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Analog Devices Semiconductor Electronic Components Datasheet

ADP1708 Datasheet

(ADP1706 - ADP1708) CMOS Linear Regulator

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ADP1708 pdf
FEATURES
Maximum output current: 1 A
Input voltage range: 2.5 V to 5.5 V
Low shutdown current: <1 μA
Low dropout voltage: 345 mV @ 1 A load
Initial accuracy: ±1%
Accuracy over line, load, and temperature: ±2.5%
16 fixed output voltage options with soft start:
0.75 V to 3.3 V (ADP1706)
16 fixed output voltage options with tracking
0.75 V to 3.3 V (ADP1707)
Adjustable output voltage option:
0.8 V to 5.0 V (ADP1708)
Stable with small 4.7 μF ceramic output capacitor
Excellent load/line transient response
Current limit and thermal overload protection
Logic-controlled enable
Available in an 8-lead, exposed paddle SOIC and
3 mm × 3 mm, 8-lead exposed paddle LFCSP
APPLICATIONS
Notebook computers
Memory components
Telecommunications equipment
Network equipment
DSP/FPGA/microprocessor supplies
Instrumentation equipment/data acquisition systems
GENERAL DESCRIPTION
The ADP1706/ADP1707/ADP1708 are CMOS, low dropout
linear regulators that operate from 2.5 V to 5.5 V and provide
up to 1 A of output current. Using an advanced proprietary
architecture, they provide high power supply rejection and
achieve excellent line and load transient response with a small
4.7 μF ceramic output capacitor.
The ADP1706/ADP1707 are available in 16 fixed output volt-
age options. The ADP1708 is available in an adjustable version,
which allows output voltages that range from 0.8 V to 5.0 V via
an external divider. The ADP1706 allows an external soft start
capacitor to be connected to program the start-up time; the
1 A, Low Dropout,
CMOS Linear Regulator
ADP1706/ADP1707/ADP1708
TYPICAL APPLICATION CIRCUITS
VIN = 5V
4.7µF
ADP1706
10nF
1 EN
SS 8
2 GND SENSE 7
3 IN
OUT 6
VOUT = 3.3V
4 IN
OUT 5
4.7µF
Figure 1. ADP1706 with Fixed Output Voltage, 3.3 V
ADP1707
VIN = 5V
4.7µF
1 EN
2 GND
3 IN
4 IN
TRK 8
SENSE 7
OUT 6
OUT 5
VOUT (V)
VTRK
VOUT
4.7µF
3
2
1
0 12345
VTRK (V)
Figure 2. ADP1707 with Output Voltage Tracking
VIN = 5V
4.7µF
ADP1708
1 EN
2 GND
3 IN
4 IN
ADJ 8
SENSE 7
OUT 6
OUT 5
R2
R1
VOUT = 0.8V(1 + R1/R2)
4.7µF
Figure 3. ADP1708 with Adjustable Output Voltage, 0.8 V to 5.0 V
ADP1707 and ADP1708 contain internal soft start capacitors
that give a typical start-up time of 100 μs. The ADP1707
includes a tracking feature that allows the output to follow an
external voltage rail or reference.
The ADP1706/ADP1707/ADP1708 are available in an 8-lead,
exposed paddle SOIC package and an 8-lead, 3 mm × 3 mm
exposed paddle LFCSP, making them not only very compact
solutions but also providing excellent thermal performance for
applications requiring up to 1 A of output current in a small,
low profile footprint.
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.
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
©2007 Analog Devices, Inc. All rights reserved.
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Analog Devices Semiconductor Electronic Components Datasheet

ADP1708 Datasheet

(ADP1706 - ADP1708) CMOS Linear Regulator

No Preview Available !

ADP1708 pdf
ADP1706/ADP1707/ADP1708
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Typical Application Circuits............................................................ 1
General Description ......................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 5
Thermal Resistance ...................................................................... 5
ESD Caution.................................................................................. 5
Pin Configurations and Function Descriptions ........................... 6
Typical Performance Characteristics ............................................. 7
Theory of Operation ...................................................................... 10
REVISION HISTORY
6/07—Revision 0: Initial Version
Soft Start Function (ADP1706) ................................................ 10
Adjustable Output Voltage (ADP1708)................................... 11
Track Mode (ADP1707) ............................................................ 11
Enable Feature ............................................................................ 11
Application Information................................................................ 12
Capacitor Selection .................................................................... 12
Voltage Tracking Applications.................................................. 12
Current Limit and Thermal Overload Protection ................. 12
Thermal Considerations............................................................ 13
PCB Layout Considerations...................................................... 15
Outline Dimensions ....................................................................... 16
Ordering Guide .......................................................................... 17
Rev. 0 | Page 2 of 20
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Part Number ADP1708
Description (ADP1706 - ADP1708) CMOS Linear Regulator
Maker Analog Devices
Total Page 20 Pages
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