Overview
The LP5907MFX-2.9/NOPB, produced by Texas Instruments, is a 250mA, ultra-low-noise, low-IQ Linear Voltage Regulator (LDO). This device is designed to meet the stringent requirements of RF and analog circuits, offering exceptional noise performance, high power supply rejection ratio (PSRR), and low quiescent current. The LP5907 is stable with 1µF ceramic input and output capacitors and does not require a separate noise bypass capacitor. It is available in various industry-standard packages, including DSBGA, X2SON, and SOT-23, and operates over a junction temperature range of –40°C to 125°C.
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 |
| ESR of Input/Output Capacitors | 5 | 500 | mΩ |
Key Features
- Ultra-low noise performance: < 6.5 µVRMS output voltage noise.
- High PSRR: 82 dB at 1 kHz.
- Low quiescent current: 12 µA (enabled).
- Low dropout voltage: 120 mV (typical).
- Stable with 1µF ceramic input and output capacitors; no separate noise bypass capacitor required.
- Remote output capacitor placement: Output capacitor can be placed up to 10 cm away from the LDO.
- Thermal-overload and short-circuit protection.
- Output automatic discharge: Internal 230-Ω pulldown resistance to discharge the output when the device is disabled.
- Enable pin for on/off control with a logic input.
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.
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 is the output voltage range of the LP5907?
The output voltage range of the LP5907 is from 1.2V to 4.5V, available in 25mV steps.
- What is the maximum output current of the LP5907?
The LP5907 can supply up to 250mA of output current.
- What is the typical quiescent current of the LP5907 when enabled?
The typical quiescent current of the LP5907 when enabled is 12µA.
- Does the LP5907 require a noise bypass capacitor?
No, the LP5907 does not require a separate noise bypass capacitor.
- What is the PSRR of the LP5907 at 1 kHz?
The PSRR of the LP5907 at 1 kHz is 82 dB.
- 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 LP5907 handle thermal overload?
The LP5907 has thermal-overload protection that disables the output when the junction temperature rises to approximately 160°C and re-enables when it cools to approximately 145°C.
- Can the output capacitor be placed remotely from the LP5907?
- How does the enable pin control the LP5907?
The enable pin controls the LP5907 by turning it on when the voltage is above the VIH threshold and turning it off when the voltage is below the VIL threshold. When the device is disabled, an internal pulldown resistance discharges the output capacitor.
