The LTC1522CMS8 is a micropower charge pump DC/DC converter that produces a regulated 5V output from a 2.7V to 5V input supply. Extremely low supply current (6µA typical with no load, <1µA in shutdown) and low external parts count (one 0.22µF flying capacitor and two 10µF capacitors at VIN and VOUT) make the LTC1522CMS8 ideally suited for small, light load battery-powered applications. Typical efficiency (VIN = 3V) exceeds 75% with load currents between 50µA and 20mA. Modulating the SHDN pin keeps the typical efficiency above 75% with load currents all the way down to 10µA.
The LTC1522CMS8 has thermal shutdown and can survive a continuous short from VOUT to GND. In shutdown the load is disconnected from VIN. The part is available in 8-pin MSOP and SO packages. The LTC1522CMS8 is pin compatible with the LTC1516 in applications where VIN ≥ 2.7V and IOUT ≤ 20mA.
Feature
- Ultralow Power: Typical Operating ICC = 6µA
- Short-Circuit/Thermal Protected
- Regulated 5V ±4% Output Voltage
- 2.7V to 5V Input Range
- No Inductors
- Very Low ICC in Shutdown: <1µA
- Output Current:
- 10mA (VIN ≥ 2.7V)
- 20mA (VIN ≥ 3V)
- Shutdown Disconnects Load from VIN
- Internal Oscillator: 700kHz
- Compact Application Circuit (<0.1 in2)
- 8-Pin MSOP and SO Packages
Applications
- SIM Interface Supplies for GSM Cellular Telephones
- Li-Ion Battery Backup Supplies
- Local 3V to 5V Conversion
- Smart Card Readers
- PCMCIA Local 5V Supplies
