LD2980 SERIES ULTRA LOW DROP VOLTAGE REGULATORS WITH INHIBIT LOW ESR OUTPUT CAPACITORS COMPATIBLE ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ STABLE WITH LOW ESR CERAMIC CAPACITORS ULTRA LOW DROPOUT VOLTAGE (0.12V TYP. AT 50mA LOAD, 7mV TYP. AT 1mA LOAD) VERY LOW QUIESCENT CURRENT (80µA TYP. AT NO LOAD IN ON MODE; MAX 1µA IN OFF MODE) GUARANTEED OUTPUT CURRENT UP TO 50mA LOGIC-CONTROLLED ELECTRONIC SHUTDOWN OUTPUT VOLTAGE OF 1.5; 1.8; 2.5; 2.85; 3.0; 3.2; 3.3; 3.6; 3.8; 4.0; 4.7; 4.85; 5.0V INTERNAL CURRENT AND THERMAL LIMIT ± 0.5% TOLERANCE OUTPUT VOLTAGE AVAILABLE (A VERSION) OUTPUT LOW NOISE VOLTAGE 160µVRMS TEMPERATURE RANGE: -40 TO 125°C SMALLEST PACKAGE SOT23-5L AND SOT-89 FAST DYNAMIC RESPONSE TO LINE AND LOAD CHANGES DESCRIPTION The LD2980 series are 50mA fixed-output voltage regulator. The low drop-voltage and the ultra low SOT23-5L SOT-89 quiescent current make them suitable for low noise, low power applications and in battery powered systems. The quiescent current in sleep mode is less than 1µA when INHIBIT pin is pulled low. Shutdown Logic Control function is available on pin n.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. The LD2980 is designed to work with low ESR ceramic capacitor. Typical applications are in cellular phone, palmtop/laptop computer, personal digital assistant (PDA), personal stereo, camcorder and camera. SCHEMATIC DIAGRAM September 2003 1/17 LD2980 SERIES ABSOLUTE MAXIMUM RATINGS Symbol Parameter VI VINH Value Unit DC Input Voltage -0.3 to 16 V INHIBIT Input Voltage -0.3 to 16 V IO Output Current Internally limited PD Power Dissipation Internally limited TSTG Storage Temperature Range -55 to 150 °C TOP Operating Junction Temperature Range -40 to 125 °C 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 Parameter Rthj-case Thermal Resistance Junction-case Rthj-amb Thermal Resistance Junction-ambient SOT23-5L SOT-89 Unit 81 15 °C/W 255 110 °C/W CONNECTION DIAGRAM (top view) SOT23-5L SOT-89 PIN DESCRIPTION Pin N° SOT23-5L Pin N° SOT-89 Symbol 1 3 VIN 2 3 2 GND INHIBIT 4 5 2/17 1 NC VOUT Name and Function Input Port Ground Pin 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 Not Connected Output Port LD2980 SERIES ORDERING CODES AB VERSION SOT23-5L LD2980ABM25TR LD2980ABM28TR LD2980ABM30TR LD2980ABM32TR LD2980ABM33TR LD2980ABM36TR LD2980ABM38TR LD2980ABM40TR LD2980ABM47TR LD2980ABM48TR LD2980ABM50TR C VERSION SOT-89 SOT23-5L SOT-89 OUTPUT VOLTAGES LD2980ABU25TR LD2980ABU28TR LD2980ABU30TR LD2980ABU32TR LD2980ABU33TR LD2980ABU36TR LD2980ABU38TR LD2980ABU40TR LD2980ABU47TR LD2980ABU48TR LD2980ABU50TR LD2980CM15TR LD2980CM18TR LD2980CM25TR LD2980CM28TR LD2980CM30TR LD2980CM32TR LD2980CM33TR LD2980CM36TR LD2980CM38TR LD2980CM40TR LD2980CM47TR LD2980CM48TR LD2980CM50TR LD2980CU15TR LD2980CU18TR LD2980CU25TR LD2980CU28TR LD2980CU30TR LD2980CU32TR LD2980CU33TR LD2980CU36TR LD2980CU38TR LD2980CU40TR LD2980CU47TR LD2980CU48TR LD2980CU50TR 1.5 V 1.8 V 2.5 V 2.85 V 3.0 V 3.2 V 3.3 V 3.6 V 3.8 V 4.0 V 4.7 V 4.85 V 5.0 V TYPICAL APPLICATION CIRCUIT (*) Inhibit Pin is not internally pulled-up then it must not be left floating. Disable the device when connected to GND or to a positive voltage less than 0.18V. 3/17 LD2980 SERIES ELECTRICAL CHARACTERISTICS FOR LD2980AB (Tj = 25°C, VI = VO(NOM) +1V, C I = 1µF(X7R), CO = 2.2µF(X7R), IO = 1mA, VINH = 2V, unless otherwise specified) Symbol Parameter VOP Operating Input Voltage VO Output Voltage Test Conditions IO = 1 to 50 mA Output Voltage 2.487 TJ= -40 to 125°C IO = 1 mA IO = 1 to 50 mA Output Voltage TJ= -40 to 125°C IO = 1 mA IO = 1 to 50 mA Output Voltage Output Voltage Output Voltage Output Voltage TJ= -40 to 125°C Output Voltage Output Voltage Output Voltage TJ= -40 to 125°C 4/17 3.023 3.075 3.284 3.275 TJ= -40 to 125°C 3.2 3.3 3.216 3.317 3.217 IO = 1 to 50 mA 3.573 3.627 3.51 3.690 TJ= -40 to 125°C 3.781 TJ= -40 to 125°C 3.6 3.8 3.618 3.819 3.772 3.829 3.705 3.895 IO = 1 mA 3.98 IO = 1 to 50 mA 3.97 4.03 3.9 4.1 TJ= -40 to 125°C IO = 1 mA 4.677 IO = 1 to 50 mA 4.665 TJ= -40 to 125°C 4.826 IO = 1 to 50 mA 4.814 TJ= -40 to 125°C IO = 1 mA TJ= -40 to 125°C 4.7 V V V 4.02 4.724 V V V V 4.735 4.818 4.85 4.874 V 4.886 4.729 4.975 VO(NOM) + 1 < VIN < 16 V IO = 1 mA TJ= -40 to 125°C 4 4.582 IO = 1 mA V 3.383 3.582 IO = 1 mA Unit 3.325 IO = 1 mA IO = 1 to 50 mA Line Regulation 3.015 2.978 IO = 1 mA IO = 1 to 50 mA ∆VO 3 2.925 IO = 1 to 50 mA IO = 1 to 50 mA VO 2.871 2.921 3.28 IO = 1 to 50 mA VO 2.828 2.779 3.12 IO = 1 to 50 mA VO 2.864 3.224 IO = 1 to 50 mA Output Voltage 2.85 3.176 IO = 1 to 50 mA VO 2.519 2.562 3.184 IO = 1 to 50 mA VO V IO = 1 mA IO = 1 to 50 mA VO V 2.513 IO = 1 to 50 mA IO = 1 to 50 mA VO 16 2.5 2.481 2.985 IO = 1 to 50 mA VO Max. 2.437 2.835 IO = 1 to 50 mA VO Typ. 2.5 IO = 1 mA IO = 1 to 50 mA VO Min. 4.971 5 5.025 4.963 5.038 4.875 5.125 0.003 0.014 0.032 V %/V LD2980 SERIES Symbol IQ Parameter Quiescent Current ON MODE Test Conditions Min. IO = 0 80 100 IO = 10 mA 175 IO = 50 mA 500 VINH < 0.18 V VINH < 0.18 V VDROP Dropout Voltage (NOTE 1) TJ= -40 to 125°C 7 40 IO = 50mA ISC 120 Short Circuit Current RL = 0 CO = 10µF VINH Inhibit Input Logic Low LOW = Output OFF TJ= -40 to 125°C VINL Inhibit Input Logic High HIGH = Output ON TJ= -40 to 125°C IINH Inhibit Input Current eN TSHDN Output Noise Voltage Thermal Shutdown 10 60 150 225 TJ= -40 to 125°C Supply Voltage Rejection f = 1KHz 150 mA 63 dB 0.8 1.6 0.18 1.3 VINH = 0V TJ= -40 to 125°C 0 -1 TJ= -40 to 125°C 5 15 CO = 10 µF V V VINH = 5V BW = 300 Hz to 50 KHz mV 90 TJ= -40 to 125°C SVR 3 15 TJ= -40 to 125°C IO = 10mA IO = 50mA 700 5 IO = 1mA IO = 10mA 250 1 1 IO = 1mA 150 0 TJ= -40 to 125°C IO = 0 IO = 0 µA 1200 TJ= -40 to 125°C IO = 50 mA 100 450 TJ= -40 to 125°C IO = 10 mA Unit 200 TJ= -40 to 125°C IO = 1 mA Max. 150 TJ= -40 to 125°C IO = 0 IO = 1 mA OFF MODE Typ. µA 160 µVRMS 170 °C (NOTE 1): For Vo < 2.5V dropout voltage can be calculated according to the minimum input voltage in full temperature range. 5/17 LD2980 SERIES ELECTRICAL CHARACTERISTICS FOR LD2980C (Tj = 25°C, VI = VO(NOM) +1V, C I = 1µF(X7R), CO = 2.2µF(X7R), IO = 1mA, VINH = 2V, unless otherwise specified) Symbol Parameter VOP Operating Input Voltage VO Output Voltage Test Conditions IO = 1 to 50 mA Output Voltage 1.478 TJ= -40 to 125°C IO = 1 mA IO = 1 to 50 mA Output Voltage TJ= -40 to 125°C IO = 1 mA IO = 1 to 50 mA Output Voltage Output Voltage Output Voltage TJ= -40 to 125°C Output Voltage Output Voltage Output Voltage TJ= -40 to 125°C 2.97 TJ= -40 to 125°C IO = 1 mA TJ= -40 to 125°C 3.152 3.248 3.312 3.3 3.333 3.251 3.35 3.184 3.415 3.546 3.654 3.474 3.726 IO = 1 mA 3.76 IO = 1 to 50 mA 3.743 TJ= -40 to 125°C 3.96 IO = 1 to 50 mA 3.94 TJ= -40 to 125°C IO = 1 mA TJ= -40 to 125°C 3.636 3.838 V V V V V V 3.933 4 4.04 V 4.06 4.14 4.7 4.747 4.630 4.771 4.864 4.85 4.899 4.777 4.923 4.68 5.02 IO = 1 mA 4.95 IO = 1 to 50 mA 4.925 5.075 4.825 5.175 TJ= -40 to 125°C V 3.857 4.535 4.802 TJ= -40 to 125°C 3.8 3.86 4.653 IO = 1 mA 3.6 3.667 IO = 1 mA IO = 1 to 50 mA 6/17 3.232 3.564 TJ= -40 to 125°C V 3.105 3.2 IO = 1 mA IO = 1 to 50 mA Output Voltage 3.03 Unit 3.045 IO = 1 to 50 mA IO = 1 to 50 mA VO 3 2.879 3.088 3.267 TJ= -40 to 125°C 2.85 2.895 3.168 IO = 1 mA IO = 1 to 50 mA Output Voltage 2.538 2.587 2.955 IO = 1 to 50 mA VO 2.525 2.463 IO = 1 mA IO = 1 to 50 mA VO 2.5 2.412 IO = 1 to 50 mA IO = 1 to 50 mA VO 1.827 1.863 2.949 IO = 1 to 50 mA VO 1.773 1.737 2.75 IO = 1 to 50 mA Output Voltage 1.818 2.893 IO = 1 to 50 mA VO 1.8 2.807 IO = 1 to 50 mA Output Voltage 1.530 1.555 2.822 IO = 1 to 50 mA VO V IO = 1 mA IO = 1 to 50 mA VO V 1.522 IO = 1 to 50 mA IO = 1 to 50 mA VO 16 1.5 1.470 2.475 IO = 1 to 50 mA VO Max. 1.445 1.782 IO = 1 to 50 mA VO Typ. 2.5 IO = 1 mA IO = 1 to 50 mA VO Min. 5 5.05 V V V LD2980 SERIES Symbol ∆VO Parameter Line Regulation Test Conditions Min. VO(NOM) + 1 < VIN < 16 V IO = 1 mA Typ. 0.003 Quiescent Current ON MODE IO = 0 80 IO = 1 mA 100 IO = 10 mA 175 IO = 50 mA 500 OFF MODE VINH < 0.18 V VINH < 0.18 V VDROP Dropout Voltage (NOTE 1) 3 7 10 15 TJ= -40 to 125°C 40 60 90 TJ= -40 to 125°C IO = 50mA 120 150 225 TJ= -40 to 125°C IO = 50mA Short Circuit Current RL = 0 SVR Supply Voltage Rejection CO = 10µF VINH Inhibit Input Logic Low LOW = Output OFF TJ= -40 to 125°C VINL Inhibit Input Logic High HIGH = Output ON TJ= -40 to 125°C IINH Inhibit Input Current VINH = 0V TJ= -40 to 125°C 0 -1 VINH = 5V TJ= -40 to 125°C 5 15 eN TSHDN Output Noise Voltage Thermal Shutdown 150 f = 1KHz BW = 300 Hz to 50 KHz CO = 10 µF mV 5 IO = 10mA ISC 700 1 TJ= -40 to 125°C IO = 10mA 250 1 TJ= -40 to 125°C IO = 1mA IO = 1mA 150 0 IO = 0 IO = 0 µA 1200 TJ= -40 to 125°C IO = 50 mA 100 450 TJ= -40 to 125°C IO = 10 mA %/V 200 TJ= -40 to 125°C IO = 1 mA 0.014 150 TJ= -40 to 125°C IO = 0 Unit 0.032 TJ= -40 to 125°C IQ Max. mA 63 0.8 1.6 dB 0.18 1.3 V V µA 160 µVRMS 170 °C (NOTE 1): For Vo < 2.5V dropout voltage can be calculated according to the minimum input voltage in full temperature range. 7/17 LD2980 SERIES TYPICAL PERFORMANCE CHARACTERISTICS (Tj = 25°C, VI = VO(NOM) +1V, CI = 1µF(X7R), CO = 2.2µF(X7R), VINH = 2V, unless otherwise specified) Figure 1 : Output Voltage vs Temperature Figure 4 : Load Regulation vs Temperature Figure 2 : Output Voltage vs Temperature Figure 5 : Dropout Voltage vs Temperature Figure 3 : Line Regulation vs Temperature Figure 6 : Quiescent Current vs Temperature 8/17 LD2980 SERIES Figure 7 : Quiescent Current vs Output Current Figure 10 : Dropout Voltage vs Output Current Figure 8 : OFF MODE Quiescent Current vs Temperature Figure 11 : Inhibit Input Current vs Temperature Figure 9 : Quiescent Current vs Input Voltage Figure 12 : Inhibit Voltage vs Temperature 9/17 LD2980 SERIES Figure 13 : Supply Voltage Rejection vs Frequency Figure 16 : Worst Case: Lowest Output Version Figure 14 : Noise Voltage vs Frequency Figure 17 : Load Transient Response VO = 4.7V, IO = 1 to 100mA, CO = 4.7µF X7R Figure 15 : Best Case: Highest Output Version Figure 18 : Line Transient Response VI = (VO(NOM) + 1V), VO = 4.7V, IO = 100mA, CO = 4.7µF X7R 10/17 LD2980 SERIES APPLICATION NOTES EXTERNAL CAPACITORS Like any low-dropout regulator, the LD2980 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 LD2980 (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 LD2980 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 ESR (equivalent series resistance) value. The figures 1 and 2 show the allowable ESR range as a function of the output capacitance. These curves represent the stability region over the full temperature and IO range. Due to the different loop gain, the stability improves for higher output versions and so the suggested minimum output capacitor value, if low ESR ceramic type is used, is 1µF for output voltages equal or major than 3.8V, 2.2µF for output voltages from 2.85 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 (see Figure1 & Figure2 to choose the right value according to the used version and keeping in account that the ESR of ceramic capacitors has been measured @ 100KHz). 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 LD2980 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, according to the test circuit in figure 19, flows to the GND across the two feedback resistors. This current typical value is 160µA. R1 and R 2 resistors are implanted type; typical values are, respectively, 42.6 KΩ and 51.150 KΩ. 11/17 LD2980 SERIES Figure 19 : Reverse Current Test Circuit 12/17 LD2980 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 13/17 LD2980 SERIES SOT-89 MECHANICAL DATA mm. mils DIM. MIN. TYP MAX. MIN. TYP. MAX. A 1.4 1.6 55.1 63.0 B 0.44 0.56 17.3 22.0 B1 0.36 0.48 14.2 18.9 C 0.35 0.44 13.8 17.3 C1 0.35 0.44 13.8 17.3 D 4.4 4.6 173.2 181.1 D1 1.62 1.83 63.8 72.0 E 2.29 2.6 90.2 102.4 e 1.42 1.57 55.9 61.8 e1 2.92 3.07 115.0 120.9 H 3.94 4.25 155.1 167.3 L 0.89 1.2 35.0 47.2 P025H 14/17 LD2980 SERIES Tape & Reel SOT23-xL MECHANICAL DATA mm. inch DIM. MIN. TYP A MAX. MIN. TYP. 180 13.0 7.086 C 12.8 D 20.2 0.795 N 60 2.362 T 13.2 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 15/17 LD2980 SERIES Tape & Reel SOT89 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 16/17 MAX. 0.504 0.512 14.4 0.519 0.567 Ao 4.70 4.80 4.90 0.185 0.189 0.193 Bo 4.30 4.40 4.50 0.169 0.173 0.177 Ko 1.70 1.80 1.90 0.067 0.071 0.075 Po 3.9 4.0 4.1 0.153 0.157 0.161 P 7.9 8.0 8.1 0.311 0.315 0.319 LD2980 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. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics All other names are the property of their respective owners © 2003 STMicroelectronics - All Rights Reserved STMicroelectronics GROUP OF COMPANIES Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States. http://www.st.com 17/17