Overview
The LP5900SDX-3.3/NOPB is a 150-mA ultra-low-noise Linear Low-Dropout (LDO) regulator designed by Texas Instruments. This device is specifically tailored to meet the stringent requirements of RF and analog circuits, offering low noise, high Power Supply Rejection Ratio (PSRR), and low quiescent current. The LP5900SDX-3.3/NOPB operates with an input voltage range of 2.5 V to 5.5 V and provides an output voltage of 3.3 V. It is stable with 0.47-μF ceramic input and output capacitors and does not require a noise bypass capacitor, making it ideal for applications where space and noise performance are critical.
Key Specifications
| Parameter | Minimum | Typical | Maximum | Unit |
|---|---|---|---|---|
| Input Voltage Range | 2.5 | 5.5 | V | |
| Output Voltage Range | 1.5 | 4.5 | V | |
| Output Current | 150 | mA | ||
| Output Voltage Noise | 6.5 | μVRMS | ||
| PSRR at 1 kHz | 75 | dB | ||
| Output Voltage Tolerance | -2% | 2% | % | |
| Quiescent Current (Enabled) | 25 | μA | ||
| Quiescent Current (Disabled) | < 1 | μA | ||
| Dropout Voltage | 80 | mV | ||
| Junction Temperature Range | -40 | 125 | °C | |
| Start-up Time | 150 | μs |
Key Features
- Ultra-low noise output, 6.5 μVRMS
- High PSRR, 75 dB at 1 kHz
- Stable with 0.47-μF ceramic input and output capacitors, no noise bypass capacitor required
- Logic-controlled enable pin
- Thermal-overload and short-circuit protection
- Low quiescent current: 25 μA (enabled), < 1 μA (disabled)
- Low dropout voltage, 80 mV typical
- Operating junction temperature range: -40°C to 125°C
- Fast start-up time, 150 μs
Applications
- Cellular phones
- PDA handsets
- Wireless LAN devices
- Other portable and battery-powered devices requiring low noise and high PSRR
Q & A
- What is the input voltage range of the LP5900SDX-3.3/NOPB?
The input voltage range is from 2.5 V to 5.5 V.
- What is the output voltage of the LP5900SDX-3.3/NOPB?
The output voltage is 3.3 V.
- What type of capacitors are recommended for use with the LP5900SDX-3.3/NOPB?
Ceramic capacitors with a value of 0.47 μF are recommended for both input and output.
- Does the LP5900SDX-3.3/NOPB require a noise bypass capacitor?
No, it does not require a noise bypass capacitor.
- What is the maximum output current of the LP5900SDX-3.3/NOPB?
The maximum output current is 150 mA.
- What is the typical quiescent current when the device is enabled?
The typical quiescent current when enabled is 25 μA.
- What is the junction temperature range for the LP5900SDX-3.3/NOPB?
The junction temperature range is from -40°C to 125°C.
- What kind of protection does the LP5900SDX-3.3/NOPB have against overheating?
The device has thermal-overload protection that disables the output when the junction temperature rises to approximately 160°C and re-enables it when the temperature cools to approximately 140°C.
- How long does it take for the LP5900SDX-3.3/NOPB to start up?
The start-up time is 150 μs.
- What are some common applications for the LP5900SDX-3.3/NOPB?
Common applications include cellular phones, PDA handsets, and wireless LAN devices.
