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STMicroelectronics L5988D

4 A continuous (more than 5 A pulsed) step-down switching


TopologyBuck Converter
Input voltage2.9-18 V
Switching frequency360-440 kHz
Output 12.9 V / 4 A


The L5988D is a monolithic step down power switching regulator able to deliver a continuos output current of 4 A to the load in most of the application conditions limited only by the thermal performance . The device is able to deliver more than 5 A to the load for a maximum time which is dependent on the thermal impedance of the system and the specific operating conditions.

The input voltage can range from 2.9 V to 18 V. The device is capable of 100% duty cycle operation thanks to the embedded high side PMOS switch which doesn’t need external bootstrap capacitor to be driven.

The internal switching frequency is adjustable by external resistor and can be set continuously from 100 kHz to 1 MHz. The L5988D can also be synchronized to an external frequency signal driven to the SYNCH pin I/O pin.


  • 4 A output current (more than 5 pulsed)
  • Operating input voltage from 2.9 V to 18 V
  • External 1.8 V ± 2% reference voltage
  • Output voltage from 0.6 to input voltage
  • MLCC compatible
  • 200 ns TON
  • Programmable UVLO matches 3.3 V, 5 V and
  • 12 V bus
  • FSW programmable up to 1 MHz
  • Voltage feed-forward
  • Zero-load current operation
  • Programmable current limit on both switches
  • Programmable sink current capability
  • Pre-bias start up capability
  • Thermal shutdown

Typical applications

  • HC LED driving
  • Industrial: DC-DC modules, factory automation
  • Networking: XDSL, modems, routers and
  • Computer and peripherals: printers, audio /
  • Consumer: STB, DVD, LCD TV, VCR, car