LMR71915中文资料德州仪器数据手册PDF规格书

1 Features

• Designed for reliability in rugged applications

– Wide input voltage range of 6V to 115V

– Junction temperature range: –40°C to +150°C

– Fixed 3ms internal soft-start timer

– Peak and valley current-limit protection

– Input UVLO and thermal shutdown protection

• Designed for scalable industrial power supplies

and battery packs

– Low minimum on time of 30ns and minimum off

time of 50ns

– Adjustable switching frequency up to 1MHz

– Diode emulation for high light-load efficiency

– Auto mode with low quiescent current (5μA

typical)

– FPWM for Fly-Buck converter capability

– 1μA shutdown quiescent current

– Pin-to-pin compatible with LM5169, LM5168,

LM5164, LM5163, and LM5013

– Similar pinout and functionality to LM5017 and

LM34927

• Integration reduces design size and cost

– COT mode control architecture

– Integrated 0.7Ω NFET buck switch

– Integrated 0.35Ω NFET synchronous rectifier

– 1V internal voltage reference

– No loop compensation components

– Internal VCC bias regulator and boot diode

– Open-drain power-good indicator

– SOIC PowerPAD™-8 integrated circuit package

2 Applications

• Communications – brick power module

• Motor drives, drones

• Industrial battery pack (≥ 10S)

• Battery pack – e-bike, e-scooter, LEV

3 Description

The LMR71915 and LMR71907 synchronous buck

converters are designed to regulate over a wide input

voltage range, minimizing the need for external surge

suppression components. A minimum controllable on

time of 30ns facilitates large step-down conversion

ratios, enabling the direct step-down from a 48V

nominal input to low-voltage rails for reduced system

complexity and design cost. The LMR719xx operates

during input voltage dips as low as 6V, at nearly 100%

duty cycle if needed, making the device an excellent

choice for wide input supply range industrial and high

cell count battery pack applications.

With integrated high-side and low-side power

MOSFETs, the LMR71915 delivers up to 1.5A of

output current and the LMR71907 delivers up to

0.75A of output current. A constant on-time (COT)

control architecture provides nearly constant switching

frequency with excellent load and line transient

response. The LMR719xx is available in FPWM

or auto mode versions. FPWM mode provides

forced CCM operation across the entire load range

supporting isolated Fly-Buck converter applications.

Auto mode enables ultra-low IQ and diode emulation

mode operation for high light-load efficiency.