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ADP2504 Schematic ( PDF Datasheet ) - Analog Devices
| Teilenummer | ADP2504 |
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| Beschreibung | DC-to-DC Converters | |
| Hersteller | Analog Devices | |
| Logo |  |
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Gesamt 16 Seiten 
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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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
 
ADP2503/ADP2504
Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
700
600
500
400 VOUT = 2.8V
VOUT = 3.3V
300 VOUT = 3.5V
VOUT = 4.2V
200 VOUT = 4.5V
VOUT = 5.0V
100
0
2.3 2.8 3.3 3.8 4.3 4.8 5.3
INPUT VOLTAGE (V)
Figure 3. ADP2503 Output Current vs. Input Voltage
100
90
80
70
60
50
40
30
20
10
0
0.001
0.01
IOUT (A)
VIN = 5.5V
VIN = 4.2V
VIN = 3.6V
VIN = 2.3V
0.1
1
Figure 6. Efficiency vs. Output Current, PSM and PWM Mode (VOUT = 5.0 V)
1100
1000
900
800
700
VOUT = 2.8V
600 VOUT = 3.3V
500 VOUT = 3.5V
400 VOUT = 4.2V
VOUT = 4.5V
300 VOUT = 5.0V
200
100
0
2.3 2.8 3.3 3.8 4.3 4.8 5.3
INPUT VOLTAGE (V)
Figure 4. ADP2504 Output Current vs. Input Voltage
100
90
80
70
60
50
40
30
20
10
0
0.001
0.01
IOUT (A)
VIN = 5.5V
VIN = 4.2V
VIN = 3.6V
VIN = 2.3V
0.1
1
Figure 7. Efficiency vs. Output Current, PWM Mode (VOUT = 3.3 V)
100
90
80
70
60
50
40
30
20
10
0
0.001
0.01
IOUT (A)
VIN = 5.5V
VIN = 4.2V
VIN = 3.6V
VIN = 2.3V
0.1
1
Figure 5. Efficiency vs. Output Current, PWM Mode (VOUT = 5.0 V)
100
90
80
70
60
50
40
30
20
10
0
0.001
0.01
IOUT (A)
VIN = 5.5V
VIN = 4.2V
VIN = 3.6V
VIN = 2.3V
0.1
1
Figure 8. Efficiency vs. Output Current, PSM and PWM Mode (VOUT = 3.3 V)
Rev. D | Page 6 of 16
6 Page 
ADP2503/ADP2504
UNDERVOLTAGE LOCKOUT
The undervoltage lockout circuit prevents the device from oper-
ating incorrectly at low input voltages. It prevents the converter
from turning on the power switches under undefined conditions
and, therefore, prevents deep discharge of the battery supply.
VIN must be greater than 2.25 V to enable the converter. During
operation, if VIN drops below 2.10 V, the ADP2503/ADP2504 are
disabled until the supply exceeds the UVLO rising threshold.
THERMAL SHUTDOWN
When the junction temperature, TJ, exceeds 150°C typical,
the device goes into thermal shutdown. In this mode, the power
switches are turned off. The device resumes operation when the
junction temperature again falls below 125°C typical.
Data Sheet
SHORT-CIRCUIT PROTECTION
When the nominal inductor peak current value of 1.5 A is
reached, the ADP2503/ADP2504 first switch off the NMOS2
transistor if it is active. If the current thereafter continues to
increase by an extra amount of 200 mA, the PMOS1 transistor
is also switched off. This operation is reversible when the short
circuit stops. It allows the inductor current ripple to be mini-
mized close to 1.5 A and, thus, the controller to restore VOUT
even if a high load current is maintained after the short circuit.
REVERSE CURRENT LIMIT
In case of a short circuit on VOUT to a value greater than
expected, the inductor current becomes negative (reverse
current). The negative peak value is limited to 1.1 A by
deactivating the PMOS2 switch.
Rev. D | Page 12 of 16
12 Page | ||
| Seiten | Gesamt 16 Seiten | |
| PDF Download | [ ADP2504 Schematic.PDF ] | |
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