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1 Amp/1.5 Amp/2 Amp Synchronous,
Step-Down DC-to-DC Converters
Data Sheet
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 V IN
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
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
ADP2105/ADP2106/ADP2107
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 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.
0.1μF
1 0Ω
V IN
INPUT VOLTAGE = 2.7V TO 5.5V
OFF
ON
1
EN
FB
16
FB
15
GND
14
IN
13
PWIN1
LX2 12
10μF
OUTPUT VOLTAGE = 2.5V
100
95
V IN = 3.3V
V IN = 3.6V
V OUT = 2.5V
2μH
90
2
GND
PGND 11
ADP2107-ADJ
85kΩ
10μF
4.7μF
V IN = 5V
3
GND
LX1 10
FB
85
4
GND
PWIN2 9
V IN
40kΩ
COMP
5
SS
6
AGND NC
7 8
10μF
LOAD
0A TO 2A
80
70kΩ
1nF
75
120pF
0
200
400
600
800
1000 1200 1400 1600 1800 2000
NC = NO CONNECT
Figure 1. Circuit Configuration of ADP2107 with V OUT = 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
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 registered trademarks are the property of their respective owners.
LOAD CURRENT (mA)
Figure 2. Efficiency vs. Load Current for the ADP2107 with V OUT = 2.5 V
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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ADP2105ACPZ 制造商:Analog Devices 功能描述:V REG 1A ADJ SMD LFCSP-16 2105
ADP2105ACPZ-1.2-R7 功能描述:IC REG BUCK SYNC 1.2V 1A 16LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR
ADP2105ACPZ-1.5 制造商:Analog Devices 功能描述:V REG 1A 1.5V SMD LFCSP-16 2105
ADP2105ACPZ-1.5-R7 功能描述:IC REG BUCK SYNC 1.5V 1A 16LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:500 系列:- 类型:切换式电容器（充电泵），反相 输出类型:固定 输出数:1 输出电压:-3V 输入电压:2.3 V ~ 5.5 V PWM 型:Burst Mode? 频率 - 开关:900kHz 电流 - 输出:100mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-6 细型，TSOT-23-6 包装:带卷 (TR) 供应商设备封装:TSOT-23-6 其它名称:LTC1983ES6-3#TRMTR
ADP2105ACPZ-1.8 制造商:Analog Devices 功能描述:V REG 1A 1.8V SMD LFCSP-16 2105
ADP2105ACPZ-1.8-R7 功能描述:IC REG BUCK SYNC 1.8V 1A 16LFCSP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:升压（升压） 输出类型:两者兼有 输出数:1 输出电压:5V，2 V ~ 16.5 V 输入电压:2 V ~ 16.5 V PWM 型:- 频率 - 开关:45kHz 电流 - 输出:50mA 同步整流器:无 工作温度:0°C ~ 70°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:8-PDIP
ADP2105ACPZ-3.3 制造商:Analog Devices 功能描述:V REG 1A 3.3V SMD LFCSP-16 2105
ADP2105ACPZ-3.3R7 制造商:Rochester Electronics LLC 功能描述: 制造商:Analog Devices 功能描述: