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| 50mA High-Voltage Micro-power LDO in MSOP PRELIMINARY TECHNICAL DATA FEATURES Wide Input Voltage Range: 4V to 28V Low Quiescent Current: 25A 1% Initial Accuracy Very Low Dropout Voltage: 300 mV @ 50mA Fixed 3.3V and 5V Voltage Options Adjustable Output from 1.2V to 5.0V Optimized for Small 1F Ceramic Capacitors Short Circuit Protection Thermal Overload Protection Spacing-saving Thermally Enhanced MSOP package ADP1720 GENERAL DESCRIPTION The ADP1720 is a high-voltage, micro-power, low dropout linear regulator. Designed for robust operation, the ADP1720 includes current limiting and short-circuit protection, and thermal overload protection . With just 25A of quiescent supply current and a micro-power shutdown mode, this device is ideal for applications that require low quiescent current. The small thermally-enhanced MSOP package and 1F ceramic output capacitor provides a compact solution with low thermal resistance for high power dissipation. The ADP1720 is available in fixed output voltages of 3.3V and 5V, or its output voltage can be adjusted over a range of 1.2V to 5V. The ADP1720 operates over the -40C to 125C ambient temperature range. APPLICATIONS Industrial Applications Battery-Power Regulators TYPICAL APPLICATION CIRCUIT Figure 1. ADP1720 typical operation circuit for fixed output voltage options. Figure 2. ADP1720 typical operation circuit for variable output voltage options. Rev. PrA 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. Specifications subject to change without notice. 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 owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com (c) 2006 Analog Devices, Inc. All rights reserved. Fax: 781.461.3113 Rev. PrA | Page 1 of 9 PRELIMINARY TECHNICAL DATA ADP1720 TARGET SPECIFICATIONS Table 1. Electrical Characteristics ADP1720 C, C C, VIN=12V, TA = 25 BOLD values indicate spec applies over TJ=-40 to 125 unless otherwise noted. Parameter Input Voltage GND Pin Current Conditions Min 4 Typ Max 28 50 180 700 3300 +1 +2 +3 1.212 1.224 Unit V A A A A % % % Output Voltage Accuracy ADJ Pin Voltage ADJ Inupt Bias Current Line Regulation Load Regulation Ripple Rejection Dropout Voltage1 Current Limit Threshold Thermal Shutdown Temperature Shutdown Supply Current EN Input Logic High EN Input Logic Low EN Input Leakage Current IOUT = 0mA IOUT = 1mA IOUT = 10mA IOUT = 50mA IOUT=100A 4V VIN 28V, IOUT = 100A to 50mA 4V VIN 28V, IOUT = 100A to 50mA IOUT=100A VADJ=VOUT, 4V VIN 28V IOUT = 100A to 50mA VADJ=VOUT, 4V VIN 28V IOUT = 100A to 50mA VADJ=VOUT VIN = 4V to 28V, IOUT = 1mA 1mA < IOUT < 50mA F=120Hz, ILOAD=50mA IOUT = 1mA, VIN = 4V IOUT = 10mA, VIN = 4V IOUT = 50mA, VIN = 4V VOUT = 90% of nominal setpoint 25 100 400 1800 -1 -2 -3 1.188 1.176 1.2 1.164 1.136 65 60 TJ rising, Hysteresis = 15C 30 0.15 0.01 75 100 200 300 85 150 100 190 350 550 120 nA %/V %/V dB mV mA C EN = GND 4V VIN 28V 4V VIN 28V EN = IN or GND 3 5 1.5 -1 0 0.4 +1 A V V A 1 Dropout voltage is defined as the input to output voltage differential when the input voltage is set to the nominal output voltage. Also Dropout voltage does not apply to fixed output voltage options below 4V. 2 All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC). Typical values are at TA = 25 C. Specifications subject to change without notice. 3 Current limit threshold is defined as the current at which the output voltage drops to 90% of the specified typical value. For example, for a 1.0V output voltage, the current limit is defined as the current that causes the output voltage to drop to 90% of 1V, or 0.9V. Rev. PrA | Page 2 of 9 PRELIMINARY TECHNICAL DATA ABSOLUTE MAXIMUM RATINGS Table 3. Absolute Maximum Ratings (at 25 unless othe rwise noted) C, Parameter IN, EN to GND IN to OUT VOUT, ADJ to GND Storage Temperature Range Operating Temperature Range Operating Junction Temperature Lead Temperature Range (Soldering, 10sec) Rating -0.3V to +30V -0.3V to +30V -0.3V to +7V -65C to +150 C -40C to +125 C 150C 300C ADP1720 Table 2. Thermal Resistance Package Type 8-lead MSOP 2 1 JA TBD JC TBD Unit C/W ESD CAUTION ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection. Although these products feature proprietary ESD protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. 1 2 JA is specified for the worst-case conditions, i.e., JA is specified for device soldered in circuit board for surface mount packages. This is a thermally-enhanced MSOP. Rev. PrA | Page 3 of 9 PRELIMINARY TECHNICAL DATA ADP1720 PIN CONFIGURATION PIN DESCRIPTIONS (Pin number are preliminary and subject to change) PIN PIN NAME ADP1720-XX ADP1720-ADJ IN IN DESCRIPTION 2 5,6,7,8 4 GND EN GND EN 1 GND ADJ Input. Connect IN to the input power source. Bypass IN to GND with a 1F or greater capacitor. Ground. Enable control input. EN turns on/off the ADP1720. Drive EN high to turn on the regulator, drive it low to turn it off. Connect EN to IN for automatic startup. In fixed output voltage option of ADP1720, connect this pin to Ground. In variable output voltage option of ADP1720, this is the Output Voltage Adjust Pin. To set the adjustable output voltage connect a resistive voltage divider from OUT to ADJ. 3 OUT OUT Output. Bypass OUT to GND with a 1F or greater capacitor. See Output Capacitor Selection. Rev. PrA | Page 4 of 9 PRELIMINARY TECHNICAL DATA TYPICAL PERFORMANCE CHARACTERISTICS 10.010 ADP1720 2.502 10.005 2.501 VOUT - V VOUT - V -40 0 25 o TEMPERATURE - C 85 125 10.000 2.500 9.995 2.499 9.990 9.985 2.498 -40 -25 -10 5 35 20 65 50 o TEMPERATURE - C 80 95 110 125 Figure 1. Output Voltage vs. Load Current Figure 3. Output Voltage vs. Temperature 5.008 0.8 SUPPLY CURRENT - mA 5.004 0.7 +125 C o VOUT - V 5.000 0.6 +25 C o o -40 C 0.5 4.996 4.992 -40 0 25 o TEMPERATURE - C 85 125 0.4 12 16 20 24 28 32 INPUT VOLTAGE - V 36 40 Figure 2.Ground Current vs. Input Voltage Figure 4.Ground Current vs. Load Current Rev. PrA | Page 5 of 9 PRELIMINARY TECHNICAL DATA 0.8 ADP1720 40 IL = 0 TO 10mA 30 0.7 +125 C o LOAD REGULATION - ppm/mA VIN = 40V 20 INPUT CURRENT - mA 10 0 +25 C 0.6 -40oC o VIN = 14V -10 -20 -30 0.5 0.4 8 12 16 20 24 28 32 36 40 -40 -40 0 25 50 85 125 INPUT VOLTAGE - V TEMPERATURE - oC Figure 5. Shutdown and Ground Current vs. Temperature Figure 7. Dropout Voltage vs. Load Current, VOUT=3.3V and 2.5V 0.85 0.80 0.75 0.70 50 IL = 0 TO 5mA 40 LOAD REGULATION - ppm/mA SUPPLY CURRENT - mA 30 VIN = 40V 20 +125oC 0.65 +25 C 0.60 0.55 o 10 0 -40 C 0.50 0.45 0.40 5 o VIN = 8V -10 -20 10 15 30 25 INPUT VOLTAGE - V 20 35 40 -40 0 25 TEMPERATURE - oC 85 125 Figure 6. PSRR vs. Frequency Figure 8.Load Transient Response Rev. PrA | Page 6 of 9 PRELIMINARY TECHNICAL DATA THEORY OF OPERATION Introduction The ADP1720 is a high-voltage, micro-power, low dropout linear regulator. Designed for robust operation, the ADP1720 includes current limiting and short-circuit protection, thermal overload protection. With just 25A of quiescent supply current and a micro-power shutdown mode, this device is ideal for applications that require low quiescent current. The small thermally-enhanced MSOP package and 1F ceramic output capacitor provides a compact solution with low thermal resistance for high power dissipation. The ADP1720 is available in fixed output voltages of 3.3V and 5V, or its output voltage is adjustable over a range of 1.2V to 5V. The ADP1720 operates over the -40C to 125C ambient temperature range. ADP1720 Ceramic capacitors are manufactured with a variety of dielectrics, each with different behavior over temperature and applied voltage. When choosing your capacitor be sure to choose a dielectric adequate to ensure the minimum capacitance over the necessary temperature range. Thermal Protection The ADP1720 has an internal thermal shutdown function that protects itself from thermal overloads. The thermal protection circuitry activates and disables the output when the die temperature exceeds 150C. The thermal protection circuitry has a typical hysteresis of 15C. Once the die temperature decreases beyond the hysteresis, the output is enabled again. Current Limit The ADP1720 uses internal current limiting to protect itself and its load during overload and short-circuit conditions. Adjustable Output Voltage The ADP1720 output voltage is adjustable over a 1.2V to 5.0 range. The output voltage is set by connecting a resistive voltage divider from OUT to ADJ. The output voltage is calculated using the equation VOUT=1.2V(1+RTOP/RBOTTOM) where RTOP is the resistor from OUT to ADJ and RBOTTOM is the resistor from ADJ to GND. The maximum bias current into ADJ is 100nA, so for less than 0.1% error due to the bias current, use values less than 12k for RBOTTOM. Shutdown The ADP1720 enters a low power shutdown state by driving EN to GND. In shutdown, the ADP1720 consumes less than 5A. For automatic startup connect EN to IN. Note that EN withstands up to the +28V input voltage without damage. Output Capacitor Selection The ADP1720 is optimized for operation with small 1F ceramic capacitors. The ADP1720 maintains stability with capacitance greater than 1F, 10uF maximum and over a wide range of capacitor ESR values ( At least 1m to 100m ). Package and Power Dissipation The ADP1720 use a thermally-enhanced MSOP package, which achieves a respectable TBDC/W for such a small footprint. Rev. PrA | Page 7 of 9 PRELIMINARY TECHNICAL DATA ADP1720 OUTLINE DIMENSIONS Rev. PrA | Page 8 of 9 PRELIMINARY TECHNICAL DATA ADP1720 ORDERING GUIDE Table 3. Part Number Output Voltage Package Description Package Option Top Mark No. of Parts per Reel Temperature Range ( C) PR06111-0-4/06(PrA) ADP1720-33 3.3V ADP1720-50 5.0V ADP1720-ADJ 1.2V - 5.0V 8-lead MSOP 8-lead MSOP 8-lead MSOP TBD TBD TBD -40C to +125C TBD TBD TBD -40C to +125C TBD TBD TBD -40C to +125C Rev. PrA | Page 9 of 9 |
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