Linear Technology Corporation announces the LTC3204B-3.3/5 charge pump doublers offered in the 2mm x 2mm DFN packages. Featuring low-noise constant-frequency (1.2MHz) operation, the LTC3204B-3.3 generates a regulated boosted output voltage of 3.3V from a minimum input voltage of 1.8V (2 AA cell alkaline or NiMH) at output currents up to 50mA, while the LTC3204B-5 produces a 5V output from a minimum 2.7V (Li-Ion battery) input voltage at currents up to 150mA.
The LTC3204B is ideal for applications sensitive to variable-frequency operation. The device's patented constant-frequency architecture ensures both low input and low output ripple, especially at light loads, to minimize switching noise. Other features include automatic soft start circuitry to prevent excessive inrush current during startup, load disconnect from the input during shutdown, plus current limit and thermal shutdown circuitry.
The LTC3204B's high switching frequency enables the use of tiny external ceramic capacitors, saving size and cost. Low external parts count of one flying capacitor and two bypass capacitors, in addition to the low profile DFN package, make the LTC3204B an extremely compact solution for space-constrained applications.
The LTC3204BEDC-3.3 and LTC3204BEDC-5 are available in the low-profile 6-lead DFN (2mm x 2mm x 0.75mm) package. 1,000-piece pricing starts at $1.50 each.
Summary of Features: LTC3204B
Fixed Outputs:
- 3.3V for LTC3204-3.3
- 5V for LTC3204-5
Output Currents:
- 50mA for LTC3204-3.3
- 150mA for LTC3204-5
Wide VIN Ranges:
- 1.8V to 4.5V for LTC3204-3.3
- 2.7V to 5.5V for LTC3204-5
Low Noise Constant Frequency (1.2MHz) Operation
Low Input & Output Ripple
Automatic Soft-Start Limits Inrush Current
Low Shutdown Current <1uA
Low Profile 6-Pin DFN (2mm x 2mm x 0.75mm) Package