Overview
The LP5907SNX-4.5/NOPB from Texas Instruments is a 250mA, ultra-low-noise, low-IQ Linear Low-Dropout (LDO) voltage regulator. 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 low line or load transient response figures. The LP5907 is available in various packages, including DSBGA, X2SON, and SOT-23, and operates over an extended temperature range of –40°C to 125°C.
The device features a fixed output voltage range from 1.2V to 4.5V in 25mV steps, making it versatile for various applications. It is stable with 1µF ceramic input and output capacitors and does not require a separate noise bypass capacitor. The LP5907 also includes thermal-overload and short-circuit protection, ensuring reliable operation in demanding environments.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Voltage Range | TA = 25°C | 2.2 | 5.5 | V | |
| Output Voltage Range | 1.2 | 4.5 | V | ||
| Output Current | 0 | 250 | mA | ||
| Quiescent Current (Enabled) | VEN = 1.2V, IOUT = 1mA | 12 | µA | ||
| Dropout Voltage (Typical) | 120 | mV | |||
| Output Voltage Noise (RMS) | BW = 10Hz to 100kHz | < 6.5 | µVRMS | ||
| PSRR at 1kHz | IOUT = 20mA | 82 | dB | ||
| Output Voltage Tolerance | VIN = (VOUT(NOM) + 1V) to 5.5V, IOUT = 1mA to 250mA | -2 | 2 | % | |
| Operating Junction Temperature | -40 | 125 | °C |
Key Features
- Input voltage range: 2.2V to 5.5V
- Output voltage range: 1.2V to 4.5V in 25mV steps
- Stable with 1µF ceramic input and output capacitors; no separate noise bypass capacitor required
- Remote output capacitor placement up to 10 cm away from the device
- Thermal-overload and short-circuit protection
- Low output voltage noise: < 6.5µVRMS
- High PSRR: 82dB at 1kHz
- Very low quiescent current (enabled): 12µA
- Low dropout voltage: 120mV (typical)
- Enable pin with internal 1MΩ resistor to GND for easy control
- Automatic output discharge when disabled
Applications
- Smartphones
- Tablets
- Communications equipment
- Digital still cameras
- Factory automation
Q & A
- What is the input voltage range of the LP5907?
The input voltage range of the LP5907 is from 2.2V to 5.5V.
- What are the available output voltage options for the LP5907?
The LP5907 is available with fixed output voltages from 1.2V to 4.5V in 25mV steps.
- What type of capacitors are recommended for the LP5907?
The LP5907 is stable with 1µF ceramic input and output capacitors. X7R capacitors are recommended, but X5R, Y5V, and Z5U capacitors can also be used with proper consideration of the application conditions.
- 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 of the LP5907 when enabled is 12µA.
- What is the dropout voltage of the LP5907?
The typical dropout voltage of the LP5907 is 120mV.
- What is the PSRR of the LP5907 at 1kHz?
The PSRR of the LP5907 at 1kHz is 82dB.
- What are the thermal protection features of the LP5907?
The LP5907 includes thermal-overload and short-circuit protection.
- What is the operating junction temperature range of the LP5907?
The operating junction temperature range of the LP5907 is from –40°C to 125°C.
- How does the enable pin function on the LP5907?
The enable pin (EN) must be higher than the VIH threshold to enable the device and lower than the VIL threshold to disable it. There is an internal 1MΩ resistor between EN and GND.
