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

All trademarks are the property of their respective owners.

View more

Parametrics Compare all products in Step-Down (Buck) Converter

 
Regulated Outputs (#)
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Topology
Switching Frequency (Max) (kHz)
Switch Current Limit (Typ) (A)
Iq (Typ) (mA)
Duty Cycle (Max) (%)
Soft Start
Compensation
Special Features
Brand
Control Mode
Vref Accuracy (Typ) (%)
Rating
Operating Temperature Range (C)
Pin/Package
Approx. Price (US$)
LM21215 TPS53353 TPS53355 LM21215A TPS56121 TPS56221 LM21212-1 TPS53316 TPS53319 TPS53318 TPS62240 TPS62290 TPS62260
1     1     1     1     1     1     1     1     1     1     1     1     1    
2.95     1.5     1.5     2.95     4.5     4.5     2.95     2.9     1.5     1.5     2     2.3     2    
5.5     15     15     5.5     14     14     5.5     6     22     22     6     6     6    
0.6     0.6     0.6     0.6     0.6     0.6     0.6     0.6     0.6     0.6     0.6     0.6     0.6    
5.5     5.5     5.5     5.5     12     12     5.5     5.5     5.5     5.5     6     6     6    
15     20     30     15     15     25     12     5     14     8     0.3     1     0.6    
Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck     Buck    
500     1000     1000     1500     1000     1000     1500     2000     1000     1000     2500     2500     2500    
20     28     40     20     21     35     17     9     22     8     0.7     1.4     1    
1.5     0.32     0.32     1.5     2.5     2.5     1.5     0.32     0.32     0.32     0.015     0.015     0.015    
100     90     90     100     93     93     100     99     90     90     100     100     100    
Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Adjustable     Fixed     Adjustable     Fixed     Fixed     Fixed    
External     Not Needed     Not Needed     External     External     External     External     External     Not Needed     Not Needed     Internal     Internal     Internal    
Adjustable Current Limit
Enable
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
Adjustable Current Limit
Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
Adjustable Current Limit
Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
Enable
Power Good
Adjustable Current Limit
Synchronous Rectification    
Enable
Light Load Efficiency
Synchronous Rectification    
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
Enable
Light Load Efficiency
Output Discharge
Power Good
Synchronous Rectification    
Adjustable Current Limit
Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
Adjustable Current Limit
Enable
Light Load Efficiency
Power Good
Synchronous Rectification    
Enable
Light Load Efficiency
Synchronous Rectification    
Enable
Light Load Efficiency
Synchronous Rectification    
Enable
Light Load Efficiency
Synchronous Rectification    
  SWIFT     SWIFT       SWIFT     SWIFT         SWIFT     SWIFT          
Voltage Mode     D-CAP     D-CAP     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     Voltage Mode     D-CAP     D-CAP     Voltage Mode     Voltage Mode     Voltage Mode    
1     1     1     1     1     1     1     1     1     1     1.5     1.5     1.5    
Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog     Catalog    
-40 to 125     -40 to 85     -40 to 85     -40 to 125     -40 to 125     -40 to 125     -40 to 125     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85     -40 to 85    
20HTSSOP     22LSON-CLIP     22LSON-CLIP     20HTSSOP     22LSON-CLIP     22LSON-CLIP     20HTSSOP     16QFN     22LSON-CLIP     22LSON-CLIP     5SOT
6SON    
6SON     5SOT
6SON    
3.55 | 1ku     3.50 | 1ku     3.75 | 1ku     3.55 | 1ku     3.50 | 1ku     3.75 | 1ku     3.30 | 1ku     1.99 | 1ku     3.35 | 1ku     3.05 | 1ku     0.50 | 1ku     0.80 | 1ku     0.65 | 1ku    

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
 
   
 
 
'U1 Css Rpgood Rf Cf L1 Rilim Rfb1 Rfb2 Cout Rc1 Rc2 Cc1 Cc2 Cc3 Cin '
 
What are WEBENCH® tools?

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    
Click Here