www.fairchildsemi.com KA78RL00 Adjustable Micro Power Voltage Regulator Features Description • • • • • • • • The KA78RLOO is an adjustable micro power voltage regulator suitable for use in battery-powered systems. This regulator has various functions such as alarm which warns of a low output voltage, often due to falling batteries on the input, the external shutdown which enables the regulator to be switched on and off, current and temperature limiting. Low Quiescent Current Low Dropout Voltage Low Temperature Coefficient Tight Line and Load Regulation Guaranteed 100mA Output Current Internal Short Current & Thermal Limit Error Signals of Output Dropout (8 pin Versions Only) External Shut-down ( 8 pin Versions Only) 8-SOP 1 Internal Block Diagram OUT(1) INPUT(8) + ERROR AMPLIFIER PROGRAM - FEEDBACK(7) (2) + C1 SHUTDOWN(3) FROM EXTERNAL INPUT + OFFSE SCP ERROR ERROR COMPARATOR COMPARATO + TAP(6) T 1.25V + R REFERENCE GROUND(4) ERROR(5) TO EXTERNAL INPUT Rev. 1.0.0 ©2001 Fairchild Semiconductor Corporation KA78RL00 Absolute Maximum Ratings Parameter 2 Symbol Value Unit Input Supply Voltage VIN -0.3 ~ +30 V Power Dissipation PD Internally Limited W Thermal Resistance Junction-Air RθJA 127.5 °C/W Storage Temperature Range TSTG -65 ~ +150 °C Operating Junction Temperature Range TOPR -40 ~ +125 °C KA78RL00 Electrical Characteristics (Refer to the test circuit, Ta = 25 °C, unless otherwise specified ) Parameter Symbol Conditions Min. Typ. Max. Unit ALL VOLTAGE OPTIONS Output Voltage Temperature Coefficient ∆V/∆T (Note1) - 50 - ppm/°C Line Regulation (Note2) ∆V (Vo + 1)V ≤ VIN ≤ 28V IL = 50mA - - 0.4 % Load Regulation (Note2) ∆V 100uA ≤ IL ≤ 100mA - - 0.3 % Dropout Voltage VD IL = 100uA - - 150 mV IL = 100mA - - 600 mV Ground Current IG IL = 100uA - - 140 uA IL = 100mA - - 7 mA Current Limit ICL 110 165 220 mA VO = 0V 8-PIN VERSIONS ONLY Reference Voltage VREF VREF (Note3) 1.235 1.26 1.285 V 1.225 1.26 1.295 V ERROR COMPARATOR Output Low Voltage VOL VIN = (Vo - 0.5)V, IOL =400uA - 150 400 mV High Threshold Voltage VTH (Note4) 25 60 - mV Low Threshold Voltage VTL (Note4) - 75 140 mV VHYS (Note4) - 15 - mV Shutdown Threshold Range VSD (Note5) 0.6 1.3 2.0 V Shutdown Input Current ISD VSD = 2.4V - 30 100 uA VSD = 28V - 450 750 uA Hysteresis SHUTDOWN INPUT Note : 1. Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range. 2. Regulation is measured at constant junction temperature , using pulse testing with a low duty cycle. 3. Vref ≤ Vout ≤ (Vin - 1V), 2.5V ≤ Vin ≤ 28V, 100uA ≤ IL ≤ 100mA, TA ≤ TAMAX . 4. Threshold and hysteresis are expressed in terms of voltage differential at the Feedback terminal below the normal reference . To express these thresholds in terms of output voltage change , multiply by the error amplifier gain = VO / VREF = (R1 + R2) / R2 . 5. Vshutdown ≤ 0.6 V , VOUT =ON , Vshutdown ≥ 2.0 V, VOUT = OFF. 3 KA78RL00 Typical Performance Characteristics 6 O UT P UT VOL T A G E (V GROUND CURRENT(mA) 2.0 1.6 1.2 0.8 0.4 5 5V OUTPUT RL=50Ω 3 2 1 0 0.1 1 10 100 0 1 2 4 5 6 Figure 2. Dropout Characteristics Figure 1. Quiescent Current 250 120 RL=50Ω 200 INPUT CUR RE NT(mA) 5V OUTPUT INPUT CURRENT(uA) 3 INP UT VO L T A G E (V) LOAD CURRENT(mA) RL=50K 150 100 RL=∞ 50 100 80 60 40 20 0 0 0 2 4 6 8 10 0 2 4 Figure 3. Input Current 8 10 Figure 4. Input Current 200 5.06 5V OUTPUT S HO R T C IR C UIT C UR R E NT (m A 5.04 6 INP UT VOLT AGE (V ) INPUT VOLTAGE(V) OUTPUT VOLTAGE(V) RL=50KΩ 4 5.02 5.00 4.98 4.96 180 160 140 120 4.94 -50 -25 0 25 50 75 100 125 TEMPERATURE(oC) Figure 5. Output Voltage vs. Temperature 4 100 -5 0 -2 5 0 25 50 75 100 T E M P E R A T UR E ( o C ) Figure 6. Short Circuit Current 125 KA78RL00 Typical Performance Characteristics (Continued) TYPICAL PERFORMANCE CHARACTERISTICS (Continued ) Fig. 8 Dropout Voltage Fig. 7 Dropout Voltage 600 500 I = 100mA L 400 DROPOUT VOLTAGE(mV) DROPOUT VOLTAGE(V) 500 400 300 200 µA IL = 100µ 100 0 -50 -25 0 25 50 75 100 o TEMPERATURE( C) Figure 7. Dropout Voltage 300 200 o TJ = 25 C 100 125 0 0.1 1 10 100 OUTPUT CURRENT(mA) Figure 8. Dropout Voltage 5 KA78RL00 Typical Application VIN 8 VIN ERROR SHUTDOWN 5 ERROR V 1 OUT KA78RLOOD 3 SD GND 4 VOUT R1 FB 7 VREF R2 VO = VREF (1+ R1/ R2)+IFB R1 CO is required between the output and ground for stability at output voltages of 5V or more. since IFB is controlled to less than 40nA, the error associated with this term is negligible in most applications. At lower output voltage, more capacitance is required. without this capacitance the part will oscillate. 6 Co 1 µF KA78RL00 Mechanical Dimension Package Dimensions in millimeters 8-SOP MIN #5 1.80 MAX 0.071 3.95 ±0.20 0.156 ±0.008 5.72 0.225 0~ 8° +0.10 0.15 -0.05 +0.004 0.006 -0.002 MAX0.10 MAX0.004 6.00 ±0.30 0.236 ±0.012 0.41 ±0.10 0.016 ±0.004 #4 1.27 0.050 #8 5.13 MAX 0.202 #1 4.92 ±0.20 0.194 ±0.008 ( 0.56 ) 0.022 1.55 ±0.20 0.061 ±0.008 0.1~0.25 0.004~0.001 0.50 ±0.20 0.020 ±0.008 7 KA78RL00 Ordering Information 8 Product Number Package Operationg Temperature KA78RL00D 8-SOP -40 ~ +125°C KA78RL00 9 KA78RL00 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com 6/1/01 0.0m 001 Stock#DSxxxxxxxx 2001 Fairchild Semiconductor Corporation