AIC1742 Low Noise, Low Quiescent Current, 150mA Linear Regulator with Noise Bypass FEATURES DESCRIPTION Very Low Noise, 25μVRMS @ f=10~100kHz. AIC1742 is a low noise, low dropout linear regulator, and is housed in a small SOT-23-5 package. The device is in the “ON” state when the SHDN pin is set to logic high level. A low dropout voltage of 90mV at 50mA load current is performed. It offers high precision output voltage of ±2%. The quality of low quiescent current and low dropout voltage makes this device ideal for battery power applications. The internal reverse bias protection eliminates the requirement for a reverse voltage protection diode. The high ripple rejection and low noise of AIC1742 provide enhanced performance for critical applications. The noise bypass pin can be connected an external capacitor to reduce the output noise level. Very Low Quiescent Current, 35μA. Very Low Dropout Voltage, 90mV @ 50mA. Active Low Shutdown Control. Short Circuit and Thermal Protection. 1.5V, 1.8V, 2.0V, 2.5V, 2.8V, 2.85V, 2.9V, 3.0V, 3.3V Output Voltage. Available in ±2% Output Tolerance. Low Profile Package: SOT-23-5 APPLICATIONS Cellular Telephones. Pagers. Personal Communication Equipment. Cordless Telephones. Portable Instrumentation. Portable Consumer Equipment. Radio Control Systems. Low Voltage Systems. Battery Powered Systems TYPICAL APPLICATION CIRCUIT VIN VIN VOUT CIN VOUT COUT 2.2µF 1µF GND BP SHDN V SHDN CBP AIC1742 0.01µF * CIN : TAIYO YUDEN, CEJMK107BJ105MA-T *COUT : TAIYO YUDEN, CEJMK107BJ225Mθ-T Low Noise Low Dropout Linear Regulator Analog Integrations Corporation Si-Soft Research Center DS-1742P-02 010405 3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C. TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw 1 AIC1742 ORDERING INFORMATION AIC1742-XXX XXX XX PIN CONFIGURATION PACKING TYPE TR: TAPE & REEL BG: BAG C: COMMERCIAL ACV: SOT-23-5 BCV: SOT-23-5 P: LEAD FREE COMMERCIAL APV: SOT-23-5 BPV: SOT-23-5 OUTPUT VOLTAGE 15: 1.5V 18: 1.8V 20: 2.0V 25: 2.5V 28: 2.8V 285: 2.85V 29: 2.9V 30: 3.0V 33: 3.3V (Of a unit of 0.1V within the voltage range from 1.5V to 3.3V, additional voltage versions for this product line may be available on demand with prior consultation with AIC.) Example: SOT-23-5 FRONT VIEW (AXV) 1. VIN 2. GND 3. SHDN 4. BP 5. VOUT 5 1 4 2 3 (BXV) 1. VOUT 2. GND 3. VIN 4. SHDN 5. BP AIC1742-15ACVTR 1.5V Version, in SOT-23-5 Package & Tape & Reel Packing Type AIC1742-15APVTR 1.5V Version, in SOT-23-5 Lead Free Package & Tape & Reel Packing Type 2 AIC1742 • SOT-23-5 Marking Part No. ACV APV AIC1742-15AXV ER15 ER15P AIC1742-18AXV ER18 AIC1742-20AXV Part No. BCV BPV AIC1742-15BXV ES15 ES15P ER18P AIC1742-18BXV ES18 ES18P ER20 ER20P AIC1742-20BXV ES20 ES20P AIC1742-25AXV ER25 ER25P AIC1742-25BXV ES25 ES25P AIC1742-28AXV ER28 ER28P AIC1742-28BXV ES28 ES28P AIC1742-285AXV ER2J ER2JP AIC1742-285BXV ES2J ES2JP AIC1742-29AXV ER29 ER29P AIC1742-29BXV ES29 ES29P AIC1742-30AXV ER30 ER30P AIC1742-30BXV ES30 ES30P AIC1742-33AXV ER33 ER33P AIC1742-33BXV ES33 ES33P ABSOLUTE MAXIMUM RATINGS Supply Voltage 9V Shutdown Terminal Voltage .9V Power Dissipation Operating Temperature Range Maximum Junction Temperature Storage Temperature Range 500mW -40ºC~85ºC 125°C -65ºC~150ºC Lead Temperature (Soldering, 10 sec) 260°C Thermal Resistance Junction to Case 130ºC/W Thermal Resistance Junction to Ambient 220ºC/W (Assume no ambient airflow, no heatsink) Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. TEST CIRCUIT Refer to TYPICAL APPLICATION CIRCUIT 3 AIC1742 ELECTRICAL CHARACTERISTICS (TJ=25°C, unless otherwise specified) (Note1) PARAMETER TEST CONDITIONS SYMBOL Quiescent Current VIN = VOUT+ 1V, V SHDN =1.6V, IOUT = 0mA IQ Standby Current VIN = VOUT+ 1V to 8V, V SHDN =0.6V, Output OFF ISTBY GND Pin Current IOUT = 50mA IGND Continuous Output Current VIN = VOUT + 1V to 8V IOUT Output Current Limit VIN = VOUT + 1V, VOUT = 0V Output Voltage Tolerance VIN = VOUT + 1V, no load Temperature Coefficient Line Regulation VIN = VOUT（TYP） + 1V to 8V VIN = 5V, Load Regulation IOUT = 0.1~150mA MIN. IOUT = 100 mA Vout≥2.5V IOUT = 150 mA IIL 150 VOUT -2 Terminal Ripple Rejection Output Noise f=1KHz, Ripple=0.5VP-P, CBP = 0.1µF CBP = 0.1µF, f = 10~100KHz UNIT 35 45 µA 0.1 µA 3.5 mA 150 mA 250 mA 2 % TC 50 150 ppm/ºC ∆VLIR 2 5 mV ∆VLOR 0.005 0.01 %/mA 90 160 140 230 200 350 500 800 VDROP IOUT = 150 mA Vout<2.5V Noise Bypass Voltage MAX. 2.5 IOUT = 50 mA Dropout Voltage TYP. mV VREF 1.25 V RR 65 dB еn 25 µVrms SHUTDOWN TERMINAL SPECIFICATIONS Shutdown Pin Current V SHDN =1.6V Shutdown Pin Voltage (ON) Output ON Shutdown Pin Voltage (OFF) Output OFF Shutdown Exit Delay Time CBP = 0.1µF, COUT = 1µF, IOUT=30mA I SHDN V SHDN （ON） 2 1.6 V V SHDN （OFF） △t µA 0.6 300 V µS Note 1: Specifications are production tested at TA=25°C. Specifications over the -40°C to 85°C operating temperature range are assured by design, characterization and correlation with Statistical Quality Controls (SQC). Note 2: The dropout voltage is defined as VIN – VOUT when VOUT is 1% below the value of VOUT for VIN = VOUT + 0.5V. (Only applicable for VOUT = 2.5V ~ 5V) 4 AIC1742 TYPICAL PERFORMANCE CHARACTERISTICS 60 14 50 Ground Current (mA) Quiescent Current (µA) AIC1742 40 30 TA=25°C 20 VSHDN=1.6V IOUT=0mA 10 0 3 4 5 6 7 8 9 8 6 4 10 0 20 40 60 80 100 120 Input Voltage (V) Output Current (mA) Fig. 1 Quiescent Current Fig. 2 Ground Current 140 1.0 300 AIC1742 250 T=25°C Output Voltage Deviation (%) Short-Circuit Current (mA) 10 2 350 200 150 100 50 0 TA=25°C 12 0 2 AIC1742 0 1 2 3 4 5 6 0.8 0.6 0.4 0.2 0.0 -0.2 VIN=5V -0.4 -0.6 VSHDN=1.6V AIC1742-15 IOUT=0mA -0.8 -1.0 -40 7 AIC1742-33 -20 0 20 40 60 80 Input Voltage (V) Temperature (°C) Fig. 3 Short-Circuit Current Fig. 4 Output Voltage 100 120 35 25 50 AIC1742 AIC1742-15 VIN=5V AIC1742-33 VSHDN=1.6V TA=25°C 20 15 AIC1742-15 10 5 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140 150 Output Current (mA) Fig. 5 Load Regulation Load Regulation (mV) Load Regulation (mV) 30 VSHDN=1.6V 40 TA=25°C 30 20 IOUT=150mA 10 0 2.0 IOUT=100mA 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 Input Voltage (V) Fig. 6 Load Regulation 5 AIC1742 TYPICAL PERFORMANCE CHARACTERISTICS 300 34 VSHDN=1.6V TA=25°C AIC1742-33 32 30 28 26 IOUT=150mA 24 22 20 AIC1742-25 250 Dropout Voltage (mV) Load Regulation (mV) (Continued) IOUT=100mA 200 150 100 50 18 TA=25°C 16 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0 7.5 0 10 8.0 20 30 40 50 Input Voltage (V) 60 70 80 90 100 110 120 130 140 150 Output Current (mA) Fig. 8 Dropout Voltage Fig. 7 Load Regulation 800 Ripple Rejection (dB) Dropout Voltage (mV) 100 AIC1742-20 700 600 500 400 300 200 100 AIC1742-20 80 60 CBP=0.1µF 40 COUT=2.2µF Ceramic 20 TA=25°C 0 10 20 30 40 50 60 70 80 90 100 110 IOUT=0mA 0 10 120 130 140 150 Ripple Rejection (dB) 60 CBP=0.1µF CBP=0.01µF COUT=2.2µF Ceramic 20 3 80 10 10 2 10 3 4 10 10 5 6 10 CBP=0.01µF 60 40 CBP=0.1µF COUT=2.2µF Ceramic 20 IOUT=0mA 0 4 10 AIC1742-20 100 80 40 10 Fig. 10 Input Ripple Rejection AIC1742-30 100 2 10 Frequency (Hz) Output Current (mA) Fig. 9 Dropout Voltage Ripple Rejection (dB) CBP=0.01µF IOUT=100mA 5 10 10 6 0 10 10 2 10 3 4 10 5 10 Frequency (Hz) Frequency (Hz) Fig. 11 Input Ripple Rejection Fig. 12 Input Ripple Rejection 10 6 6 AIC1742 TYPICAL PERFORMANCE CHARACTERISTICS AIC1742-30 100 Ripple Rejection (dB) (Continued) 80 CBP=0.01µF VSHDN, 2V/Div 60 40 CBP=0.1µF COUT=2.2µF Ceramic 20 VOUT, 1V/Div IOUT=100mA 0 10 10 2 10 3 4 5 10 10 10 6 Frequency (Hz) Fig. 14 Shutdown Delay Fig. 13 Input Ripple Rejection Vin, 500mV/Div VIN=3.5~4.5V VOUT=2.5V VIN=4.5~3.5V VOUT=2.5V COUT=2.2µF Ceramic COUT=2.2µF Ceramic IOUT=60mA IOUT=60mA Vout, 20mV/Div 1) Ch 1: 2↓ 2) Ch 2: 1↓ 500 mVolt 25 us 20 mVolt 25 us Vin, 500mV/Div Vout, 20mV/Div 1) Ch 1: 2↓ 2) Ch 2: 1↓ Fig. 15 Line Transient Response 500 mVolt 100 us 20 mVolt 100 us Fig. 16 Line Transient Response Vout, 20mV/Div CH1:20mV/Div VIN=5V VOUT=2.5V VIN=5V VOUT=2.5V COUT=2.2µF Ceramic COUT=2.2µF Ceramic IOUT=0~100mA Iout=0~100mA Iout, 50mA/Div 2> 1) Ch 1: 1↓ 2) Ch 2: 20 mVolt 10 us 10 mVolt 10 us Fig. 17 Transient Response 2 2> Iout, 50mA/Div 1) Ch 1: 1↓ 2) Ch 2: 20 mVolt 10 us 10 mVolt 10 us Fig. 18 Load Transient Response 7 AIC1742 TYPICAL PERFORMANCE CHARACTERISTICS (Continued) 60 Output Noise (µV) 50 40 COUT=4.7µF Ceramic CNB=0.01µF f=10Hz to 100KHz AIC1742-33 30 AIC1742-15 20 10 0 0.1 1 10 100 Output Current (mA) Fig. 19 Output Noise RMS BLOCK DIAGRAM VIN SHDN Control Circuit 1.25V REF - Error Amp Bias Circuit + Current Limit VOUT Thermal Shutdown Disconnect Circuit GND BP PIN DESCRIPTIONS VIN PIN - GND PIN SHDN PIN - Power supply input pin. Bypass with a 1µF capacitor to GND. Ground pin. Active-Low shutdown input pin. BP PIN - Noise bypass pin. An external bypass capacitor connecting to BP pin to reduce noises at the output. VOUT PIN - Output pin. Sources up to 150 mA. 8 AIC1742 DETAILED DESCRIPTION OF TECHNICAL TERMS DROPOUT VOLTAGE (VDROP) The dropout voltage is defined as the difference between the input voltage and output voltage at which the output voltage drops 100mV. Below this value, the output voltage will fall as the input voltage reduces. It depends on the load current and junction temperature. LINE REGULATION Line regulation is the ability of the regulator to maintain a constant output voltage as the input voltage changes. The line regulation is specified as the input voltage changes from VIN = VOUT + 1V to VIN = 8V and IOUT = 1mA. LOAD REGULATION Load regulation is the ability of the regulator to maintain a constant output voltage as the load current changes. A pulsed measurement with an input voltage set to VIN = VOUT + VDROP can minimize temperature effects. The load regulation is specified by the output current ranging from 0.1mA to 150mA. QUIESCENT CURRENT (IQ) Quiescent current is the current flowing through ground pin with no output load. GROUND CURRENT (IGND) Ground current is the current flowing through the ground pin with output load. STANDBY CURRENT (ISTBY) Standby current is the current flowing into the regulator when the output is shutdown by setting V SHDN at 0V and VIN at 8 V. CURRENT LIMIT (IIL) Current limiting of AIC1742 monitors and controls the maximum output current, in case of a shorted output. It protects device from the damage resulting from any unexpected current. RIPPLE REJECTION (RR) Ripple rejection is the ability of the regulator to reduce voltage ripple, which comes from input, at output terminal. It is specified with a signal of 0.5VP-P at 1KHz frequency applying to input, output capacitor at 2.2µF as well as a noise bypass of 0.1µF. Ripple rejection, expressed in dB, is the ratio of output ripple to input. THERMAL PROTECTION Thermal sensor protects device when the junction temperature exceeds TJ= +155ºC. It signals shutdown logic, turning off pass transistor and allowing IC to cool down. After the IC’s junction temperature cools by 15ºC, the thermal sensor will turn the pass transistor back on. Thermal protection is designed to protect the device in the event of fault conditions. For a continuous operation, do not exceed the absolute maximum junction-temperature rating of TJ= 150ºC, or damage may occur to the device. 9 AIC1742 APPLICATION INFORMATION INPUT-OUTPUT CAPACITORS Linear regulators require input and output capacitors to maintain stability. Input capacitor at 1µF with 1uF aluminum electrolytic or 2.2µF ceramic output capacitor is recommended. And it should be selected within the Equivalent Series Resistance (ESR) range as shown in the figure 20,21. ESR of ceramic capacitor is lower and its electrical characteristics (capacitance and ESR) vary widely over temperature. In general, tantalum or electric output capacitor is suggested for heavy load. Normally, the output capacitor should be 1µF (aluminum electrolytic) at least and rates for operating temperature range. Note that it’s important to check selected manufactures electrical characteristics (capacitance and ESR) over temperature. NOISE BYPASS CAPACITOR 0.01µF bypass capacitor at BP pin reduces output voltage noise. And the BP pin has to connect a capacitor to GND. PMAX = (TJ − TA) (RθJB + RθBA) Where TJ-TA is the temperature difference between the die junction and the surrounding air, RθJB is the thermal resistance of the package, and RθBA is the thermal resistance through the PCB, copper traces, and other materials to the surrounding air. As a general rule, the lower temperature is, the better reliability of the device is. So the PCB mounting pad should provide maximum thermal conductivity to maintain low device temperature. GND pin performs a dual function of providing an electrical connection to ground and channeling heat away. Therefore, connecting the GND pin to ground with a large pad or ground plane would increase the power dissipation and reduce the device temperature. POWER DISSIPATION The maximum power dissipation of AIC1742 depends on the thermal resistance of its case and circuit board, the temperature difference between the die junction and ambient air, and the rate of airflow. The rate of temperature rise is greatly affected by the mounting pad configuration on the PCB, the board material, and the ambient temperature. When the IC mounting with good thermal conductivity is used, the junction temperature will be low even when large power dissipation applies. The power dissipation across the device is P = IOUT (VIN-VOUT). The maximum power dissipation is: 10 100 100 10 10 COUT ESR (Ω) Serial Resistor (Ω) AIC1742 COUT=1µF Stable Region 0.1 COUT=4.7µF 1 COUT=2.2µF Stable Region 0.1 0.01 0.01 0 20 40 60 80 100 120 0 140 Load Current (mA) Fig. 20 Stable Region with extra Serial Resistor vs. Load Current 20 40 60 80 100 120 140 Load Current (mA) Fig. 21 Region of Stable COUT ESR vs. Load Current PHYSICAL DIMENSIONS SOT-23-5 (unit: mm) D e e1 SEE VIEW B WITH PLATING MIN. MAX. A 0.95 1.45 A1 0.05 0.15 A2 0.90 1.30 b 0.30 0.50 c 0.08 0.22 3.00 D 2.80 E 2.60 3.00 E1 1.50 1.70 e 0.95 BSC e1 1.90 BSC c A A2 b BASE METAL SECTION A-A A1 L 0.30 L1 θ 0.60 0.60 REF 0° 8° 0.25 A SOT-25 MILLIMETERS GAUGE PLANE SEATING PLANE L L1 VIEW B θ A E E1 S Y M B O L 11 AIC1742 Note: Information provided by AIC is believed to be accurate and reliable. However, we cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in an AIC product; nor for any infringement of patents or other rights of third parties that may result from its use. We reserve the right to change the circuitry and specifications without notice. Life Support Policy: AIC does not authorize any AIC product for use in life support devices and/or systems. Life support devices or systems are devices or systems which, (I) are intended for surgical implant into the body or (ii) support or sustain life, and 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 to the user. 12