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


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.


  • 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

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  LM21212-1 Compare
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Regulated Outputs (#) 1
Vin (Min) (V) 2.95
Vin (Max) (V) 5.5
Vout (Min) (V) 0.6
Vout (Max) (V) 5.5
Iout (Max) (A) 12
Iout2 (Max) (A) -
Vout2 (Min) (V) -
Vout2 (Max) (V) -
Topology Buck
  • Boost
  • Buck
  • Buck-Boost
  • Inverting Buck-Boost
Switching Frequency (Max) (kHz) 1500
Switch Current Limit (Typ) (A) 17
Iq (Typ) (mA) 1.5
Duty Cycle (Max) (%) 100
Soft Start Adjustable
  • Adjustable
  • Fixed
  • None
Compensation External
  • External
  • Internal
  • Not Needed
Special Features Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
  • Adjustable Current Limit
  • Adjustable UVLO
  • Dynamic Voltage Scaling
  • Enable
  • Frequency Synchronization
  • Light Load Efficiency
  • Phase Interleaving
  • Power Good
  • Synchronous Rectification
  • Tracking
Control Mode Voltage Mode
  • COT with emulated ripple
  • Constant on-time (COT)
  • Current Mode
  • D-CAP
  • D-CAP+
  • D-CAP2
  • D-CAP3
  • Voltage Mode
Preset Vout (V) -
Vref Accuracy (Typ) (%) 1
Rating Catalog
  • Automotive
  • Catalog
  • HiRel Enhanced Product
  • High Temp
  • Military
  • Space
Operating Temperature Range (C) -40 to 125 °C to °C
Approx. Price (US$) 3.30 | 1ku
Package Group HTSSOP
  • CFP
  • DDPAK/TO-263
  • MSOP-PowerPAD
  • PDIP
  • QFN
  • SO PowerPAD
  • SOIC
  • SON
  • SOT
  • SOT-23
  • TO-220
  • TO-263
  • USON
  • VQFN
  • VSON
  • WQFN
  • WSON
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Featured tools and software

WEBENCH® LM21212-1
    Min   Max   Range  
  Vin V    2.95 – 5.50V  
  Vout V    0.60 – 5.40V  
  Iout A    ≤ 12A  
  Ambient Temp °C    -40 – 125°C  
Footprint BOM Cost Efficiency
'U1 Css Rpgood Rf Cf L1 Rfb1 Rfb2 Cout Rc1 Rc2 Cc1 Cc2 Cc3 Cin '
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Companion parts

Part # Name Product Family Comments
LM21212-2   2.95-5.5V, 12A, Voltage Mode Synchronous Point of Load Buck Regulator with Adjustable Frequency   CONVERTER (INTEGRATED SWITCH) - STEP-DOWN (BUCK) CONVERTER    
LM21215   2.95-5.5V, 15A, Voltage Mode Synchronous Buck Regulator   CONVERTER (INTEGRATED SWITCH) - STEP-DOWN (BUCK) CONVERTER    
LM21215A   2.95-5.5V, 15A, Voltage Mode Synchronous Buck Regulator with Frequency Synchronization   CONVERTER (INTEGRATED SWITCH) - STEP-DOWN (BUCK) CONVERTER    
LM10011   1% Accuracy 4/6-Bit VID Voltage Programmer for Point of Load Regulator w/ Adj Start-Up Current   POWER SUPPLY SUPPORT - FEEDBACK SIGNAL GENERATOR    
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