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.