The LTC3542 is a 500mA, 2.25MHz synchronous step-down DC/DC converter using a constant frequency, current mode architecture for single Li-Ion battery-powered applications.
The LTC3542 is a monolithic synchronous buck converter that operates at a constant 2.25 MHz frequency. It delivers up to 96% efficiency, supports a 2.5 V to 5.5 V input range, and features a 100% duty‑cycle for low‑dropout operation. Quiescent current is only 500 pA in active mode and drops below 1 pA in shutdown.
Typical applications include cellular phones, wireless modems, digital cameras, MP3 players and other handheld devices. The device can be synchronized to an external 1‑3 MHz clock and offers burst‑mode and pulse‑skip operation for ultra‑low‑power use.
| Active‑Mode Supply Current | 500 pA |
|---|---|
| Shutdown Supply Current | <1 pA |
| Switching Frequency | 2.25 MHz (constant) |
| Efficiency | Up to 96 % |
| Output Ripple | <20 mV p‑p (typical) |
The active‑mode supply current is 500 pA.
Pull the RUN pin below 0.3 V; the device then draws less than 1 pA.
The converter runs at a constant 2.25 MHz and can be synchronized to an external 1‑3 MHz clock.