1FEATURES

2• LM20134Q 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

• 97% Peak Efficiency

• Frequency Synchronization Pin

• 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 LM20134 is a full featured 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 switching frequency of the LM20134 can be

synchronized to an external clock by use of the

SYNC pin. The SYNC pin is capable of synchronizing

to input signals ranging from 500 kHz to 1.5 MHz

The LM20134 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 LM20134 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.