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ADP2138 Datasheet

Compact 800mA 3 MHz Step-Down DC-to-DC Converter

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ADP2138 pdf
Data Sheet
Compact, 800 mA, 3 MHz,
Step-Down DC-to-DC Converter
ADP2138/ADP2139
FEATURES
GENERAL DESCRIPTION
Input voltage: 2.3 V to 5.5 V
Peak efficiency: 95%
3 MHz fixed frequency operation
Typical quiescent current: 24 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
Supported by ADIsimPower™ design tool
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.
APPLICATIONS
PDAs and palmtop computers
Wireless handsets
Digital audio, portable media players
Digital cameras, GPS navigation units
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 rect-
ifier 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 over-
shoot at startup. The ADP2138/ADP2139 are available in a 6-ball
wafer level chip scale package (WLCSP).
TYPICAL APPLICATIONS CIRCUIT
2.3V TO 5.5V
4.7µF
VIN SW
ADP2138/
ADP2139
ON
OFF
EN
VOUT
FORCE
PWM
AUTO
MODE
GND
1.0µH
Figure 1.
VOUT
4.7µF
Rev. C
Document Feedback
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responsibilityisassumedbyAnalogDevices for itsuse,nor foranyinfringementsofpatentsor other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2011–2013 Analog Devices, Inc. All rights reserved.
Technical Support
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Analog Devices Semiconductor Electronic Components Datasheet

ADP2138 Datasheet

Compact 800mA 3 MHz Step-Down DC-to-DC Converter

No Preview Available !

ADP2138 pdf
ADP2138/ADP2139
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
General Description ......................................................................... 1
Typical Applications Circuit............................................................ 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Input and Output Capacitor, Recommended Specifications.. 3
Absolute Maximum Ratings............................................................ 4
Thermal Resistance ...................................................................... 4
ESD Caution.................................................................................. 4
Pin Configuration and Function Descriptions............................. 5
Typical Performance Characteristics ............................................. 6
Theory of Operation ...................................................................... 11
Control Scheme .......................................................................... 11
PWM Mode................................................................................. 11
Power Save Mode........................................................................ 11
Enable/Shutdown ....................................................................... 11
REVISION HISTORY
1/13—Rev. B to Rev. C
Change to Figure 18, Caption ........................................................ 8
Change to Figure 28, Caption ....................................................... 10
6/12—Rev. A to Rev. B
Change to Features Section ............................................................. 1
Added ADIsimPower Design Tool Section................................. 13
Changes to Ordering Guide .......................................................... 17
4/11—Rev. 0 to Rev. A
Change to Features Section ............................................................. 1
Added Figure 32, Renumbered Figures Sequentially ................ 10
Changes to Ordering Guide .......................................................... 16
1/11—Revision 0: Initial Version
Data Sheet
Short-Circuit Protection............................................................ 12
Undervoltage Lockout ............................................................... 12
Thermal Protection.................................................................... 12
Soft Start ...................................................................................... 12
Current Limit .............................................................................. 12
100% Duty Operation................................................................ 12
Discharge Switch ........................................................................ 12
Applications Information .............................................................. 13
ADIsimPower Design Tool ....................................................... 13
External Component Selection ................................................ 13
Thermal Considerations............................................................ 14
PCB Layout Guidelines.............................................................. 14
Evaluation Board ............................................................................ 15
Evaluation Board Layout ........................................................... 15
Outline Dimensions ....................................................................... 16
Ordering Guide .......................................................................... 17
Rev. C | Page 2 of 20
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Part Number ADP2138
Description Compact 800mA 3 MHz Step-Down DC-to-DC Converter
Maker Analog Devices
Total Page 20 Pages
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