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| NIKO-SEM 0.8A Fixed and Adjustable Low Dropout Linear Regulator (LDO) FEATURES L1087 Series SOT-89,TO-92 GENERAL DESCRIPTION The L1087 Series are positive and low dropout three-terminal voltage regulators with 0.8A output current capability. These devices are designed for use in low voltage applications that offers lower dropout voltage and faster transient response. These devices are fully protected against over current faults, over temperature operation, reversed input polarity, reversed lead insertion, transient voltage spike ...etc. On-Chips trimming the reference voltage to 1% and features the low dropout of maximum 1.45 volts. The L1087 Series regulators offer fixed and adjustable voltage options available in the space saving SOT-89 & TO-92 package. Fixed 3.3V or adjustable output voltage Low dropout voltage Low ground current Fast transient response Current & thermal limiting Line regulation: 0.5% typical Load regulation: 0.5% typical Available in SOT-89 & TO-92 package APPLICATIONS Low voltage micro-controllers Battery Chargers 5V to 3.3V linear regulators Motherboard clock supplies Post regulator for switching supplies TYPICAL APPLICATION Vin IN L1087 OUT ADJ Vref Vout Vin > 4.75V IN L1087-3.3 OUT Vout = 3.3V R1 + Cin 10uF + Cout 10uF Cin 10uF GND + Cout 10uF + RL Iadj R2 Vo = Vref (1+R2/R1) + Iadj x R2 1. Cin needed if device is far from filter capacitors. 2. Cout required for stability. 1. Cin needed if device is far from filter capacitors. 2. Cout required for stability. - Basic Adjustable Regulator Circuit - - Fixed Voltage Regulator - 1 AUG-30-2001 NIKO-SEM 0.8A Fixed and Adjustable Low Dropout Linear Regulator (LDO) L1087 Series SOT-89,TO-92 ABSOLUTE MAXIMUM RATINGS Maximum Supply Voltage Power Dissipation Thermal Resistance Junction to Case, JC Thermal Resistance Junction to Ambient, JA 15V* Internally Limited 18 C/W 160 C/W Operating Junction Temperature Range Storage Temperature Range Lead Temperature (Soldering, 10 Seconds) 0 to 125 C -40 to 150 C 260 C * When considering short circuits to ground, the maximum input-to-output differential voltage shall not be allowed greater than approximate 2~3V at values of supply voltage in excess of 10V, continuous short-circuits can exceed the power dissipation ratings and cause eventual destruction. ELECTRICAL CHARACTERISTICS (Unless otherwise specified, TA = 25 C) Parameter Symbol Test Conditions Typical 1.25V VO 1.2V 0.5% 0.5% 10mA 55A 1.2A 0.003% of VOUT 72dB 100A 0.9A (Min) Limits 1.23VMin 1.27VMax 0.98VO(Min) 1.02VO(Max) 1.45V 2% 2.5% Reference Voltage (Adjustable version) VREF VIN = 5V, IOUT = 10mA Output Voltage VIN = 5V, IOUT = 10mA VO (Fixed version) Dropout Voltage VD VREF = 1%, IOUT = 0.8A Line Regulation REG(LINE) (VOUT + 1.5V) VIN 15V, IOUT = 10mA Load Regulation REG(LOAD) (VIN -VOUT) = 2V, 10mA IOUT 0.8A Minimum Load Current IO IADJ ICL VN RA 1.5V (VIN -VOUT) 5.75V VIN - VOUT = 2V Adjust Pin Current Current Limit RMS Output Noise Ripple Rejection Ratio f = 120Hz, CADJ = 22F for ADJ pin, VIN = 5V, IOUT = 0.8A 60dB (Min) 2 AUG-30-2001 NIKO-SEM 0.8A Fixed and Adjustable Low Dropout Linear Regulator (LDO) L1087 Series SOT-89,TO-92 ELECTRICAL CHARACTERISTICS FOR FIXED 3.3V(Unless otherwise specified, TA = 25 C) Parameter Output Voltage (Fixed version) Dropout Voltage Line Regulation Load Regulation Minimum Load Current Symbol VO Test Conditions VIN = 5V, IOUT = 10mA Typical VO 1.2V 0.5% 0.5% 10mA 55A 1.2A 0.003% of VOUT 72dB Limits 3.234V(Min) 3.367V(Max) 1.45V 2.0% 2.0% VD VO = 1%, IOUT = 0.8A REG(LINE) (VOUT + 1.5V) VIN 15V, IOUT = 10mA REG(LOAD) (VIN -VOUT) = 2V, 10mA IOUT 0.8A IO IGND ICL VN RA f = 120Hz, Co=22Uf,VIN = 5V, IOUT = 0.8A 1.5V (VIN -VOUT) 5.75V VIN - VOUT = 2V GND Pin Current Current Limit RMS Output Noise Ripple Rejection Ratio 100A 0.9A (Min) 60dB (Min) DEVICE SELECTION GUIDE Device Voltage Version Package Marking L1087C Adjustable SOT-89 L1087 L1087C-3.3 3.3V SOT-89 87-3.3 L1087N-3.3 3.3V TO-92 87N-3.3 3 AUG-30-2001 NIKO-SEM 0.8A Fixed and Adjustable Low Dropout Linear Regulator (LDO) L1087 Series SOT-89,TO-92 PIN CONFIGURATIONS Pin # 1 2 3 Function Adjust/Ground Output Input Note: TAB is Output Pin Pin # 1 2 3 Function Output Adjust/Ground Input 4 AUG-30-2001 NIKO-SEM 0.8A Fixed and Adjustable Low Dropout Linear Regulator (LDO) L1087 Series SOT-89,TO-92 SOT-89 MECHANICAL DATA mm Dimension A B C D E F G Min. 4.3 1.6 0.4 2.4 0.8 0.4 0.4 Typ. 4.5 1.7 0.5 2.5 1.2 0.45 0.5 Max. 4.7 1.8 0.6 2.6 1.4 0.5 0.6 Dimension H I J K L M N Min. 1.4 2.8 1.3 3.8 0.3 mm Typ. 1.5 3.0 1.5 4.2 0.4 Max. 1.6 3.2 1.7 4.6 0.5 5 AUG-30-2001 NIKO-SEM 0.8A Fixed and Adjustable Low Dropout Linear Regulator (LDO) L1087 Series SOT-89,TO-92 TO-92 MECHANICAL DATA mm Dimension A B C D E F G Min. 4.445 4.318 12.7 0.356 1.143 3.175 0.762 1.27 Typ. Max. 5.207 5.334 15.5 0.533 1.397 4.191 1.270 Dimension H I J K L M N Min. 2.413 0.356 mm Typ. 2.540 Max. 2.667 0.533 6 AUG-30-2001 |
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