LM21215A 2.95-5.5V, 15A, Voltage Mode Synchronous Buck Regulator with Frequency Synchronization | TI.com

LM21215A (ACTIVE)

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

 

Description

The LM21215A is a synchronous buck DC-DC converter that delivers up to 15 A of output current at output voltages as low as 0.6 V. Operating over an input voltage range of 2.95 V to 5.5 V with ultra-high efficiency, the LM21215A suits a wide variety of low voltage systems. The voltage-mode control loop with high gain-bandwidth error amplifier provides high noise immunity, narrow duty cycle capability and is easily compensated for stable operation with any type of output capacitor, providing maximum flexibility and ease of use.

The LM21215A features internal overvoltage protection (OVP) and cycle-by-cycle overcurrent 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 an internally-fixed or externally-adjustable soft-start circuit. An integrated open-drain PGOOD indicator provides fault reporting and supply sequencing.

Other features include auxiliary voltage rail tracking, monotonic startup into pre-biased loads, and switching frequency synchronization to an external clock signal between 300 kHz and 1.5 MHz for beat-frequency sensitive and multi-regulator applications. The LM21215A is offered in a thermally-enhanced 20-pin HTSSOP package with an exposed pad that is soldered to the PCB to achieve a very low junction-to-board thermal impedance.

Features

  • High-Efficiency Synchronous DC-DC Converter
    • Input Voltage Range of 2.95 V to 5.5 V
    • Adjustable Output Voltage From 0.6 V to VIN
    • Output Current as High as 15 A
  • Frequency Synchronization 300 kHz to 1.5 MHz
  • Integrated 7-mΩ PMOS Buck Switch Supports
    100% Duty Cycle for Low Dropout Voltage
  • Integrated 4.3-mΩ NMOS Synchronous Rectifier
    Eliminates Schottky Diode
  • Accurate ±1% Internal Voltage Reference
  • Automatic Diode Emulation Mode for Improved
    Efficiency at Light Loads
  • Monotonic Pre-Biased Startup
  • Internal 0.5-ms or Externally Adjustable Soft-Start
  • Output Voltage Tracking Capability
  • Ultra-Fast Line and Load Transient Response
    • Voltage-Mode PWM Control
    • Wide-Bandwidth Voltage Loop Error Amplifier
  • Precision Enable with Hysteresis
  • Integrated OVP, UVP, OCP and UVLO
  • Open-Drain Power Good Indicator
  • Thermal Shutdown Protection With Hysteresis
  • Thermally-Enhanced HTSSOP-20 Package

View more

Parametrics Compare all products in Buck converters (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)
Features
Control mode
Duty cycle (Max) (%)
Operating temperature range (C)
Rating
Package Group
Type
Package size: mm2:W x L (PKG)
LM21215A LM21212-1 LM21212-2 LM21215
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    
15     12     12     15    
1     1     1     1    
300     300     300     500    
1500     1500     1500     500    
1.5     1.5     1.5     1.5    
Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
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    
Voltage Mode     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 | 20     HTSSOP | 20     HTSSOP | 20     HTSSOP | 20    
Converter     Converter     Converter     Converter    
20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)    

Design tool

New!
WEBENCH® Power Designer is now even easier to use. Try it now.

WEBENCH® Designer LM21215A

  Min   Max Range
Vin  V 2.95 to 5.5V
Vout  V 0.6 to 5.4V
Iout  A ≤ 15A
Ambient Temp  °C -40 to 125°C