1FEATURES

23• 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

APPLICATIONS

• Simple to Design, High Efficiency Point of

Load Regulation from a 4.5V to 36V Bus

• High Performance DSPs, FPGAs, ASICs and

Microprocessors

• Communications Infrastructure, Automotive

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.