2.95-5.5V, 12A, Voltage Mode Synchronous Buck Regulator with Adjustable Frequency


Product details


Vin (Min) (V) 2.95 Vin (Max) (V) 5.5 Vout (Min) (V) 0.6 Vout (Max) (V) 5.5 Iout (Max) (A) 12 Iq (Typ) (mA) 1.5 Switching frequency (Min) (kHz) 300 Switching frequency (Max) (kHz) 1500 Features Enable, Power Good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Operating temperature range (C) -40 to 125 Rating Catalog Regulated outputs (#) 1 open-in-new Find other Buck converters (integrated switch)

Package | Pins | Size

HTSSOP (PWP) 20 42 mm² 6.5 x 6.4 open-in-new Find other Buck converters (integrated switch)


  • Integrated 7-mΩ High Side and 4.3-mΩ Low-Side FET Switches
  • 300-kHz to 1.55-MHz Resistor-Adjustable Frequency
  • Adjustable Output Voltage from 0.6 V to VIN (100% Duty Cycle Capable), ±1% Reference
  • Input Voltage Range 2.95 V to 5.5 V
  • Startup Into Prebiased Loads
  • Output Voltage Tracking Capability
  • Wide Bandwidth Voltage Loop Error Amplifier
  • Adjustable Soft-Start With External Capacitor
  • Precision Enable Pin With Hysteresis
  • Integrated OVP, OCP, OTP, UVLO, and Power-Good
  • Thermally Enhanced 20-Pin HTSSOP Exposed Pad Package
  • Create a custom design using the LM21212-2 with the WEBENCH® Power Designer

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The LM21212-2 is a monolithic synchronous buck regulator that is capable of delivering up to 12 A of continuous output current while producing an output voltage down to 0.6 V with outstanding efficiency. The device is optimized to work over an input voltage range of 2.95 V to 5.5 V, making it suitable for a wide variety of low voltage systems. The voltage mode control loop provides high noise immunity and narrow duty-cycle capability, and it can be compensated to be stable with any type of output capacitance, providing maximum flexibility and ease of use.

The LM21212-2 features internal overvoltage protection (OVP) and overcurrent protection (OCP) for increased system reliability. A precision enable pin and integrated UVLO allow turnon of the device to be tightly controlled and sequenced. Start-up inrush currents are limited by both an internally fixed and externally adjustable soft-start circuit. Fault detection and supply sequencing are possible with the integrated power good circuit.

The LM21212-2 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track an external voltage rail using the SS/TRK pin. The switching frequency can be programmed between 300 kHz and 1.55 MHz with an external resistor.

If the output is prebiased at start-up, it does not sink current, allowing the output to smoothly rise past the prebiased voltage. The regulator is offered in a 20-pin HTSSOP package with an exposed pad that can be soldered to the PCB, eliminating the need for bulky heat sinks.

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LM21212-1 ACTIVE 2.95-5.5V, 12A, Voltage Mode Synchronous Buck Regulator with Frequency Synchronization 5.5 Vin, 12 A with frequency synchronization pin.

Technical documentation

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Type Title Date
* Datasheet LM21212-2 2.95-V to 5.5-V, 12-A, Voltage-Mode Synchronous Buck Regulator With Adjustable Frequency datasheet (Rev. B) Jun. 03, 2019
Selection guides Buck Converter Quick Reference Guide (Rev. A) Mar. 31, 2020
Technical articles Minimize the impact of the MLCC shortage on your power application Mar. 29, 2019
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
Technical articles How to optimize your DSP power budget Oct. 03, 2013
User guides AN-2140 LM21212-2 Evaluation Board (Rev. A) May 05, 2013

Design & development

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Hardware development

document-generic User guide

This evaluation board provides a solution to examine the high efficiency LM21212-2 buck switching regulator. The LM21212-2 is capable of driving up to 12A of continuous load current with excellent output voltage accuracy due to its 1% internal reference. The LM21212-2 is capable of down converting (...)

Design tools & simulation

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PSPICE-FOR-TI — 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 (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
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  • Supports simultaneous analysis of multiple products
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LM21212-2 Design Spreadsheet

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