LP3985是TI公司的一款单通道LDO产品，LP3985是微功耗，150mA 低噪声超低压降 CMOS 电压稳压器，本页介绍了LP3985的产品说明、应用、特性等，并给出了与LP3985相关的TI元器件型号供参考。
LP3985 - 微功耗，150mA 低噪声超低压降 CMOS 电压稳压器 - 单通道LDO - 线性稳压器(LDO) - TI公司（Texas Instruments，德州仪器）
- 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
- CDMA Cellular Handsets
- Wideband CDMA Cellular Handsets
- GSM Cellular Handsets
- Portable Information Appliances
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 x 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.
| PART NUMBER | PACKAGE | BODY SIZE |
|---|---|---|
| LP3985 | DSBGA (5) | 1.502 mm x 1.045 mm (MAX) |
| SOT-23 (5) | 2.90 mm x 1.60 mm (NOM) |
