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LM517701
  • LM517701
  • LM517701
  • LM517701
  • LM517701
  • LM517701

LM517701

ACTIVE

78V wide-VIN bidirectional 4-switch buck-boost controller

Texas Instruments LM517701 Product Info

1 April 2026 5

Parameters

Rating

Catalog

Topology

Buck-Boost

Vin (max) (V)

78

Vin (min) (V)

2.8

Vout (max) (V)

78

Vout (min) (V)

3.3

Features

Adjustable current limit, Dynamic voltage scaling, Enable, Frequency synchronization, Light-load efficiency, Load Disconnect, Power good, Spread Spectrum, Synchronous rectification, Tracking, UVLO adjustable

EMI features

Frequency Dithering, Spread Spectrum

Duty cycle (max) (%)

100

Iq (typ) (A)

0.00006

Operating temperature range (°C)

-40 to 125

Package

HTSSOP (DCP)-38-62.08 mm² 9.7 x 6.4

Features

  • Wide input range from 3.5V to 78V (85V absolute maximum)
    • Minimum 2.8V when V(BIAS) > 3.5V
  • Output voltage from 3.3V to 78V
  • Low shutdown IQ of 3µA
  • Low operating IQ of 60µA
  • 3% reverse current limit accuracy for precise charging currents
  • Average input and output current monitor or limiter
  • Dynamic output voltage tracking for PWM or analog input signals
  • Power save mode (PSM) selectable for high light load efficiency
  • Two integrated high-voltage supply LDOs with automatic selection
  • Fixed frequency across all operating modes (boost, buck-boost, buck)
    • Forced PWM mode selectable
    • Switching up to 1.8MHz for small solution and component size
    • External clock synchronization
  • Spread spectrum operation selectable
  • Adjustable undervoltage protection
  • Hiccup overcurrent and short protection
  • Wide input range from 3.5V to 78V (85V absolute maximum)
    • Minimum 2.8V when V(BIAS) > 3.5V
  • Output voltage from 3.3V to 78V
  • Low shutdown IQ of 3µA
  • Low operating IQ of 60µA
  • 3% reverse current limit accuracy for precise charging currents
  • Average input and output current monitor or limiter
  • Dynamic output voltage tracking for PWM or analog input signals
  • Power save mode (PSM) selectable for high light load efficiency
  • Two integrated high-voltage supply LDOs with automatic selection
  • Fixed frequency across all operating modes (boost, buck-boost, buck)
    • Forced PWM mode selectable
    • Switching up to 1.8MHz for small solution and component size
    • External clock synchronization
  • Spread spectrum operation selectable
  • Adjustable undervoltage protection
  • Hiccup overcurrent and short protection

Description

The LM51770x is a four switch buck-boost controller. The device provides a regulated output voltage if the input voltage is higher, equal, or lower than the adjusted output voltage. In power save mode, the device supports high efficiency with low output loads due to its low quiescence currents. In power save mode, the device supports high efficiency close to 99% efficiency over the full range of the output current. The LM51770x runs at a fixed switching frequency, which is set through the RT or SYNC pin. The switching frequency remains the same during buck, boost, and buck-boost operation. The integrated and optional average current monitor helps monitor and limit input and output current of the LM51770x. This feature also supports charging backup power elements, like batteries or capacitors, with constant current (CC) and constant voltage (CV).

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