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55V wide VIN synchronous 4-switch buck-boost controller

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LM5176RHFT General Description

The LM5176 is a synchronous four-switch buck-boost DC/DC controller capable of regulating the output voltage at, above, or below the input voltage. The LM5176 operates over a wide input voltage range of 4.2 V to 55 V (60-V absolute maximum) to support a variety of applications.

The LM5176 uses current-mode control both in buck and boost modes of operation for superior load and line regulation. The switching frequency is programmed by an external resistor and can be synchronized to an external clock signal.

The device also features a programmable soft-start function and offers protection features including cycle-by-cycle current limiting, input undervoltage lockout (UVLO), output overvoltage protection (OVP), and thermal shutdown. In addition, the LM5176 features optional average input or output current limiting, optional spread spectrum to reduce peak EMI, and optional hiccup mode protection in sustained overload conditions.


Key Features

  • Functional Safety-Capable
    • Documentation available to aid functional safety system design
  • Single inductor buck-boost controller for step-up/step-down DC/DC conversion
  • Wide VIN: 4.2 V (2.5 V with bias) to 55 V (60 V maximum)
  • Flexible VOUT: 0.8 V to 55 V
  • VOUT short protection
  • High efficiency buck-boost transition
  • Adjustable switching frequency
  • Optional frequency sync and dithering
  • Integrated 2-A MOSFET gate drivers
  • Cycle-by-cycle current limit and optional hiccup
  • Optional input or output average current limiting
  • Programmable input UVLO and soft start
  • Power Good and output overvoltage protection
  • Available in HTSSOP-28 and QFN-28 packages
  • Create a custom design using the LM5176 with the WEBENCH Power Designer


Topology Buck-Boost Vin (min) (V) 4.2
Vin (max) (V) 55 Vout (max) (V) 55
Vout (min) (V) 0.8 Duty cycle (max) (%) 100
Switching frequency (min) (kHz) 100 Switching frequency (max) (kHz) 600
Iq (typ) (mA) 2 TI functional safety category Functional Safety-Capable
Features Adjustable current limit, Enable, Frequency synchronization, Power good, Pre-Bias Start-Up, Synchronous Rectification, UVLO adjustable Operating temperature range (°C) -40 to 125
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Ratings and Reviews

H**r Oct 09, 2022

one of the five work and fails acceptance test.Three pictures uploadedgood screen with its bagCorrect screen display (using one of the other 4)good screen display



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Availability: 6526 pieces

Qty. Unit Price(USD) Ext. Price
1+ $6.399 $6.40
250+ $2.476 $619.00
500+ $2.389 $1,194.50
1000+ $2.346 $2,346.00

The prices below are for reference only.