The LP3985 is designed for portable and wireless applications with demanding performance and space requirements. LP3985 performance is optimized for battery-powered systems to deliver ultra low noise, extremely low dropout voltage, and low quiescent current. Regulator ground current increases only slightly in dropout, further prolonging the battery life.
●The LP3985 is stable with a small 1-µF ±30% ceramic or high-quality tantalum output capacitor. The DSBGA requires the smallest possible PC board area the total application circuit area can be less than 2 mm × 2.5 mm, a fraction of a 1206 case size.
●An optional external bypass capacitor reduces the output noise without slowing down the load transient response. Fast startup time is achieved by utilizing an internal power-on circuit that actively pre-charges the bypass capacitor.
●Power supply rejection is better than 50 dB at low frequencies and starts to roll off at 1 kHz. High power supply rejection is maintained down to low input voltage levels common to battery operated circuits.
●The device is ideal for mobile phone and similar battery-powered wireless applications. It provides up to 150 mA, from a 2.5-V to 6-V input. The LP3985 consumes less than 1.5 µA in disable mode and has fast turn-on time less than 200 µs.
●The LP3985 is available with fixed output voltages from 2.5 V to 5 V. Contact Texas Instruments Sales for specific voltage option needs.
● Input Voltage: 2.5 V to 6 V
● 100-mV Maximum Dropout with 150-mA Load
● 150-mA Verified Output
● 50-dB PSRR at 1 kHz at VIN = VOUT \+ 0.2 V
● ≤ 1.5-µA Quiescent Current when Shut Down
● Fast Turn-On time: 200 µs (typ.)
● 30-µVRMS Output Noise (typical) over 10 Hz to 100
●kHz
● −40°C to 125°C Junction Temperature Range for
●Operation
● 2.5-V, 2.6-V, 2.7-V, 2.8-V, 2.85-V, 2.9-V, 3-V, 3.1-
●V, 3.2-V, 3.3-V, 4.7-V, 4.75-V, 4.8-V and 5-V
●Outputs Standard
● Logic Controlled Enable
● Stable with Ceramic and High-Quality Tantalum
●Capacitors
● Fast Turnon
● Thermal Shutdown and Short-Circuit Current Limit
