DC-to-DC Converters. ADP2504 Datasheet

ADP2504 Converters. Datasheet pdf. Equivalent

ADP2504 Datasheet
Recommendation ADP2504 Datasheet
Part ADP2504
Description DC-to-DC Converters
Feature ADP2504; Data Sheet 600 mA/1000 mA, 2.5 MHz Buck-Boost DC-to-DC Converters ADP2503/ADP2504 FEATURES GENERA.
Manufacture Analog Devices
Datasheet
Download ADP2504 Datasheet




Analog Devices ADP2504
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
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Analog Devices ADP2504
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



Analog Devices ADP2504
Data Sheet
ADP2503/ADP2504
SPECIFICATIONS
VIN = 3.6 V, VOUT = 3.3 V, @ TA = TJ = −40°C to +125°C for minimum/maximum specifications and TA = 25°C for typical specifications,
unless otherwise noted.1
Table 1.
Parameters
INPUT CHARACTERISTICS
Input Voltage Range
Undervoltage Lockout Threshold
OUTPUT CHARACTERISTICS
Output Voltage Range
Feedback Impedance
Feedback Voltage
Output Voltage Initial Accuracy
Load and Line Regulation
CURRENT CHARACTERISTICS
Quiescent Current (VIN)
Shutdown Current
SWITCH CHARACTERISTICS
N-Channel Switches
P-Channel Switches
P-Channel Leakage
Switch Current Limit
ADP2504
ADP2503
Reverse Current Limit
OSCILLATOR AND STARTUP
Oscillator Frequency
On Time PMOS1 (Buck Mode)
On Time NMOS2 (Boost Mode)
SYNC Clock Frequency
SYNC Clock Minimum Off Time
LOGIC LEVEL CHARACTERISTICS
EN, SYNC Input High Threshold
EN, SYNC Input Low Threshold
EN, SYNC Leakage Current
THERMAL CHARACTERISTICS
Thermal Shutdown Threshold
Thermal Shutdown Hysteresis
Conditions
VIN rising
VIN falling
ADP2503/ADP2504 adjustable output (PWM operation, no load)
ADP2503/ADP2504 fixed output (PWM operation, no load)
VIN = 2.3 V to 3.6 V, ILOAD = 0 mA to 500 mA, forced PWM mode
VIN = 2.3 V to 5.5 V, ILOAD = 0 mA to 500 mA, forced PWM mode
IOUT = 0 mA, VIN = EN = 3.6 V, device not switching
TA = TJ = −40°C to +125°C
VIN = 3.6 V
VIN = VOUT = 3.6 V
TJ = −40°C to +125°C
Minimum duty cycle = 30%
Maximum duty cycle = 50% (×2)
VEN = VIN, VSYNC = VIN
Min Typ Max Unit
2.3 5.5 V
2.15 2.20 2.25 V
2.10 2.14 2.20 V
2.8 5.5 V
450 kΩ
490 500 510 mV
−2 +2 %
0.5 %
0.6 %
38 50
0.2 1
μA
μA
150
150
1
μA
1.3 2.0 A
1.0 1.4 A
1.1 A
2.1 2.5
130
2.2
160
2.9 MHz
ns
200 ns
2.8 MHz
ns
1.2 V
0.4 V
−1 +0.1 +1 μA
150 °C
25 °C
1 All limits at temperature extremes are guaranteed via correlation using standard statistical quality control (SQC).
Rev. D | Page 3 of 16







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