Datasheet ADP2138, ADP2139 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | Compact, 800 mA, 3 MHz, Step-Down DC-to-DC Converter with an Internal Discharge Switch |
| Pages / Page | 20 / 1 — Compact, 800 mA, 3 MHz,. Step-Down DC-to-DC Converter. Data Sheet. … |
| Revision | C |
| File Format / Size | PDF / 551 Kb |
| Document Language | English |
Compact, 800 mA, 3 MHz,. Step-Down DC-to-DC Converter. Data Sheet. ADP2138/. ADP2139. FEATURES. GENERAL DESCRIPTION
Model Line for this Datasheet
Text Version of Document
Compact, 800 mA, 3 MHz, Step-Down DC-to-DC Converter Data Sheet ADP2138/ ADP2139 FEATURES GENERAL DESCRIPTION Input voltage: 2.3 V to 5.5 V
The ADP2138 and ADP2139 are high efficiency, low quiescent
Peak efficiency: 95%
current, synchronous step-down dc-to-dc converters. The
3 MHz fixed frequency operation
ADP2139 has the additional feature of an internal discharge
Typical quiescent current: 24 μA
switch. The total solution requires only three tiny external
Very small solution size
components. When the MODE pin is set high, the buck
6-lead, 1 mm × 1.5 mm WLCSP package
regulator operates in forced PWM mode, which provides low
Fast load and line transient response
peak-to-peak ripple for power supply noise sensitive loads at
100% duty cycle low dropout mode
the expense of light load efficiency. When the MODE pin is set
Internal synchronous rectifier, compensation, and soft start
low, the buck regulator automatical y switches operating modes,
Current overload and thermal shutdown protections
depending on the load current level. At higher output loads, the
Ultralow shutdown current: 0.2 μA (typical)
buck regulator operates in PWM mode. When the load current
Forced PWM and automatic PWM/PSM modes
falls below a predefined threshold, the regulator operates in power
Supported by ADIsimPower™ design tool
save mode (PSM), improving light load efficiency.
APPLICATIONS
The ADP2138/ADP2139 operate on input voltages of 2.3 V to
PDAs and palmtop computers
5.5 V, which al ows for single lithium or lithium polymer cel ,
Wireless handsets
multiple alkaline or NiMH cell, PCMCIA, USB, and other
Digital audio, portable media players
standard power sources. The maximum load current of 800 mA
Digital cameras, GPS navigation units
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 rect- ifier for minimal external part count and high efficiency. The ADP2138/ADP2139 have internal soft start and they are internal y 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 over- shoot at startup. The ADP2138/ADP2139 are available in a 6-ball wafer level chip scale package (WLCSP).
TYPICAL APPLICATIONS CIRCUIT 1.0µH 2.3V TO 5.5V VOUT VIN SW 4.7µF ADP2138/ 4.7µF ADP2139 ON OFF EN VOUT FORCE PWM MODE AUTO GND
001 09496- Figure 1.
Rev. C Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2011–2013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline Features Applications General Description Typical Applications Circuit Revision History Table of Contents Specifications Input and Output Capacitor, Recommended Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Control Scheme PWM Mode Power Save Mode Power Save Mode Current Threshold Enable/Shutdown Short-Circuit Protection Undervoltage Lockout Thermal Protection Soft Start Current Limit 100% Duty Operation Discharge Switch Applications Information ADIsimPower Design Tool External Component Selection Inductor Thermal Considerations PCB Layout Guidelines Evaluation Board Evaluation Board Layout Outline Dimensions Ordering Guide
The ADP2138 and ADP2139 are high efficiency, low quiescent
Peak efficiency: 95%
current, synchronous step-down dc-to-dc converters. The
3 MHz fixed frequency operation
ADP2139 has the additional feature of an internal discharge
Typical quiescent current: 24 μA
switch. The total solution requires only three tiny external
Very small solution size
components. When the MODE pin is set high, the buck
6-lead, 1 mm × 1.5 mm WLCSP package
regulator operates in forced PWM mode, which provides low
Fast load and line transient response
peak-to-peak ripple for power supply noise sensitive loads at
100% duty cycle low dropout mode
the expense of light load efficiency. When the MODE pin is set
Internal synchronous rectifier, compensation, and soft start
low, the buck regulator automatical y switches operating modes,
Current overload and thermal shutdown protections
depending on the load current level. At higher output loads, the
Ultralow shutdown current: 0.2 μA (typical)
buck regulator operates in PWM mode. When the load current
Forced PWM and automatic PWM/PSM modes
falls below a predefined threshold, the regulator operates in power
Supported by ADIsimPower™ design tool
save mode (PSM), improving light load efficiency.
APPLICATIONS
The ADP2138/ADP2139 operate on input voltages of 2.3 V to
PDAs and palmtop computers
5.5 V, which al ows for single lithium or lithium polymer cel ,
Wireless handsets
multiple alkaline or NiMH cell, PCMCIA, USB, and other
Digital audio, portable media players
standard power sources. The maximum load current of 800 mA
Digital cameras, GPS navigation units
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 rect- ifier for minimal external part count and high efficiency. The ADP2138/ADP2139 have internal soft start and they are internal y 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 over- shoot at startup. The ADP2138/ADP2139 are available in a 6-ball wafer level chip scale package (WLCSP).
TYPICAL APPLICATIONS CIRCUIT 1.0µH 2.3V TO 5.5V VOUT VIN SW 4.7µF ADP2138/ 4.7µF ADP2139 ON OFF EN VOUT FORCE PWM MODE AUTO GND
001 09496- Figure 1.
Rev. C Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 ©2011–2013 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com
Document Outline Features Applications General Description Typical Applications Circuit Revision History Table of Contents Specifications Input and Output Capacitor, Recommended Specifications Absolute Maximum Ratings Thermal Resistance ESD Caution Pin Configuration and Function Descriptions Typical Performance Characteristics Theory of Operation Control Scheme PWM Mode Power Save Mode Power Save Mode Current Threshold Enable/Shutdown Short-Circuit Protection Undervoltage Lockout Thermal Protection Soft Start Current Limit 100% Duty Operation Discharge Switch Applications Information ADIsimPower Design Tool External Component Selection Inductor Thermal Considerations PCB Layout Guidelines Evaluation Board Evaluation Board Layout Outline Dimensions Ordering Guide
