MHz to eliminate beat frequencies in noise-sensitive applications.

The 1.8µA sleep quiescent current with the output voltage in regulation extends operating run-time in battery-powered automotive systems. Additional features of the LM25137F-Q1 include 150°C maximum junction temperature operation, user-selectable PFM mode for lower current consumption at light-load conditions, configurable soft-start functions, open-drain FAULT and PG flags for fault reporting and output monitoring, independent enable inputs, monotonic start-up into prebiased loads, integrated VCC bias supply regulator powered from VIN or VOUT1, hiccup-mode overload protection, and thermal shutdown protection with automatic recovery. Current is sensed using an optional shunt resistor for high accuracy.

The LM25137F-Q1 controller is qualified to AEC-Q100 grade 1 for automotive applications and comes in a 6mm × 6mm thermally-enhanced, 36-pin VQFN package with additional pin clearance for increased reliability. Also included are wettable flank pins to facilitate optical inspection during manufacturing. The wide input voltage range, low quiescent current consumption, high-temperature operation, cycle-by-cycle current limit, low EMI signature, and small design size provide an excellent point-of-load regulator design for functional safety (FuSa) applications requiring enhanced robustness and durability.

特性 Features

AEC-Q100 qualified for automotive applications:

Device temperature grade 1: –40°C to 125°C ambient operating temperature



Functional Safety-Compliant

Developed for functional safety applications

Three orderable part numbers for Capable, ASIL B, and ASIL D options



Documentation available to aid ISO 26262 system design up to ASIL D

Systematic capability up to ASIL D

Hardware integrity up to ASIL D per IEC62380



Versatile dual synchronous buck DC/DC controller

Wide input voltage range of 4V to 42V

1% accurate, fixed 3.3V, 5V, 12V, or adjustable outputs from 0.8V to 36V

Current monitor output for each channel

Charge-pump gate drivers for 100% duty cycle

No-load sleep current (non- switching) of 1.8µA (typical)

Internal hiccup-mode overcurrent protection



Two interleaved synchronous buck channels

Dual channel or single-output multiphase

Stackable up to four phases



Designed for ultra-low EMI requirements

Dual Random Spread Spectrum (DRSS)

Switching frequency from 100kHz to 2.64MHz



VQFN-36 package with wettable flanks

Create a custom design using the LM25137F-Q1 with WEBENCH Power Designer