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Analog Devices Semiconductor Electronic Components Datasheet

ADP2504 Datasheet

DC-to-DC Converters

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ADP2504 pdf
Data Sheet
600 mA/1000 mA, 2.5 MHz Buck-Boost
DC-to-DC Converters
ADP2503/ADP2504
FEATURES
GENERAL DESCRIPTION
1 mm height profile
Compact PCB footprint
Seamless transition between modes
38 μA typical quiescent current
2.5 MHz operation enables 1.5 μH inductor
Input voltage: 2.3 V to 5.5 V
Fixed output voltage: 2.8 V to 5.0 V
Adjustable model output voltage range: 2.8 V to 5.5 V
600 mA (ADP2503) and 1000 mA (ADP2504) output options
Boost converter configuration with load disconnect
SYNC pin with three different modes
Power save mode (PSM) for improved light load efficiency
Forced fixed frequency operation mode
Synchronization with external clock
Internal compensation
Soft start
Enable/shutdown logic input
Overtemperature protection
Short-circuit protection
Undervoltage lockout protection
Small 10-lead 3 mm × 3 mm LFCSP (QFN) package
Supported by ADIsimPower™ design tool
APPLICATIONS
Wireless handsets
Digital cameras/portable audio players
Miniature hard disk power supplies
USB powered devices
The ADP2503/ADP2504 are high efficiency, low quiescent current
step-up/step-down dc-to-dc converters that can operate at input
voltages greater than, less than, or equal to the regulated output
voltage. The power switches and synchronous rectifiers are
internal to minimize external device count. At high load currents,
the ADP2503/ADP2504 use a current-mode, fixed frequency
pulse-width modulation (PWM) control scheme for optimal
stability and transient response. To ensure the longest battery life
in portable applications, the ADP2503/ADP2504 have an optional
power save mode that reduces the switching frequency under
light load conditions. For wireless and other low noise applica-
tions where variable frequency power save mode may cause
interference, the logic control input sync forces fixed frequency
PWM operation under all load conditions.
The ADP2503/ADP2504 can run from input voltages between
2.3 V and 5.5 V, allowing single lithium or lithium polymer cell,
multiple alkaline or NiMH cells, PCMCIA, USB, and other stan-
dard power sources. The ADP2503/ADP2504 have fixed output
options, or using the adjustable model, the output voltage can
be programmed through an external resistor divider. Compensa-
tion is internal to minimize the number of external components.
During logic-controlled shutdown, the input is disconnected
from the output and draws less than 1 μA from the input source.
Operating as boost converters, the ADP2503/ADP2504 feature a
true load disconnect function that isolates the load from the
power source. Other key features include undervoltage lockout
to prevent deep battery discharge, and soft start to prevent input
current overshoot at startup.
TYPICAL APPLICATION CIRCUIT
1.5µH
VIN
2.3V TO 5.5V
10µF
SW1
SW2
ADP2503/ADP2504
PVIN
VOUT
VIN FB
VOUT
2.8V TO 5V
22µF
SYNC1
EN AGND PGND
ON
OFF
1ALLOWS THE ADP2503/ADP2504 TO OPERATE IN
THREE DIFFERENT MODES.
Figure 1.
Rev. D
Document Feedback
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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
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2008–2015 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com


Analog Devices Semiconductor Electronic Components Datasheet

ADP2504 Datasheet

DC-to-DC Converters

No Preview Available !

ADP2504 pdf
ADP2503/ADP2504
TABLE OF CONTENTS
Features .............................................................................................. 1 
Applications....................................................................................... 1 
General Description ......................................................................... 1 
Typical Application Circuit ............................................................. 1 
Revision History ............................................................................... 2 
Specifications..................................................................................... 3 
Absolute Maximum Ratings............................................................ 4 
Thermal Data ................................................................................ 4 
Thermal Resistance ...................................................................... 4 
ESD Caution.................................................................................. 4 
Pin Configuration and Function Descriptions............................. 5 
Typical Performance Characteristics ............................................. 6 
Theory of Operation ...................................................................... 11 
Power Save Mode........................................................................ 11 
REVISION HISTORY
10/15—Rev. C to Rev. D
Changes to Figure 3 and Figure 4................................................... 6
Changes to Figure 15, Figure 16, and Figure 17 ........................... 8
Changes to Figure 22 and Figure 23............................................... 9
8/13—Rev. B to Rev. C
Change to Features Section ............................................................. 1
Added ADIsimPower Design Tool Section................................. 13
Updated Outline Dimensions ....................................................... 16
Changes to Ordering Guide .......................................................... 16
6/10—Rev. A to Rev. B
Changes to Ordering Guide .......................................................... 16
Data Sheet
Soft Start ...................................................................................... 11 
SYNC Function........................................................................... 11 
Enable........................................................................................... 11 
Undervoltage Lockout ............................................................... 12 
Thermal Shutdown .................................................................... 12 
Short-Circuit Protection............................................................ 12 
Reverse Current Limit ............................................................... 12 
Applications Information .............................................................. 13 
ADIsimPower Design Tool ....................................................... 13 
Inductor Selection ...................................................................... 13 
Output Voltage Programming .................................................. 14 
PCB Layout Guidelines.................................................................. 15 
Outline Dimensions ....................................................................... 16 
Ordering Guide .......................................................................... 16 
8/09—Rev. 0 to Rev. A
Changes to Features Section, Figure 1, and General Description
Section.................................................................................................1
Changes to Feedback Voltage Parameter and EN, SYNC
Leakage Current Parameter, Table 1 ...............................................3
Changes to Table 2 and Thermal Resistance Section ...................4
Added Thermal Data Section ..........................................................4
Changes to Figure 2 and Table 4......................................................5
Changes to Figure 12.........................................................................7
Changes to Figure 17.........................................................................8
Changes to SYNC Function Section ............................................ 11
Changes to Undervoltage Lockout Section................................. 12
Changes to Table 6.......................................................................... 13
Added Output Voltage Programming Section ........................... 14
Added Figure 30; Renumbered Sequentially .............................. 14
Changes to Ordering Guide .......................................................... 16
10/08—Revision 0: Initial Version
Rev. D | Page 2 of 16


Part Number ADP2504
Description DC-to-DC Converters
Maker Analog Devices
Total Page 16 Pages
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