FEATURES
• Available in AEC-Q100 Temperature Grade 1
• Input Voltage Range 2.95V to 5.5V
• Accurate Current Limit Minimizes Inductor
Size
• 97% Peak Efficiency
• Adjustable Switching Frequency (250 kHz to
750 kHz)
• 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
• HTSSOP 16-Pin Exposed Pad Package

APPLICATIONS
• Simple to Design, High Efficiency Point of
Load Regulation from a 5V or 3.3V Bus
• High Performance DSPs, FPGAs, ASICs and
Microprocessors
• Broadband, Networking and Optical
Communications Infrastructure

DESCRIPTION
The LM20145 is a full featured adjustable frequency
synchronous buck regulator capable of delivering up
to 5A 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 LM20145 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 LM20145 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 frequency of this device can be adjusted from
250 kHz to 750 kHz by connecting an external
resistor from the RT pin to ground.
The LM20145 is offered in a 16-pin HTSSOP
package with an exposed pad that can be soldered to
the PCB, eliminating the need for bulky heatsinks.