ADP2139
PRODUCTIONCompact, 800 mA, 3 MHz, Step-Down DC-to-DC Converter with an Internal Discharge Switch
- Part Models
- 9
- 1ku List Price
- Starting From $1.35
Overview
- Input voltage: 2.3 V to 5.5 V
- Peak efficiency: 95%
- 3 MHz fixed frequency operation
- Typical quiescent current: 23 μA
- Very small solution size
- 6-lead, 1 mm × 1.5 mm WLCSP package
- Fast load and line transient response
- 100% duty cycle low dropout mode
- 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
The ADP2138 and ADP2139 are high efficiency, low quiescent current, synchronous step-down dc-to-dc converters. The ADP2139 has the additional feature of an internal discharge switch. The total solution requires only three tiny external components. When the MODE pin is set high, the buck regulator operates in forced PWM mode, which provides low peak-to-peak ripple for power supply noise sensitive loads at the expense of light load efficiency. When the MODE pin is set low, the buck regulator automatically switches operating modes, depending on the load current level. At higher output loads, the buck regulator operates in PWM mode. When the load current falls below a predefined threshold, the regulator operates in power save mode (PSM), improving light load efficiency.
The ADP2138/ADP2139 operate on input voltages of 2.3 V to 5.5 V, which allows for single lithium or lithium polymer cell, multiple alkaline or NiMH cell, PCMCIA, USB, and other standard power sources. The maximum load current of 800 mA is achievable across the input voltage range.
The ADP2138/ADP2139 are available in fixed output voltages of 3.3 V, 3.0 V, 2.8 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V, 1.0 V, and 0.8 V. All versions include an internal power switch and synchronous rectifier for minimal external part count and high efficiency. The ADP2138/ADP2139 have internal soft start and they are internally compensated. During logic controlled shutdown, the input is disconnected from the output and the ADP2138/ADP2139 draw 0.2 μA (typical) from the input source.
Other key features include undervoltage lockout to prevent deep battery discharge, and soft start to prevent input current overshoot at startup. The ADP2138/ADP2139 are available in a 6-ball wafer level chip scale package (WLCSP).
Applications
- PDAs and palmtop computers
- Wireless handsets
- Digital audio, portable media players
- Digital cameras, GPS navigation units
Documentation
Data Sheet 1
User Guide 1
Analog Dialogue 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| ADP2139ACBZ-0.8-R7 | 6-Ball WLCSP (1.5mm x 1mm) | ||
| ADP2139ACBZ-1.0-R7 | 6-Ball WLCSP (1.5mm x 1mm) | ||
| ADP2139ACBZ-1.2-R7 | 6-Ball WLCSP (1.5mm x 1mm) | ||
| ADP2139ACBZ-1.5-R7 | 6-Ball WLCSP (1.5mm x 1mm) | ||
| ADP2139ACBZ-1.8-R7 | 6-Ball WLCSP (1.5mm x 1mm) | ||
| ADP2139ACBZ-2.5-R7 | 6-Ball WLCSP (1.5mm x 1mm) | ||
| ADP2139ACBZ-2.8-R7 | 6-Ball WLCSP (1.5mm x 1mm) | ||
| ADP2139ACBZ-3.0-R7 | 6-Ball WLCSP (1.5mm x 1mm) | ||
| ADP2139ACBZ-3.3-R7 | 6-Ball WLCSP (1.5mm x 1mm) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 28, 2012 - 11_0175 Shipping Changes for WLCSP Products with 8mm Carrier Tape Width |
||
| ADP2139ACBZ-0.8-R7 | PRODUCTION | |
| ADP2139ACBZ-1.0-R7 | PRODUCTION | |
| ADP2139ACBZ-1.2-R7 | PRODUCTION | |
| ADP2139ACBZ-1.5-R7 | PRODUCTION | |
| ADP2139ACBZ-1.8-R7 | PRODUCTION | |
| ADP2139ACBZ-2.5-R7 | PRODUCTION | |
| ADP2139ACBZ-2.8-R7 | PRODUCTION | |
| ADP2139ACBZ-3.0-R7 | PRODUCTION | |
| ADP2139ACBZ-3.3-R7 | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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LTspice
Models for the following parts are available in LTspice:
- ADP2139-0.8
- ADP2139-1.0
- ADP2139-1.2
- ADP2139-1.5
- ADP2139-1.8
- ADP2139-2.5
- ADP2139-2.8
- ADP2139-3.0
- ADP2139-3.3
ADP21xx Buck Regulator Design Tool
Microsoft Excel download tool from ADIsimPower to generate a power supply design complete with a schematic, bill of materials, and performance specifications.
Open ToolLTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.
Evaluation Kits
ADP2139 Evaluation Board