ADP3309(1998) Ver la hoja de datos (PDF) - Analog Devices
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ADP3309 Datasheet PDF : 8 Pages
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FEATURES
؎1.2% Accuracy Over Line and Load Regulations @ +25؇C
Ultralow Dropout Voltage: 120 mV Typical @ 100 mA
Requires Only CO = 0.47 F for Stability
anyCAP = Stable with All Types of Capacitors
(Including MLCC)
Current and Thermal Limiting
Low Noise
Low Shutdown Current: 1 A
3.0 V to 12 V Supply Range
–20؇C to +85؇C Ambient Temperature Range
Several Fixed Voltage Options
Ultrasmall SOT-23-5 Package
Excellent Line and Load Regulations
APPLICATIONS
Cellular Telephones
Notebook, Palmtop Computers
Battery Powered Systems
PCMCIA Regulator
Bar Code Scanners
Camcorders, Cameras
anyCAP™ 100 mA
Low Dropout Linear Regulator
ADP3309
FUNCTIONAL BLOCK DIAGRAM
IN
ERR/NC
Q2
SD
THERMAL
PROTECTION
Q1
DRIVER
ADP3309
CC
OUT
R1
GM
R2
BANDGAP
REF
GND
GENERAL DESCRIPTION
The ADP3309 is a member of the ADP330x family of precision
low dropout anyCAP voltage regulators. It is pin-for-pin and
functionally compatible with National’s LP2981, but offers
performance advantages. The ADP3309 stands out from con-
ventional LDOs with a novel architecture and an enhanced
process. Its patented design requires only a 0.47 µF output
capacitor for stability. This device is stable with any type of
capacitor regardless of its ESR (Equivalent Series Resistance)
value, including ceramic types for space restricted applications.
The ADP3309 achieves ± 1.2% accuracy at room temperature
and ± 2.2% overall accuracy over temperature, line and load
regulations. The dropout voltage of the ADP3309 is only
120 mV (typical) at 100 mA. This device also includes a current
limit and a shutdown feature. In shutdown mode, the ground
current is reduced to ~1 µA.
The ADP3309 operates with a wide input voltage range from
3.0 V to 12 V and delivers a load current in excess of 100 mA.
The ADP3309 anyCAP LDO offers a wide range of output
voltages. For a 50 mA version, refer to the ADP3308 data sheet.
ERR/NC
VIN
C1 +
0.47F –
ADP3309-3.3
IN
OUT
ON
OFF
VOUT = +3.3V
+ C2
– 0.47F
SD
GND
Figure 1. Typical Application Circuit
anyCAP is a trademark of Analog Devices, Inc.
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
which may result from its use. No license is granted by implication or
otherwise under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 World Wide Web Site: http://www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 1998
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