REV.
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. 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 companies.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 www.analog.com
Fax: © Analog Devices, Inc. All rights reserved.
ADP3334
High Accuracy, Low I
Q
, anyCAP
®
Adjustable Low Dropout Regulator
FEATURES
High Accuracy over Line and Load: 0.9% @ 25C,
1.8% over Temperature
500 mA Current Capability
Ultralow Dropout Voltage
Requires Only C
O
= 1.0 F for Stability
anyCAP = Stable with Any Type of Capacitor
(Including MLCC)
Current and Thermal Limiting
Low Noise
Low Shutdown Current: < 1.0 A (Typ)
2.6 V to 11 V Supply Range
1.5 V to 10 V Output Range
–40C to +85C Ambient Temperature Range
APPLICATIONS
Cellular Phones
TFT LCD Modules
Camcorders, Cameras
Networking Systems, DSL/Cable Modems
Cable Set-Top Boxes
DSP Supplies
Personal Digital Assistants
GENERAL DESCRIPTION
The ADP3334 is a member of the ADP333x family of precision
low dropout anyCAP voltage regulators. The ADP3334 operates
with an input voltage range of 2.6 V to 11 V and delivers a
continuous load current up to 500 mA. The novel anyCAP
architecture requires only a very small 1 µF output capacitor for
stability, and the LDO is insensitive to the capacitor’s equivalent
series resistance (ESR). This makes the ADP3334 stable with any
capacitor, including ceramic (MLCC) types for space restricted
applications.
The ADP3334 achieves exceptional accuracy of ±0.9% at room
temperature and ±1.8% over temperature, line, and load. The
dropout voltage of the ADP3334 is only 200 mV (typical) at
500 mA. This device also includes a safety current limit, ther-
mal overload protection, and a shutdown feature. In shutdown
mode, the ground current is reduced to less than 1 µA. The
ADP3334 has low quiescent current of 90 µA (typical) in light
load situations.
FUNCTIONAL BLOCK DIAGRAM
THERMAL
PROTECTION
CC
IN
ADP3334
OUT
GND
Q1
BAND GAP
REF
DRIVER
g
m
FB
SD
The ADP3334 is available in three different package options:
1. Excellent thermal capability, space saving 3 mm ⫻ 3 mm LFCSP.
2. Popular low profile MSOP-8.
3. Traditional thermal enhanced SOIC-8.
C
NR
ADP3334
OUT
V
IN
IN
GND
V
OUT
ON
OFF
IN
OUT
R1
R2
SD
C
IN
1F
FB
C
OUT
1F
Figure 1. Typical Application Circuit
