Overview
The ADP2140ACPZ1812R7, produced by Analog Devices Inc., is a highly integrated power management IC that combines a high-efficiency, low-quiescent current 600 mA step-down DC-DC converter with a 300 mA low-dropout (LDO) linear regulator. This device is packaged in a compact 10-lead, 3 mm x 3 mm LFCSP (Lead Frame Chip Scale Package). The ADP2140 is designed to optimize power efficiency and minimize component count, making it ideal for battery-powered and portable electronic devices. It operates from input voltages ranging from 2.3 V to 5.5 V, supporting various power sources including single Li+/Li− polymer cells, multiple alkaline/NiMH cells, and PCMCIA batteries.
Key Specifications
| Parameter | Value |
|---|---|
| Input Voltage Range | 2.3 V to 5.5 V |
| Output Current (Buck) | 600 mA |
| Output Current (LDO) | 300 mA |
| Quiescent Current (Buck) | 22 μA with zero load, 20 μA in PSM mode |
| Shutdown Current | < 0.3 μA |
| LDO Dropout Voltage | 110 mV @ 300 mA load |
| LDO PSRR | 65 dB @ 10 kHz, 55 dB @ 100 kHz at VOUT2 = 1.2 V |
| LDO Noise | 40 μV rms at VOUT2 = 1.2 V |
| Initial Accuracy | ±1% |
| Package Type | 10-lead LFCSP (3 mm x 3 mm) |
| Operating Temperature Range | −40°C to +125°C |
Key Features
- High-efficiency, low-quiescent current step-down DC-DC converter and low-dropout linear regulator.
- Power-saving variable frequency mode to reduce switching frequency under light loads.
- Low input voltage minimum for LDO (1.65 V), allowing it to be powered from the buck regulator output.
- Power-good indicator, soft start, and internal compensation.
- Optional enable sequencing through two enable inputs.
- Undervoltage lockout, short-circuit protection, and thermal overload protection.
- Compact 10-lead LFCSP package requiring only four external components.
Applications
- Mobile phones
- Personal media players
- Digital cameras and audio devices
- Portable and battery-powered equipment
Q & A
- What is the input voltage range of the ADP2140?
The ADP2140 operates from input voltages ranging from 2.3 V to 5.5 V. - What are the output currents for the buck and LDO regulators?
The buck regulator can deliver up to 600 mA, while the LDO regulator can deliver up to 300 mA. - What is the quiescent current of the buck regulator?
The quiescent current of the buck regulator is 22 μA with zero load and 20 μA in PSM mode. - What is the shutdown current of the ADP2140?
The shutdown current is less than 0.3 μA. - What is the LDO dropout voltage?
The LDO dropout voltage is 110 mV at a 300 mA load. - What is the PSRR of the LDO?
The PSRR of the LDO is 65 dB at 10 kHz and 55 dB at 100 kHz at VOUT2 = 1.2 V. - What is the noise level of the LDO?
The noise level of the LDO is 40 μV rms at VOUT2 = 1.2 V. - What is the initial accuracy of the ADP2140?
The initial accuracy is ±1%. - What is the package type and size of the ADP2140?
The ADP2140 is packaged in a 10-lead LFCSP (3 mm x 3 mm). - What are the key protection features of the ADP2140?
The ADP2140 includes undervoltage lockout, short-circuit protection, and thermal overload protection.
