UTC LD1985 LINEAR INTEGRATED CIRCUIT VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR LOW ESR CAP. COMPATIBLE, WITH INHIBIT FUNCTION 2 DESCRIPTION 3 The UTC LD1985 is a 150mA fixed output voltage regulator. The ultra low drop voltage and the low quiescent current make them particularly suitable for low noise, low power applications, and in battery powered systems. In sleep mode quiescent current is less than 1μA when INHIBIT pin is pulled low. Shutdown Logic Control Function is available on pin 3 (TTL compatible). This means that 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. An external capacitor, CBYP=10nF, connected between bypass pin and GND reduce the noise to 30μVrms. Typical application are in cellular phone, palmtop laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera. 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, 5V *INTERNAL CURRENT AND THERMAL LIMIT *AVAILABLE IN ± 1% TOLLERANCE (at 25℃, A VERSION) *LOW OUTPUT NOISE VOLTAGE 30μVrms 5 4 SOT-25 1:VIN 4:Bypass 2:GND 5:VOUT 3:INHIBIT PIN DESCRIPTION PIN NO. PIN NAME 1 2 IN GND 3 4 5 UTC 1 FUNCTION Input Port Ground Pin Control switch ON/OFF. Inhibit is not internally pulled-up; it cannot be left INHIBIT 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 Bypass order to improve the thermal noise performances. OUT Output Port UNISONIC TECHNOLOGIES CO., LTD. 1 QW-R102-021,B UTC LD1985 LINEAR INTEGRATED CIRCUIT MARKING INFORMATION PART NUMBER VOLTAGE VOLTAGE CODE LD1985-1.5V LD1985-1.8V LD1985-2.5V LD1985-2.8V LD1985-2.85V LD1985-3.0V LD1985-3.1V LD1985-3.2V 1.5V 1.8V 2.5V 2.8V 2.85V 3.0V 3.1V 3.2V 15 18 25 28 2J 30 31 32 PART NUMBER LD1985-3.3V LD1985-3.5V LD1985-3.6V LD1985-3.8V LD1985-4.0V LD1985-4.7V LD1985-5.0V VOLTAGE VOLTAGE CODE 3.3V 3.5V 3.6V 3.8V 4.0V 4.7V 5.0V 33 35 36 38 40 47 50 MARKING 3 2 1 LD 4 VOLTAGE CODE 5 BLOCK DIAGRAM Vout Vin CURRENT LIMIT START-UP SHUTDOWN SHDN REFERENCE VOLTAGE ERROR AMPLIFIER DRIVER BYPASS TERM. PROTEC. GND ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL RATINGS UNIT DC Input Voltage INHIBIT Input Voltage Output Current Power Dissipation Storage Temperature Range Operating Junction Temperature Range Vi VINH Io Ptot Tstg Top 7 7 Internally limited Internally limited -65 ~ +150 -40 ~ +125 V V ℃ ℃ SYMBOL RATINGS UNIT Rthj-case 81 ℃/W THERMAL DATA PARAMETER Thermal Resistance Junction-case UTC UNISONIC TECHNOLOGIES CO., LTD. 2 QW-R102-021,B UTC LD1985 LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTERISTICS FOR LD1985 VO±1.0% (TJ=25℃, Vi=Vo+1V, Io=1mA, VSHDN=2V, Ci=1μF, Co=1μF, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS Operating Input Voltage Output Voltage Vop Vo Output Voltage Vo Vi=2.8V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=3.5V Vi=2.5V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=3.8V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=3.85V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=4.0V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=4.1V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=4.2V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=4.3V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=4.5V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=4.6V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=4.8V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=5.0V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=5.7V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=6.0V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ UTC MIN 2.5 1.485 1.462 1.447 1.782 1.755 1.737 2.475 2.4375 2.4125 2.772 2.730 2.702 2.821 2.778 2.750 2.970 2.925 2.895 3.069 3.022 2.9915 3.168 3.120 3.088 3.267 3.2175 3.1845 3.465 3.412 3.377 3.564 3.510 3.474 3.762 3.705 3.667 3.96 3.9 3.86 4.653 4.582 4.5355 4.95 4.875 4.825 TYP 1.5 1.8 2.5 2.8 2.85 3.0 3.1 3.2 3.3 3.5 3.6 3.8 4 4.7 5 MAX UNIT 7 1.515 1.538 1.553 1.818 1.845 1.863 2.525 V V V V V V V V 2.5625 2.5875 2.828 2.870 2.898 2.879 2.921 2.950 3.030 3.075 3.105 3.131 3.1775 3.2085 3.232 3.280 3.312 3.333 3.3825 3.4155 3.535 3.587 3.622 3.636 3.690 3.726 3.838 3.895 3.933 4.04 4.1 4.14 4.747 4.817 4.8645 5.05 5.125 5.175 V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V UNISONIC TECHNOLOGIES CO., LTD. 3 QW-R102-021,B UTC LD1985 PARAMETER LINEAR INTEGRATED CIRCUIT SYMBOL Short Circuit Current Line Regulation Isc △Vo/△Vi TEST CONDITIONS MIN RL=0 Vi=Vo+1V ~ 16V, Io=1mA TYP MAX UNIT 400 0.003 0.014 mA %/Vi 0.032 Vi=Vo+1V ~ 16V, Io=1mA TJ=-40 ~ 125℃ Dropout Voltage Vd Quiescent Current Id Supply Voltage Rejection Control Input Logic Low Control Input Logic High Control Input Current Output Noise Voltage UTC SVR VIL VIH IiNH eN Io=0 TJ=-40 ~ 125℃, Io=0 1 Io=1mA Io=1mA, TJ=-40 ~ 125℃ 7 Io=10mA Io=10mA, TJ=-40 ~ 125℃ 40 Io=50mA Io=50mA, TJ=-40 ~ 125℃ 120 Io=150mA Io=150mA, TJ=-40 ~ 125℃ 280 Io=0 TJ=-40 ~ 125℃, Io=0 80 Io=1mA Io=1mA, TJ=-40 ~ 125℃ 100 Io=10mA Io=10mA, TJ=-40 ~ 125℃ 200 Io=50mA Io=50mA, TJ=-40 ~ 125℃ 600 Io=150mA Io=150mA, TJ=-40 ~ 125℃ 2000 OFF MODE VINH<0.18V OFF MODE VINH<0.18V TJ=-40 ~ 125℃ CBYP=0.01μF, Co=10μF, f=1KHz TJ=-40 ~ 125℃ TJ=-40 ~ 125℃ TJ=-40 ~ 125℃, VSHDN=5V TJ=-40 ~ 125℃, VSHDN=0V B=300Hz ~ 50KHz CBYP=0.01μF, Co=10μF 3 mV 5 10 15 60 90 150 225 350 575 100 150 150 200 300 400 900 1200 3000 4000 mV mV mV mV mV mV mV mV mV μA μA μA μA μA μA μA μA μA μA μA 0 2 45 0.15 2 5 0 30 %/Vi 15 -1 μA dB V V μA μA μV UNISONIC TECHNOLOGIES CO., LTD. 4 QW-R102-021,B UTC LD1985 LINEAR INTEGRATED CIRCUIT ELECTRICAL CHARACTERISTICS FOR LD1985 VO±1.5% (TJ=25℃, Vi=Vo+1V, Io=1mA, VSHDN=2V, Ci=1μF, Co=1μF, unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS MIN Output Voltage Vo Vi=3.8V Io=1 ~ 150mA 2.5 1.477 1.455 1.440 1.773 1.746 1.728 2.4625 2.425 2.4 2.758 2.716 Io=1 ~ 150mA, TJ=-40 ~ 125℃ 2.688 Output Voltage Vo Vi=3.85V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=4.0V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=4.1V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=4.2V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=4.3V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=4.5V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=4.6V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=4.8V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=5.0V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=5.7V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Vo Vi=6.0V Io=1 ~ 150mA 2.807 2.764 2.736 2.955 2.91 2.88 3.0535 3.007 2.976 3.152 3.104 3.072 3.2505 3.201 3.168 3.447 3.395 3.360 3.546 3.492 3.456 3.743 3.686 3.648 3.94 3.88 3.84 4.6295 4.559 4.512 4.925 4.85 Operating Input Voltage Output Voltage Vop Vo Vi=2.5V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Vo Vi=2.8V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Vo Vi=3.5V Io=1 ~ 150mA Io=1 ~ 150mA, TJ=-40 ~ 125℃ Output Voltage Output Voltage UTC TYP 1.5 1.8 2.5 2.8 2.85 3.0 3.1 3.2 3.3 3.5 3.6 3.8 4 4.7 5 MAX UNIT 7 1.523 1.545 1.560 1.827 1.854 1.872 2.5375 2.575 2.6 2.842 2.884 V V V V V V V V V V V V 2.912 V 2.893 2.935 2.964 3.045 3.09 3.12 3.1465 3.193 3.224 3.248 3.296 3.328 3.3495 3.399 3.432 3.552 3.605 3.640 3.654 3.708 3.744 3.857 3.914 3.952 4.06 4.12 4.16 4.7705 4.841 4.888 5.075 5.15 V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V V UNISONIC TECHNOLOGIES CO., LTD. 5 QW-R102-021,B UTC LD1985 LINEAR INTEGRATED CIRCUIT Io=1 ~ 150mA, TJ=-40 ~ 125℃ PARAMETER SYMBOL Short Circuit Current Line Regulation Isc △Vo/△Vi Dropout Voltage Vd Quiescent Current Id Supply Voltage Rejection Control Input Logic Low Control Input Logic High Control Input Current Output Noise Voltage UTC SVR VIL VIH IiNH eN TEST CONDITIONS 4.8 MIN RL=0 Vi=Vo+1V ~ 16V, Io=1mA Vi=Vo+1V ~ 16V, Io=1mA TJ=-40 ~ 125℃ TYP 400 0.03 Io=0 TJ=-40 ~ 125℃, Io=0 1 Io=1mA Io=1mA, TJ=-40 ~ 125℃ 7 Io=10mA Io=10mA, TJ=-40 ~ 125℃ 40 Io=50mA Io=50mA, TJ=-40 ~ 125℃ 120 Io=150mA Io=150mA, TJ=-40 ~ 125℃ 280 Io=0 TJ=-40 ~ 125℃, Io=0 80 Io=1mA Io=1mA, TJ=-40 ~ 125℃ 100 Io=10mA Io=10mA, TJ=-40 ~ 125℃ 200 Io=50mA Io=50mA, TJ=-40 ~ 125℃ 600 Io=150mA Io=150mA, TJ=-40 ~ 125℃ 2000 OFF MODE VINH<0.18V OFF MODE VINH<0.18V TJ=-40 ~ 125℃ CBYP=0.01μF, Co=10μF, f=1KHz TJ=-40 ~ 125℃ TJ=-40 ~ 125℃ TJ=-40 ~ 125℃, VSHDN=5V TJ=-40 ~ 125℃, VSHDN=0V B=300Hz ~ 50KHz CBYP=0.01μF, Co=10μF 5.2 V MAX UNIT 0.014 0.032 3 5 10 15 60 90 150 225 350 575 100 150 150 200 300 400 900 1200 3000 4000 0 2 45 0.15 2 5 0 30 15 -1 mA %/Vi %/Vi mV mV mV mV mV mV mV mV mV mV μA μA μA μA μA μA μA μA μA μA μA μA dB V V μA μA μV UNISONIC TECHNOLOGIES CO., LTD. 6 QW-R102-021,B UTC LD1985 LINEAR INTEGRATED CIRCUIT TYPICAL CHARACTERISTICS (TJ=25℃, Ci=1μF, Co=2.2μF, CBYP=100nF, unless otherwise specified) UTC UNISONIC TECHNOLOGIES CO., LTD. 7 QW-R102-021,B UTC LD1985 LINEAR INTEGRATED CIRCUIT Output Voltage vs Temperature 2.60 Quiescent Current vs Load Current Vi=3.5V Io=1mA 2.58 Vo=2.5V Cby=10nF 2000 2.56 Iq (μA) Vo (V) 2.54 2.52 2.50 1600 1200 2.48 800 2.46 2.44 400 2.42 2.40 -50 -25 0 50 25 Tc (℃) 100 75 0 125 0 25 Dropout Voltage vs Temperature 50 100 75 Io (mA) 125 150 175 Quiescent Current vs Temperature 0.4 Vo=2.5V Cby=10nF Io=150mA Io=150mA 3.0 0.2 Iq (mA) 0.3 Vd (V) Vo=2.5V Cby=10nF 3.5 Io=50mA 2.5 2.0 1.5 0.1 1.0 Io=10mA 0.5 Io=1mA 0 -50 0 -25 50 25 Tc (℃) 75 100 0 -50 125 -25 0 25 50 Tc (℃) 75 90 250 fosc =1KHz Vi=3.5 ~ 6.5V Io=10mA 80 200 SVR (dB) Vd (mV) 125 Supply Voltage Rejection vs Temperature Dropout Voltage vs Output Current 150 Co=10µ F 70 Co=1µ F 60 50 100 40 Vo=2.5V 50 0 100 30 0 25 UTC 50 75 100 Io (mA) 125 150 175 20 -50 -25 0 25 50 Tc (℃) 75 100 UNISONIC TECHNOLOGIES CO., LTD. 125 8 QW-R102-021,B UTC LD1985 LINEAR INTEGRATED CIRCUIT Supply Voltage Rejection vs Output Current Supply Voltage Rejection vs Frequency 100 80 70 80 50 60 SVR (dB) SVR (dB) 60 40 40 30 20 20 0 Vi=3.5 ~ 6.5V Co=10µ F fosc=1KHz 0 25 50 10 100 75 Io (mA) 150 125 0 1 10 175 Supply Voltage Rejection vs Output Current Vi=3.5 ~ 6.5V Io=10mA Vo=2.5V Co=1µ F 2 10 3 10 f (KHz) Line Transient Tek Run:5.00MS/s Average ? T 100 10 4 10 5 ? SVR (dB) 80 60 1 40 1 20 0 25 50 Vout Ch1 500mV Ch2 CH2 20.0mV M 10.0μs Ch1 Vi=3.5 ~ 6.5V Co=1µ F fosc=1KHz 0 Vin 3.96V Vo=2.5V, Io=50mA, no C i, Co=4.7µ F, tr=tf=20ns 100 75 Io (mA) 150 125 175 Supply Voltage Rejection vs Frequency Line Transient Tek Run:5.00MS/s Average ? T 70 ? SVR (dB) 60 Vin 50 1 40 30 20 10 2 Vi=2.8 ~ 5.8V Io=10mA Vo=1.8V Co=10µ F 0 1 10 2 10 Vout Ch1 500mV Ch2 CH2 20.0mV M 10.0µ s Ch1 3.96V Vo=2.5V, Io=50mA, no C i, Co=4.7μF, tr=tf=1μs 10 3 10 4 5 10 f (KHz) UTC UNISONIC TECHNOLOGIES CO., LTD. 9 QW-R102-021,B UTC LD1985 LINEAR INTEGRATED CIRCUIT Load Transient Tek Run: 5.00MS/s Average ? T Load Transient Tek Run: 5.00MS/s Average ? ? T ? 2 Iout 2 1 3 Vout Vout Ch3 20.0mV Ch2 50.0mVΩ M 10.0μs Ch2 29mV Vo=2.5V, Io=0 ~ 50mA, no C i, Co=10µ F, ts=tf=2ns Ch1 50.0mV Ch2 CH2 100mVΩ M 10.0μs Ch2 78mV Vo=2.5V, Io=50mA, no C i, Co=4.7µ F, ts=tf=20ns APPLICATION INFORMATION EXTERNAL CAPACITORS Like any low-dropout regulator, the UTC LD1985 requires external capacitors for regulator stability. This capacitor must be selected to meet the requirements of minimum capacitance and equivalent series resistance. We suggest to solder input and output capacitors as close as possible to the relative pins. INPUT CAPACITOR An input capacitor whose value is 1μF is required with the UTC LD1985 (amount of capacitance can be increased without limit). This capacitor must be located a distance of not more than 0.5" from the input pin of the device and returned to a clean analog ground. Any good quality ceramic, tantalum or film capacitors can be used for this capacitor. OUTPUT CAPACITOR The UTC LD1985 is designed specifically to work with ceramic output capacitors. It may also be possible to use Tantalum capacitors, but these are not as attractive for reasons of size and cost. By the way, the output capacitor must meet both the requirement for minimum amount of capacitance and E.S.R. (equivalent series resistance) value. Due to the different loop gain, the stability improves for higher output versions and so the suggested minimum output capacitor value, if low E.S.R. ceramic type is used, is 1μF for output voltages equal or major than 3.8V, 2.2μF for VO going from 1.8 ~ 3.3V, and 3.3μF for the other versions. However, if an output capacitor lower than the suggested one is used, it's possible to make stable the regulator adding a resistor in series to the capacitor. IMPORTANT: 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 at all times. 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 Vi to keep the regulator output ON at all times. 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; UTC UNISONIC TECHNOLOGIES CO., LTD. 10 QW-R102-021,B UTC LD1985 LINEAR INTEGRATED CIRCUIT Typical values are, respectively, 42.6 KΩ and 51.150 KΩ. Reverse Current Test Circuit Bypass Vi + OUT IN + 1μF A VREV 4.7μF R1 R2 INH Vi GND 1 VINH 2 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. UTC UNISONIC TECHNOLOGIES CO., LTD. 11 QW-R102-021,B