- 4.5V to 36V input voltage range
- 3A output current, peak current gender age and sex
- 130mΩ/110mΩ integrated power MOSFETs
- Synchronous rectification with 94% peak efficiency
- 1.5% feedback voltage accuracy
- Current mode control with optional compensation
- Resistor programming, 1MHz capable oscillator
- The adjustable output voltage is as low as 0.8V
- Suitable for prebiased loads
- Programmable soft-start with external capacitors
- The hysteresis needle is precisely activated
- Overvoltage protection, undervoltage lockout output inputs and PGOOD
- Internally protected peak current limit, thermal shutdown and restart
- Accurate current limit minimum inductor size
- Nonlinear ramp compensated current mode
- eTSSOP - 20 bare pads
illustrate
The LM20343 is a full-featured synchronous buck regulator that provides up to 3A of current load capability. Current-mode control loop compensation with only two external components provides both high performance and ease of use. The device is optimized for operation over an input voltage range of 4.5V to 36V, making it ideal for use in high voltage systems.
The device has internal overvoltage protection (OVP) and overcurrent protection (OCP) as circuitry to improve system reliability. Precise enable pins and integrated undervoltage lockout allow steering of tightly controlled and sequencing devices. The start-up inrush current limit is both internally fixed and externally adjustable soft-start circuitry. Fault detection and power sequencing are possible with integrated power-good (PGOOD) circuitry.
The device can adjust the frequency from 250 kHz to 1.0 MHz by connecting an external resistor from the RT pin to ground.
The LM20343 is designed to work well in multi-rail power structures. The output voltage of the device can be set to a higher voltage rail tracking using the stainless steel/tilk pin. If the output of the LM20343 is prebiased at startup, it will not sink current until the internal soft-start ramp output low exceeds the voltage at the feedback pin.
The LM20343 is supplied in a 20-pin eTSSOP package with an exposed pad that can be soldered to a printed circuit board, eliminating the need for bulky heat sinks.
apply
- Simple design regulates high efficiency from a 4.5V to 36V bus load
- High-performance DSPs, FPGAs, ASICs and microprocessors
- Communication infrastructure, automotive
|