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) (uA) 1500 Switching frequency (Min) (kHz) 300 Switching frequency (Max) (kHz) 1500 Features Enable, Frequency Synchronization, Power Good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Rating Catalog Regulated outputs (#) 1 Control mode Voltage Mode Duty cycle (Max) (%) 100
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) (uA) 1500 Switching frequency (Min) (kHz) 300 Switching frequency (Max) (kHz) 1500 Features Enable, Frequency Synchronization, Power Good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Rating Catalog Regulated outputs (#) 1 Control mode Voltage Mode Duty cycle (Max) (%) 100
HTSSOP (PWP) 20 42 mm² 6.5 x 6.4
  • Integrated 7-mΩ high-side and 4.3-mΩ low-side FET switches
  • 300-kHz to 1.5-MHz frequency SYNC pin
  • 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
  • Start-up Into prebiased loads
  • Output voltage tracking capability
  • Wide bandwidth voltage loop error amplifier
  • Adjustable soft-start with external capacitor
  • Precision enable (EN) pin with hysteresis
  • Integrated OVP, OCP, OTP, UVLO and power-good
  • Thermally enhanced HTSSOP-20 exposed pad package
  • Create a custom design using the LM21212-1 with the WEBENCH® Power Designer
  • Integrated 7-mΩ high-side and 4.3-mΩ low-side FET switches
  • 300-kHz to 1.5-MHz frequency SYNC pin
  • 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
  • Start-up Into prebiased loads
  • Output voltage tracking capability
  • Wide bandwidth voltage loop error amplifier
  • Adjustable soft-start with external capacitor
  • Precision enable (EN) pin with hysteresis
  • Integrated OVP, OCP, OTP, UVLO and power-good
  • Thermally enhanced HTSSOP-20 exposed pad package
  • Create a custom design using the LM21212-1 with the WEBENCH® Power Designer

The LM21212-1 is a monolithic synchronous point-of-load 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 suited for a wide variety of low voltage systems. The voltage mode control loop provides high noise immunity, narrow duty-cycle capability and can be compensated to be stable with any type of output capacitance, providing maximum flexibility and ease of use.

The LM21212-1 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 LM21212-1 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 synchronized to the falling edge of a clock between frequencies of 300 kHz to 1.5 MHz.

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.

The LM21212-1 is a monolithic synchronous point-of-load 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 suited for a wide variety of low voltage systems. The voltage mode control loop provides high noise immunity, narrow duty-cycle capability and can be compensated to be stable with any type of output capacitance, providing maximum flexibility and ease of use.

The LM21212-1 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 LM21212-1 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 synchronized to the falling edge of a clock between frequencies of 300 kHz to 1.5 MHz.

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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Technical documentation

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Type Title Date
* Data sheet LM21212-1 2.95-V To 5.5-V, 12-A, Voltage-Mode Synchronous Buck Regulator With Frequency Synchronization datasheet (Rev. F) PDF | HTML 21 May 2019
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Technical article Minimize the impact of the MLCC shortage on your power application 29 Mar 2019
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Technical article How to optimize your DSP power budget 03 Oct 2013
User guide AN-2107 LM21212-1 Evaluation Board (Rev. B) 05 May 2013

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM21212-1EVM — LM21212-1EVM Evaluation Board

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

User guide: PDF
Not available on TI.com
Simulation model

LM21212-1 PSpice Average Model

SNVM395.ZIP (53 KB) - PSpice Model
Simulation model

LM21212-1 PSpice Transient Model

SNVM394.ZIP (192 KB) - PSpice Model
Simulation model

LM21212-1 Unencrypted PSpice Average Model

SNVM802.ZIP (1 KB) - PSpice Model
Simulation model

LM21212-1 Unencrypted PSpice Transient Model

SNVM801.ZIP (2 KB) - PSpice Model
Calculation tool

LM21212-1DESIGN-CALC — LM21212-1 Design Spreadsheet

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 (...)
Reference designs

PMP7804 — Multiple Output Power Solution for Kintex 7 Application

The PMP7804 reference design provides all the power supply rails necessary to power the Xilinx ® Kintex ® 7 series family of FPGAs.  This design utilizes Simple Switcher power modules along with the LM2121x low voltage synchronous buck regulators for "ease of use" and shorter design (...)
Test report: PDF
Schematic: PDF
Package Pins Download
HTSSOP (PWP) 20 View options

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