1 Amp/1.5 Amp/2 Amp Synchronous,
Step-Down DC-to-DC Converters
ADP2105/ADP2106/ADP2107
GENERAL DESCRIPTION
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
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.
Soft start
APPLICATIONS
Mobile handsets
PDAs and palmtop computers
Telecommunication/Networking equipment
Set top boxes
Audio/Video consumer electronics
TYPICAL PERFORMANCE CHARACTERISTICS
TYPICAL OPERATING CIRCUIT
0.1μF
V
INPUT VOLTAGE = 2.7V TO 5.5V
10Ω
IN
100
10μF
V
= 2.5V
OUT
V
= 3.6V
IN
V
= 3.3V
FB
IN
16
15
14
IN PWIN1
LX2 12
13
95
90
85
80
75
FB GND
ON
OUTPUT VOLTAGE = 2.5V
1
2
3
4
EN
OFF
2μH
PGND
11
10
9
GND
GND
GND
10μF 4.7μF
85kΩ
ADP2107-ADJ
V
= 5V
IN
LX1
FB
V
IN
40kΩ
PWIN2
LOAD
COMP SS AGND NC
5
0A TO 2A
10μF
6
7
8
1nF
70kΩ
120pF
0
200 400 600 800 1000 1200 1400 1600 1800 2000
LOAD CURRENT (mA)
NC = NO CONNECT
Figure 2. Circuit Configuration of ADP2107 with VOUT = 2.5 V
Figure 1. Efficiency vs. Load Current for the ADP2107 with VOUT = 2.5 V
Rev. 0
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.
Trademarks and registeredtrademarks arethe property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
Fax: 781.461.3113
www.analog.com
©2006 Analog Devices, Inc. All rights reserved.
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