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ADP2106_15

更新时间： 2024-11-15 01:14:07
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亚德诺 - ADI /
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36页 1000K
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1 Amp/1.5 Amp/2 Amp Synchronous, Step-Down DC-to-DC Converters

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1 Amp/1.5 Amp/2 Amp Synchronous,  
Step-Down DC-to-DC Converters  
Data Sheet  
ADP2105/ADP2106/ADP2107  
FEATURES  
GENERAL DESCRIPTION  
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 is adjustable  
from 0.8 V to the input voltage (indicated by ADJ), whereas the  
ADP2105/ADP2106/ADP2107 are available in preset output  
voltage options of 3.3 V, 1.8 V, 1.5 V, and 1.2 V (indicated by x.x 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 synchronous 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  
Supported by ADIsimPower™ design tool  
APPLICATIONS  
Mobile handsets  
PDAs and palmtop computers  
Telecommunication/networking equipment  
Set top boxes  
Audio/video consumer electronics  
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  
FB  
16  
V
= 3.3V  
IN  
15  
14  
IN PWIN1  
LX2  
13  
95  
90  
85  
80  
75  
FB GND  
ON  
OUTPUT VOLTAGE = 2.5V  
1
2
3
4
12  
EN  
OFF  
2μH  
PGND  
11  
10  
9
GND  
GND  
GND  
10μF 4.7μF  
85kΩ  
V
= 5V  
IN  
ADP2107-ADJ  
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. Efficiency vs. Load Current for the ADP2107 with VOUT = 2.5 V  
Figure 1. Circuit Configuration of ADP2107 with VOUT = 2.5 V  
Rev. D  
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  
rightsof third parties that may result fromits 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 andregisteredtrademarks are the property of their respective owners.  
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 ©2006–2012 Analog Devices, Inc. All rights reserved.  
 
 
 
 
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