The MAX1730EUB+ is a 50mA regulated step-down charge pump for 1.8V or 1.9V logic in 10 pin μMAX package. This charge pump generates up to 50mA at fixed output voltages of 1.8V or 1.9V. It is specifically designed to provide high efficiency logic supplies in applications that demand a compact design, it employs fractional conversion techniques to provide efficiency exceeding that of a linear regulator. It operates at up to 2MHz, permitting use of small 0.22μF flying capacitors while maintaining low 75μA quiescent supply current. Proprietary soft-start circuitry prevents excessive current from being drawn from the supply during startup, making IC compatible with higher impedance sources such as alkaline and lithium-ion cells. It is used in low-voltage logic supplies, wireless handsets, PDAs and PC cards.
- Supply voltage range is 2.7V to 5.5V
- Operating temperature range from -40°C to 85°C
- Peak efficiency is > 85%
- Dual mode 1.8V or 1.9V output
- ±3% output voltage accuracy
- Up to 2MHz operating frequency
- Small 0.22μF capacitors, no inductor required
- Output disconnects from input in shutdown mode
- Start up time is 4.1ms (typ)
- Thermal shutdown threshold is 150°C
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