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| AS2931 100mA Low Dropout Voltage Regulator FEATURES * * * * * * * * 5.0V, 4.5V, 4.0V, 3.5V, 3.3V, and 3.0V Versions are Available Output Current in Excess of 100 mA Input-Output Differential is Less Than 0.6V Mirror-Image Insertion Protection Internal Thermal Overload Protection Available in TO-220, TO-92, SOT-89, and SO-8 Package Types Available as Adjustable with TTL Compatible Switch Similar Improved to Industry Standard LM2931 * * * * * * * Reverse Battery Protection Short Circuit Protection 60V Load Dump Protection -20V Reverse Transient Protection Portable Instrumentation Radio Control Systems Cordless Telephones APPLICATION PRODUCT DESCRIPTION The AS2931 is a low power voltage regulator. This device is an excellent choice for use in battery-powered applications such as cordless telephones, radio control systems, and portable computers. The AS2931 features offers very low quiescent currents (0.4 mA.), and very low drop output voltage (typ. 50 mV at light load and 300 mV at 100 mA). Other features include the logiccompatible On/Off input which enables the regulator to be switched on and off. The AS2931 is offered in a 3-pin TO-92/TO-220 package compatible with other 5V regulators and SOT-89/SO-8 package. The regulator output voltage may be internally pin-strapped for a 3.5V, 3.3V, 3.0V, or programmed from 3V to 24V with an external pair of resistors. ORDERING INFORMATION TO-92 3-PIN AS2931AN-X AS2931N-X SO-8 AS2931AS-X AS2931S-X AS2931CS-X SOT-89 3-PIN AS2931AM1-X AS2931M1-X TO-220 3/5 PIN AS2931AU-X AS2931U-X AS2931CU-X OPER. TEMP. RANGE -40C to +85C -40C to +85C -40C to +85C PIN CONNECTIONS 8-Pin Surface Mount (S) Fixed Output VOUT GND GND BYP 1 2 8 7 VIN GND GND ON/OFF X = Output Voltages (X = 3.0V, 3.3V, 3.5V) or blank for Adj.) TO-220-3 (U) Fixed TO-92 (N) 1 2 3 AS2931 1 2 3 VOUT AS2931 3 4 6 5 SOT-89 (M1) Top View 8-Pin Surface Mount (S) Adj Output VOUT GND 1 2 8 7 VIN GND GND ON/OFF AS2931 1 2 3 1. VIN 2. GND 3. VOUT VOUT GND VIN VIN GND Bottom View Top View AS2931 GND ADJ 3 4 6 5 Front View Top View Rev. 10/11/00 AS2931 ABSOLUTE MAXIMUM RATINGS Power Dissipation........................................... Internally limited Lead Temp. (soldering, 5 Seconds) ................................. 260C Storage Temperature Range ........................... -65C to +150C Operating Junction Temperature Range ........... -40C to +85C Input Supply Voltage............................................. -0.3 to +26V ESD Rating.........................................................................2KV ELECTRICAL CHARACTERISTICS at VS = 14V, TA = 25C, IO = 10 mA, C2 = 100 F, unless otherwise specified. ( Note 1) Parameter 3.0 Volt Version Output Voltage 6V 3.00 3.12 2.88 AS2931A-3.3 3.23 3.20 3.30 3.36 3.00 3.15 AS2931-3.3 3.30 3.30 AS2931-5 5.00 3.39 3.43 5.25 5.5 3.30 3.39 AS2931A-5 5.00 5.19 5.25 Quiescent Current Maximum Operational Input Voltage Maximum Line Transient Reverse Polarity Input Voltage, DC Reverse Polarity Input Voltage, Transient Output Noise Voltage Ripple Rejection Note 1: See TYPICAL APPLICATIONS notes to ensure constant junction temperature, low duty cycle pulse testing used. Note 2: All limits are at 25C or over the full operating temperature junction range of -40C to +85C. Note 3: The maximum power dissipation is a function of maximum junction temperature, total thermal resistance, and ambient temperature. Note 4: Human body model, 100 F discharged through 1.5 K. Rev. 10/11/00 AS2931 Application Hints The AS2931 requires an output capacitor for device stability. The value required varies greatly depending upon the application circuit and other factors. The high frequency characteristics of electrolytic capacitors depend greatly on the type and also on the manufacturer. Sometimes only bench testing is the only means to determine the proper capacitor type and value. The high quality 100 F aluminum electrolytic covers all general application circuits, this stability can be obtained with a tantalum electrolytic value of 47 F. Another critical point of electrolytic characteristics is its performance over temperature. The AS2931 is designed to operate starting at -40C which may not be true in the case of electrolytic. Higher temperatures generally no problem. The electrolytic. type in aluminum will freeze around -30C. This could cause an oscillation at output of regulator. At a lower temperature requirement by many applications the capacitor should maintain its performance. So as a result, for an application which regulator junction temperature does not exceed 25C, the output capacitor can be reduced by the factor of two over the value needed for the entire temperature range. Other points with linear regulators is that the twitch higher output current stability decreases. In most applications the AS2931 is operating at few milliamps. In these applications the output capacitance can be further reduced. For example, when the regulator is running at 10mA output current the output capacitance value is half compared to the same regulator that is running at 100 mA. With the AS2931 adjustable regulator, the minimum value of output capacitance is a function of the output voltage. The value decreases with higher output voltages, since the internal loop gain is reduced. The worst case occurs at the lower temperature and maximum operating currents, the entire circuit and the electrolytic, should be cooled down to the minimum temperature. The minimum of 0.6 volts required at the input of regulator above the output to keep the power dissipation and die heating to its minimum. After the value for the capacitor has been determined for actual use, the value should be doubled. Rev. 10/11/00 AS2931 TYPICAL CHARACTERISTICS QUIESCENT CURRENT QUIESCENT CURRENT REFERENCE VOLTAGE 25 QUIESCENT CURRENT (mA) QUIESCENT CURRENT (mA) 30 25 20 15 10 5 0 -40 0 40 80 120 0 VIN = 14V REFERENCE VOLTAGE (V) 1.30 1.28 1.26 1.24 1.22 1.20 1.18 1.16 1.14 1.12 1.10 LM2931CT ADJUSTABLE 20 15 10 3 2 1 0 JUNCTION TEMPERATURE (C) IO = 0mA ~ ~ IO = 50mA ~ ~ 30 60 90 0 3 6 9 12 15 18 21 24 OUTPUT CURRENT (mA) OUTPUT VOLTAGE (V) PEAK OUTPUT CURRENT DROPOUT VOLTAGE INPUT OUTPUT DIFFERENTIAL (V) INPUT OUTPUT DIFFERENTIAL (V) DROPOUT VOLTAGE 0.6 0.5 0.4 0.3 0.2 0.1 0 0 40 80 120 JUNCTION TEMPERATURE (C) LOW VOLTAGE BEHAVIOR IO = 50mA IO = 10mA IO = 100mA 0.6 OUTPUT CURRENT (mA) 800 500 400 300 200 100 0 0 50 OUTPUT CURRENT (mA) MAXIMUM POWER DISSIPATION (TO-220) 0.5 0.4 0.3 0.2 0.1 0 100 TJ = 25C TJ = 85C TJ = -40C 0 10 20 30 INPUT VOLTAGE (V) MAXIMUM POWER DISSIPATION (TO-92) 6.0 5.0 4.0 POWER DISSIPATION (W) OUTPUT VOLTAGE (V) 18 16 14 12 10 8 6 4 2 0 NO HEAT SINK 10 C/W HEAT SINK POWER DISSIPATION (W) LM2931 5.0 IO = 100 mA 22 20 INFINITE HEAT SINK 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0.125" LEAD LENGTH FROM PC BOARD 3.0 2.0 0.4" LENGTH FROMPC BOARD 1.0 2.0 3.0 4.0 5.0 6.0 0 10 20 30 40 50 60 70 80 90 100 AMBIENT TEMPERATURE (C) 0 10 20 30 40 50 60 70 80 90 INPUT VOLTAGE (V) AMBIENT TEMPERATURE (C) 1.0 0.9 POWER DISSIPATION (W) MAXIMUM POWER DISSIPATION (SO8) MAXIMUM POWER DISSIPATION OPERATION DURING LOAD DUMP 10 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 0 5 10 15 20 25 30 AMBIENT TEMPERATURE (C) OUTPUT IMPEDANCE ( ) 0.8 1 OUTPUT VOLTAGE (V) LM29315.0 IO = 10mA 70 60 50 40 30 20 10 0~ ~ 6 4 2 0 -2 -100 0.1 0.01 0 30 60 90 120 150 FREQUENCY (Hz) OUTPUT VOLTAGE (V) CO = 100F RL = 500W ~ ~ 0 100 200 300 400 500 TIME (ms) Rev. 10/11/00 AS2931 TYPICAL APPLICATIONS AS2931 Fixed Output AS2931 SCHEMATIC DIAGRAM Rev. 10/11/00 |
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