Charge pump optimised for handheld and battery-powered applications

AME has introduced the AME7739 charge-pump voltage converter, which requires only two low-value ceramic capacitors and a pump capacitor to produce a regulated output delivering up to 60mA. No external inductors are required.

These savings combine with the small dimensions of the converter’s SOT-26 package to reduce PCB footprint in space-restricted designs. A number of versions are available, offering fixed output voltages of 3.3V, 3.0V, 2.7V or 2.5V from an input voltage in the range 1.8V to 5.5V. Two other fixed-output versions are available, producing 5.0V from an input between 2.7V and 5.5V, or 5.5V from a 3.3V-5.5V input.

The AME7739 is optimised for batterypowered applications, with low output ripple and high efficiency over a large portion of its load range, as well as an energy-saving shutdown mode initiated via an external pin.

This mode disconnects the output and reduces input quiescent current to below 1µA. The device also implements on-chip short-circuit protection and over-temperature protection.

 

FEATURES Step-up or step-down operation ±5% output accuracy 400mW power dissipation 1MHz switching frequency Operating temperature range: -40°C to 85°C

APPLICATIONS LED backlight drivers LCD displays Smart-card readers SIM card power supplies PCMICA cards

 

 

 

• Cooper Bussmann’s PowerStor® KR series, page 070917
• Varta Microbattery’s PoLiFlex® range, page 070922
• austriamicrosystems’ AS1360 LDO voltage regulators, page 070923
• ON Semiconductor’s NCV2001SN2T1G operational amp, page 070928

 

www.ame.com.tw/English/Pr/ePr_CP_01.asp?PF=5