Overview
The ADP2140ACPZ1815R7, produced by Analog Devices Inc., is a highly integrated power management IC that combines a high-efficiency, low quiescent current step-down DC-DC converter with a low dropout linear regulator (LDO). This device is packaged in a compact 10-lead 3 mm × 3 mm LFCSP, making it ideal for space-constrained applications. The buck regulator can deliver up to 600 mA, while the LDO can provide up to 300 mA. The device 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 cards.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range (VIN1) | 2.3 | 5.5 | V | |
| Buck Output Current (IOUT) | 600 | mA | ||
| LDO Output Current | 300 | mA | ||
| Buck Output Accuracy (VOUT) | -1.5 | +1.5 | % | |
| Transient Load Regulation (VTR-LOAD) | 75 | mV | ||
| Transient Line Regulation (VTR-LINE) | 25 | mV | ||
| Switching Frequency | 3 | MHz | ||
| Operating Temperature | -40 | 125 | °C |
Key Features
- High-efficiency, low quiescent current step-down DC-DC converter and LDO regulator.
- Proprietary high-speed current-mode, constant frequency, pulse-width modulation (PWM) control scheme for excellent stability and transient response.
- Power-saving variable frequency mode to reduce switching frequency under light loads.
- Low dropout linear regulator (LDO) with low quiescent current, suitable for split supply mode.
- Power-good pin, soft start, and internal compensation.
- User-selectable power sequencing options through two enable inputs.
- Undervoltage lockout, short-circuit protection, and thermal overload protection.
- Compact 10-lead 3 mm × 3 mm LFCSP package.
Applications
- Portable electronics such as smartphones, tablets, and handheld devices.
- Battery-powered devices requiring efficient power management.
- PCMCIA cards and other small form factor devices.
- Industrial and medical devices requiring reliable and efficient power regulation.
Q & A
- What is the input voltage range of the ADP2140?
The input voltage range 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 provide up to 300 mA.
- What is the switching frequency of the buck regulator?
The switching frequency is 3 MHz.
- What are the key protection features of the ADP2140?
The device includes undervoltage lockout, short-circuit protection, and thermal overload protection.
- How does the power-saving mode work?
The device has a power-saving variable frequency mode to reduce switching frequency under light loads.
- What is the operating temperature range of the ADP2140?
The operating temperature range is from -40°C to +125°C.
- What package type is the ADP2140 available in?
The device is packaged in a 10-lead 3 mm × 3 mm LFCSP.
- Can the LDO be powered from the output of the buck regulator?
- What are the benefits of the soft start feature?
The soft start feature prevents input current overshoot at startup.
- How does the power sequencing work?
The device offers user-selectable power sequencing options through two enable inputs, including an autosequencing mode.
