LM5137-Q1数据手册TI中文资料规格书

描述 Description

The LM5137-Q1 is an 80V synchronous buck DC/DC 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 15ns facilitates large step-down ratios, enabling the direct conversion from 12V, 24V or 48V automotive inputs to low-voltage rails for reduced system design cost and complexity. The LM5137-Q1 continues to operate during input voltage dips as low as 4V, at 100% duty cycle if needed. The 12.7µA no-load quiescent current with the output voltage in regulation extends operating run-time in battery-powered automotive systems.

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 2.5MHz to eliminate beat frequencies in noise-sensitive applications.

Additional features of the LM5137-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 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 BIAS1/VOUT1, hiccup-mode overload protection, and thermal shutdown protection with automatic recovery. Current is sensed using the inductor DCR for highest efficiency or an optional shunt resistor for high accuracy.

The LM5137-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 and 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 solution for 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-Capable

Documentation available to aid functional safety system design



Functional Safety-Compliant options – ASIL B and ASIL D – available through request (LM5137F-Q1)

Versatile dual synchronous buck DC/DC controller

Wide input voltage range of 4V to 80V

1% accurate, fixed 3.3V, 5V, 12V, or adjustable outputs from 0.8V to 60V

150°C maximum junction temperature

Charge-pump gate drivers for 100% duty cycle



Two interleaved synchronous buck channels

Dual channel or single-output multiphase

Stackable up to four phases

SYNC in and SYNC out capability



Inherent protection features for robust design

Internal hiccup-mode overcurrent protection

Independent ENABLE and PGOOD functions

Adjustable output voltage soft start

VCC and gate-drive UVLO protection

Thermal shutdown protection with hysteresis



Designed for ultra-low EMI requirements

Dual Random Spread Spectrum (DRSS)

Switching frequency from 100kHz to 2.5MHz



VQFN-36 package with wettable flanks

Create a custom design using the LM5137-Q1 with WEBENCH Power Designer