LD2985 SERIES VERY LOW DROP AND LOW NOISE VOLTAGE REGULATOR LOW ESR CAP. COMPATIBLE, WITH INHIBIT FUNCTION ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ 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°C, A VERSION) LOW OUTPUT NOISE VOLTAGE 30µVrms SMALLEST PACKAGE SOT23-5L TEMPERATURE RANGE: -40°C TO 125°C DESCRIPTION The LD2985 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 SOT23-5L 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. SCHEMATIC DIAGRAM July 2003 1/13 LD2985 SERIES ABSOLUTE MAXIMUM RATINGS Symbol VI VINH Parameter Value Unit DC Input Voltage 16 V INHIBIT Input Voltage 16 V Output Current Internally limited Ptot Power Dissipation Internally limited Tstg Storage Temperature Range -65 to +150 °C Top Operating Junction Temperature Range -40 to +125 °C IO Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied. THERMAL DATA Symbol Rthj-case Parameter Thermal Resistance Junction-case CONNECTION DIAGRAM (top view) SOT23-5L Unit 81 °C/W PIN DESCRIPTION Pin N° Symbol 1 2 3 4 SOT23-5L 5 Name and Function IN Input Port GND Ground Pin INHIBIT 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 Bypass Pin: Capacitor to be connected to GND in order to improve the thermal noise performances. OUT Output Port ORDERING CODES 2/13 A VERSION B VERSION OUTPUT VOLTAGES LD2985AM15R LD2985AM18R LD2985AM25R LD2985AM28R LD2985AM285R LD2985AM30R LD2985AM31R LD2985AM32R LD2985AM33R LD2985AM35R LD2985AM36R LD2985AM38R LD2985AM40R LD2985AM47R LD2985AM50R LD2985BM15R LD2985BM18R LD2985BM25R LD2985BM28R LD2985BM285R LD2985BM30R LD2985BM31R LD2985BM32R LD2985BM33R LD2985BM35R LD2985BM36R LD2985BM38R LD2985BM40R LD2985BM47R LD2985BM50R 1.5V 1.8V 2.5V 2.8V 2.85V 3.0V 3.1V 3.2V 3.3V 3.5V 3.6V 3.8V 4.0V 4.7V 5.0V LD2985 SERIES ELECTRICAL CHARACTERISTICS FOR LD2985A (TJ = 25°C, VI=VO+1V, IO=1mA, VSHDN=2V, CI = 1µF, CO = 1µF, unless otherwise specified) Symbol Parameter VOp Operating Input Voltage VO Output Voltage Test Conditions IO = 1 to 50mA Output Voltage 1.485 TJ= -40 to 125°C VI = 2.8V IO = 1 to 150mA Output Voltage TJ= -40 to 125°C VI = 3.5V IO = 1 to 150mA Output Voltage Output Voltage Output Voltage Output Voltage Output Voltage Output Voltage Output Voltage V 2.4375 2.5625 V 2.4125 2.5875 V VI = 3.85V 2.821 IO = 1 to 50mA 2.778 TJ= -40 to 125°C 2.8 2.85 2.750 V V 2.950 V 3.030 V 2.970 IO = 1 to 150mA 2.925 3.075 V 2.895 3.105 V 3.131 V TJ= -40 to 125°C VI = 4.1V 3.069 TJ= -40 to 125°C 3.0 2.879 2.921 VI = 4.0V 3.1 3.022 3.1775 V 2.9915 3.2085 V 3.232 V VI = 4.2V 3.168 IO = 1 to 150mA 3.120 3.280 V 3.088 3.312 V TJ= -40 to 125°C VI = 4.3V 3.267 IO = 1 to 150mA 3.2175 TJ= -40 to 125°C 3.333 V V 3.4155 V 3.535 V 3.587 V 3.622 V 3.636 V 3.510 3.690 V 3.474 3.726 V 3.838 V IO = 1 to 150mA 3.412 TJ= -40 to 125°C TJ= -40 to 125°C 3.762 TJ= -40 to 125°C 3.5 3.377 3.564 VI = 4.8V 3.3 3.1845 3.465 VI = 4.6V 3.2 3.3825 VI = 4.5V IO = 1 to 150mA Output Voltage V 2.525 2.5 V IO = 1 to 150mA VO V 2.898 IO = 1 to 150mA Output Voltage 1.845 1.863 2.702 TJ= -40 to 125°C IO = 1 to 150mA VO 1.755 1.737 V IO = 1 to 150mA VO V V IO = 1 to 150mA VO 1.818 1.8 2.828 IO = 1 to 150mA VO V V 2.870 IO = 1 to 150mA Output Voltage 1.538 1.553 2.772 IO = 1 to 150mA VO V 2.730 IO = 1 to 150mA VO V 1.515 VI = 3.8V IO = 1 to 50mA VO 16 1.5 IO = 1 to 150mA IO = 1 to 150mA VO TJ= -40 to 125°C Unit 1.462 2.475 IO = 1 to 150mA VO Max. 1.447 1.782 IO = 1 to 150mA VO Typ. 2.5 VI = 2.5V IO = 1 to 50mA VO Min. 3.6 3.8 3.705 3.895 V 3.667 3.933 V 4.04 V VI = 5.0V 3.96 IO = 1 to 150mA 3.9 4.1 V 3.86 4.14 V IO = 1 to 150mA TJ= -40 to 125°C 4 3/13 LD2985 SERIES Symbol VO Parameter Output Voltage Test Conditions Min. Typ. VI = 5.7V 4.653 4.7 IO = 1 to 150mA 4.582 IO = 1 to 150mA VO Output Voltage Short Circuit Current ∆VO/∆VI Line Regulation 4.5355 Dropout Voltage TJ= -40 to 125°C 0.003 IO = 0 1 TJ= -40 to 125°C 7 TJ= -40 to 125°C 40 TJ= -40 to 125°C IO = 50mA IO = 50mA 120 TJ= -40 to 125°C IO = 150mA 280 IO = 150mA TJ= -40 to 125°C IO = 0 IO = 0 80 TJ= -40 to 125°C IO = 1mA IO = 1mA 100 TJ= -40 to 125°C IO = 10mA IO = 10mA 200 TJ= -40 to 125°C IO = 50mA IO = 50mA 600 TJ= -40 to 125°C IO = 150mA 2000 IO = 150mA TJ= -40 to 125°C OFF MODE VINH<0.18V OFF MODE VINH<0.18V TJ= -40 to 125°C 0 45 Supply Voltage Rejection CBYP = 0.01µFCO = 10µF f = 1KHz VIL Control Input Logic Low TJ= -40 to 125°C VIH Control Input Logic High TJ= -40 to 125°C IiNH Control Input Current TJ= -40 to 125°C TJ= -40 to 125°C 4/13 V 400 VI = VO+1V to 16V, IO = 1mA IO = 10mA Output Noise Voltage V 5.175 IO = 1mA eN V 5.05 4.825 IO = 10mA SVR 4.8645 5.125 IO = 0 Quiescent Current V 4.875 IO = 1mA Id V IO = 1 to 150mA VI = VO+1V to 16V, IO = 1mA TJ= -40 to 125°C Vd 4.747 4.817 4.95 RL = 0 5 Unit VI = 6.0V IO = 1 to 150mA ISC TJ= -40 to 125°C Max. V mA 0.014 %/VI 0.032 %/VI 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 2 V V VSHDN = 5V 5 15 µA VSHDN = 0V 0 -1 µA B= 300Hz to 50KHz CO = 10µF CBYP = 0.01µF 30 µV LD2985 SERIES ELECTRICAL CHARACTERISTICS FOR LD2985B (TJ = 25°C, VI=VO+1V, IO=1mA, VSHDN=2V, CI = 1µF, CO = 1µF, unless otherwise specified) Symbol Parameter VOp Operating Input Voltage VO Output Voltage Test Conditions IO = 1 to 150mA Output Voltage 1.477 TJ= -40 to 125°C VI = 2.8V IO = 1 to 150mA Output Voltage TJ= -40 to 125°C VI = 3.5V IO = 1 to 150mA Output Voltage Output Voltage Output Voltage Output Voltage Output Voltage Output Voltage 2.425 2.575 V 2.4 2.6 V VI = 3.85V 2.807 2.764 TJ= -40 to 125°C VI = 4.0V TJ= -40 to 125°C 2.85 3.0 2.893 V 2.935 V 2.964 V 3.045 V 2.91 3.09 V 2.88 3.12 V 3.1465 V 3.0535 TJ= -40 to 125°C 2.8 2.736 2.955 VI = 4.1V 3.1 3.007 3.193 V 2.976 3.224 V VI = 4.2V 3.152 3.248 V IO = 1 to 150mA 3.104 3.296 V 3.072 3.328 V TJ= -40 to 125°C VI = 4.3V 3.2505 IO = 1 to 150mA 3.201 TJ= -40 to 125°C 3.447 IO = 1 to 150mA 3.395 TJ= -40 to 125°C VI = 4.6V TJ= -40 to 125°C 3.5 3.6 3.3495 V 3.399 V 3.432 V 3.552 V 3.605 V 3.640 V 3.654 V 3.492 3.708 V 3.456 3.744 V 3.857 V 3.743 TJ= -40 to 125°C 3.3 3.360 3.546 VI = 4.8V 3.2 3.168 VI = 4.5V IO = 1 to 150mA Output Voltage V IO = 1 to 150mA IO = 1 to 150mA VO 2.5375 2.5 V IO = 1 to 150mA Output Voltage V V 2.912 TJ= -40 to 125°C IO = 1 to 150mA VO 1.854 1.872 2.688 IO = 1 to 150mA VO 1.746 1.728 V IO = 1 to 150mA VO V V IO = 1 to 150mA VO 1.827 1.8 2.842 IO = 1 to 150mA Output Voltage V V 2.884 IO = 1 to 150mA VO 1.545 1.560 2.758 IO = 1 to 150mA Output Voltage V 2.716 IO = 1 to 150mA VO V 1.523 VI = 3.8V IO = 1 to 150mA VO 16 1.5 IO = 1 to 150mA IO = 1 to 150mA VO TJ= -40 to 125°C Unit 1.455 2.4625 IO = 1 to 150mA VO Max. 1.440 1.773 IO = 1 to 150mA VO Typ. 2.5 VI = 2.5V IO = 1 to 150mA VO Min. 3.8 3.686 3.914 V 3.648 3.952 V VI = 5.0V 3.94 4.06 V IO = 1 to 150mA 3.88 4.12 V 3.84 4.16 V IO = 1 to 150mA TJ= -40 to 125°C 4 5/13 LD2985 SERIES Symbol VO Parameter Output Voltage Test Conditions Min. Typ. Max. VI = 5.7V 4.6295 4.7 4.7705 V IO = 1 to 150mA 4.559 4.841 V 4.888 V 5.075 V IO = 1 to 150mA VO Output Voltage Short Circuit Current ∆VO/∆VI Line Regulation Vd Dropout Voltage 4.512 VI = 6.0V 4.925 IO = 1 to 150mA 4.85 5.15 V 4.8 5.2 V IO = 1 to 150mA ISC TJ= -40 to 125°C TJ= -40 to 125°C RL = 0 400 VI = VO+1V to 16V, IO = 1mA VI = VO+1V to 16V, TJ= -40 to 125°C IO = 1mA 0.003 IO = 0 IO = 0 1 TJ= -40 to 125°C IO = 1mA IO = 1mA 7 TJ= -40 to 125°C IO = 10mA IO = 10mA 40 TJ= -40 to 125°C IO = 50mA IO = 50mA 5 120 TJ= -40 to 125°C IO = 150mA 280 IO = 150mA TJ= -40 to 125°C Id Quiescent Current IO = 0 IO = 0 80 TJ= -40 to 125°C IO = 1mA IO = 1mA 100 TJ= -40 to 125°C IO = 10mA IO = 10mA 200 TJ= -40 to 125°C IO = 50mA IO = 50mA 600 TJ= -40 to 125°C IO = 150mA 2000 IO = 150mA TJ= -40 to 125°C SVR OFF MODE VINH<0.18V OFF MODE VINH<0.18V TJ= -40 to 125°C 0 45 Supply Voltage Rejection CBYP = 0.01µFCO = 10µF f = 1KHz VIL Control Input Logic Low TJ= -40 to 125°C VIH Control Input Logic High TJ= -40 to 125°C IiNH Control Input Current TJ= -40 to 125°C TJ= -40 to 125°C eN 6/13 Output Noise Voltage Unit mA 0.014 %/VI 0.032 %/VI 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 2 V V VSHDN = 5V 5 15 µA VSHDN = 0V 0 -1 µA B= 300Hz to 50KHz CO = 10µF CBYP = 0.01µF 30 µV LD2985 SERIES TYPICAL CHARACTERISTICS (unless otherwise specified TJ = 25°C, CI=1µF, CO=2.2µF, CBYP=100nF) Figure 1 : Output Voltage vs Temperature Figure 4 : Quiescent Current vs Load Current Figure 2 : Dropout Voltage vs Temperature Figure 5 : Quiescent Current vs Temperature Figure 3 : Dropout Voltage vs Output Current Figure 6 : Supply Voltage Rejection vs Temperature 7/13 LD2985 SERIES Figure 7 : Supply Voltage Rejection vs Output Current Figure 10 : Supply Voltage Rejection vs Frequency Figure 8 : Supply Voltage Rejection vs Output Current Figure 11 : Line Transient VO=2.5V, IO= 50mA, no CI, CO=4.7µF, tr=tf=2ns Figure 9 : Supply Voltage Rejection vs Frequency Figure 12 : Line Transient VO=2.5V, IO= 50mA, no CI, CO=4.7µF, tr=tf=1µs 8/13 LD2985 SERIES Figure 13 : Load Transient Figure 14 : Load Transient VO=2.5V, IO=0 to 50mA, no CI, CO=10µF, ts=tf=2ns VO=2.5V, IO=0 to 50mA, no CI, CO=4.7µF, ts=tf=2ns EXTERNAL CAPACITORS Like any low-dropout regulator, the LD2985 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 LD2985 (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 LD2985 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 to 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. 9/13 LD2985 SERIES REVERSE CURRENT The power transistor used in the LD2985 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; typical values are, respectively, 42.6 KΩ and 51.150 KΩ. Figure 15 : Reverse Current Test Circuit 10/13 LD2985 SERIES SOT23-5L MECHANICAL DATA mm. mils DIM. MIN. TYP MAX. MIN. TYP. MAX. A 0.90 1.45 35.4 57.1 A1 0.00 0.10 0.0 3.9 A2 0.90 1.30 35.4 51.2 b 0.35 0.50 13.7 19.7 C 0.09 0.20 3.5 7.8 D 2.80 3.00 110.2 118.1 E 1.50 1.75 59.0 68.8 e 0.95 37.4 H 2.60 3.00 102.3 118.1 L 0.10 0.60 3.9 23.6 . 7049676C 11/13 LD2985 SERIES Tape & Reel SOT23-xL MECHANICAL DATA mm. inch DIM. MIN. TYP A MIN. TYP. 180 13.0 13.2 MAX. 7.086 C 12.8 D 20.2 0.795 N 60 2.362 T 12/13 MAX. 0.504 0.512 14.4 0.519 0.567 Ao 3.13 3.23 3.33 0.123 0.127 0.131 Bo 3.07 3.17 3.27 0.120 0.124 0.128 Ko 1.27 1.37 1.47 0.050 0.054 0.0.58 Po 3.9 4.0 4.1 0.153 0.157 0.161 P 3.9 4.0 4.1 0.153 0.157 0.161 LD2985 SERIES Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. 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