Overview
The ADP2140ACPZ1228R7, produced by Analog Devices Inc., is a highly integrated power management IC that combines a high-efficiency step-down DC-DC converter with a low-dropout linear regulator (LDO). This device is designed to optimize power efficiency and reduce component count in portable and battery-powered applications. The ADP2140 features a 600 mA step-down buck regulator and a 300 mA LDO, both packaged in a compact 10-lead LFCSP (Lead Frame Chip Scale Package) measuring 3 mm x 3 mm. The buck regulator uses a proprietary high-speed current-mode, constant frequency, pulse-width modulation (PWM) control scheme for excellent stability and transient response. The LDO is designed for low quiescent current and low dropout voltage, making it suitable for split supply modes and efficient operation from the buck regulator's output.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 2.3 to 5.5 | V |
| Buck Regulator Output Current | 600 | mA |
| LDO Output Current | 300 | mA |
| Switching Frequency | 3 | MHz |
| Operating Temperature Range | -40 to +125 | °C |
| Package Type | 10-Lead LFCSP | |
| Quiescent Current (Buck, PSM mode) | 20 | μA |
| Shutdown Current | < 0.3 | μA |
| LDO Dropout Voltage @ 300 mA | 110 | mV |
| LDO PSRR @ 10 kHz | 65 | dB |
Key Features
- High-efficiency 600 mA step-down DC-DC converter and 300 mA LDO in a single package.
- Low quiescent current: 22 μA with zero load, 20 μA in PSM mode for the buck regulator.
- Low shutdown current: less than 0.3 μA.
- Low LDO dropout voltage: 110 mV at 300 mA load.
- High LDO PSRR: 65 dB at 10 kHz and 55 dB at 100 kHz.
- Low noise LDO: 40 μV rms at VOUT2 = 1.2 V.
- Initial accuracy: ±1%.
- Current-limit and thermal overload protection.
- Power-good indicator and optional enable sequencing.
- Soft start to prevent input current overshoot at startup.
- Undervoltage lockout to prevent deep battery discharge.
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 input voltage range of the ADP2140 is from 2.3 V to 5.5 V.
- What are the output currents of the buck regulator and LDO?
The buck regulator can deliver up to 600 mA, and the LDO can deliver up to 300 mA.
- What is the switching frequency of the buck regulator?
The switching frequency of the buck regulator is 3 MHz.
- What is the operating temperature range of the ADP2140?
The operating temperature range is from -40°C to +125°C.
- What type of package does the ADP2140 come in?
The ADP2140 comes in a 10-Lead LFCSP package.
- What is the quiescent current of the buck regulator in PSM mode?
The quiescent current in PSM mode is 20 μA.
- What is the shutdown current of the ADP2140?
The shutdown current is less than 0.3 μA.
- What are some key protection features of the ADP2140?
The ADP2140 includes current-limit, thermal overload protection, and undervoltage lockout.
- Does the ADP2140 have a power-good indicator?
Yes, the ADP2140 includes a power-good indicator.
- What are some typical applications of the ADP2140?
Typical applications include mobile phones, personal media players, digital cameras, and other portable and battery-powered equipment.
