Datasheet ADP1720 (Analog Devices)

50 mA, High Voltage, Micropower Linear Regulator ADP1720 FEATURES TYPICAL APPLICATION CIRCUITS Wide input voltage range: 4 V to 28 V ADP1720 FIXED Maximum output current: 50 mA 1 GND GND 8 Low light load current: V 2 IN GND 7 IN = 28V 28 μA at 0 μA load 1µF 3 OUT GND 6 35 μA at 100 μA load 4 EN GND 5 Low shutdown current: 0.7 μA VOUT = 5V
01
1µF
0 1-
Low dropout voltage: 275 mV @ 50 mA load
611 0
Initial accuracy: ±0.5%
Figure 1. ADP1720 with Fixed Output Voltage, 5.0 V
Accuracy over line, load, and temperature: ±2% Stable with small 1μF ceramic output capacitor ADP1720 R2 ADJUSTABLE Fixed 3.3 V and 5.0 V output voltage options 1 ADJ GND 8 Adjustable output voltage option: 1.225 V to 5.0 V R1 V 2 IN GND 7 IN = 12V Current limit and thermal overload protection 1µF 3 OUT GND 6 Logic controlled enable 4 EN GND 5 VOUT = Space-saving thermally enhanced MSOP package 1.225V(1 + R1/R2)
2
1µF
00 1- 11
APPLICATIONS
06 Figure 2. ADP1720 with Adjustable Output Voltage, 1.225 V to 5.0 V
DC-to-DC post regulation PCMCIA regulation Keep-alive power in portable equipment Industrial applications GENERAL DESCRIPTION
The ADP1720 is a high voltage, micropower, low dropout linear The ADP1720 is optimized for stable operation with small 1 μF regulator. Operating over a very wide input voltage range of 4 V ceramic output capacitors, allowing for good transient perform- to 28 V, the ADP1720 can provide up to 50 mA of output current. ance while occupying minimal board space. With just 28 μA of quiescent supply current and a micropower The ADP1720 operates from –40°C to +125°C and uses current shutdown mode, this device is ideal for applications that require limit protection and thermal overload protection circuits to low quiescent current. prevent damage to the device in adverse conditions. The ADP1720 is available in fixed output voltages of 3.3 V and Available in a small thermally enhanced MSOP package, the 5.0 V. An adjustable version is also available, which allows the ADP1720 provides a compact solution with low thermal resistance. output to be set anywhere between 1.225 V and 5.0 V. An enable function that allows external circuits to turn on and turn off the ADP1720 output is available. For automatic startup, the enable (EN) pin can be connected directly to the input rail.
Rev. A 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Tel: 781.329.4700 www.analog.com Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 ©2007 Analog Devices, Inc. All rights reserved.
Document Outline FEATURES APPLICATIONS TYPICAL APPLICATION CIRCUITS GENERAL DESCRIPTION REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION ADJUSTABLE OUTPUT VOLTAGE(ADP1720 ADJUSTABLE) APPLICATIONS INFORMATION CAPACITOR SELECTION Output Capacitor Input Bypass Capacitor Input and Output Capacitor Properties CURRENT LIMIT AND THERMAL OVERLOAD PROTECTION THERMAL CONSIDERATIONS PRINTED CIRCUIT BOARD LAYOUT CONSIDERATIONS OUTLINE DIMENSIONS ORDERING GUIDE