Overview
The LP5900SD-3.0/NOPB is a 150-mA ultra-low-noise Linear 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 LP5900 is notable for its class-leading noise performance without the need for an external noise bypass capacitor. It operates with 0.47-μF ceramic input and output capacitors and features logic-controlled enable, thermal-overload protection, and short-circuit protection. The device is available in various package options, including DSBGA and WSON packages, making it versatile for different application needs.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 2.5 | 5.5 | V | |
| Output Voltage Range | 1.5 | 4.5 | V | |
| Output Current | 0 | 150 | mA | |
| Junction Temperature Range | -40 | 125 | °C | |
| Output Voltage Tolerance | ±2% | % | ||
| Line Regulation | 0.05% | %V | ||
| Load Regulation | 0.001% | mA | ||
| PSRR at 1 kHz | 75 | dB | ||
| Dropout Voltage | 80 | mV | ||
| Quiescent Current (Enabled) | 25 | μA | ||
| Quiescent Current (Disabled) | < 1 | μA | ||
| Start-up Time | 150 | μs |
Key Features
- Ultra-low noise output: 6.5 μVRMS, eliminating the need for an external noise bypass capacitor.
- High PSRR: 75 dB at 1 kHz.
- Logic-controlled enable with internal 1-MΩ pull-down resistor.
- Thermal-overload and short-circuit protection.
- Low quiescent current: 25 μA (enabled), < 1 μA (disabled).
- Low dropout voltage: 80 mV typical.
- Stable operation with 0.47-μF ceramic input and output capacitors.
- No-load stability: remains stable and in regulation with no external load.
- Wide junction temperature range: -40°C to 125°C.
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 LP5900?
The input voltage range of the LP5900 is from 2.5 V to 5.5 V.
- What is the output voltage range of the LP5900?
The output voltage range of the LP5900 is from 1.5 V to 4.5 V.
- What is the maximum output current of the LP5900?
The maximum output current of the LP5900 is 150 mA.
- Does the LP5900 require an external noise bypass capacitor?
No, the LP5900 does not require an external noise bypass capacitor due to its internal noise reduction design.
- What type of capacitors are recommended for input and output stability?
Ceramic capacitors (dielectric types X5R or X7R) in the range of 0.47 μF to 10 μF are recommended.
- What is the PSRR of the LP5900 at 1 kHz?
The PSRR of the LP5900 at 1 kHz is 75 dB.
- What is the quiescent current of the LP5900 when enabled and disabled?
The quiescent current is 25 μA when enabled and less than 1 μA when disabled.
- What is the dropout voltage of the LP5900?
The dropout voltage of the LP5900 is typically 80 mV.
- Does the LP5900 have thermal and short-circuit protection?
- What is the junction temperature range for the LP5900?
The junction temperature range for the LP5900 is from -40°C to 125°C.
