LD1117A SERIES LOW DROP FIXED AND ADJUSTABLE POSITIVE VOLTAGE REGULATORS ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ LOW DROPOUT VOLTAGE (1.15V TYP. @ IOUT = 1A, 25°C) VERY LOW QUIESCENT CURRENT (5 mA TYP. @ 25°C) OUTPUT CURRENT UP TO 1A FIXED OUTPUT VOLTAGE OF: 1.8V, 2.5V, 2.85V, 3.3V, 5.0V ADJUSTABLE VERSION AVAILABILITY (Vrel = 1.25V) INTERNAL CURRENT AND THERMAL LIMIT ONLY 10 µF FOR STABILITY AVAILABLE IN ± 2% (AT 25°C) AND 4% IN FULL TEMPERATURE RANGE HIGH SUPPLY VOLTAGE REJECTION: (80dB TYP. AT 25°C) TEMPERATURE RANGE: 0°C TO 125°C DESCRIPTION The LD1117A is a LOW DROP Voltage Regulator able to provide up to 1A of Output Current, available even in adjustable version (Vref=1.25V). Concerning fixed versions, are offered the following Output Voltages: 1.8V, 2.5V, 2.85V, 3.3V and 5.0V. The 2.85V type is ideal for SCSI-2 lines active termination. The device is supplied in: TO-220 SOT-223 DPAK SOT-223, DPAK and TO-220. The surface mount packages optimize the thermal characteristics even offering a relevant space saving effect. High efficiency is assured by NPN pass transistor. Only a very common 10µF minimum capacitor is needed for stability. Only chip trimming allows the regulator to reach a very tight output voltage tolerance, within ± 2% at 25 °C. BLOCK DIAGRAM October 2003 1/16 LD1117A SERIES ABSOLUTE MAXIMUM RATINGS Symbol Parameter² Value Unit VIN DC Input Voltage 10 V Ptot Power Dissipation 12 W Tstg Storage Temperature Range Top Operating Junction Temperature Range -40 to +150 °C 0 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. Over the above suggested Max Power Dissipation a Short Circuit could definitively damage the device. THERMAL DATA Symbol Parameter TO-220 SOT-223 DPAK Unit 15 8 °C/W Rthj-case Thermal Resistance Junction-case 3 Rthj-amb Thermal Resistance Junction-ambient 50 APPLICATION CIRCUIT (FOR OTHER FIXED OUTPUT VOLTAGES) 2/16 °C/W LD1117A SERIES CONNECTION DIAGRAM (top view) DPAK SOT-223 TO-220 NOTE: The TAB is connected to the VOUT. ORDERING CODES SOT-223 DPAK TO-220 OUTPUT VOLTAGE LD1117AS18TR LD1117AS25TR LD1117AS28TR LD1117AS33TR LD1117AS50TR LD1117AST-R LD1117ADT18TR LD1117ADT25TR LD1117ADT28TR LD1117ADT33TR LD1117ADT50TR LD1117ADT-R LD1117AV18 LD1117AV25 LD1117AV28 LD1117AV33 LD1117AV50 LD1117AV 1.8 V 2.5 V 2.85 V 3.3 V 5V ADJUSTABLE FROM 1.25 TO 15 V 3/16 LD1117A SERIES ELECTRICAL CHARACTERISTICS OF LD1117A#18 (refer to the test circuits, TJ = 0 to 125°C, CO = 10 µF, CI = 10 µF unless otherwise specified) Symbol Parameter Test Conditions VO Output Voltage VI = 3.8 V VO Output Voltage IO = 0 to 1 A IO = 10 mA VI = 3.3 to 8 V TJ = 25°C ∆VO Line Regulation VI = 3.3 to 8 V IO = 0 mA ∆VO Load Regulation VI = 3.3 V IO = 0 to 1 A ∆VO Temperature Stability ∆VO Long Term Stability Operating Input Voltage Id Quiescent Current VI ≤ 8 V IO Output Current VI - VO = 5 V TJ = 25°C B =10Hz to 10KHz TJ = 25°C eN VD Output Noise Voltage Supply Voltage Rejection Dropout Voltage Typ. 1.764 1.8 IO = 0 mA IO = 500 mA IO = 1 A ∆VO(pwr) Thermal Regulation Ta = 25°C V V 1 6 mV 1 10 mV 0.5 % 0.3 % 10 V 10 mA 1000 60 30ms Pulse Unit 1.836 5 IO = 40 mA f = 120Hz VI - VO = 3 V Vripple = 1 VPP IO = 100 mA Max. 1.872 1.728 1000 hrs, TJ = 125°C IO = 100 mA VI SVR Min. mA 100 µV 80 dB 1 1.10 1.05 1.15 1.15 1.30 0.08 0.2 V %/W ELECTRICAL CHARACTERISTICS OF LD1117A#25 (refer to the test circuits, TJ = 0 to 125°C, CO = 10 µF, CI = 10 µF unless otherwise specified) Symbol Parameter Test Conditions IO = 10 mA TJ = 25°C Min. Typ. Max. Unit 2.45 2.5 2.55 V 2.6 V VO Output Voltage VI = 4.5 V VO Output Voltage IO = 0 to 1 A VI = 3.9 to 8 V ∆VO Line Regulation VI = 3.9 to 8 V IO = 0 mA 1 6 mV ∆VO Load Regulation VI = 3.9 V IO = 0 to 1 A 1 10 mV ∆VO Temperature Stability ∆VO Long Term Stability VI Operating Input Voltage 1000 hrs, TJ = 125°C IO = 100 mA Id Quiescent Current VI ≤ 10 V IO Output Current VI - VO = 5 V TJ = 25°C eN Output Noise Voltage B =10Hz to 10KHz TJ = 25°C Supply Voltage Rejection IO = 40 mA f = 120Hz VI - VO = 3 V Vripple = 1 VPP IO = 100 mA SVR VD Dropout Voltage ∆VO(pwr) Thermal Regulation 4/16 2.4 IO = 0 mA 0.5 % 0.3 % 5 1000 60 10 V 10 mA 1200 mA 100 µV 80 dB 1 1.10 IO = 500 mA 1.05 1.15 IO = 1 A 1.15 1.30 0.08 0.2 Ta = 25°C 30ms Pulse V %/W LD1117A SERIES ELECTRICAL CHARACTERISTICS OF LD1117A#28 (refer to the test circuits, TJ = 0 to 125°C, CO = 10 µF, CI = 10 µF unless otherwise specified) Symbol Parameter Test Conditions IO = 10 mA Min. Typ. 2.85 VO Output Voltage VI = 4.85 V TJ = 25°C 2.793 VO Output Voltage IO = 0 to 1 A VI = 4.25 to 10 V 2.736 ∆VO Line Regulation VI = 4.25 to 8 V IO = 0 mA ∆VO Load Regulation VI = 4.25 V IO = 0 to 1 A ∆VO Temperature Stability ∆VO Long Term Stability 1000 hrs, TJ = 125°C IO = 100 mA VI Operating Input Voltage Id Quiescent Current VI ≤ 10 V IO Output Current VI - VO = 5 V TJ = 25°C B =10Hz to 10KHz TJ = 25°C eN SVR VD Output Noise Voltage Supply Voltage Rejection Dropout Voltage IO = 0 mA IO = 40 mA f = 120Hz VI - VO = 3 V Vripple = 1 VPP IO = 100 mA 60 IO = 500 mA IO = 1 A ∆VO(pwr) Thermal Regulation Ta = 25°C 30ms Pulse Unit 2.907 V 2.964 V 1 6 mV 1 10 mV 0.5 % 0.3 % 4.5 1000 Max. 10 V 10 mA 1200 mA 100 µV 75 dB 1 1.10 1.05 1.15 1.15 1.30 0.08 0.2 V %/W ELECTRICAL CHARACTERISTICS OF LD1117A#33 (refer to the test circuits, TJ = 0 to 125°C, CO = 10 µF, CI = 10 µF unless otherwise specified) Symbol Parameter Test Conditions IO = 10 mA Min. Typ. 3.3 VO Output Voltage VI = 5.3 V TJ = 25°C 3.234 VO Output Voltage IO = 0 to 1 A VI = 4.75 to 10 V 3.168 ∆VO Line Regulation VI = 4.75 to 8 V IO = 0 mA ∆VO Load Regulation VI = 4.75 V IO = 0 to 1 A ∆VO Temperature Stability ∆VO Long Term Stability VI Operating Input Voltage 1000 hrs, TJ = 125°C IO = 100 mA Id Quiescent Current VI ≤ 10 V IO Output Current VI - VO = 5 V TJ = 25°C eN Output Noise Voltage B =10Hz to 10KHz TJ = 25°C Supply Voltage Rejection IO = 40 mA f = 120Hz VI - VO = 3 V Vripple = 1 VPP IO = 100 mA SVR VD Dropout Voltage ∆VO(pwr) Thermal Regulation IO = 0 mA 60 3.366 V V 1 6 mV 1 10 mV 0.5 % 0.3 % 10 V 10 mA 1200 mA 100 µV 75 dB 1 1.10 IO = 500 mA 1.05 1.15 IO = 1 A 1.15 1.30 0.08 0.2 Ta = 25°C 30ms Pulse Unit 3.432 5 1000 Max. V %/W 5/16 LD1117A SERIES ELECTRICAL CHARACTERISTICS OF LD1117A#50 (refer to the test circuits, TJ = 0 to 125°C, CO = 10 µF, CI = 10 µF unless otherwise specified) Symbol Parameter Test Conditions VO Output Voltage VI = 7 V VO Output Voltage IO = 0 to 1 A IO = 10 mA VI = 6.4 to 10 V TJ = 25°C ∆VO Line Regulation VI = 6.4 to 8 V IO = 0 mA ∆VO Load Regulation VI = 6.4 V IO = 0 to 1 A ∆VO Temperature Stability ∆VO Long Term Stability Operating Input Voltage Id Quiescent Current VI ≤ 10 V IO Output Current VI - VO = 5 V TJ = 25°C B =10Hz to 10KHz TJ = 25°C eN VD Output Noise Voltage Supply Voltage Rejection Dropout Voltage Typ. 4.9 5 IO = 0 mA IO = 40 mA f = 120Hz VI - VO = 3 V Vripple = 1 VPP IO = 100 mA 60 IO = 500 mA IO = 1 A ∆VO(pwr) Thermal Regulation Ta = 25°C 30ms Pulse Unit 5.1 V V 1 6 mV 1 10 mV 0.5 % 0.3 % 5 1000 Max. 5.2 4.8 1000 hrs, TJ = 125°C IO = 100 mA VI SVR Min. 10 V 10 mA 1200 mA 100 µV 80 dB 1 1.10 1.05 1.15 1.15 1.30 0.08 0.2 V %/W ELECTRICAL CHARACTERISTICS OF LD1117A (ADJUSTABLE) (refer to the test circuits, TJ = 0 to 125°C, CO = 10 µF, CI = 10 µF unless otherwise specified) Symbol Parameter Test Conditions IO = 10 mA TJ = 25°C Min. Typ. Max. Unit 1.225 1.25 1.275 V 1.3 V VO Output Voltage VI = 5.3 V VO Output Voltage IO = 0 to 1 A VI = 2.75 to 10 V ∆VO Line Regulation VI = 2.75 to 8 V IO = 0 mA 1 6 mV ∆VO Load Regulation VI = 2.75 V IO = 0 to 1 A 1 10 mV ∆VO Temperature Stability ∆VO Long Term Stability VI Operating Input Voltage 1000 hrs, TJ = 125°C IO = 100 mA Id Quiescent Current VI ≤ 8 V IO Output Current VI - VO = 5 V TJ = 25°C eN Output Noise Voltage B =10Hz to 10KHz TJ = 25°C Supply Voltage Rejection IO = 40 mA f = 120Hz VI - VO = 3 V Vripple = 1 VPP IO = 100 mA SVR VD Dropout Voltage ∆VO(pwr) Thermal Regulation 6/16 1.2 IO = 0 mA 0.5 % 0.3 % 5 1000 60 10 V 10 mA 1200 mA 100 µV 80 dB 1 1.10 IO = 500 mA 1.05 1.15 IO = 1 A 1.15 1.30 0.08 0.2 Ta = 25°C 30ms Pulse V %/W LD1117A SERIES TYPICAL APPLICATIONS Figure 1 : Negative Supply Figure 2 : Active Terminator for SCSI-2 BUS Figure 3 : Circuit for Increasing Output Voltage 7/16 LD1117A SERIES Figure 4 : Voltage Regulator With Reference Figure 5 : Battery Backed-up Regulated Supply 8/16 LD1117A SERIES Figure 6 : Post-Regulated Dual Supply 9/16 LD1117A SERIES LD1117A ADJUSTABLE: APPLICATION NOTE The LD1117A ADJUSTABLE has a thermal stabilized 1.25±0.012V reference voltage between the OUT and ADJ pins. IADJ is 60µA typ. (120µA max.) and ∆IADJ is 1µA typ. (5µA max.). R1 is normally fixed to 120Ω. From figure 7 we obtain: VOUT = VREF + R2 (IADJ + IR1) = VREF + R2 (IADJ +VREF /R1) = VREF (1 + R2 / R1) + R2 x IADJ. In normal application R2 value is in the range of few Kohm, so the R2 x IDJ product could not be considered in the VOUT calculation; then the above expression becomes: VOUT = VREF (1 + R2 / R1). In order to have the better load regulation it is important to realize a good Kelvin connection of R1 and R2 resistors. In particular R1 connection must be realized very close to OUT and ADJ pin, while R2 ground connection must be placed as near as possible to the negative Load pin. Ripple rejection can be improved by introducing a 10µF electrolytic capacitor placed in parallel to the R2 resistor (see Fig.8). Figure 7 : Adjustable Output Voltage Application Figure 8 : Adjustable Output Voltage Application with improved Ripple Rejection 10/16 LD1117A SERIES SOT-223 MECHANICAL DATA mm. mils DIM. MIN. TYP A MAX. MIN. TYP. 1.8 A1 0.02 B 0.6 B1 MAX. 70.9 0.1 0.8 3.9 0.7 0.85 23.6 27.6 33.5 2.9 3 3.15 114.2 118.1 124.0 c 0.24 0.26 0.35 9.4 10.2 13.8 D 6.3 6.5 6.7 248.0 255.9 263.8 e 2.3 90.6 e1 4.6 181.1 E 3.3 3.5 3.7 129.9 137.8 145.7 H 6.7 7 7.3 129.9 137.8 145.7 V 10˚ 10˚ 0046067/H 11/16 LD1117A SERIES DPAK MECHANICAL DATA mm. inch DIM. MIN. TYP MAX. MIN. TYP. MAX. A 2.2 2.4 0.086 0.094 A1 0.9 1.1 0.035 0.043 A2 0.03 0.23 0.001 0.009 B 0.64 0.9 0.025 0.035 B2 5.2 5.4 0.204 0.212 C 0.45 0.6 0.017 0.023 C2 0.48 0.6 0.019 0.023 D 6 6.2 0.236 0.244 E 6.4 6.6 0.252 0.260 G 4.4 4.6 0.173 0.181 H 9.35 10.1 0.368 0.397 L2 L4 0.8 0.6 0.031 1 0.023 0.039 0068772-B 12/16 LD1117A SERIES TO-220 MECHANICAL DATA DIM. mm. MIN. MAX. MIN. A 4.40 4.60 0.173 0.181 C 1.23 1.32 0.048 0.051 D 2.40 2.72 0.094 0.107 D1 TYP inch 1.27 TYP. MAX. 0.050 E 0.49 0.70 0.019 0.027 F 0.61 0.88 0.024 0.034 F1 1.14 1.70 0.044 0.067 F2 1.14 1.70 0.044 0.067 G 4.95 5.15 0.194 0.203 G1 2.4 2.7 0.094 0.106 H2 10.0 10.40 0.393 L2 16.4 0.409 0.645 L4 13.0 14.0 0.511 0.551 L5 2.65 2.95 0.104 0.116 L6 15.25 15.75 0.600 0.620 L7 6.2 6.6 0.244 0.260 L9 3.5 3.93 0.137 0.154 DIA. 3.75 3.85 0.147 0.151 P011C 13/16 LD1117A SERIES Tape & Reel SOT223 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 14/16 MAX. 0.504 0.512 14.4 0.519 0.567 Ao 6.73 6.83 6.93 0.265 0.269 0.273 Bo 7.32 7.42 7.52 0.288 0.292 0.296 Ko 1.78 2 0.070 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 0.078 LD1117A SERIES Tape & Reel DPAK-PPAK MECHANICAL DATA mm. inch DIM. MIN. TYP A MAX. MIN. TYP. 330 13.0 12.992 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 6.80 6.90 7.00 0.268 0.272 0.2.76 Bo 10.40 10.50 10.60 0.409 0.413 0.417 Ko 2.55 2.65 2.75 0.100 0.104 0.105 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 15/16 LD1117A 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. 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