PDF ADP3334 Data sheet ( Hoja de datos )

Número de pieza	ADP3334
Descripción	High Accuracy Low IQ/ 500 mA anyCAP Adjustable Low Dropout Regulator
Fabricantes	Analog Devices
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No Preview Available ! a High Accuracy Low IQ, 500 mA anyCAP® Adjustable Low Dropout Regulator FEATURES High Accuracy Over Line and Load: ؎0.9% @ 25؇C, ؎1.8% over Temperature Ultralow Dropout Voltage: 200 mV (Typ) @ 500 mA Requires Only CO = 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 –40؇C to +85؇C 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 ADP3334 FUNCTIONAL BLOCK DIAGRAM IN Q1 THERMAL PROTECTION CC DRIVER SD ADP3334 OUT gm BANDGAP REF FB GND 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 www.DaatarcShhieteect4tuUr.ecormequires 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. VIN CIN 1␮F ADP3334 I N OUT I N OUT SD OFF ON FB GND R1 CNR R2 VOUT COUT 1␮F 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. anyCAP is a registered 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 that 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 www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 2001 1 page ADP3334 2.210 2.200 2.190 2.189 2.179 3.500 3.000 VOUT = 2.2V RL = 4.4⍀ CL = 1␮F 40 80 140 180 TIME – ␮s TPC 10. Line Transient Response 2.210 2.200 2.190 2.189 2.179 3.500 3.000 VOUT = 2.2V RL = 4.4⍀ CL = 10␮F 40 80 140 180 TIME – ␮s TPC 11. Line Transient Response 2.3 2.2 2.1 400 200 VIN = 6V VOUT = 2.2V 0 CL = 1␮F 200 400 600 TIME – ␮s 800 TPC 12. Load Transient Response 2.3 2.2 2.1 400 200 VOUT = 2.2V VIN = 6V 0 CL = 10␮F 200 400 600 800 TIME – ␮s TPC 13. Load Transient Response 2.2 0 FULL SHORT 3 800m⍀ SHORT 2 1 VIN = 4V 0 200 400 600 TIME – ␮s 800 TPC 14. Short Circuit Current –20 VOUT = 2.2V –30 CL = 1␮F –40 IL = 500mA www.DataS–h50eet4ICULL.=c=5o10m␮␮FA –60 CL = 10␮F IL = 500mA –70 –80 CL = 10␮F IL = 50␮A –90 10 100 1k 10k 100k 1M 10M FREQUENCY – Hz TPC 16. Power Supply Ripple Rejection 160 VOUT = 2.0V 140 CNR = 10nF 120 100 80 IL = 500mA WITHOUT NOISE REDUCTION IL = 500mA WITH NOISE REDUCTION 60 IL = 0mA WITHOUT NOISE REDUCTION 40 20 IL = 0mA WITH NOISE REDUCTION 0 0 10 20 30 CL – ␮F 40 50 TPC 17. RMS Noise vs. CL (10 Hz–100 kHz) 2 1␮F 1 0 2 0 10␮F 10␮F 1␮F VIN = 6V VOUT = 2.2V RL = 4.4⍀ 200 400 600 TIME – ␮s 800 TPC 15. Turn Off/On Response 100 VOUT = 2.2V IL = 1mA 10 CL = 10␮F CL = 10␮F CNR = 10nF CNR = 0 CL = 1␮F 1 CNR = 0 0.1 0.01 CL = 1␮F CNR = 10nF 0.001 10 100 1k 10k 100k FREQUENCY – Hz 1M TPC 18. Output Noise Density REV. 0 –5– 5 Page

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