L1087C ETC
Document overview
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Technical content
SOT-89,TO-92 AUG-30-2001 0.8A Fixed and Adjustable Low Dropout Linear Regulator (LDO) NIKO-SEM 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 volt- age and faster transient response. These devices are fully protected against over current faults, over temperature oper- ation, reversed input polarity, reversed lead insertion, transient voltage spike …etc. On-Chips trimming the reference voltage to 1% and features the low dropout of maxi- mum 1.45 volts. The L1087 Series regulators offer fixed and adjustable voltage options available in the space saving SOT-89 & TO-92 package.
FEATURES
z Fixed 3.3V or adjustable output voltage z Low dropout voltage z Low ground current z Fast transient response z Current & thermal limiting z Line regulation: 0.5% typical z Load regulation: 0.5% typical z Available in SOT-89 & TO-92 package
APPLICATIONS
z Low voltage micro-controllers z Battery Chargers z 5V to 3.3V linear regulators zzzz Motherboard clock supplies z Post regulator for switching supplies TYPICAL APPLICATION - Basic Adjustable Regulator Circuit - - Fixed Voltage Regulator - OUT 2. Cout required for stability. +Cout 10uF Vin > 4.75V GND 1. Cin needed if device is far from filter capacitors. Vout = 3.3V +Cin 10uF RL L1087-3.3 ININ OUT Iadj ADJ Vref +Cin 10uF 1. Cin needed if device is far from filter capacitors. L1087 2. Cout required for stability. Vo = Vref (1+R2/R1) + Iadj x R2 VoutVin + Cout 10uF
SOT-89,TO-92 AUG-30-2001 0.8A Fixed and Adjustable Low Dropout Linear Regulator (LDO) NIKO-SEM ABSOLUTE MAXIMUM RATINGS z Maximum Supply Voltage 15V* z Operating Junction Temperature Range 0 to 125 °C z Power Dissipation Internally Limited z Storage Temperature Range -40 to 150 °C z Thermal Resistance Junction to Case, θJC 18 °C/W z Lead Temperature (Soldering, 10 Seconds) 260 °C z Thermal Resistance Junction to Ambient, θJA 160 °C/W * 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 Limits Reference Voltage (Adjustable version) VREF V IN = 5V, IOUT = 10mA 1.25V 1.23VMin 1.27VMax Output Voltage (Fixed version) VO V IN = 5V, IOUT = 10mA VO 0.98VO(Min) 1.02VO(Max) Dropout Voltage V D ΔVREF = 1%, IOUT = 0.8A 1.2V 1.45V Line Regulation REG (LINE) (VOUT + 1.5V) ≤ VIN ≤ 15V, IOUT = 10mA 0.5% 2% Load Regulation REG (LOAD) (VIN -VOUT) = 2V, 10mA ≤ IOUT ≤ 0.8A 0.5% 2.5% Minimum Load Current IO 1.5V ≤ (VIN -VOUT) ≤ 5.75V 10mA Adjust Pin Current I ADJ 55µA 100 µA Current Limit I CL V IN - VOUT = 2V 1.2A 0.9A (Min) RMS Output Noise V N 0.003% of VOUT Ripple Rejection Ratio RA f = 120Hz, CADJ = 22µF for ADJ pin, VIN = 5V, IOUT = 0.8A 72dB 60dB (Min)
SOT-89,TO-92 AUG-30-2001 0.8A Fixed and Adjustable Low Dropout Linear Regulator (LDO) NIKO-SEM ELECTRICAL CHARACTERISTICS FOR FIXED 3.3V(Unless otherwise specified, TA = 25 °C) Parameter Symbol Test Conditions Typical Limits Output Voltage (Fixed version) VO V IN = 5V, IOUT = 10mA VO 3.234V (Min) 3.367V (Max) Dropout Voltage V D ΔVO = 1%, IOUT = 0.8A 1.2V 1.45V Line Regulation REG (LINE) (VOUT + 1.5V) ≤ VIN ≤ 15V, IOUT = 10mA 0.5% 2.0% Load Regulation REG (LOAD) (VIN -VOUT) = 2V, 10mA ≤ IOUT ≤ 0.8A 0.5% 2.0% Minimum Load Current IO 1.5V ≤ (VIN -VOUT) ≤ 5.75V 10mA GND Pin Current I GND 55µA 100 µA Current Limit I CL V IN - VOUT = 2V 1.2A 0.9A (Min) RMS Output Noise V N 0.003% of VOUT Ripple Rejection Ratio RA f = 120Hz, Co=22Uf,VIN = 5V, I OUT = 0.8A 72dB 60dB (Min) DEVICE SELECTION GUIDE Device L1087C L1087C-3.3 L1087N-3.3 Voltage Version Adjustable 3.3V 3.3V Package SOT-89 SOT-89 TO-92 Marking L1087 87-3.3 87N-3.3
SOT-89,TO-92 AUG-30-2001 0.8A Fixed and Adjustable Low Dropout Linear Regulator (LDO) NIKO-SEM PIN CONFIGURATIONS Pin # Function
1 Adjust/Ground
2 Output
3 Input
Note: TAB is Output Pin Pin # Function
1 Output
2 Adjust/Ground
SOT-89,TO-92 AUG-30-2001 0.8A Fixed and Adjustable Low Dropout Linear Regulator (LDO) NIKO-SEM SOT-89 MECHANICAL DATA mm mm F 0.4 0.45 0.5 M G 0.4 0.5 0.6 N
SOT-89,TO-92 AUG-30-2001 0.8A Fixed and Adjustable Low Dropout Linear Regulator (LDO) NIKO-SEM TO-92 MECHANICAL DATA mm mm B 4.318 5.334 I 0.356 0.533 C 12.7 15.5 J D 0.356 0.533 K E 1.143 1.27 1.397 L F 3.175 4.191 M G 0.762 1.270 N