REV.0
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a
ADP3334
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 www.analog.com
Fax: 781/326-8703 © Analog Devices, Inc., 2001
High Accuracy Low I
Q
, 500 mA
anyCAP
®

Adjustable Low Dropout Regulator
FEATURES
High Accuracy Over Line and Load: H115500.9% @ 25H11543C,
H115501.8% over Temperature
Ultralow Dropout Voltage: 200 mV (Typ) @ 500 mA
Requires Only C
O
= 1.0 H9262F for Stability
anyCAP = Stable with Any Type of Capacitor
(Including MLCC)
Current and Thermal Limiting
Low Noise
Low Shutdown Current: < 1.0 H9262A (Typ)
2.6 V to 11 V Supply Range
1.5 V to 10 V Output Range
–40H11543C to +85H11543C Ambient Temperature Range
Thermally-Enhanced 8-Lead SO Package
APPLICATIONS
Cellular Phones
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 equiva-
lent series resistance (ESR). This makes 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 90 µA (typical) in light
load situations.
FUNCTIONAL BLOCK DIAGRAM
THERMAL
PROTECTION
CC
IN
ADP3334
OUT
GND
Q1
BANDGAP
REF
DRIVER
g
m
FB
SD
anyCAP is a registered trademark of Analog Devices, Inc.
C
NR
ADP3334
OUT
V
IN IN
GND
V
OUT
ON
OFF
IN
OUT
R1
R2
SD
C
IN
1H9262F FB
C
OUT
1H9262F
Figure 1. Typical Application Circuit
The ADP3334 also features ADI’s thermally enhanced Thermal
Coastline package. This allows 1 W of power dissipation without
any external heat sinking.