Overview
The LP5907UVE-2.85/NOPB is a low-noise, low-dropout linear voltage regulator (LDO) produced by Texas Instruments. This device is designed to meet the stringent requirements of RF and analog circuits, offering low noise, high power supply rejection ratio (PSRR), low quiescent current, and minimal line or load transient response. The LP5907 can supply up to 250mA of output current and is available with fixed output voltages ranging from 1.2V to 4.5V in 25mV steps. It operates with a stable 1µF ceramic input and output capacitor setup, eliminating the need for a separate noise bypass capacitor. The device also features remote output capacitor placement, thermal-overload protection, and short-circuit protection, making it suitable for a variety of applications.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage Range | 2.2 | - | 5.5 | V |
| Output Voltage Range | 1.2 | - | 4.5 | V |
| Output Current | - | - | 250 | mA |
| Output Voltage Noise | - | < 6.5 | - | µVRMS |
| PSRR at 1 kHz | - | 82 | - | dB |
| Output Voltage Tolerance | - | ±2% | - | % |
| Quiescent Current (Enabled) | - | 12 | - | µA |
| Dropout Voltage (Typical) | - | 120 | - | mV |
| Operating Junction Temperature | -40 | - | 125 | °C |
| Input Capacitance | 0.7 | 1 | 10 | µF |
| Output Capacitance | 0.7 | 1 | 10 | µF |
Key Features
- Stable operation with 1µF ceramic input and output capacitors, no separate noise bypass capacitor required.
- Remote output capacitor placement capability.
- Thermal-overload and short-circuit protection.
- Low output voltage noise: < 6.5µVRMS.
- High PSRR: 82dB at 1kHz.
- Low quiescent current (enabled): 12µA.
- Low dropout voltage: 120mV (typical).
- Operating junction temperature range: –40°C to 125°C.
- Enable pin with internal 1MΩ resistor to GND for easy control.
- Automatic output discharge feature when the device is disabled.
Applications
- Smartphones and tablets.
- Digital cameras and audio devices.
- Portable and battery-powered equipment.
- Portable medical equipment.
- Smart meters and field transmitters.
- RF, PLL, VCO, and clock power supplies.
- IP cameras and drones.
Q & A
- What is the input voltage range of the LP5907? The input voltage range is from 2.2V to 5.5V.
- What is the output voltage range of the LP5907? The output voltage range is from 1.2V to 4.5V in 25mV steps.
- What type of capacitors are recommended for the LP5907? 1µF ceramic capacitors are recommended for both input and output.
- Does the LP5907 require a noise bypass capacitor? No, the LP5907 does not require a separate noise bypass capacitor.
- What is the typical quiescent current of the LP5907 when enabled? The typical quiescent current is 12µA.
- What is the dropout voltage of the LP5907? The typical dropout voltage is 120mV.
- What are the thermal protection features of the LP5907? The device features thermal-overload and short-circuit protection.
- What is the operating junction temperature range of the LP5907? The operating junction temperature range is from –40°C to 125°C.
- How does the enable pin function on the LP5907? The enable pin is internally held low by a 1MΩ resistor to GND and must be higher than the VIH threshold to enable the device.
- What happens to the output when the LP5907 is disabled? When the device is disabled, an automatic output discharge feature is activated.
