2.95-5.5V, 15A,  Voltage Mode Synchronous Buck Regulator - LM21215

LM21215 (ACTIVE)

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

Description

The LM21215 is a monolithic synchronous point of load buck regulator that is capable of delivering up to 15A 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 LM21215 features internal over voltage protection (OVP) and resistor-programmable 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 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 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
  • Adjustable Current Limit
  • Adjustable Output Voltage From 0.6V to VIN (100% Duty Cycle Capable), ±1% Reference
  • Input Voltage Range 2.95V to 5.5V
  • 500 kHz Fixed Switching Frequency
  • 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, OTP, UVLO and Power-Good
  • Thermally Enhanced HTSSOP-20 Exposed Pad Package

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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) 15
Iout2 (Max) (A) -
Vout2 (Min) (V) -
Vout2 (Max) (V) -
Topology Buck
  • Boost
  • Buck
  • Buck-Boost
  • Inverting Buck-Boost
Switching Frequency (Max) (kHz) 500
Switch Current Limit (Typ) (A) 20
Iq (Typ) (mA) 1.5
Duty Cycle (Max) (%) 100
Soft Start Adjustable
  • Adjustable
  • Fixed
  • None
Compensation External
  • External
  • Internal
  • Not Needed
Special Features Adjustable Current Limit
Enable
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking
  • 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$) 3.55 | 1ku
Package Group HTSSOP
  • CFP
  • DDPAK/TO-263
  • DSBGA
  • DSLGA
  • HTSSOP
  • LQFN-CLIP
  • LSON-CLIP
  • MSOP-PowerPAD
  • PDIP
  • QFN
  • SO PowerPAD
  • SOIC
  • SON
  • SOT
  • SOT-23
  • TO-220
  • TO-263
  • TSSOP
  • USON
  • VQFN
  • VQFN-CLIP
  • VSON
  • VSSOP
  • WQFN
  • WSON
  • XCEPT
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Featured tools and software

WEBENCH® LM21215
    Min   Max   Range  
  Vin V    2.95 – 5.50V  
  Vout V    0.60 – 5.40V  
  Iout A    ≤ 15A  
  Ambient Temp °C    -40 – 125°C  
Footprint BOM Cost Efficiency
 
   
 
 
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Companion parts

Part # Name Product Family Comments
LM21212-1   2.95-5.5V, 12A, Voltage Mode Synchronous Point of Load Buck Regulator with Frequency Synchronization   CONVERTER (INTEGRATED SWITCH) - STEP-DOWN (BUCK) CONVERTER    
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    
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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