LM20124 2.95-5.5V, 4A, Current Mode Synchronous Buck Regulator with Optional Automotive Grade | TI.com

LM20124 (ACTIVE) 2.95-5.5V, 4A, Current Mode Synchronous Buck Regulator with Optional Automotive Grade

 

Description

The LM20124 is a full featured 1 MHz synchronous buck regulator capable of delivering up to 4A of continuous output current. The current mode control loop can be compensated to be stable with virtually any type of output capacitor. For most cases, compensating the device only requires two external components, providing maximum flexibility and ease of use. The device is optimized to work over the input voltage range of 2.95V to 5.5V making it suited for a wide variety of low voltage systems.

The device features internal over voltage protection (OVP) and over current protection (OCP) circuits for increased system reliability. A precision enable pin and integrated UVLO allows the turn-on of the device to be tightly controlled and sequenced. Start-up inrush currents are limited by both an internally fixed and externally adjustable Soft-Start circuit. Fault detection and supply sequencing is possible with the integrated power good circuit.

The LM20124 is designed to work well in multi-rail power supply architectures. The output voltage of the device can be configured to track a higher voltage rail using the SS/TRK pin. If the output of the LM20124 is pre-biased at startup it will not sink current to pull the output low until the internal soft-start ramp exceeds the voltage at the feedback pin.

The LM20124 is offered in a 16-pin TSSOP package with an exposed pad that can be soldered to the PCB, eliminating the need for bulky heatsinks.

Features

  • LM20124-Q1 is AEC-Q100 qualified and manufactured on an Automotive Grade Flow
  • Input voltage range 2.95V to 5.5V
  • Accurate current limit minimizes inductor size
  • 96% efficiency at 1 MHz switching frequency
  • 32 mΩ integrated FET switches
  • Starts up into pre-biased loads
  • Output voltage tracking
  • Peak current mode control
  • Adjustable output voltage down to 0.8V
  • Adjustable Soft-Start with external capacitor
  • Precision enable pin with hysteresis
  • Integrated OVP, UVLO, power good and thermal shutdown
  • TSSOP 16 pin exposed pad package

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WEBENCH® Designer LM20124

  Min   Max Range
Vin  V 2.95 to 5.5V
Vout  V 0.8 to 4V
Iout  A ≤ 4A
Ambient Temp  °C -40 to 125°C

Parametrics

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Part number Order 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)
LM20124 Order now 2.95     5.5     0.8     5     4     1     1000     1000     3.5     Enable
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
Current Mode     85     -40 to 125     Catalog     HTSSOP | 16     Converter     16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)    
LM20123 Samples not available 2.95     5.5     0.8     5     3     1     1500     1500     3.5     Adjustable Current Limit
Enable
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
Current Mode     85     -40 to 125     Catalog     HTSSOP | 16     Converter     16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)    
LM20125 Samples not available 2.95     5.5     0.8     5     5     1     500     500     3.5     Enable
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
Current Mode     85     -40 to 125     Catalog     HTSSOP | 16     Converter     16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)    
LM20133 Order now 2.95     5.5     0.8     5     3     1     460     1500     3.5     Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
Current Mode     85     -40 to 125     Catalog     HTSSOP | 16     Converter     16HTSSOP: 32 mm2: 6.4 x 5 (HTSSOP | 16)    
LM20134 Order now 2.95     5.5     0.8     5     4     1     460     1500     3.5     Enable
Frequency Synchronization
Power Good
Pre-Bias Start-Up