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LM5177

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78-V wide VIN synchronous 4-switch buck-boost controller with bidirectional operation

Product details

Topology Buck-Boost Vin (Min) (V) 2.8 Vin (Max) (V) 78 Vout (Max) (V) 78 Vout (Min) (V) 3.3 Duty cycle (Max) (%) 100 Switching frequency (Min) (kHz) 90 Switching frequency (Max) (kHz) 2200 Iq (Typ) (mA) 0.06 Features Adjustable Current Limit, Adjustable UVLO, Dynamic Voltage Scaling, Enable, Frequency Synchronization, Light Load Efficiency, Load Disconnect, Power Good, Spread Spectrum, Synchronous Rectification, Tracking, UVLO Adjustable Rating Catalog
Topology Buck-Boost Vin (Min) (V) 2.8 Vin (Max) (V) 78 Vout (Max) (V) 78 Vout (Min) (V) 3.3 Duty cycle (Max) (%) 100 Switching frequency (Min) (kHz) 90 Switching frequency (Max) (kHz) 2200 Iq (Typ) (mA) 0.06 Features Adjustable Current Limit, Adjustable UVLO, Dynamic Voltage Scaling, Enable, Frequency Synchronization, Light Load Efficiency, Load Disconnect, Power Good, Spread Spectrum, Synchronous Rectification, Tracking, UVLO Adjustable Rating Catalog
HTSSOP (DCP) 38
  • Wide input range from 3.5 V to 78 V (80-V absolute maximum)
    • Minimum 2.8 V when V(BIAS) > 3.5 V
  • Output voltage from 3.3 V to 78 V
  • Low shutdown IQ of 3 µA
  • Low operating IQ of 60 µA
  • 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
  • 2-A peak current logic level gate driver
    • Integrated bootstrap diode
    • Bootstrap overvoltage and undervoltage protection
  • Fixed frequency independent from operating mode (boost, buck-boost, buck)
    • Forced PWM mode selectable
    • Switching up to 2 MHz for small solution and component size
    • External clock synchronization
  • Spread spectrum operation selectable
  • Adjustable undervoltage and overvoltage protection
  • Hiccup overcurrent protection
  • Wide input range from 3.5 V to 78 V (80-V absolute maximum)
    • Minimum 2.8 V when V(BIAS) > 3.5 V
  • Output voltage from 3.3 V to 78 V
  • Low shutdown IQ of 3 µA
  • Low operating IQ of 60 µA
  • 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
  • 2-A peak current logic level gate driver
    • Integrated bootstrap diode
    • Bootstrap overvoltage and undervoltage protection
  • Fixed frequency independent from operating mode (boost, buck-boost, buck)
    • Forced PWM mode selectable
    • Switching up to 2 MHz for small solution and component size
    • External clock synchronization
  • Spread spectrum operation selectable
  • Adjustable undervoltage and overvoltage protection
  • Hiccup overcurrent protection

The LM5177 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 safe mode, the device supports superb efficiency over the full rage of the output current. The LM5177 runs at a fixed switching frequency, which can be 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 can help monitor and limit input and output current of the LM5177. This feature also supports charging backup power elements, like batteries or capacitors, with constant current (CC) and constant voltage (CV).

The LM5177 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 safe mode, the device supports superb efficiency over the full rage of the output current. The LM5177 runs at a fixed switching frequency, which can be 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 can help monitor and limit input and output current of the LM5177. This feature also supports charging backup power elements, like batteries or capacitors, with constant current (CC) and constant voltage (CV).

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Technical documentation

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Type Title Date
* Data sheet LM5177 80-V Wide VIN Bidirectional 4-Switch Buck-Boost Controller datasheet PDF | HTML 02 Jun 2022
User guide LM5177 Buck-Boost Controller Evaluation Module User's Guide PDF | HTML 11 Apr 2022
Certificate LM5177EVM-HP EU RoHS Declaration of Conformity (DoC) 16 Dec 2021

Design & development

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Evaluation board

LM5177EVM-HP — LM5177 wide-VIN, high-power buck-boost controller EVM

The LM5177EVM-HP demonstrates a flexible high power buck-boost design using the LM5177 wide-vin buck-boost controller. The evaluation module is configured to operate from input voltage range of 4.2 V - 36 V and provide a regulated 16-V output with up to 9.4 A of load current.

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Simulation tool

PSPICE-FOR-TI PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Calculation tool

LM5177 BuckBoost Quickstart Calculator Tool LM5177 BuckBoost Quickstart Calculator Tool

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HTSSOP (DCP) 38 View options

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