- 4.5V to 36V input voltage range
- 3A output current, 5.2A peak current
- 130mΩ/110MΩ integrated power MOSFET
- Synchronous rectification with 94% peak efficiency
- 1.5% feedback voltage accuracy
- Current mode control with optional compensation
- Resistor programming capable of oscillating 1MHz
- The adjustable output voltage is as low as 0.8V
- Compatible with prebiased loads
- Programmable soft-start with external capacitors
- Precision enable pin with hysteresis
- OVP, UVLO input and PGOOD output
- Internal protection with peak current limit, thermal shutdown and restart
- Accurate current limiting minimizes inductor size
- Nonlinear current mode ramp compensation
- eTSSOP - 20 bare pad package
illustrate
The LM20343 is a full-featured synchronous buck regulator capable of delivering up to 3A of load current. External current-mode control loop compensation, consisting of only two parts, provides both high performance and ease of use. The device is optimized for operation from a 4.5V to 36V input voltage range, making it suitable for high voltage systems.
The device features internal overvoltage protection (OVP) and overcurrent protection (OCP) circuitry to improve system reliability. A high-precision enable pin and integrated undervoltage lockout allow for tight control and sequencing of the device. Both a fixed internal and externally adjustable soft-start circuit limits the inrush current at startup. Possible with integrated power good (PGOOD) circuit fault detection and power sequencing.
The frequency of the device can be adjusted from 250 kHz to 1.0 MHz by connecting an external resistor to the RT pin to ground.
The LM20343 is designed to work in a multirail power architecture. The output voltage of the device can be configured to track a higher voltage rail, using SS/TRK pins. If the output of the LM20343 is prebiased when it is turned on, it does not sink current and pull the output low until the internal soft-start ramp exceeds the voltage feedback pin.
The LM20343 is a 20-pin eTSSOP package with an exposed pad that can be soldered to a PCB, eliminating the need for a bulky heat sink.
apply
- Simple design, load regulation, high efficiency angle, from a 4.5V to 36V bus
- High performance DSP FPGAs, ASICs and microprocessors
- Communication infrastructure, automobiles
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