The LTC3568 is a constant frequency, synchronous step-down DC/DC converter. It is intended for medium power applications, operating from a 2.5V to 5.5V input voltage range. The device has a user-configurable operating frequency up to 4MHz, allowing the use of tiny, low cost capacitors and inductors 2mm or less in height. The output voltage is adjustable from 0.8V to 5V. Internal sychronous 0.11Ω power switches with 2.4A peak current ratings provide high effi ciency. The LTC3568’s current mode architecture and external compensation allow the transient response to be optimized over a wide range of loads and output capacitors. The LTC3568 can be confi gured for automatic power sav- ing Burst Mode operation to reduce gate charge losses when the load current drops below the level required for continuous operation. For reduced noise and RF interfer- ence, the SYNC/MODE pin can be confi gured to skip pulses or provide forced continuous operation. To further maximize battery life, the P-channel MOSFET is turned on continuously in dropout (100% duty cycle) with a low quiescent current of 60μA. In shutdown, the device draws <1μA.
The LTC3568 is a constant‑frequency, synchronous step‑down regulator intended for medium‑power applications. It operates from a 2.5 V to 5.5 V input range, provides an adjustable 0.8 V‑5 V output, and can run at frequencies up to 4 MHz, enabling the use of tiny, low‑cost capacitors and inductors. Internal 0.11 Ω switches handle up to 2.4 A peak current, delivering efficiencies up to 96 % while maintaining a quiescent current of only 60 µA and a shutdown current below 1 µA.
Typical applications include notebook computers, digital cameras, cellular phones, handheld instruments and board‑mounted power supplies. The device is offered in a 3 mm × 3 mm, 10‑lead DFN package and is qualified for operation from –40 °C to 85 °C ambient temperature.
| Input voltage range | 2.5 V – 5.5 V |
|---|---|
| Output voltage range | 0.8 V – 5 V |
| Peak switch current | 2.4 A |
| Switch on‑resistance (RDS(on)) | 0.11 Ω |
| Quiescent current (active mode) | 60 µA |
| Shutdown current | <1 µA |
| Package | 3 mm × 3 mm 10‑lead DFN |
In shutdown the LTC3568 draws less than 1 µA.