ADP2503 Datasheet PDF - Analog Devices
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600 mA/1000 mA, 2.5 MHz Buck-Boost
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
Enable/shutdown logic input
Undervoltage lockout protection
Small 10-lead 3 mm × 3 mm LFCSP (QFN) package
Supported by ADIsimPower™ design tool
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
2.3V TO 5.5V
2.8V TO 5V
EN AGND PGND
1ALLOWS THE ADP2503/ADP2504 TO OPERATE IN
THREE DIFFERENT MODES.
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
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
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.
PIN CONFIGURATION AND FUNCTION DESCRIPTIONS
(Not to scale)
1. CONNECT THE EXPOSED PAD TO PGND.
Figure 2. Pin Configuration
Table 4. Pin Function Descriptions
Pin No. Mnemonic Description
Output of the ADP2503/ADP2504. Connect the output capacitor between VOUT and PGND.
2 SW2 Power Switch 2 Connection. This is the internal connection to the input PMOS and NMOS switches. Connect
SW2 to the inductor with a short, wide track.
Power GND. Connect the input and output capacitors and the PGND pin to a PGND plane.
4 SW1 Power Switch 1 Connection. This is the internal connection to the output PMOS and NMOS switches. Connect
SW1 to the inductor with a short, wide track.
5 PVIN Power Input. This the input to the buck-boost power switches. Place a 10 μF capacitor between PVIN and
PGND as close as possible to the ADP2503/ADP2504.
Enable. Drive EN high to turn on the ADP2503/ADP2504. Bring EN low to put the device into shutdown mode.
The SYNC pin permits the ADP2503/ADP2504 to operate in three different modes.
Normal operation: with SYNC driven low, the ADP2503/ADP2504 operate at 2.5 MHz PWM mode for heavy
and medium loads, and moves to power save mode (PSM) mode for light loads.
Forced PWM operation: with SYNC driven high, the ADP2503/ADP2504 operate at fixed 2.5 MHz PWM mode
for all load conditions.
SYNC mode: to synchronize the ADP2503/ADP2504 switching to an external signal, drive this pin with a clock
between 2.2 MHz and 2.8 MHz. The SYNC signal must have on and off times greater than 160 ns.
Analog Power Supply. This is the supply for the ADP2503/ADP2504 internal circuitry.
Output Feedback. This is an input to the internal error amplifier and must be connected to VOUT on fixed
output versions; for the adjustable model, this is the voltage feedback.
EP Exposed pad Connect the exposed pad to PGND.
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|ADP2503||The function is DC-to-DC Converters.|
|ADP2504||The function is DC-to-DC Converters.|
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