R1171x SERIES 2.0A/1.5A LDO REGULATOR NO. EA-125-1018 OUTLINE The R1171x Series are CMOS-based positive voltage regulator ICs. The R1171x Series have features of low dropout voltage, high output voltage accuracy, low consumption current. Each of these ICs consists of a voltage reference unit, an error amplifier, resistor net for setting output voltage, a current limit circuit at short mode, a chip enable circuit, and thermal-shunt circuit. The output voltage of R1171 is fixed in the IC. Low consumption current by the merit of CMOS process and built-in transistors with low ON-resistance make low dropout voltage and chip enable function prolongs the battery life. These regulators are remarkable improvement on the current regulators in terms of input transient response, and load transient response. Thus, the R1171x Series are suitable for various power sources. Since the packages for these ICs are high wattage HSOP-6J package, TO-252-5L (Under Development), high density mounting of the ICs on boards is possible. FEATURES * Low Supply Current...................................................... Typ. 130A * Low Standby Current.................................................... Typ. 0.1A * Output Current.............................................................. Min. 1.5A (VIN=VOUT+1.0V, R1171SxxxA/B) Min. 2.0A (VIN=VOUT+1.0V, R1171JxxxC/D) (Under Development) * Output Voltage.............................................................. Stepwise setting with a step of 0.1V in the range of 1.5V to 5.0V for A/B Versions, 1.8V to 5.0V for C/D Versions. * Output Voltage Accuracy .............................................. 2.0% * Low Dropout Voltage .................................................... Typ. 0.09V (VOUT=3.0V, IOUT=300mA) * Line Regulation ............................................................ Typ. 0.05%/V * Packages...................................................................... HSOP-6J, TO-252-5L (Under Development) * Built-in Current Limit Circuit * Built-in Thermal Shunt Circuit * Low Temperature-drift Coefficient of Output Voltage ... Typ. 100ppm/C * Ceramic capacitor for phase compensation................. CIN=COUT=Ceramic 10.0F (VOUT<1.8V) CIN=COUT=Ceramic 4.7F (VOUT > = 1.8V) APPLICATIONS * * * * Local Power source for Notebook PC. Local Power source for portable appliances, cameras, and videos. Local Power source for equipment of battery-use. Local Power source for home appliances. 1 R1171x BLOCK DIAGRAMS R1171SxxxA VDD 6 R1171SxxxB 1 VOUT 2 GND Vref VDD 6 GND 5 GND 1 VOUT 4 GND 3 GND R1171JxxxD (Under Development) 1 VOUT 4 GND Vref VDD 5 Vref Current Limit Current Limit 2 GND CE 3 R1171JxxxC (Under Development) CE 2 2 Current Limit 5 VDD 5 VOUT Vref Current Limit CE 3 1 3 GND CE 2 R1171x SELECTION GUIDE The output voltage, the chip-enable polarity, the taping type can be selected at the user's request. The selection can be made with the part number as follows; R1171xxx1x-xx Part Number a b Code a b c d c d Contents Package Type; S: HSOP-6J J: TO-252-5L (Under Development) Designation of Output Voltage (VOUT) Stepwise setting with 0.1V increment in the range from 1.5V to 5.0V(A/B version), from 1.8V to 5.0V(C/D version: Under Development) "Exception" 2.85V type: R1171x281x5-xx, 1.85V Type: R1171x181x5 Designation of option; A: Built-in Chip Enable Circuit, Active at "L" (Output Current: Min. 1.5A) B: Built-in Chip Enable Circuit, Active at "H" (Output Current: Min.1.5A) C: Built-in Chip Enable Circuit, Active at "L" (Output Current: Min.2.0A)*Under Development D: Built-in Chip Enable Circuit, Active at "H" (Output Current: Min.2.0A)*Under Development Designation of Taping Type; E2 (HSOP-6J) (Refer to Taping Specifications) TO-252-5L: unfixed 3 R1171x PIN CONFIGURATION HSOP-6J 6 TO-252-5L (Under Development) 5 4 2 3 R 1 1 2 3 4 5 PIN DESCRIPTION * * HSOP-6J TO-252-5L (Under Development) Pin No Symbol Description Pin No Symbol Description 1 VOUT Voltage Regulator Output Pin 1 VOUT Voltage Regulator Output Pin 2 GND Ground Pin 2 CE or CE 3 CE or CE Chip Enable Pin 3 GND Ground Pin 4 NC No Connection 4 GND Ground Pin 5 GND Ground Pin 5 VDD 6 VDD Chip Enable Pin Input Pin Input Pin ABSOLUTE MAXIMUM RATINGS Symbol Item Rating Unit 7.0 V VIN Input Voltage VCE Input Voltage ( CE or CE Input Pin) -0.3 ~ VIN+0.3 V VOUT Output Voltage -0.3 ~ VIN+0.3 V IOUT Output Current 3.5 A PD Power Dissipation (HSOP-6J)1 Power Dissipation (TO-252-5L) 1 1700 Topt Operating Temperature -40 ~ 85 C Tstg Storage Temperature -55 ~ 125 C 1 For Power Dissipation, please refer to PACKAGE INFORMATION to be described. 4 mW Under Development R1171x ELECTRICAL CHARACTERISTICS * R1171Sxx1A Topt=25C Symbol Item Conditions Min. VOUT Output voltage VIN-VOUT=1.0V IOUT=200mA x0.98 IOUT Output Current VIN-VOUT=1.0V 1.5 VOUT/ IOUT Load regulation VIN-VOUT=1.0V 1mA < = IOUT < = 300mA VDIF Dropout Voltage IOUT=300mA ISS Supply Current Istandby VOUT/ VIN RR VIN VOUT/ Topt Ilim Standby Current Line regulation IOUT=200mA Ripple Rejection f=1kHz, Ripple 0.5Vp-p Input Voltage Short Current Limit VOUT=0V V 60 mV 320 A 0.1 2.0 A Refer to Electrical Characteristics by Output Voltage < = 85C 6.0 V 100 ppm/C 200 mA 10.0 M 1.2 VIN V 0.00 0.25 V Pull-up resistancefor CE pin 2.5 VCEH CE Input Voltage "H" VCEL CE Input Voltage "L" Thermal Shutdown Detector Threshold Temperature Thermal Shutdown Released Temperature TTSR x1.02 130 2.1 IOUT=10mA -40C < = Topt Unit Refer to Electrical Characteristics by Output Voltage VIN-VOUT = 1.0V VCE=GND VIN-VOUT=1.0V VIN=VCE Output Voltage Temperature Coefficient Max. A 30 RPU TTSD Typ. 5.0 Junction Temperature 150 C Junction Temperature 120 C 5 R1171x * R1171Sxx1B Topt=25C Symbol Conditions Min. VOUT Reference Voltage for Adjustable Voltage Regulator VIN-VOUT=1.0V IOUT=200mA x0.98 IOUT Output Current VIN-VOUT=1.0V 1.5 VOUT/ IOUT Load regulation VIN-VOUT=1.0V 1mA < = IOUT < = 300mA VDIF Dropout Voltage IOUT=300mA ISS Supply Current VIN-VOUT=1.0V VCE=VIN Standby Current VIN-VOUT=1.0V VCE=GND Line regulation IOUT=200mA Ripple Rejection f=1kHz, Ripple 0.5Vp-p Istandby VOUT/ VIN RR VIN VOUT/ Topt Ilim RPD VCEH VCEL TTSD TTSR 6 Item 30 -40C Short Current Limit Pull-down resistance for CE pin CE Input Voltage "H" VOUT=0V < = Topt < = Unit x1.02 V 60 mV Refer to Electrical Characteristics by Output Voltage Table 130 320 A 1.0 A Refer to Electrical Characteristics by Output Voltage Table 2.1 Output Voltage Temperature Coefficient Max. A 0.3 Input Voltage CE Input Voltage "L" Thermal Shutdown Detector Threshold Temperature Thermal Shutdown Released Temperature Typ. 85C 6.0 V 100 ppm/C 200 mA 10.0 M 1.2 VIN V 0.00 0.25 V 2.5 5.0 Junction Temperature 150 C Junction Temperature 120 C R1171x * R1171Jxx1C (Under Development) Topt=25C Symbol Item Conditions Min. VOUT Output voltage VIN-VOUT=1.0V IOUT=200mA x0.98 IOUT Output Current VIN-VOUT=1.0V 2.0 VOUT/ IOUT Load regulation VIN-VOUT=1.0V 1mA < = IOUT < = 300mA VDIF Dropout Voltage IOUT=300mA ISS Supply Current Istandby VOUT/ VIN RR VIN VOUT/ Topt Ilim Standby Current Line regulation Ripple Rejection IOUT=200mA f=1kHz,Ripple 0.5Vp-p Input Voltage Short Current Limit VOUT=0V V 60 mV 320 A 0.1 2.0 A Refer to Electrical Characteristics by Output Voltage < = 85C 6.0 V 100 ppm/C 200 mA 10.0 M 1.2 VIN V 0.00 0.25 V Pull-up resistancefor CE pin 2.5 VCEH CE Input Voltage "H" VCEL CE Input Voltage "L" Thermal Shutdown Detector Threshold Temperature Thermal Shutdown Released Temperature TTSR x1.02 130 2.1 IOUT=10mA -40C < = Topt Unit Refer to Electrical Characteristics by Output Voltage VIN-VOUT=1.0V VCE=GND VIN-VOUT = 1.0V VIN=VCE Output Voltage Temperature Coefficient Max. A 30 RPU TTSD Typ. 5.0 Junction Temperature 150 C Junction Temperature 120 C 7 R1171x * R1171Jxx1D (Under Development) Topt=25C Symbol Conditions Min. VOUT Reference Voltage for Adjustable Voltage Regulator VIN-VOUT=1.0V IOUT=200mA x0.98 IOUT Output Current VIN-VOUT=1.0V 2.0 VOUT/ IOUT Load regulation VIN-VOUT=1.0V 1mA < = IOUT < = 300mA VDIF Dropout Voltage IOUT=300mA ISS Supply Current VIN-VOUT=1.0V,VCE=VIN Standby Current VIN-VOUT=1.0V,VCE=GND Line regulation IOUT=200mA Ripple Rejection f=1kHz, Ripple 0.5Vp-p Istandby VOUT/ VIN RR VIN VOUT/ Topt Ilim RPD Input voltage Typ. IOUT=10mA -40C < = Topt Short Current Limit Pull-down resistance for CE pin VOUT=0V < = Unit x1.02 V A 30 60 mV Refer to Electrical Characteristics by Output Voltage 130 320 A 0.1 2.0 A Refer to Electrical Characteristics by Output Voltage 2.1 Output Voltage Temperature Coefficient Max. 85C 2.5 6.0 V 100 ppm/C 200 mA 5.0 10.0 M VCEH CE Input Voltage "H" 1.2 VIN V VCEL CE Input Voltage "L" Thermal Shutdown Detector Threshold Temperature Thermal Shutdown Released Temperature 0.00 0.25 V TTSD TTSR 8 Item Junction Temperature 150 C Junction Temperature 120 C R1171x * Electrical Characteristics by Output Voltage (Topt= =25C) Dropout Voltage (V) Output Voltage VOUT (V) Typ. Max. 1.5 < = VOUT<1.6 0.16 0.35 1.6 < = VOUT<1.7 0.14 0.32 1.7 < = VOUT<1.8 0.13 0.28 1.8 < = VOUT<2.0 0.12 0.24 2.0 < = VOUT<2.5 0.10 0.21 0.09 0.18 2.5 < = VOUT < = 5.0 Output Voltage VOUT (V) 1.5 < = < = 1.6 VOUT<1.6 VOUT < = 5.0 Output Voltage VOUT (V) 1.5 4.7 < = < = VOUT<4.7 VOUT < = 5.0 Load regulation VIN (%/V) VOUT/ Condition 2.1 < = VOUT+0.5V VOUT<6.0 < = VIN < = Typ. Max. 0.05 0.30 6.0V Ripple Rejection RR (dB) Condition VIN-VOUT=1.0V VIN=5.75V Typ. 50 9 R1171x TEST CIRCUITS CE VDD IN CE VOUT R1171xxx1B Series OUT VDD IN IOUT OUT ISS CIN CIN COUT GND Supply Current Test Circuit CE VDD CE VOUT R1171xxx1B Series COUT GND Standard Test Circuit IN VOUT R1171xxx1B Series OUT VDD IN VOUT OUT R1171xxx1B Series IOUT GND COUT Test Circuit for Ripple Rejection, Input Transient Response 10 COUT CIN P.G. GND I1 I2 Test Circuit for Load Transient Response R1171x TYPICAL CHARACTERISTICS 1) Output Voltage vs. Output Current (Topt=25C) R1171S151x R1171S201x 2.5 VIN=3.0V VIN=2.5V 1.6 Output Voltage VOUT(V) Output Voltage VOUT(V) 1.8 1.4 1.2 1.0 VIN=2.0V 0.8 0.6 0.4 VIN=3.5V 0.2 2.0 1.5 VIN=2.5V 1.0 0.5 VIN=4.0V 0 0 0 500 1000 1500 2000 2500 3000 3500 Output Current IOUT(mA) 0 500 1000 1500 2000 2500 3000 3500 Output Current IOUT(mA) R1171S301x R1171S501x 6 VIN=6.0V VIN=4.0V 3.0 Output Voltage VOUT(V) Output Voltage VOUT(V) 3.5 2.5 2.0 VIN=3.5V 1.5 1.0 0.5 VIN=5.0V 0 5 4 VIN=5.5V 3 2 1 0 0 500 1000 1500 2000 2500 3000 3500 Output Current IOUT(mA) 0 500 1000 1500 2000 2500 3000 3500 Output Current IOUT(mA) 2) Output Voltage vs. Input Voltage (Topt= =25C) R1171x151B R1171x201B 2.3 IOUT=1mA IOUT=10mA IOUT=100mA IOUT=300mA IOUT=500mA 1.7 1.6 Output Voltage VOUT(V) Output Voltage VOUT(V) 1.8 1.5 1.4 1.3 1.2 2.2 2.1 2.0 1.9 IOUT=1mA IOUT=10mA IOUT=100mA IOUT=300mA IOUT=500mA 1.8 1.7 1.6 1.5 1 2 3 4 5 Input Voltage VIN(V) 6 1 2 3 4 5 Input Voltage VIN(V) 6 11 R1171x R1171x501B 5.3 3.2 5.2 Output Voltage VOUT(V) Output Voltage VOUT(V) R1171x301B 3.3 3.1 3.0 2.9 IOUT=1mA IOUT=10mA IOUT=100mA IOUT=300mA IOUT=500mA 2.8 2.7 2.6 2.5 2 3 4 5 Input Voltage VIN(V) 5.1 5.0 4.9 4.8 IOUT=1mA IOUT=10mA IOUT=300mA IOUT=500mA 4.7 4.6 4.5 4.0 6 4.5 5.0 5.5 Input Voltage VIN(V) 6.0 3)Dropout Voltage vs. Output Current R1171S201x 25C 85C -40C 0 Dropout Voltage VDIF(V) Dropout Voltage VDIF(V) R1171S151x 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 250 500 750 1000 1250 1500 Output Current IOUT(mA) 25C 85C -40C 0 25C 85C -40C 0 12 R1171S501x 250 500 750 1000 1250 1500 Output Current IOUT(mA) Dropout Voltage VDIF(V) Dropout Voltage VDIF(V) R1171S301x 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 250 500 750 1000 1250 1500 Output Current IOUT(mA) 1.0 0.9 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 25C 85C -40C 0 250 500 750 1000 1250 1500 Output Current IOUT(mA) R1171x 4) Output Voltage vs. Temperature R1171x151B R1171x201B VIN=2.5V, IOUT=200mA VIN=3.0V, IOUT=200mA 2.10 Output Voltage VOUT(V) Output Voltage VOUT(V) 1.60 1.55 1.50 1.45 1.40 -50 -25 0 25 50 75 Temperature Topt(C) 2.05 2.00 1.95 1.90 -50 100 -25 R1171x301B 5.20 3.15 5.15 Output Voltage VOUT(V) Output Voltage VOUT(V) VIN=5.0V, IOUT=200mA 3.20 3.10 3.05 3.00 2.95 2.90 2.85 -25 100 R1171x501B VIN=4.0V, IOUT=200mA 2.80 -50 0 25 50 75 Temperature Topt(C) 0 25 50 75 Temperature Topt(C) 5.10 5.05 5.00 4.95 4.90 4.85 4.80 -50 100 -25 0 25 50 75 Temperature Topt(C) 100 5) Supply Current vs. Input Voltage (Topt= =25C) R1171x201B 350 350 300 300 Supply Current ISS(A) Supply Current ISS(A) R1171x151B 250 200 150 100 50 0 250 200 150 100 50 0 0 1 2 3 4 Input Voltage VIN(V) 5 6 0 1 2 3 4 Input Voltage VIN(V) 5 6 13 R1171x R1171x501B 350 300 300 Supply Current ISS(A) Supply Current ISS(A) R1171x301B 350 250 200 150 100 50 0 250 200 150 100 50 0 0 1 2 3 4 Input Voltage VIN(V) 5 6 0 1 2 3 4 Input Voltage VIN(V) 5 6 6) Supply Current vs. Temperature R1171x151B R1171x201B VIN=3.0V 350 350 300 300 Supply Current ISS(A) Supply Current ISS(A) VIN=2.5V 250 200 150 100 50 0 -50 -25 0 25 50 75 Temperature Topt(C) 250 200 150 100 50 0 -50 100 -25 R1171x301B 350 300 300 Supply Current ISS(A) Supply Current ISS(A) 14 VIN=6.0V 350 250 200 150 100 50 -25 100 R1171x501B VIN=4.0V 0 -50 0 25 50 75 Temperature Topt(C) 0 25 50 75 Temperature Topt(C) 100 250 200 150 100 50 0 -50 -25 0 25 50 75 Temperature Topt(C) 100 R1171x 7) Dropout Voltage vs. Set Output Voltage (Topt= =25C) R1171Sxx1x Dropout Voltage VDIF(V) 0.8 IOUT=1500mA IOUT=1000mA IOUT=600mA IOUT=200mA 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 1 2 3 4 Set Output Voltage VSET(V) 5 8) Ripple Rejection vs. Frequency R1171x151B R1171x201B VIN=3.0V+0.5Vp-p 80 80 70 70 Ripple Rejection RR(dB) Ripple Rejection RR(dB) VIN=2.5V+0.5Vp-p 60 50 40 30 20 10 0 0.1 IOUT=1mA IOUT=10mA IOUT=100mA IOUT=200mA IOUT=500mA 1.0 10.0 Ripple Frequency f(kHz) 60 50 40 30 20 10 0 0.1 100.0 R1171x301B 70 70 Ripple Rejection RR(dB) Ripple Rejection RR(dB) 80 60 50 20 10 0 0.1 IOUT=1mA IOUT=10mA IOUT=100mA IOUT=200mA IOUT=500mA 1.0 10.0 Ripple Frequency f(kHz) 100.0 VIN=5.75V+0.5Vp-p 80 30 1.0 10.0 Ripple Frequency f(kHz) R1171x501B VIN=4.0V+0.5Vp-p 40 IOUT=1mA IOUT=10mA IOUT=100mA IOUT=200mA IOUT=500mA 100.0 60 50 40 30 20 10 0 0.1 IOUT=1mA IOUT=10mA IOUT=100mA IOUT=200mA IOUT=500mA 1.0 10.0 Ripple Frequency f(kHz) 100.0 15 R1171x 9) Ripple Rejection vs. Input Voltage R1171x301x R1171x301x IOUT=1mA,COUT=4.7F IOUT=10mA,COUT=4.7F 70 80 f=400Hz Ripple Rejection RR(dB) Ripple Rejection RR(dB) 80 60 50 f=1kHz 40 30 f=10kHz 20 10 0 3.1 3.2 3.3 3.4 Input Voltage VIN(V) 70 60 50 40 30 f=1kHz 40 f=10kHz 20 10 0 3.1 3.2 3.3 3.4 Input Voltage VIN(V) 3.5 R1171x301x IOUT=500mA,COUT=4.7F Ripple Rejection RR(dB) 80 70 60 50 f=1kHz 30 20 0 3.1 16 f=400Hz 40 10 IOUT=300mA,COUT=4.7F f=10kHz 3.2 3.3 3.4 Input Voltage VIN(V) 3.5 Ripple Rejection RR(dB) Ripple Rejection RR(dB) 60 30 3.5 80 f=400Hz 50 3.2 3.3 3.4 Input Voltage VIN(V) R1171x301x IOUT=100mA,COUT=4.7F 70 f=10kHz 10 R1171x301x 80 f=1kHz 20 0 3.1 3.5 f=400Hz 70 60 50 f=400Hz f=1kHz 40 30 f=10kHz 20 10 0 3.1 3.2 3.3 3.4 Input Voltage VIN(V) 3.5 R1171x 10) Input Transient Response (Topt= =25C) R1171x151B 4.0 1.75 3.5 1.70 3.0 Input Voltage 1.65 2.5 1.60 2.0 1.55 1.5 Output Voltage 1.50 1.0 1.45 0.5 1.40 Input Voltage VIN(V) Output Voltage VOUT(V) tr=tf=5s, IOUT=1000mA, COUT=Ceramic 10F 1.80 0 0 20 40 60 80 100 120 Time t(s) 140 160 180 200 R1171x201B 4.5 2.25 4.0 2.20 3.5 Input Voltage 2.15 3.0 2.10 2.5 2.05 2.0 Output Voltage 2.00 1.5 1.95 1.0 1.90 0 20 40 60 80 100 120 Time t(s) 140 160 180 Input Voltage VIN(V) Output Voltage VOUT(V) tr=tf=5s, IOUT=1000mA, COUT=Ceramic 4.7F 2.30 0.5 200 R1171x301B tr=tf=5s, IOUT=1000mA, COUT=Ceramic 4.7F 5.5 5.0 3.15 Input Voltage 3.10 4.5 4.0 3.5 3.05 Output Voltage 3.00 3.0 2.5 2.0 2.95 Input Voltage VIN(V) Output Voltage VOUT(V) 3.20 1.5 2.90 0 20 40 60 80 100 120 Time t(s) 140 160 180 1.0 200 17 R1171x R1171x501B 7.5 5.25 7.0 5.20 6.5 Input Voltage 5.15 6.0 5.10 5.5 5.05 5.0 Output Voltage 5.00 4.5 4.95 4.0 4.90 0 20 40 60 80 100 120 Time t(s) 140 160 180 Input Voltage VIN(V) Output Voltage VOUT(V) tr=tf=5s, IOUT=1000mA, COUT=Ceramic 4.7F 5.30 3.5 200 11) Load Transient Response (Topt= =25C) R1171x151B 2000 1500 1000 500 0 Output Current Output Voltage 0 20 40 60 80 100 120 Time t(s) 140 160 180 Output Current IOUT(mA) Output Voltage VOUT(V) tr=tf=10s, VIN=2.5V, COUT=Ceramic 10F 1.85 1.80 1.75 1.70 1.65 1.60 1.55 1.50 1.45 1.40 1.35 200 R1171x201B Output Current Output Voltage 0 18 2000 1500 1000 500 0 20 40 60 80 100 120 Time t(s) 140 160 180 200 Output Current IOUT(mA) Output Voltage VOUT(V) tr=tf=10s, VIN=3.0V, COUT=Ceramic 4.7F 2.35 2.30 2.25 2.20 2.15 2.10 2.05 2.00 1.95 1.90 1.85 R1171x R1171x301B 2000 1500 1000 500 0 Output Current Output Voltage 0 20 40 60 80 100 120 Time t(s) 140 160 180 Output Current IOUT(mA) Output Voltage VOUT(V) tr=tf=10s, VIN=4.0V, COUT=Ceramic 4.7F 3.35 3.30 3.25 3.20 3.15 3.10 3.05 3.00 2.95 2.90 2.85 200 R1171x501B Output Current 2000 1500 1000 500 0 Output Voltage 0 20 40 60 80 100 120 Time t(s) 140 160 180 Output Current IOUT(mA) Output Voltage VOUT(V) tr=tf=10s, VIN=6.0V, COUT=Ceramic 4.7F 5.35 5.30 5.25 5.20 5.15 5.10 5.05 5.00 4.95 4.90 4.85 200 19 R1171x Technical Notes on External Components and Typical Application 1. Phase Compensation In these ICs, phase compensation is made with the output capacitor for securing stable operation even if the load current is varied. For this purpose, use a capacitor with the capacitance range from 4.7F to 10.0F, as CL. In case that using a tantalum capacitor and the ESR of the tantalum capacitor is too large, unstable operation may result. Fully evaluation is necessary for the whole circuit with considering the frequency characteristic. 2. Mounting on PCB Make VDD and GND lines sufficient. If their impedance is high, large current may flow and the pick-up noise or unstable operation may result. Therefore use a capacitor with a capacitance range from 4.7F to 10.0F between VDD pin and GND pin as close as possible. Both GND pins should be soldered to the same GND plane. Further, set an output capacitor between VOUT pin and GND pin for phase compensation as close as possible. (Refer to the example of typical application) CE VDD IN VOUT OUT R1171Sxx1B CL CI GND R1171Sxx1B Typical Application 1.5V 1.8V < = < = VOUT<1.8V : CI=10F (Ceramic),CL=10F (Ceramic) VOUT < = 5.0V : CI=4.7F (Ceramic),CL=4.7F (Ceramic) 3. Output Short Protection Function In the R1171x Series, the output short protection function is built in, further, if the output is short to the GND or other voltage line, the chip inside is heating, as a result, in case that the junction temperature becomes equal or more than 150C (Typ.), the built-in thermal shutdown circuit works. If the junction temperature becomes equal or more than 150C (Typ.), the IC is protected by the output short protection circuit and the thermal shutdown circuit. 20 R1171x ESR vs. Output Current (Topt=25C, V IN CE = Set Output Voltage+1V, CIN = Ceramic 10F) VOUT R1171xxx1B COUT S.A Spectrum Analyzer VIN GND VIN CIN ESR IOUT As an output capacitor for this IC, Ceramic capacitor is recommendable. However, other low ESR type capacitor can be used with this IC. For your reference, noise level is tested with the circuit as shown above, and if the noise level is 40V or less than 40V, the ESR values are plotted as stable area. Upper limit is described in the next four graphs, or ESR vs. Output Current. (Hatched area is the stable area.) R1171S151x R1171S151x CIN=COUT=Ceramic 10F 100 10 ESR() 10 ESR() CIN=COUT=Ceramic 4.7F 100 1 0.1 1 0.1 0.01 0.01 0 250 500 750 1000 1250 1500 Output Current IOUT(mA) 0 250 500 750 1000 1250 1500 Output Current IOUT(mA) 21 R1171x R1171S301x R1171S301x CIN=COUT=Ceramic 4.7F 100 10 ESR() 10 ESR() CIN=COUT=Ceramic 2.2F 100 1 0.1 1 0.1 0.01 0.01 0 250 500 750 1000 1250 1500 Output Current IOUT(mA) 0 R1171S501x R1171S501x CIN=COUT=Ceramic 4.7F 100 10 ESR() ESR() CIN=COUT=Ceramic 2.2F 100 10 1 0.1 1 0.1 0.01 0.01 0 22 250 500 750 1000 1250 1500 Output Current IOUT(mA) 250 500 750 1000 1250 1500 Output Current IOUT(mA) 0 250 500 750 1000 1250 1500 Output Current IOUT(mA)