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.