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ADP2106 Arkusz danych(PDF) 1 Page - Analog Devices

Numer części ADP2106
Szczegółowy opis  1 Amp/1.5 Amp/2 Amp Synchronous, Step-Down DC-to-DC Converters
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ADP2106 Arkusz danych(HTML) 1 Page - Analog Devices

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1 Amp/1.5 Amp/2 Amp Synchronous,
Step-Down DC-to-DC Converters
Data Sheet
ADP2105/ADP2106/ADP2107
Rev. D
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother
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
©2006–2012 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 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
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.
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 1. Circuit Configuration of ADP2107 with VOUT = 2.5 V
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 2. Efficiency vs. Load Current for the ADP2107 with VOUT = 2.5 V


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