50mA High-Voltage Micro-power LDO in MSOP PRELIMINARY TECHNICAL DATA ADP1720 GENERAL DESCRIPTION FEATURES Wide Input Voltage Range: 4V to 28V Low Quiescent Current: 25µA ±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 1µF Ceramic Capacitors Short Circuit Protection Thermal Overload Protection Spacing-saving Thermally Enhanced MSOP package APPLICATIONS 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 25µA 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 1µF 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 -40°C to 125°C ambient temperature range. 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 © 2006 Analog Devices, Inc. All rights reserved. Fax: 781.461.3113 Rev. PrA | Page 1 of 9 PRELIMINARY TECHNICAL DATA ADP1720 ADP1720 TARGET SPECIFICATIONS Table 1. Electrical Characteristics VIN=12V, TA = 25°C, BOLD values indicate spec applies over TJ=-40°C to 125°C, unless otherwise noted. Parameter Input Voltage GND Pin Current 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 Conditions Min 4 IOUT = 0mA IOUT = 1mA IOUT = 10mA IOUT = 50mA IOUT=100µA 4V ≤VIN≤ 28V, IOUT = 100µA to 50mA 4V ≤VIN≤ 28V, IOUT = 100µA to 50mA IOUT=100µA VADJ=VOUT, 4V ≤ VIN ≤ 28V IOUT = 100µA to 50mA VADJ=VOUT, 4V ≤ VIN ≤ 28V IOUT = 100µA 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 65 60 TJ rising, Hysteresis = 15°C EN = GND 4V ≤ VIN ≤ 28V 4V ≤ VIN ≤ 28V EN = IN or GND Typ Max 28 50 180 700 3300 +1 +2 +3 1.212 1.224 1.136 30 ±0.15 0.01 75 100 200 300 85 150 100 3 5 0 0.4 +1 190 350 550 120 1 nA %/V %/V dB mV mA °C 1.5 -1 Unit V µA µA µA µA % % % µA V V µA 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 ADP1720 ABSOLUTE MAXIMUM RATINGS Table 3. Absolute Maximum Ratings (at 25°C, unless othe rwise noted) 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 –65°C to +150°C –40°C to +125°C 150°C 300°C Table 2. Thermal Resistance Package Type 8-lead MSOP 2 θJA1 TBD θJC 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 θJA is specified for the worst-case conditions, i.e., θJA 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 2 PIN NAME ADP1720-XX ADP1720-ADJ IN IN 5,6,7,8 4 GND EN GND EN 1 GND ADJ 3 OUT OUT DESCRIPTION Input. Connect IN to the input power source. Bypass IN to GND with a 1µF 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. Output. Bypass OUT to GND with a 1µF or greater capacitor. See Output Capacitor Selection. Rev. PrA | Page 4 of 9 PRELIMINARY TECHNICAL DATA ADP1720 TYPICAL PERFORMANCE CHARACTERISTICS 2.502 10.010 10.005 10.000 VOUT – V VOUT – V 2.501 9.995 2.500 2.499 9.990 2.498 –40 –25 9.985 –40 0 25 o TEMPERATURE – C 85 125 35 20 65 50 o TEMPERATURE – C 80 95 110 125 Figure 3. Output Voltage vs. Temperature 5.008 0.8 5.004 0.7 SUPPLY CURRENT – mA VOUT – V Figure 1. Output Voltage vs. Load Current 5 –10 5.000 4.996 o +125 C 0.6 o +25 C o –40 C 0.5 0.4 4.992 –40 0 25 o TEMPERATURE – C 85 125 12 16 20 24 28 32 INPUT VOLTAGE – V 36 Figure 4.Ground Current vs. Load Current Figure 2.Ground Current vs. Input Voltage Rev. PrA | Page 5 of 9 40 PRELIMINARY TECHNICAL DATA ADP1720 0.8 40 IL = 0 TO 10mA LOAD REGULATION – ppm/mA INPUT CURRENT – mA 30 o +125 C 0.7 o +25 C 0.6 –40oC 0.5 VIN = 40V 20 10 0 VIN = 14V –10 –20 –30 0.4 8 12 16 20 24 28 32 36 –40 –40 40 0 50 25 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 50 0.85 IL = 0 TO 5mA 40 LOAD REGULATION – ppm/mA SUPPLY CURRENT – mA 0.80 0.75 0.70 +125oC 0.65 o +25 C 0.60 0.55 o –40 C 0.50 30 VIN = 40V 20 10 0 VIN = 8V –10 0.45 –20 0.40 5 10 15 20 30 25 INPUT VOLTAGE – V 35 –40 40 0 25 85 TEMPERATURE – oC Figure 8.Load Transient Response Figure 6. PSRR vs. Frequency Rev. PrA | Page 6 of 9 125 PRELIMINARY TECHNICAL DATA ADP1720 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 25µA 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 1µF 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 -40°C to 125°C ambient temperature range. Adjustable Output Voltage 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 150°C. The thermal protection circuitry has a typical hysteresis of 15°C. 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. 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 12kΩ for RBOTTOM. Shutdown The ADP1720 enters a low power shutdown state by driving EN to GND. In shutdown, the ADP1720 consumes less than 5µA. For automatic startup connect EN to IN. Note that EN withstands up to the +28V input voltage without damage. Package and Power Dissipation Output Capacitor Selection The ADP1720 is optimized for operation with small 1µF ceramic capacitors. The ADP1720 maintains stability with capacitance greater than 1µF, 10uF maximum and over a wide range of capacitor ESR values ( At least 1mΩ to 100mΩ). The ADP1720 use a thermally-enhanced MSOP package, which achieves a respectable TBD°C/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 Part Number Output Voltage ADP1720-33 3.3V ADP1720-50 5.0V ADP1720-ADJ 1.2V – 5.0V Package Description 8-lead MSOP 8-lead MSOP 8-lead MSOP Package Option Top Mark No. of Parts per Reel Temperature Range (°C) TBD TBD TBD -40°C to +125°C TBD TBD TBD -40°C to +125°C TBD TBD TBD -40°C to +125°C Rev. PrA | Page 9 of 9 PR06111-0-4/06(PrA) Table 3.