Overview
The ADP2140ACPZ3325R7, 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 x 3 mm LFCSP, making it ideal for space-constrained applications. The ADP2140 is designed to optimize power efficiency and minimize component count, requiring only four external components for the total solution. It supports input voltages from 2.3 V to 5.5 V, making it suitable for various power sources including single Li+/Li− polymer cells, multiple alkaline/NiMH cells, and PCMCIA batteries.
Key Specifications
| Parameter | Symbol | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| Input Voltage Range | VIN1 | 2.3 | 5.5 | V | |
| Buck Output Accuracy | VOUT | -1.5% | +1.5% | % | |
| Transient Load Regulation | VTR-LOAD | 75 mV | mV | ||
| Transient Line Regulation | VTR-LINE | 25 mV | mV | ||
| Output Current (Buck) | IOUT | 600 mA | mA | ||
| Output Current (LDO) | IOUT | 300 mA | mA | ||
| Minimum Input Capacitance | CMIN | 7.5 µF | 10 µF | µF | |
| Minimum Output Capacitance (Buck) | CMIN | 10 µF | µF | ||
| Minimum Output Capacitance (LDO) | CMIN | 0.7 µF | 1.0 µF | µF | |
| Minimum Inductor Value | INDMIN | 0.7 µH | 1 µH | µH |
Key Features
- High Efficiency Step-Down Converter: The ADP2140 features a 600 mA step-down DC-DC converter with a proprietary high-speed current-mode, constant frequency, pulse-width modulation (PWM) control scheme for excellent stability and transient response.
- Low Quiescent Current LDO: A 300 mA low dropout linear regulator designed to operate in a split supply mode, allowing it to be powered from the output of the buck regulator, thus increasing efficiency and reducing power dissipation.
- Power Saving Variable Frequency Mode: Reduces switching frequency under light loads to ensure the longest battery life in portable applications.
- Power Sequencing Options: User-selectable power sequencing through two enable inputs, including autosequencing mode where the highest voltage output enables on the rising edge of EN1.
- Soft Start and Internal Compensation: Prevents input current overshoot at startup and ensures stable operation.
- Protection Features: Includes undervoltage lockout, short-circuit protection, and thermal overload protection to ensure reliable operation.
- Low Input Voltage Minimum: The LDO can operate with VIN2 as low as 1.65 V, allowing it to be powered from the buck regulator's output.
Applications
- Portable Electronics: Ideal for battery-powered devices such as smartphones, tablets, and handheld gaming consoles due to its high efficiency and low quiescent current.
- Industrial Control Systems: Suitable for use in industrial control systems where compact size and high reliability are crucial.
- Medical Devices: Can be used in medical devices that require efficient power management and compact design.
- Aerospace and Defense: Applicable in aerospace and defense systems where high reliability and efficiency are essential.
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 for the buck converter and LDO?
The buck converter can deliver up to 600 mA, and the LDO can deliver up to 300 mA.
- What type of packaging does the ADP2140 use?
The ADP2140 is packaged in a 10-lead, 3 mm x 3 mm LFCSP.
- What are the key features of the ADP2140's buck converter?
The buck converter features high efficiency, a proprietary high-speed current-mode PWM control scheme, and a power saving variable frequency mode.[
- Does the ADP2140 have any protection features?
Yes, the ADP2140 includes undervoltage lockout, short-circuit protection, and thermal overload protection.[
- How does the ADP2140's LDO operate?
The LDO is a low quiescent current, low dropout linear regulator that can operate in a split supply mode and be powered from the output of the buck regulator.[
- What are the minimum capacitance requirements for the ADP2140?
The minimum input capacitance is 7.5 µF, the minimum output capacitance for the buck is 10 µF, and the minimum output capacitance for the LDO is 0.7 µF.[
- What is the minimum inductor value required for the ADP2140?
The minimum inductor value is 0.7 µH.[
- Can the ADP2140 be used in industrial control systems?
Yes, the ADP2140 is suitable for use in industrial control systems due to its high reliability and compact design.[
- What are some common applications of the ADP2140?
The ADP2140 is commonly used in portable electronics, industrial control systems, medical devices, and aerospace and defense systems.[
