a
High Accuracy anyCAP™*
100 mA Low Dropout Linear Regulator
ADP3301
FEATURES
High Accuracy (Over Line and Load Regulations
at +25؇C): ؎0.8%
Ultralow Dropout Voltage: 100 mV Typical @ 100 mA
Requires Only CO = 0.47 F for Stability
anyCAP™* = Stable with All Types of Capacitors
Current and Thermal Limiting
Low Noise
Dropout Detector
Low Shutdown Current: 1 A
Several Fixed Voltage Options
3.0 V to 12 V Supply Range
–20؇C to +85؇C Ambient Temperature Range
Thermally Enhanced SO-8 Package
Excellent Line and Load Regulations
APPLICATIONS
Cellular Telephones
Notebook, Palmtop Computers
Battery Powered Systems
Portable Instruments
Post Regulator for Switching Supplies
Bar Code Scanners
GENERAL DESCRIPTION
The ADP3301 is a member of the ADP330x family of precision
low dropout anyCAP™* voltage regulators. The ADP3301
stands out from the conventional LDOs with a novel architecture, an enhanced process and a new package. Its patented
design includes a noninverting wideband driver and a stage that
permits the use of an internal “pole splitting” capacitor to
stabilize the feedback loop with a single output capacitor as
small as 0.47 µF. This device is stable with any type of capacitor
regardless of its ESR (Equivalent Serial Resistance) value,
including ceramic types (MLCC) for space restricted applications. The ADP3301 achieves exceptional accuracy of ± 0.8% at
room temperature and ± 1.4% overall accuracy over temperature, line and load regulations. The dropout voltage of the
ADP3301 is only 100 mV (typical) at 100 mA.
FUNCTIONAL BLOCK DIAGRAM
THERMAL
PROTECTION
ERR
OUT
R1
CC
Q2
DRIVER
Gm
SD
R2
BANDGAP
REF
GND
The ADP3301 operates with a wide input voltage range from
3 V to 12 V and delivers a load current in excess of 100 mA. It
features an error flag that signals when the device is about to
lose regulation or when the short circuit or thermal overload
protection is activated. Other features include shutdown and
optional noise reduction capabilities. The ADP330x anyCAP™*
LDO family offers a wide range of output voltages and output
current levels from 50 mA to 300 mA:
ADP3300 (50 mA, SOT-23)
ADP3302 (100 mA, Dual Output)
ADP3304 (100 mA, Dual Output with Separate Grounds)
ADP3303 (200 mA)
ADP3306 (300 mA)
NR 3
ADP3301-5.0
VIN
7
1
IN
OUT
8
2
C1
0.47µF
ERR 6
VOUT = +5V
R1
330kΩ
C2
0.47µF
EOUT
4
5
In addition to the new architecture and process, ADI’s new
proprietary thermally enhanced package (Thermal Coastline)
can handle 1 W of power dissipation without external heat sink
or large copper surface on the PC board. This keeps PC board
real estate to a minimum and makes the ADP3301 very
attractive for use in portable equipment.
ADP3301
Q1
IN
ON
OFF
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: 617/329-4700
World Wide Web Site: http://www.analog.com
Fax: 617/326-8703
© Analog Devices, Inc., 1997
