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ADP2107-1.8-EVAL

更新时间： 2024-11-14 04:04:39
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亚德诺 - ADI 转换器
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32页 1006K
描述
1 Amp/1.5 Amp/2 Amp Synchronous, Step-Down DC-to-DC Converters

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ADP2107-1.8-EVAL 数据手册

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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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