2.5 V Power management for DSP systems

Industry's first 2.5 V supply voltage supervisor operates on 16 µA

Product Features

Fixed 2.5 V output at 0 to 500 mA
V_DO = 95 mV max at 100 mA
I_Q = 292 µA
Shutdown mode: 0.5 µA max
± 2% output tolerance
Characterized for operation from 0°C to 125°C

The TPS71025 offers designers an order of magnitude reduction in dropout voltage and quiescent current over conventional bipolar Low Dropout (LDO) Voltage Regulators. The latest member of the family of PMOS LDOs supply voltage supervisors provides reduced power consumption and longer battery life in handheld and portable battery powered systems such as PDAs, palmtops, cellphones and other systems utilizing the emerging 2.5 V logic functions.

The TPS71025 uses a voltage controlled PMOS pass transistor. In contrast, bipolar regulators use a pnp pass element, the base current of which is directly proportional to the load current through the regulator. The PMOS pass transistor results in very low quiescent currents (typically 292 µA) that remain virtually constant over the regulator’s full specified 500 mA output load. This pass transistor also acts as a low value resistor, less than one ohm, so the dropout voltage is extremely low when compared to conventional bipolar LDOs. Typical dropout voltage under a 100 mA load, for instance, is a mere 95 mV maximum.

The TPS71025’s 2.5 V output is regulated to ± 2% voltage tolerance over the full specified range for line, load and temperature changes. For additional power savings, a TTL logic-enabled standby mode reduces power consumption to 0.5 µA maximum. This addresses a critical requirement to extend battery life in power sensitive applications. This device is available in the ultra-thin TSSOP package for space sensitive applications.

The TPS71025 is available in 20-pin TSSOP, 8-pin SOIC and 8-pin DIP.

Vol 24 November, 1997