LTC3204-3.3/LTC3204-5/LTC3204B-3.3/LTC3204B-5 are low noise, constant frequency (1.2MHz) switched capacitor voltage doublers. The LTC3204-3.3/LTC3204B-3.3 can produce a regulated output voltage of 3.3V from a minimum input voltage of 1.8V (2 alkaline cells) whereas the LTC3204-5/LTC3204B-5 can produce 5V from a minimum of 2.7V (Li-Ion battery) input. LTC3204-3.3/LTC3204-5 feature automatic Burst Mode® operation at light loads to maintain low supply current whereas LTC3204B-3.3/LTC3204B-5 feature constant frequency operation at any load. Built-in soft-start circuitry prevents excessive inrush current during start-up. Thermal shutdown and current-limit circuitry allow the parts to survive a continuous short-circuit from VOUT to GND. High switching frequency minimizes overall solution footprint by allowing the use of tiny ceramic capacitors. In shutdown, the load is disconnected from the input and the quiescent current is reduced to <1µA. The LTC3204-3.3/LTC3204-5/LTC3204B-3.3/LTC3204B-5 are available in a low profile (0.75mm) 6-lead 2mm × 2mm DFN package.
The LTC3204 family provides low‑noise, constant‑frequency (1.2 MHz) switched‑capacitor charge‑pump regulators in a 6‑lead 2 mm × 2 mm DFN package. Two versions are offered: a 3.3 V output version (Vin 1.8 V‑4.5 V, up to 50 mA) and a 5 V output version (Vin 2.7 V‑5.5 V, up to 150 mA). Features include automatic burst‑mode operation, built‑in soft‑start, shutdown disconnect, and short‑circuit/thermal protection.
Typical applications cover battery‑powered devices such as AA‑cell to 3.3 V conversion, Li‑ion to 5 V conversion, USB On‑The‑Go power, white‑LED drivers, and handheld electronics. The datasheet also provides pin definitions, electrical characteristics, and layout recommendations for optimal performance.
| Output Voltage | 3.3 V or 5 V |
|---|---|
| Input Voltage Range (3.3 V version) | 1.8 V to 4.5 V |
| Maximum Output Current (5 V version) | 150 mA |
| Shutdown Current | <1 pA |
| Switching Frequency | 1.2 MHz |
| Package | 6‑lead 2 mm × 2 mm DFN |
The shutdown current is less than 1 pA.
The 3.3 V version accepts an input voltage from 1.8 V to 4.5 V.
The 5 V version can deliver up to 150 mA of output current.