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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 A8405SLH voltage regulators offer the reduced dropout voltage and quiescent current essential for ruaximum battery life. Applicable also to palmtop computers and personal data assistants, these devices deliver a regulated output at up t0 200 mA (transient), which is internally limited, providing short-circuit protection. Regu- lated output voltages of 2.7, 2.8, 3.0, 3.2, 3.3, 3.6, 3.8, 4.0, and 5.0 V are currently provided. Other voltages, down t0 2.0 volts, are available on special order. A PMOS pass element provides a typical dropout voltage of only 100 mV at 100 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 ap- proached, 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 A8405SLH includes an ENABLE input 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 -200C to +85aC.
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