AS1371
Part | Datasheet |
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AS1371-BTDT-30 (pdf) |
Related Parts | Information |
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AS1371-BTDT-12 |
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AS1371-BTDT-18 |
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AS1371-BTDT-25 |
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AS1371-SAMPLE |
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AS1371-BTDT-105 |
PDF Datasheet Preview |
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Datasheet AS1371 400mA, Low Input Voltage, Low Quiescent Current LDO 1 General Description The AS1371 low input voltage, positive voltage regulator is designed to deliver up to 400mA while consuming typically only 15µA of quiescent current. The device operates from input voltages of 1.2V to 3.6V, and is available in fixed output voltages between 0.6V and 3.3V programmable in 50mV steps . Operation at the full 400mA load current is dependent upon the maximum power dissipation available from package and environment. The low input voltage and ultra-low dropout voltage 20mV 100mA load and 80mV 400mA load supports single primary cell operation in small applications, when operated with minimum inputto-output voltage differentials. In addition, the regulator provides a power management life extension by operating from pre-existing 1.8V and 2.5V outputs to provide low output voltages for new generation portable processor cores. The device features stable output voltage with ceramic capacitors down to a value of 1µF, strict output voltage regulation tolerances ±1% , and good line- and load-regulation. The AS1371 is available in a 6-pin 2x2 TDFN package and is qualified for -40°C to +85°C operation. Figure AS1371 - Typical Application Diagram 2 Key Features Dropout Voltage 20mV 100mA load Input Voltage Range 1.2V to 3.6V Voltages 0.6V to 3.3V in 50mV steps Output Current 400mA Voltage Accuracy ±1% Shutdown Current 10nA Quiescent Current 50µA max load Overtemperature/Overcurrent Protection Lockout Feature Enable Input and Low Battery Detection Input Option External Components Required Temperature Range -40°C to +85°C 2x2 TDFN Package 3 Applications The devices are ideal for powering cordless and mobile phones, MP3 players, CD and DVD players, PDAs, hand-held computers, digital cameras, and any other hand-held and/or battery-powered device. Input 1.2V to 3.6V CIN 1µF ON OFF AS1371 Output 0.6V to 3.3V COUT 1µF SENSE 1 - 17 AS1371 Datasheet - Pin Assignments 4 Pin Assignments Figure Pin Assignments Top View IN 1 POK 2 6 OUT AS1371 5 SENSE Exposed Pad 4 GND Pin Descriptions Table Pin Descriptions Pin Number 1 Pin Name IN 3 4 5 6 Exposed Pad EN GND SENSE OUT GND LDO Input. Input voltage range 1.2V to 3.6V. Bypass with 1µF to GND. Power-OK Output. Active-low, open-drain output indicates an out-of-regulation condition. Connect a pull-up resistor to pin OUT for logic levels. Leave this pin unconnected if the Power-OK feature is not used. Active-High Enable Input. A logic low reduces the supply current to < 1µA. Connect to pin IN for normal operation. Ground. This pin also functions as a heat sink. Solder it to a large pad or to the circuit-board ground plane to maximize power dissipation. Sense Input. Represents the input for the Power-OK behavior. If connected to GND the POK output is related to OUT. LDO Output. Bypass with 1µF to GND. Exposed Pad. This pin also functions as a heat sink. Solder it to a large pad or to the circuitboard ground plane to maximize power dissipation. Internally it is connected GND. 2 - 17 AS1371 Datasheet - Absolute Maximum Ratings Available in 50mV steps, see Ordering Information on page 16 Output Voltage Accuracy TAMB = +25ºC, IOUT = 1mA, VOUT > 1V TAMB = -40 to +85ºC, IOUT = 1mA, VOUT > 1V IOUT Maximum Output Current ILIM Current Limit Quiescent Current IOUT = 0mA IOUT = 400mA 15 50 VIN-VOUT Dropout Voltage1 IOUT = 100mA IOUT = 400mA 20 80 Line Regulation IOUT = 1mA Load Regulation IOUT = 1mA to 400mA Output Voltage Noise f = 10Hz to 100kHz, IOUT = 10mA PSRR Output Voltage AC Power-Supply Rejection Ratio f = 10kHz, IOUT = 10mA COUT Output Capacitor Load Capacitor Range ESR Load Shutdown2 Exit Delay from Shutdown3,4 IOFF Enable Supply Current EN = GND, TAMB = +25ºC EN = GND, TAMB = +85ºC Enable Input Threshold Enable Input Bias Current EN = IN or GND, TAMB = +25ºC EN = IN or GND, TAMB = +85ºC Power-OK Output VPOK Power-OK Voltage Threshold5 SENSE = GND, VPOKFALLING SENSE = GND, Hysteresis VSENSE Power-OK Sense Voltage Threshold VOUT 1.05V, VSENSE falling Hysteresis The AS1371 is a low-dropout, low-quiescent-current linear regulator intended for LDO regulator applications where output current load requirements range from no load to 400mA. All devices come with fixed output voltage from 0.6V to 3.3V. See Ordering Information on page The AS1371 also features a Power-OK output to indicate when the output is within 10% max of final value when the Enable pin is grounded. When the Enable pin is raised above ground, the POK comparator inputs are switched to change the functionality. The comparator reference is now 800mV and the Enable pin becomes an uncommitted comparator input. See Power-OK and Low-Battery-Detect Functionality page 9 for setting resistor values when monitoring other voltages i.e. VOUT . Shutdown current for the whole regulator is typically 10nA. The device features integrated short-circuit and over current protection. Under-Voltage lockout prevents erratic operation when the input voltage is slowly decaying e.g. in a battery powered application . Thermal Protection shuts down the device when die temperature reaches 150°C. This is a useful protection when the device is under sustained short circuit conditions. Figure 13 shows the block diagram of the AS1371. It identifies the basics of a series linear regulator employing a P-Channel MOSFET as the control element. A stable voltage reference REF in Figure 13 is compared with an attenuated sample of the output voltage. Any difference between the two voltages reference and sample creates an output from the error amplifier that drives the series control element to reduce the difference to a minimum. The error amplifier incorporates additional buffering to drive the relatively large gate capacitance of the series pass Pchannel MOSFET, especially under transient conditions, when additional drive current is required. Input supply variations are absorbed by the series element, and output voltage variations with loading are absorbed by the low output impedance of the regulator. Figure AS1371 - Block Diagram QPOWER Thermal Overload Protection Shutdown Control Logic Error Amplifier AS1371 + VREF - TRIM 800mV + - + 94% - VREF 100mV + - OUT SENSE POK Output Voltages Standard products are factory-set with output voltages from 0.6V to 3.3V. A two-digit suffix of the part number identifies the nominal output see Ordering Information on page Non-standard devices are available. For more information contact: 8 - 17 AS1371 Datasheet - Detailed Description Power-OK and Low-Battery-Detect Functionality The AS1371’s power-ok or low-battery-detect circuitry is built around an N-channel MOSFET. The circuitry monitors the voltage on pin SENSE and if the voltage goes out of regulation e.g. during dropout, current limit or thermal shutdown the pin POK goes low. The pin SENSE can be connected to a resistive-divider to monitor a particular definable voltage and compare it with an internal voltage reference. If the SENSE pin is connected to GND an internal resistive-divider is activated and connected to the output. Therefore, the Power-OK functionality can be realized with no additional external components. The Power-OK feature is not active during shutdown and provides a power-on-reset function that can operate down to VIN = 1.2V. A capacitor to GND may be added to generate a power-on-reset delay. To obtain a logic-level output, connect a pull-up resistor from pin POK to pin OUT. Larger values for this resistor will help to minimize current consumption a resistor is perfect for most applications see Figure 1 on page For the circuit shown in the left of Figure 14 on page 9, the input bias current into SENSE is very low, permitting large-value resistor-divider networks while maintaining accuracy. Place the resistor-divider network as close to the device as possible. Use a defined resistor for R2 and then calculate R1 as: -----V----I--N------VSENSE Where: VSENSE = 800mV ± 150mV. In case of the SENSE pin is connected to GND, an internal resistor-divider network is activated and compares the output voltage with a 94% typ. voltage threshold. For this particular Power-OK application, no external resistive components are necessary. Figure Application Diagrams Input 1.2V to 3.6V CIN 1µF ON / OFF External Voltage Level Detection Input Monitoring AS1371 Output 0.6V to 3.3V COUT 1µF Internal Voltage Level Detection Output Monitoring Input 1.2V to 3.6V CIN 1µF ON / OFF AS1371 Output 0.6V to 3.3V COUT 1µF SENSE SENSE Current Limiting The AS1371 include current limiting circuitry to protect against short-circuit conditions. The circuitry monitors and controls the gate voltage of the P-channel MOSFET, limiting the output current to 400mA. The P-channel MOSFET output can be shorted to ground for an indefinite period of time without damaging the device. Thermal-Overload Protection The devices are protected against thermal runaway conditions by the integrated thermal sensor circuitry. Thermal shutdown is an effective instrument to prevent die overheating since the power transistor is the principle heat source in the device. If the junction temperature exceeds 150ºC with 15ºC hysteresis, the thermal sensor starts the shutdown logic, at which point the P-channel MOSFET is switched off. After the device temperature has dropped by approximately 15ºC, the thermal sensor will turn the P-channel MOSFET on again. Note that this will be exhibited as a pulsed output under continuous thermal-overload conditions. 9 - 17 AS1371 Datasheet - Application Information 9 Application Information Dropout Voltage Dropout is the input to output voltage difference, below which the linear regulator ceases to regulate. At this point, the output voltage change follows the input voltage change. Dropout voltage may be measured at different currents and, in particular at the regulator maximum one. From this is obtained the MOSFET maximum series resistance over temperature etc. More generally: VDROPOUT = ILOAD RSERIES Dropout is probably the most important specification when the regulator is used in a battery application. The dropout performance of the regulator defines the useful “end of life” of the battery before replacement or re-charge is required. Datasheet - Ordering Information 11 Ordering Information The device is available as the standard products listed in Table Table Ordering Information Ordering Code AS1371-BTDT-105 AS1371-BTDT-121 AS1371-BTDT-151 AS1371-BTDT-181 AS1371-BTDT-201 AS1371-BTDT-251 AS1371-BTDT-301 AS1371-SAMPLE1 Marking AO AM AN AT AP AQ AR AS Output 1.05V 1.2V 1.5V 1.8V 2.0V 2.5V 3.0V VOUT2 Description 400mA, Low Input Voltage, Low Quiescent Current LDO 400mA, Low Input Voltage, Low Quiescent Current LDO 400mA, Low Input Voltage, Low Quiescent Current LDO 400mA, Low Input Voltage, Low Quiescent Current LDO 400mA, Low Input Voltage, Low Quiescent Current LDO 400mA, Low Input Voltage, Low Quiescent Current LDO 400mA, Low Input Voltage, Low Quiescent Current LDO 400mA, Low Input Voltage, Low Quiescent Current LDO Available on request. Non-standard devices from 0.6V to 3.3V are available in 50mV steps. Delivery Form Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel Package 6-pin 2x2 TDFN 6-pin 2x2 TDFN 6-pin 2x2 TDFN 6-pin 2x2 TDFN 6-pin 2x2 TDFN 6-pin 2x2 TDFN 6-pin 2x2 TDFN 6-pin 2x2 TDFN Note: All products are RoHS compliant. Buy our products or get free samples online at ICdirect: Technical Support is available at For further information and requests, please contact us mailto or find your local distributor at 16 - 17 AS1371 Datasheet - Ordering Information Copyrights Copyright 1997-2012, austriamicrosystems AG, Tobelbaderstrasse 30, 8141 Unterpremstaetten, Austria-Europe. Trademarks Registered All rights reserved. The material herein may not be reproduced, adapted, merged, translated, stored, or used without the prior written consent of the copyright owner. All products and companies mentioned are trademarks or registered trademarks of their respective companies. Disclaimer Devices sold by austriamicrosystems AG are covered by the warranty and patent indemnification provisions appearing in its Term of Sale. austriamicrosystems AG makes no warranty, express, statutory, implied, or by description regarding the information set forth herein or regarding the freedom of the described devices from patent infringement. austriamicrosystems AG reserves the right to change specifications and prices at any time and without notice. Therefore, prior to designing this product into a system, it is necessary to check with austriamicrosystems AG for current information. This product is intended for use in normal commercial applications. Applications requiring extended temperature range, unusual environmental requirements, or high reliability applications, such as military, medical life-support or life-sustaining equipment are specifically not recommended without additional processing by austriamicrosystems AG for each application. For shipments of less than 100 parts the manufacturing flow might show deviations from the standard production flow, such as test flow or test location. The information furnished here by austriamicrosystems AG is believed to be correct and accurate. However, austriamicrosystems AG shall not be liable to recipient or any third party for any damages, including but not limited to personal injury, property damage, loss of profits, loss of use, interruption of business or indirect, special, incidental or consequential damages, of any kind, in connection with or arising out of the furnishing, performance or use of the technical data herein. No obligation or liability to recipient or any third party shall arise or flow out of austriamicrosystems AG rendering of technical or other services. Contact Information Headquarters austriamicrosystems AG Tobelbaderstrasse 30 A-8141 Unterpremstaetten, Austria Tel +43 0 3136 500 0 Fax +43 0 3136 525 01 For Sales Offices, Distributors and Representatives, please visit: 17 - 17 |
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