Low Dropout Voltage Regulator www.fairchildsemi.com Features Limited input voltage and high efficiency. Internal thermal over load protection. 6V load dump protection. Output current up to.1a. Description KA76L5 is a fixed 3-terminal low dropout voltage regulator designed to need very low quiescent current. Internally, implemented circuits include 6V load dump protection, -5V reverse transient short circuit and thermal over load protection. TO-92 1 1: Output 2: GND 3: Input Internal Block Diagram Input VI 3.6V MAX DROP PASS ELEMENT Output VO 1 OVER VOLTAGE PROTECTION CURRENT LIMIT START + _ THERMAL SHUTDOWN REFERENCE VOLTAGE GND 2 Rev. 1.. 21 Fairchild Semiconductor Corporation
Absolute Maximum Ratings Parameter Symbol Value Unit Input Voltage Vi 33 V Over Protection Voltage V(OP) 6 V Operating Temperature Range TOPR -4~+125 C Maximum Junction Temperature TJ 15 C Storage Temperature Range TSTG -65~+15 C Electrical Characteristics (VI =14V, IO =1mA, CO =1µF, TA = 25 o C) Parameter Symbol Conditions Min. Typ. Max. Unit Output Voltage (I) VO (I) VI = 14V, IO = 1mA 4.81 5. 5.19 V Output Voltage (II) VO (II) VI = 6 ~ 26V, IO = 1mA TJ = -4 ~ +125 o C 4.75 5. 5.25 V Line Regulation (I) VO (I) VI = 9 ~ 16V, IO = 1mA - 2. 1 mv Line Regulation (II) VO (II) VI = 6 ~ 26V, IO = 1mA - 4. 3 mv Load Regulation VO (III) VI = 14V, IO = 5 ~ 1mA - 1 5 mv Output Impedance ZO VI = 14V, IO = 1mA - 1 6 mω Quiescent Current (I) IQ (I) VI = 6 ~ 26V, IO 1mA -.1 1. ma Quiescent Current (II) IQ (II) VI = 14V, IO 1mA - 5. 3 ma Output Noise Voltage VN VI = 14V, IO = 1mA, f = 1Hz ~ 1KHz - 15 1 µvrms Ripple Rejection RR VI = 14V, IO = 1mA, f = 12Hz 55 8 - db Dropout Voltage (I) VD (I) IO = 1mA, VD = VI - VO -.3.2 V Dropout Voltage (II) VD (II) IO = 1mA, VD = VI - VO -.1.6 V Max Operational Input Voltage VIN IO = 1mA 26 33 - V Max Line Transient VLT(MAX) VI = 14V, IO =1mA, Time =1ms 6 7 - V Reverse Polarity Input Voltage DC VI(DC) VI = 14V, IO = 1mA, VO -.3V - 15-3 - V Reverse Polarity Input Voltage Transient VI(TR) VI = 14V, IO = 1mA, Time 1ms - 5-8 - V Peak Output Current IPK VI = 14V 2 4 6 ma 2
Typical Perfomance Characteristics 7 FIG.1 Output Voltage vs. Input Voltage 1 FIG.2 Quiescent vs. Input Voltage Output voltage Vo(V) 6 5 4 3 2 1 5 1 15 Input voltage Vin (V) Quiescent current Iq(mA) 8. 6. 4. 2. RL= 5 Ω RL= 5 Ω 1 2 3 4 5 Input voltage Vin (V) Figure 1. Output Voltage vs. Input Voltage Figure 2. Quiescent Current vs. Input Voltage Ripple Rejection Ratio( db ) 9 85 75 FIG.3 Ripple Rejection vs. Output Voltage VIN = 14V VOUT = 5.V f = 12 Hz TJ = 25 Dropout voltage Vdrop( mv ) 24 2 16 12 8 4 FIG.4 Drop Voltage vs. Output Current VIN = 14V VOUT = 1 mv TJ = 25 65 2 4 6 8 1 Output Current ( ma ) 2 4 6 8 1 Output Current ( ma ) 12 Figure 3. Ripple Rejection vs. Output Voltage Figure 4. Drop Voltage vs. Output Current 5.6 FIG.5 Output Voltage vs. Temperature(Tj) 1 FIG.6 Quiescent Current vs. Temperature(Tj) Outout voltage Vo(V) 5.4 5.2 5. 4.98 4.96 4.94 Quiescent current Iq(mA).8.6.4.2 4.92-25 25 5 75 1 125 Temperature Tj( ) -25 25 5 75 1 125 Junction temperature Tj( ) Figure 5. Output Voltage vs. Temperature(Tj) Figure 6. Quiescent Current vs. Temperature(Tj) 3
Typical Application VI 3 1 KA76L5 VO C I.1µF I Q 2 Co 1 µ F Figure 1. Application Circuit Ci is required if regulator is located an appreciable distance from power supply filter. Co improves stability. 4
Mechanical Dimensions Package Dimensions in millimeters TO-92 4.58 +.25.15 3.86MAX.46 ±.1 1.27TYP [1.27 ±.2] 1.2 ±.1.38 +.1.5 1.27TYP [1.27 ±.2] 3.6 ±.2 (R2.29) (.25) 14.47 ±.4 4.58 ±.2.38 +.1.5 5
Ordering Information Product Number Package Operating Temperature KA76L5Z TO-92-4 C to + 125 C 6
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