2.95-5.5V, 12A, Voltage Mode Synchronous Point of Load Buck Regulator with Frequency Synchronization - LM21212-1

LM21212-1 (ACTIVE)

2.95-5.5V, 12A, Voltage Mode Synchronous Point of Load Buck Regulator with Frequency Synchronization

 

Description

The LM21212-1 is a monolithic synchronous point of load buck regulator that is capable of delivering up to 12A of continuous output current while producing an output voltage down to 0.6V with outstanding efficiency. The device is optimized to work over an input voltage range of 2.95V to 5.5V, 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 over voltage protection (OVP) and over-current 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. Startup 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 300kHz to 1.5MHz.

If the output is pre-biased at startup, it will not sink current, allowing the output to smoothly rise past the pre-biased 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 heatsinks.

Features

  • Integrated 7.0 mΩ High Side and 4.3 mΩ Low Side FET Switches
  • 300 kHz to 1.5 MHz Frequency SYNC pin
  • Adjustable Output Voltage From 0.6V to VIN (100% duty cycle capable), ±1% Reference
  • Input Voltage Range 2.95V to 5.5V
  • Startup Into Pre-Biased 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 HTSSOP-20 Exposed Pad Package

All trademarks are the property of their respective owners.

View more

Parametrics Compare all products in Buck Converter (Integrated Switch)

 
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)
Special Features
Control Mode
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
Approx. Price (US$)
LM21212-1 LM21212-2 LM21215 LM21215A
2.95     2.95     2.95     2.95    
5.5     5.5     5.5     5.5    
0.6     0.6     0.6     0.6    
5.5     5.5     5.5     5.5    
12     12     15     15    
1     1     1     1    
300     300     500     300    
1500     1500     500     1500    
1.5     1.5     1.5     1.5    
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
Enable
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
Adjustable Current Limit
Enable
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
Voltage Mode     Voltage Mode     Voltage Mode      
100     100     100     100    
-40 to 125     -40 to 125     -40 to 125     -40 to 125    
Catalog     Catalog     Catalog     Catalog    
HTSSOP     HTSSOP     HTSSOP     HTSSOP    
3.30 | 1ku     3.30 | 1ku     3.55 | 1ku     3.55 | 1ku    
New! Interactive Design
Click to instantly view a schematic, charts, Bill of Materials, and Operating Values.

WEBENCH® Designer LM21212-1

  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


Footprint BOM Cost Efficiency


Preview design