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Designed specifically to meet the requirement for extended opera-tion of battery-powered equipment such as cordless and cellular tele-phones, the A8220SLH thru A8233SLH voltage regulators offer the reduced dropout voltage and quiescent current essential for maximum battery life. Applicable also to palmtop computers and personal data assistants, these devices deliver a regulated output at up to 100 mA(transient), which is limited only by package power dissipation. Regu-lated output voltages of 2.6, 2.7, 2.8, 2.9, 3.0 and 3.3 are currently provided. Other voltages, down to 2.0 volts, are available on special order.
A PMOS pass element provides a typical dropout voltage of only 125 mV at 50 mA of load current. The low dropout voltage permits deeper battery discharge before output regulation is lost. Quiescent current does not increase significantly as the dropout voltage is approached, an ideal feature in standby/resume power systems where data integrity is crucial. Regulator accuracy and excellent temperature characteristics are provided by a bandgap reference. The A8220SLH thru A8233SLH include ENABLE inputs to give the designer complete control over power up, standby, or power down.
These devices are supplied in a thermally enhanced 5-lead small-outline plastic package similar to the SOT-23, and fitting the SC-74A footprint. All devices are rated for operation over a temperature range of -20to +85
* Output current rating is limited by inputDISCONT voltage, duty cycle, and ambient tempera-ture. Under any set of conditions, do not exceed a junction temperature of +150°C
8221 Features
High Efficiency Provides Extended Battery Life 125 mV Typical Dropout Voltage at IO = 50 mA 32 A Typical Quiescent Current Less Than 1 A "Sleep" Current Low Output Noise 100 mA Peak Output Current mproved PSRR and Transient Performance
8221 Typical Application
Cordless and Cellular Telephones FERENCE Personal Data Assistants Personal Communicators Palmtop Computers
