LM20242 4.5-36V, 2A Current Mode Synchronous Buck Regulator with Adjustable Frequency | TI.com

LM20242 (ACTIVE) 4.5-36V, 2A Current Mode Synchronous Buck Regulator with Adjustable Frequency

 

Description

The LM20242 is a full featured 1MHz capable synchronous buck regulator capable of delivering up to 2A of load current. The current mode control loop is externally compensated with only two external components, offering both high performance and ease of use. The device is optimized to work over the input voltage range of 4.5V to 36V making it well suited for high 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. 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 PGOOD circuit.

The LM20242 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 LM20242 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 LM20242 is offered in an exposed pad 20 pin HTSSOP package that can be soldered to the PCB, eliminating the need for bulky heatsinks.

Features

  • 2A Output Current, 3.7A Peak Current
  • 130 mΩ/110 mΩ Integrated Power MOSFETs
  • 1.5% Output Voltage Accuracy
  • Current Mode Control, Selectable Compensation
  • Resistor Programmed, 1MHz Capable Oscillator
  • Synchronous Rectifier with Diode Emulation
  • Adjustable Output Voltage Down to 0.8V
  • Compatible with Pre-Biased Loads
  • Programmable Soft-Start With External Capacitor
  • Precision Enable Pin with Hysteresis
  • OVP, UVLO Inputs and PGOOD Output
  • Internally Protected with Peak Current Limit, Thermal Shutdown and Restart
  • Accurate Current Limit with Frequency Foldback
  • Non-Linear Current Mode Slope Compensation
  • HTSSOP Exposed Pad Package

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WEBENCH® Designer LM20242

  Min   Max Range
Vin  V 4.5 to 36.0V
Vout  V 0.8 to 33V
Iout  A ≤ 2A
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)
LM20242 Order now 4.5     36     0.8     32     2     1     100     1000     2     Enable
Over Current Protection
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking    
Current Mode     90     -40 to 125     Catalog     HTSSOP | 20     Converter     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)