Features
| • | 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 |
| • | eTSSOP-16 exposed pad package |
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.
The LM20134 is offered in a 16-pin eTSSOP package with an exposed pad that can be soldered to the PCB, eliminating the need
for bulky heatsinks.
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 |
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Also Recommended
| LM20123▲ | 3A, 1.5 MHz Switching Frequency |
| LM20124▲ | 4A, 1 MHz Switching Frequency |
| LM20125▲ | 5A, 500 KHz Switching Frequency |
| LM20133▲ | 3A, Input Synchronization (500 KHz - 1.5 MHz) |
| LM20143▲ | 3A, Adjustable Frequency (500 KHz - 1.5 MHz) |
| LM20144▲ | 4A, Adjustable Frequency (500 KHz - 1.5 MHz) |
| LM20145▲ | 5A, Adjustable Frequency (250 KHz - 750 KHz) |
| LM20154▲ | 4A, SYNCOUT |
| LM20242▲ | 36V, 2A Adjustable Frequency (250 KHz - 750 KHz) |
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LM20134
LM20123
