Overview
The LP5907SNX-3.2/NOPB, produced by Texas Instruments, is a 250-mA ultra-low-noise linear voltage regulator designed to meet the stringent requirements of RF and analog circuits. This device is optimized for low noise, high power supply rejection ratio (PSRR), low quiescent current, and minimal line and load transient response. It operates with a single 1-µF ceramic input capacitor and a single 1-µF ceramic output capacitor, eliminating the need for a separate noise bypass capacitor. The LP5907 is available in various packages, including DSBGA, X2SON, and SOT-23, and supports an operating junction temperature range of –40°C to 125°C.
Key Specifications
| Parameter | Value |
|---|---|
| Input Voltage Range | 2.2 V to 5.5 V |
| Output Voltage Range | 1.2 V to 4.5 V (in 25-mV steps) |
| Output Current | Up to 250 mA |
| Output Voltage Noise | < 6.5 µVRMS |
| PSRR at 1 kHz | 82 dB |
| Output Voltage Tolerance | ±2% |
| Quiescent Current (Enabled) | 12 µA |
| Low Dropout Voltage | 120 mV (typical) |
| Operating Junction Temperature | –40°C to 125°C |
| Thermal-Overload and Short-Circuit Protection | Yes |
Key Features
- Ultra-low noise performance without a separate noise bypass capacitor.
- High PSRR of 82 dB at 1 kHz.
- Low quiescent current: 12 µA (enabled) and < 1 µA (disabled).
- Stable operation with 1-µF ceramic input and output capacitors.
- Remote output capacitor placement up to 10 cm away from the device.
- Thermal-overload and short-circuit protection.
- Low dropout voltage of 120 mV (typical).
- Enable pin for ON/OFF control with automatic output discharge when disabled.
Applications
- Mobile phones 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.
- Communications equipment and factory automation.
Q & A
- What is the input voltage range of the LP5907?
The input voltage range of the LP5907 is 2.2 V to 5.5 V.
- What is the maximum output current of the LP5907?
The LP5907 can supply up to 250 mA of output current.
- 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 when enabled is 12 µA.
- What is the operating junction temperature range of the LP5907?
The operating junction temperature range is –40°C to 125°C.
- Does the LP5907 have thermal-overload and short-circuit protection?
Yes, the LP5907 includes thermal-overload and short-circuit protection.
- How can the LP5907 be turned ON or OFF?
The LP5907 can be turned ON or OFF using the enable (EN) pin. A voltage above the VIH threshold turns the device on, while a voltage below the VIL threshold turns it off.
- What is the typical dropout voltage of the LP5907?
The typical dropout voltage is 120 mV.
- Can the output capacitor be placed remotely from the LP5907?
Yes, the output capacitor can be placed up to 10 cm away from the LP5907 device with a reasonable PCB layout.
- What are some common applications of the LP5907?
The LP5907 is commonly used in mobile phones, tablets, digital cameras, portable medical equipment, and various RF and analog circuits.
