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LM21215

ACTIVE

2.95-5.5V, 15A, Voltage Mode Synchronous Buck Regulator with Adjustable Frequency

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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) 15 Iq (typ) (mA) 1.5 Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 500 Features Adjustable current limit, Enable, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode Voltage mode Duty cycle (max) (%) 100 Type Converter
Vin (min) (V) 2.95 Vin (max) (V) 5.5 Vout (min) (V) 0.6 Vout (max) (V) 5.5 Iout (max) (A) 15 Iq (typ) (mA) 1.5 Switching frequency (min) (kHz) 500 Switching frequency (max) (kHz) 500 Features Adjustable current limit, Enable, Power good, Pre-Bias Start-Up, Synchronous Rectification, Tracking Operating temperature range (°C) -40 to 125 Rating Catalog Regulated outputs (#) 1 Control mode Voltage mode Duty cycle (max) (%) 100 Type Converter
HTSSOP (PWP) 20 41.6 mm² 6.5 x 6.4
  • Integrated 7-mΩ high-side and 4.3-mΩ low-side FET switches
  • Adjustable current limit
  • Adjustable output voltage from 0.6 V to VIN (100% duty cycle capable), ±1% reference
  • 2.95-V to 5.5-V input voltage range
  • 500-kHz fixed switching frequency
  • Start-up 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, OTP, UVLO, and power good
  • Thermally enhanced 20-pin HTSSOP exposed pad package
  • Create a custom design using the LM21215 with the WEBENCH Power Designer
  • Integrated 7-mΩ high-side and 4.3-mΩ low-side FET switches
  • Adjustable current limit
  • Adjustable output voltage from 0.6 V to VIN (100% duty cycle capable), ±1% reference
  • 2.95-V to 5.5-V input voltage range
  • 500-kHz fixed switching frequency
  • Start-up 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, OTP, UVLO, and power good
  • Thermally enhanced 20-pin HTSSOP exposed pad package
  • Create a custom design using the LM21215 with the WEBENCH Power Designer

The LM21215 is a monolithic synchronous point-of-load buck regulator that is capable of delivering up to 15 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, 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 LM21215 features internal overvoltage protection (OVP) and resistor-programmable overcurrent protection (OCP) for increased system reliability. A precision enable pin and integrated UVLO allow turn-on 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 LM21215 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. If the output is prebiased at start-up, it will 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 LM21215 is a monolithic synchronous point-of-load buck regulator that is capable of delivering up to 15 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, 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 LM21215 features internal overvoltage protection (OVP) and resistor-programmable overcurrent protection (OCP) for increased system reliability. A precision enable pin and integrated UVLO allow turn-on 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 LM21215 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. If the output is prebiased at start-up, it will 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 LM21215 2.95-V to 5.5-V, 12-A, Voltage-Mode Synchronous Buck Regulator datasheet (Rev. G) PDF | HTML 30 Mar 2022
Selection guide Buck Converter Quick Reference Guide (Rev. B) 08 Apr 2021
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
User guide AN-2130 LM21215 Evaluation Board (Rev. A) 05 May 2013

Design & development

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

Evaluation board

LM21215EVM — Evaluation Board for the LM21215

This evaluation board provides a solution to examine the high efficiency LM21215 buck switching regulator. The LM21215 is capable of driving up to 15A of continuous load current with excellent output voltage accuracy due to its ±1% internal reference. The LM21215 is capable of down converting from (...)

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

LM21215 PSpice Average Model

SNVM399.ZIP (52 KB) - PSpice Model
Simulation model

LM21215 PSpice Transient Model

SNVM398.ZIP (206 KB) - PSpice Model
Simulation model

LM21215 Unencrypted PSpice Average Model

SNVM806.ZIP (1 KB) - PSpice Model
Simulation model

LM21215 Unencrypted PSpice Transient Model

SNVM805.ZIP (2 KB) - PSpice Model
Calculation tool

LM21215DESIGN-CALC — LM21215 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 (...)
Package Pins Download
HTSSOP (PWP) 20 View options

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