Overview
The ADP2139ACBZ-2.8-R7 is a high-efficiency, low quiescent current, synchronous step-down DC-to-DC converter produced by Analog Devices Inc. This device is designed to provide a compact and efficient power solution, requiring only three external components for operation. It features an internal discharge switch, which is particularly useful for quickly discharging the output capacitor when the enable pin goes low or when the device enters shutdown mode.
The ADP2139 operates with a fixed frequency, current-mode PWM control architecture at medium to high loads, and shifts to a power save mode at light loads to minimize power losses. This dual-mode operation ensures high efficiency across a wide range of load conditions.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Voltage Range | 2.3 | 5.5 | V | |
| Output Voltage | 2.8 | V | ||
| Output Current | 800 | mA | ||
| Output Voltage Accuracy (PWM mode) | -2 | +2 | % | |
| Line Regulation (VIN = 2.3 V to 5.5 V, PWM mode) | 0.25 | %/V | ||
| Load Regulation (ILOAD = 0 mA to 800 mA, PWM mode) | -0.95 | %/A | ||
| DC Operating Current (ILOAD = 0 mA, device not switching) | 23 | 30 | μA | |
| Shutdown Current (EN = 0 V, TA = TJ = -40°C to +85°C) | 0.2 | 1.0 | μA | |
| SW On Resistance (PFET) | 155 | 240 | mΩ | |
| SW On Resistance (NFET) | 115 | 200 | mΩ | |
| Current Limit (PFET switch peak current limit) | 1100 | 1500 | 1650 | mA |
| Oscillator Frequency | 2.6 | 3.0 | 3.4 | MHz |
| Start-Up Time | 250 | μs | ||
| Thermal Shutdown Threshold | 150 | °C |
Key Features
- High efficiency, low quiescent current synchronous step-down DC-to-DC converter
- Internal discharge switch for quick output capacitor discharge
- Fixed frequency, current-mode PWM control architecture at medium to high loads
- Automatic switching to power save mode at light loads for improved efficiency
- Low peak-to-peak ripple in forced PWM mode for noise-sensitive loads
- Ultralow shutdown current of 0.2 μA (typical)
- Current overload and thermal shutdown protections
- Compact 6-pin WLCSP package
- Supported by ADIsimPower™ design tool
Applications
- PDAs and palmtop computers
- Wireless handsets
- Digital audio and portable media players
- Digital cameras and GPS navigation units
Q & A
- What is the input voltage range of the ADP2139ACBZ-2.8-R7?
The input voltage range is from 2.3 V to 5.5 V.
- What is the typical output voltage of the ADP2139ACBZ-2.8-R7?
The typical output voltage is 2.8 V.
- What is the maximum output current of the ADP2139ACBZ-2.8-R7?
The maximum output current is 800 mA.
- What are the operating modes of the ADP2139ACBZ-2.8-R7?
The device operates in forced PWM mode or automatic PWM/PSM modes depending on the load current level.
- What is the oscillator frequency of the ADP2139ACBZ-2.8-R7?
The oscillator frequency is between 2.6 MHz and 3.4 MHz.
- Does the ADP2139ACBZ-2.8-R7 have thermal shutdown protection?
Yes, it has thermal shutdown protection with a threshold of 150°C.
- What is the shutdown current of the ADP2139ACBZ-2.8-R7?
The shutdown current is typically 0.2 μA.
- What package type does the ADP2139ACBZ-2.8-R7 come in?
The device comes in a compact 6-pin WLCSP package.
- What design tool supports the ADP2139ACBZ-2.8-R7?
The device is supported by the ADIsimPower™ design tool.
- What are some typical applications of the ADP2139ACBZ-2.8-R7?
Typical applications include PDAs, wireless handsets, digital audio players, digital cameras, and GPS navigation units.
