UNISONIC TECHNOLOGIES CO., LTD LD1985 LINEAR INTEGRATED CIRCUIT VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR LOW ESR CAP. COMPATIBLE, WITH INHIBIT FUNCTION 3 DESCRIPTION The UTC LD1985 is a 150mA fixed output voltage regulator with ultra low drop voltage and the low quiescent current. It is specially designed for low noise, low power applications and in battery powered systems, such as Cell phones, palmtop laptop computer, PDAs, DSC. The quiescent current in sleep mode is less than 1µA when INHIBIT pin is pulled low. Due to Shutdown Logic Control Function is available on pin 3 (TTL compatible), when the device is used as local regulator, it is possible to put a part of the board in standby, decreasing the total power consumption Besides, an external capacitor, CBYP=10nF, connected between bypass pin and GND could reduce the noise to 30µVrms. 2 1 4 5 SOT-25 *Pb-free plating product number: LD1985L FEATURES *Very low dropout voltage (280mV at 150mA and 7mV at 1mA load) *Very low quiescent current (2mA typ. at 150mA load and 80µA at no load) *Output current up to 150mA *Logic controlled electronic shutdown *Output voltage of 1.5, 1.8, 2.5, 2.8, 2.85, 3, 3.1, 3.2, 3.3, 3.5, 3.6, 3.8, 4, 4.7, 5.0V *Internal current and thermal limit *± 1% tolerance version is available.(at 25℃) *Low output noise voltage 30µVrms ORDERING INFORMATION Order Number Package Normal Lead Free Plating LD1985-xx-AF5-R LD1985L-xx-AF5-R SOT-25 Note: xx: Output Voltage, refer to Marking Information. Packing Tape Reel LD1985L-xx-AF5-R (1)Packing Type (2)Package Type (1) R: Tape Reel (2) AF5: SOT-25 (3)Output Voltage Code (4)Lead Plating (3) xx: refer to Marking Information (4) L: Lead Free Plating, Blank: Pb/Sn www.unisonic.com.tw Copyright © 2005 Unisonic Technologies Co., Ltd 1 of 10 QW-R102-021,C LD1985 LINEAR INTEGRATED CIRCUIT MARKING INFORMATION PACKAGE SOT-25 VOLTAGE CODE 15:1.5V 18:1.8V 25:2.5V 28:2.8V 2J:2.85V 30:3.0V 31:3.1V 32:3.2V 33:3.3V 35:3.5V 36:3.6V 38:3.8V 40:4.0V 47:4.7V 50:5.0V MARKING 3 2 1 Lead Plating LD Voltage Code 4 5 PIN DESCRIPTION PIN NO. 1 2 PIN NAME VIN GND 3 INHIBIT 4 Bypass 5 VOUT FUNCTION Input Ground Control switch ON/OFF. Inhibit is not internally pulled-up; it cannot be left floating. Disable the device when connected to GND or to a positive voltage less than 0.18V Bypass Pin: Capacitor to be connected to GND in order to improve the thermal noise performances. Output THERMAL DATA PARAMETER Thermal Resistance Junction-Case UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw SYMBOL θJC RATINGS 81 UNIT ℃/W 2 of 10 QW-R102-021,C LD1985 LINEAR INTEGRATED CIRCUIT BLOCK DIAGRAM V OUT VIN CURRENT LIMIT SHDN START-UP SHUTDOWN REFERENCE VOLTAGE ERROR AMPLIFIER DRIVER BYPASS TERM. PROTEC. GND UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 3 of 10 QW-R102-021,C LD1985 ABSOLUTE MAXIMUM RATINGS LINEAR INTEGRATED CIRCUIT (Ta=25℃) PARAMETER SYMBOL RATINGS UNIT DC Input Voltage VIN 7 V INHIBIT Input Voltage VINH 7 V Output Current IOUT Internally limited Power Dissipation PD Internally limited Operating Junction Temperature TOPR -20~+125 ℃ Storage Temperature TSTG -40~+150 ℃ Note 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. 2. The device is guaranteed to meet performance specification within 0℃~+70℃ operating temperature range and assured by design from -20℃~+125℃ ELECTRICAL CHARACTRISTICS (TJ=25℃, VIN=VOUT+1V, IOUT=1mA, VSHDN=2V, CIN=1µF, COUT=1µF, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Operating Input Voltage VIN(OPR) 2.5 7.0 V 1.0% 1.485 1.515 VIN=2.5V 1.5 V 1.5% 1.477 1.523 1.0% 1.462 1.538 IOUT=1 ~ 150mA V Output Voltage VOUT 1.5% 1.455 1.545 1.0% 1.447 1.553 IOUT =1 ~ 150mA, TJ=-20 ~ 125℃ V 1.5% 1.440 1.560 1.0% 1.782 1.818 VIN=2.8V 1.8 V 1.5% 1.773 1.827 1.0% 1.755 1.845 Output Voltage VOUT IOUT=1 ~ 150mA V 1.5% 1.746 1.854 1.0% 1.737 1.863 IOUT =1 ~ 150mA, TJ=-20 ~ 125℃ V 1.5% 1.728 1.872 1.0% 2.475 2.525 VIN=3.5V 2.5 V 1.5% 2.4625 2.5375 1.0% 2.4375 2.5625 Output Voltage VOUT IOUT=1 ~ 150mA V 1.5% 2.425 2.575 1.0% 2.4125 2.5875 IOUT =1 ~ 150mA, TJ=-20 ~ 125℃ V 1.5% 2.4 2.6 1.0% 2.772 2.828 VIN=3.8V 2.8 V 1.5% 2.758 2.842 1.0% 2.730 2.870 Output Voltage VOUT IOUT=1 ~ 150mA V 1.5% 2.716 2.884 1.0% 2.702 2.898 IOUT =1 ~ 150mA, TJ=-20 ~ 125℃ V 1.5% 2.688 2.912 1.0% 2.821 2.879 VIN=3.85V 2.85 V 1.5% 2.807 2.893 1.0% 2.778 2.921 Output Voltage VOUT IOUT=1 ~ 150mA V 1.5% 2.764 2.935 1.0% 2.750 2.950 IOUT =1 ~ 150mA, TJ=-20 ~ 125℃ V 1.5% 2.736 2.964 1.0% 2.970 3.030 VIN=4.0V 3.0 V 1.5% 2.955 3.045 1.0% 2.925 3.075 Output Voltage VOUT IOUT=1 ~ 150mA V 1.5% 2.91 3.09 1.0% 2.895 3.105 IOUT =1 ~ 150mA, TJ=-20 ~ 125℃ V 1.5% 2.88 3.12 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 4 of 10 QW-R102-021,C LD1985 LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTRISTICS(Cont.) PARAMETER SYMBOL TEST CONDITIONS VIN=4.1V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125℃ VIN=4.2V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125℃ VIN=4.3V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125℃ VIN=4.5V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125℃ VIN=4.6V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125℃ VIN=4.8V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125℃ VIN=5.0V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125℃ VIN=5.7V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125℃ UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% MIN 3.069 3.0535 3.022 3.007 2.9915 2.976 3.168 3.152 3.120 3.104 3.088 3.072 3.267 3.2505 3.2175 3.201 3.1845 3.168 3.465 3.447 3.412 3.395 3.377 3.360 3.564 3.546 3.510 3.492 3.474 3.456 3.762 3.743 3.705 3.686 3.667 3.648 3.96 3.94 3.9 3.88 3.86 3.84 4.653 4.6295 4.582 4.559 4.5355 4.512 TYP 3.1 3.2 3.3 3.5 3.6 3.8 4.0 4.7 MAX UNIT 3.131 V 3.1465 3.1775 V 3.193 3.2085 V 3.224 3.232 V 3.248 3.280 V 3.296 3.312 V 3.328 3.333 V 3.3495 3.3825 V 3.399 3.4155 V 3.432 3.535 V 3.552 3.587 V 3.605 3.622 V 3.640 3.636 V 3.654 3.690 V 3.708 3.726 V 3.744 3.838 V 3.857 3.895 V 3.914 3.933 V 3.952 4.04 V 4.06 4.1 V 4.12 4.14 V 4.16 4.747 V 4.7705 4.817 V 4.841 4.8645 V 4.888 5 of 10 QW-R102-021,C LD1985 LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTRISTICS(Cont.) PARAMETER SYMBOL TEST CONDITIONS VIN=6.0V Output Voltage VOUT IOUT=1 ~ 150mA IOUT =1 ~ 150mA, TJ=-20 ~ 125℃ Short Circuit Current Line Regulation Dropout Voltage Quiescent Current Supply Voltage Rejection Control Input Logic Low Control Input Logic High 1.0% 1.5% 1.0% 1.5% 1.0% 1.5% MIN 4.95 4.925 4.875 4.85 4.825 4.8 Isc RL=0 VIN =Vo+1V ~ 7V, IOUT =1mA △Vo/△VI VIN =Vo+1V ~ 7V, IOUT =1mA, TJ=-20 ~ 125℃ VD IQ SVR VIL VIH Control Input Current IINH Output Noise Voltage eN 5.0 400 0.003 IOUT =0 IOUT =0, TJ=-20 ~ 125℃ 1 IOUT =1mA IOUT =1mA, TJ=-20 ~ 125℃ 7 IOUT =10mA IOUT =10mA, TJ=-20 ~ 125℃ 40 IOUT =50mA IOUT =50mA, TJ=-20 ~ 125℃ 120 IOUT =150mA IOUT =150mA, TJ=-20 ~ 125℃ 280 IOUT =0 IOUT =0, TJ=-20 ~ 125℃ 80 IOUT =1mA IOUT =1mA, TJ=-20 ~ 125℃ 100 IOUT =10mA IOUT =10mA, TJ=-20 ~ 125℃ 200 IOUT =50mA IOUT =50mA, TJ=-20 ~ 125℃ 600 IOUT =150mA IOUT =150mA, TJ=-20 ~ 125℃ 2000 OFF mode VINH<0.18V OFF mode VINH<0.18V, TJ=-20 ~ 125℃ 0 CBYP=0.01µF, Co=10µF, f=1KHz TJ=-20 ~ 125℃ TJ=-20 ~ 125℃ TJ=-20 ~ 125℃, VSHDN=5V TJ=-20 ~ 125℃, VSHDN=0V 45 B=300Hz ~ 50KHz, CBYP=0.01µF, Co=10µF UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw TYP 2 5 0 30 MAX 5.05 5.075 5.125 5.15 5.175 5.2 UNIT V V V mA 0.014 %/VIN 0.032 %/ VIN 3 mV 5 mV 10 mV 15 mV 60 mV 90 mV 150 mV 225 mV 350 mV 575 mV 100 µA 150 µA 150 µA 200 µA 300 µA 400 µA 900 µA 1200 µA 3000 µA 4000 µA µA 2 µA dB 0.15 V V 15 µA -1 µA µV 6 of 10 QW-R102-021,C LD1985 LINEAR INTEGRATED CIRCUIT APPLICATION INFORMATION EXTERNAL CAPACITORS An external capacitor for regulator stability is required. This capacitor must be selected to meet the requirements of minimum capacitance and equivalent series resistance. It is recommended to solder input and output capacitors as close as possible to the relative pins. INPUT CAPACITOR A 1µF input capacitor (ceramic, tantalum or film capacitors can be used) is required with the UTC LD1985 (amount of capacitance can be increased without limit). This capacitor must be located a distance less than 0.5" from the input pin of the device and returned to a clean analog ground. OUTPUT CAPACITOR The output capacitor must meet both the requirement for minimum amount of capacitance and E.S.R. (equivalent series resistance) value. The output capacitor must maintain its ESR in the stable region over the full operating temperature to assure stability. Also, capacitor tolerance and variation with temperature must be considered to assure the minimum amount of capacitance is provided over time. Due to the different loop gain and the stability improves for higher output versions, if low E.S.R. ceramic type is used, the recommended minimum output capacitor value are is 1µF for output voltages equal or major than 3.8V, 2.2µF for VOUT going from 1.8~3.3V, and 3.3µF for the other versions. However, if an output capacitor lower than the suggestion, it's possible to make stable the regulator adding a resistor in series to the capacitor. This capacitor should be located not more than 0.5" from the output pin of the device and returned to a clean analog ground. INHIBIT INPUT OPERATION The inhibit pin can be used to turn OFF the regulator when pulled low, so drastically reducing the current consumption down to less than 1µA. When the inhibit feature is not used, this pin must be tied to VIN to keep the regulator output ON over time. To assure proper operation, the signal source used to drive the inhibit pin must be able to swing above and below the specified thresholds listed in the electrical characteristics section under VIH, VIL. Any slew rate can be used to drive the inhibit. REVERSE CURRENT The power transistor used in the UTC LD1985 has not an inherent diode connected between the regulator input and output. If the output is forced above the input, no current will flow from the output to the input across the series pass transistor. When a VREV voltage is applied on the output, the reverse current measured flows to the GND across the two feedback resistors. This current typical value is 160µA. R1 and R2 resistors are implanted type; and typical values are respectively 42.6 KΩ and 51.15 KΩ. Bypass VIN + OUT IN + 1μF A VREV 4.7μF R1 R2 INH VIN GND 1 VINH 2 Fig 1. REVERSE CURRENT TEST CIRCUIT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 10 QW-R102-021,C LD1985 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS(TJ=25℃, CIN=1µF, COUT=2.2µF, CBYP=100nF, unless otherwise specified) Output Voltage vs Temperature 2.60 Quiescent Current vs Load Current VIN=3.5V IOUT=1mA 2.58 V OUT=2.5V Cby=10nF 2000 2.56 1600 2.52 IQ (μA) VOUT (V) 2.54 2.50 2.48 1200 800 2.46 2.44 400 2.42 2.40 -50 -25 0 50 25 Tc (℃) 75 100 0 125 0 25 Dropout Voltage vs Temperature 50 100 75 IoUT (mA) 125 150 175 Quiescent Current vs Temperature 0.4 VOUT=2.5V Cby=10nF VOUT=2.5V Cby =10nF 3.5 IOUT=150mA IOUT=150mA 3.0 0.3 0.2 IQ (mA) VD (V) 2.5 IOUT=50mA 2.0 1.5 1.0 0.1 IOUT=10mA 0.5 IOUT=1mA 0 -50 -25 0 50 25 Tc (℃) 75 100 0 -50 125 -25 0 25 50 Tc (℃) 75 90 250 fosc=1KHz VIN=3.5 ~ 6.5V IoUT=10mA 80 SVR (dB) 200 VD (mV) 125 Supply Voltage Rejection vs Temperature Dropout Voltage vs Output Current 150 CoUT=10μF 70 CoUT=1μF 60 50 100 40 VOUT=2.5V 50 0 100 30 0 25 50 75 100 125 150 175 IoUT (mA) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 20 -50 -25 0 25 50 75 100 125 Tc (℃) 8 of 10 QW-R102-021,C LD1985 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS(Cont.) Supply Voltage Rejection vs Output Current Supply Voltage Rejection vs Frequency 80 100 70 60 60 SVR (dB) SVR (dB) 80 40 40 30 20 20 0 50 VIN=3.5 ~ 6.5V COUT=10μF fosc=1KHz 0 25 50 10 100 75 IOUT (mA) 150 125 VIN=3.5 ~ 6.5V IOUT=10mA VOUT=2.5V COUT=1μF 0 1 10 175 2 10 f (KHz) 4 10 5 10 Line Transient Supply Voltage Rejection vs Output Current 100 3 10 Tek Run:5.00MS/s SVR (dB) 80 60 VIN 1 40 1 20 0 VOUT VIN=3.5 ~ 6.5V C OUT=1μF fosc=1KHz 0 25 50 100 75 150 125 Ch1 500mV Ch2 CH2 20.0mV M 10.0μs Ch1 175 3.96V V OUT=2.5V, IOUT=50mA, no CIN, COUT=4.7μF, tr =tf=20ns IOUT (mA) Line Transient Supply Voltage Rejection vs Frequency 70 Tek Run:5.00MS/s SVR (dB) 60 VIN 50 1 40 30 VOUT 20 10 2 VIN=2.8 ~ 5.8V IOUT=10mA VOUT=1.8V COUT=10μF 0 101 102 103 4 10 5 10 f (KHz) UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw CH2 20.0mV M 10.0μs Ch1 Ch1 500mV Ch2 3.96V VOUT=2.5V, IOUT=50mA, no CIN, COUT=4.7μF, tr =tf=1μs 9 of 10 QW-R102-021,C LD1985 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS(Cont.) Load Transient Load Transient Tek Run: 5.00MS/s Tek Run: 5.00MS/s 2 Iout 2 1 3 Vout Vout Ch3 20.0mV Ch2 50.0mVΩ M 10.0μs Ch2 29mV VOUT=2.5V, IOUT=0~50mA, no CIN, COUT=10μF, ts=tf=2ns Ch1 50.0mV Ch2 CH2 100mVΩ M 10.0μs Ch2 78mV VOUT=2.5V, IOUT=50mA, no CIN, COUT=4.7μF, ts=tf=20ns UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 10 of 10 QW-R102-021,C