Overview
The ADP2138ACBZ-2.8-R7 is a high-efficiency, low quiescent current, synchronous step-down DC-to-DC converter produced by Analog Devices Inc. This component is part of the ADP2138 series and is specifically configured to provide a fixed output voltage of 2.8V. It is designed to operate with an input voltage range of 2.3V to 5.5V and can deliver a maximum load current of 800 mA. The device features an internal synchronous rectifier, compensation, and soft start, along with current overload and thermal shutdown protections for robust operation.
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) | -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 | |
| 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 synchronous rectifier, compensation, and soft start
- Current overload and thermal shutdown protections
- Ultralow shutdown current: 0.2 μA (typical)
- Forced PWM and automatic PWM/PSM modes
- Supported by ADIsimPower™ design tool
- MODE pin to select between PWM mode and power save mode
- Fixed frequency, current-mode PWM control architecture
- Power save mode at light loads to lower regulation power losses
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 ADP2138ACBZ-2.8-R7?
The input voltage range is from 2.3V to 5.5V.
- What is the maximum output current of the ADP2138ACBZ-2.8-R7?
The maximum output current is 800 mA.
- What are the operating modes of the ADP2138ACBZ-2.8-R7?
The device operates in either forced PWM mode or automatic PWM/PSM mode, controlled by the MODE pin.
- What is the oscillator frequency of the ADP2138ACBZ-2.8-R7?
The oscillator frequency is between 2.6 MHz and 3.4 MHz.
- What are the thermal shutdown characteristics of the ADP2138ACBZ-2.8-R7?
The thermal shutdown threshold is 150°C with a hysteresis of 20°C.
- What is the shutdown current of the ADP2138ACBZ-2.8-R7?
The shutdown current is typically 0.2 μA.
- What are the typical applications of the ADP2138ACBZ-2.8-R7?
Typical applications include PDAs, wireless handsets, digital audio players, digital cameras, and GPS navigation units.
- How does the ADP2138ACBZ-2.8-R7 manage power at light loads?
The device shifts to a power save mode at light loads to lower regulation power losses and improve efficiency.
- What design tool supports the ADP2138ACBZ-2.8-R7?
The ADP2138ACBZ-2.8-R7 is supported by the ADIsimPower™ design tool.
- What is the package type of the ADP2138ACBZ-2.8-R7?
The device is available in a 6-pin WLCSP (Wafer Level Chip Scale Package) and 6-UFBGA (Ultra Fine Pitch Ball Grid Array).
