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ADP2105 Datasheet(PDF) 1 Page - Analog Devices

No. de Pieza. ADP2105
Descripción  1 Amp/1.5 Amp/2 Amp Synchronous, Step-Down DC-to-DC Converters
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Página de inicio  http://www.analog.com
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ADP2105 Datasheet(HTML) 1 Page - Analog Devices

 
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1 Amp/1.5 Amp/2 Amp Synchronous,
Step-Down DC-to-DC Converters
ADP2105/ADP2106/ADP2107
Rev. 0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other
rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.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
www.analog.com
Fax: 781.461.3113
©2006 Analog Devices, Inc. All rights reserved.
FEATURES
Extremely high 97% efficiency
Ultralow quiescent current: 20 μA
1.2 MHz switching frequency
0.1 μA shutdown supply current
Maximum load current:
ADP2105: 1 A
ADP2106: 1.5 A
ADP2107: 2 A
Input voltage: 2.7 V to 5.5 V
Output voltage: 0.8 V to VIN
Maximum duty cycle: 100%
Smoothly transitions into low dropout (LDO) mode
Internal synchronous rectifier
Small 16-lead 4 mm × 4 mm LFCSP_VQ package
Optimized for small ceramic output capacitors
Enable/Shutdown logic input
Undervoltage lockout
Soft start
APPLICATIONS
Mobile handsets
PDAs and palmtop computers
Telecommunication/Networking equipment
Set top boxes
Audio/Video consumer electronics
GENERAL DESCRIPTION
The ADP2105/ADP2106/ADP2107 are low quiescent current,
synchronous, step-down dc-to-dc converters in a compact 4 mm ×
4 mm LFCSP_VQ package. At medium-to-high load currents,
these devices use a current-mode, constant-frequency pulse
width modulation (PWM) control scheme for excellent stability
and transient response. To ensure the longest battery life in
portable applications, the ADP2105/ADP2106/ADP2107 use a
pulse frequency modulation (PFM) control scheme under light
load conditions that reduces switching frequency to save power.
The ADP2105/ADP2106/ADP2107 run from input voltages of
2.7 V to 5.5 V, allowing single Li+/Li− polymer cell, multiple
alkaline/NiMH cells, PCMCIA, and other standard power sources.
The output voltage of ADP2105/ADP2106/ADP2107-ADJ is
adjustable from 0.8 V to the input voltage, while the ADP2105/
ADP2106/ADP2107-xx are available in preset output voltage
options of 3.3 V, 1.8 V, 1.5 V, and 1.2 V. Each of these variations is
available in three maximum current levels, 1 A (ADP2105), 1.5 A
(ADP2106), and 2 A (ADP2107). The power switch and synchro-
nous rectifier are integrated for minimal external part count
and high efficiency. During logic-controlled shutdown, the
input is disconnected from the output, and it draws less than
0.1 μA from the input source. Other key features include
undervoltage lockout to prevent deep-battery discharge and
programmable soft start to limit inrush current at startup.
TYPICAL PERFORMANCE CHARACTERISTICS
100
75
0
2000
LOAD CURRENT (mA)
95
90
85
80
200
400
600
800 1000 1200 1400 1600 1800
VIN =3.3V
VIN =3.6V
VIN =5V
VOUT =2.5V
Figure 1. Efficiency vs. Load Current for the ADP2107 with VOUT = 2.5 V
TYPICAL OPERATING CIRCUIT
ADP2107-ADJ
OFF
EN
SS
LX2
FB
PWIN1
AGND
OUTPUT VOLTAGE = 2.5V
COMP
ON
PGND
IN
GND
GND
GND
NC
GND
LX1
PWIN2
VIN
VIN INPUT VOLTAGE = 2.7V TO 5.5V
10μF
FB
1nF
70kΩ
120pF
1
2
3
4
12
11
10
9
16
15
14
13
5
6
7
8
2μH
4.7μF
LOAD
0A TO 2A
10μF
10μF
10Ω
0.1μF
NC = NO CONNECT
85kΩ
40kΩ
FB
Figure 2. Circuit Configuration of ADP2107 with VOUT = 2.5 V


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