LM21212-2 2.95-5.5V, 12A, Voltage Mode Synchronous Buck Regulator with Adjustable Frequency | TI.com

LM21212-2 (ACTIVE) 2.95-5.5V, 12A, Voltage Mode Synchronous Buck Regulator with Adjustable Frequency

 

Recommended alternative parts

  • LM21212-1  -  5.5V, 12A Converter with Frequency Synchronization

Description

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.

Features

  • 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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WEBENCH® Designer LM21212-2

  Min   Max Range
Vin  V 2.95 to 5.5V
Vout  V 0.6 to 5.4V
Iout  A ≤ 12A
Ambient Temp  °C -40 to 125°C

Parametrics

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Part number Order Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Iout (Max) (A) Regulated outputs (#) Switching frequency (Min) (kHz) Switching frequency (Max) (kHz) Iq (Typ) (mA) Features Control mode Duty cycle (Max) (%) Operating temperature range (C) Rating Package Group Type Package size: mm2:W x L (PKG)
LM21212-2 Order now 2.95     5.5     0.6     5.5     12     1     300     1500     1.5     Enable
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
Voltage Mode     100     -40 to 125     Catalog     HTSSOP | 20     Converter     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)    
LM21212-1 Order now 2.95     5.5     0.6     5.5     12     1     300     1500     1.5     Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
Voltage Mode     100     -40 to 125     Catalog     HTSSOP | 20     Converter     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)    
LM21215 Order now 2.95     5.5     0.6     5.5     15     1     500     500     1.5     Adjustable Current Limit
Enable
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
Voltage Mode     100     -40 to 125     Catalog     HTSSOP | 20     Converter     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)    
LM21215A Order now 2.95     5.5     0.6     5.5     15     1     300     1500     1.5     Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
Voltage Mode     100     -40 to 125     Catalog     HTSSOP | 20     Converter     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)