LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 800mA Low Dropout Positive Regulators Adjustable and Fixed 2.85V, 3.3V, 5V FEATURES DESCRIPTION n The LT®1117 is a positive low dropout regulator designed to provide up to 800mA of output current. The device is available in an adjustable version and fixed output voltages of 2.85V, 3.3V and 5V. The 2.85V version is designed specifically to be used in Active Terminators for the SCSI bus. All internal circuitry is designed to operate down to 1V input to output differential. Dropout voltage is guaranteed at a maximum of 1.2V at 800mA, decreasing at lower load currents. On chip trimming adjusts the reference/output voltage to within ± 1%. Current limit is also trimmed in order to minimize the stress on both the regulator and the power source circuitry under overload conditions. n n n n n n Space Saving SOT-223 Surface Mount Package 3-Terminal Adjustable or Fixed 2.85V, 3.3V, 5V Output Current of 800mA Operates Down to 1V Dropout Guaranteed Dropout Voltage at Multiple Current Levels 0.2% Line Regulation Max 0.4% Load Regulation Max APPLICATIONS n n n n n Active SCSI Terminators High Efficiency Linear Regulators Post Regulators for Switching Supplies Battery Chargers 5V to 3.3V Linear Regulators L, LT, LTC, LTM, Linear Technology, OPTI-LOOP and the Linear logo are registered trademarks of Linear Technology Corporation. UltraFast is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. The low profile surface mount SOT-223 package allows the device to be used in applications where space is limited. The LT1117 requires a minimum of 10μF of output capacitance for stability. Output capacitors of this size or larger are normally included in most regulator designs. Unlike PNP type regulators where up to 10% of the output current is wasted as quiescent current, the quiescent current of the LT1117 flows into the load, increasing efficiency. TYPICAL APPLICATION Active Terminator for SCSI-2 Bus Dropout Voltage (VIN – VOUT) 1.4 110Ω –40°C ≤ TJ < 0°C 1.2 IN 4.75V TO 5.25V 10μF 18 TO 27 LINES OUT GND + 110Ω + 22μF 110Ω 1117 TA01 DROPOUT VOLTAGE (V) 110Ω LT1117-2.85 0°C ≤ TJ ≤ 125°C 1.0 TJ = 25°C 0.8 TJ = 125°C 0.6 0.4 0.2 INDICATES GUARANTEED TEST POINT 0 0 100 200 300 400 500 600 700 800 OUTPUT CURRENT (mA) 1117 TA02 1117fd 1 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 ABSOLUTE MAXIMUM RATINGS (Note 1) Input Voltage Operating Voltage LT1117, LT1117-3.3, LT1117-5 .........................15V LT1117-2.85 .....................................................10V Surge Voltage LT1117, LT1117-3.3, LT1117-5 .........................20V Operating JunctionTemperature Range C Grade .................................................. 0°C to 125°C I Grade ...............................................– 40°C to 125°C Storage Temperature Range...................–65°C to 150°C Lead Temperature ....................(See Soldering Methods) PIN CONFIGURATION FRONT VIEW FRONT VIEW TAB IS VOUT 3 IN 2 OUT 1 ADJ/GND TAB IS VOUT ST PACKAGE 3-LEAD PLASTIC SOT-223 TJMAX = 125°C, θJC = 15°C/W 3 IN 2 OUT 1 ADJ/GND M PACKAGE 3-LEAD PLASTIC DD-PAK TJMAX = 125°C, θJC = 10°C/W ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT1117CST#PBF LT1117CST#TRPBF 1117 3-Lead Plastic SOT-223 0°C to 125°C LT1117IST#PBF LT1117IST#TRPBF 1117I 3-Lead Plastic SOT-223 –40°C to 125°C LT1117CST-2.85#PBF LT1117CST-2.85#TRPBF 11172 3-Lead Plastic SOT-223 0°C to 125°C LT1117IST-2.85#PBF LT1117IST-2.85#TRPBF 1117I2 3-Lead Plastic SOT-223 –40°C to 125°C LT1117CST-3.3#PBF LT1117CST-3.3#TRPBF 11173 3-Lead Plastic SOT-223 0°C to 125°C LT1117IST-3.3#PBF LT1117IST-3.3#TRPBF 1117I3 3-Lead Plastic SOT-223 –40°C to 125°C LT1117CST-5#PBF LT1117CST-5#TRPBF 11175 3-Lead Plastic SOT-223 0°C to 125°C LT1117IST-5#PBF LT1117IST-5#TRPBF 1117I5 3-Lead Plastic SOT-223 –40°C to 125°C LT1117CM#PBF LT1117CM#TRPBF LT1117CM 3-Lead Plastic DD-PAK 0°C to 125°C LT1117CM-2.85#PBF LT1117CM-2.85#TRPBF LT1117CM-2.85 3-Lead Plastic DD-PAK 0°C to 125°C LT1117CM-3.3#PBF LT1117CM-3.3#TRPBF LT1117CM-3.3 3-Lead Plastic DD-PAK 0°C to 125°C LT1117CM-5#PBF LT1117CM-5#TRPBF LT1117CM-5 3-Lead Plastic DD-PAK 0°C to 125°C 1117fd 2 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 ORDER INFORMATION LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT1117CST LT1117CST#TR 1117 3-Lead Plastic SOT-223 0°C to 125°C LT1117IST LT1117IST#TR 1117I 3-Lead Plastic SOT-223 –40°C to 125°C LT1117CST-2.85 LT1117CST-2.85#TR 11172 3-Lead Plastic SOT-223 0°C to 125°C LT1117IST-2.85 LT1117IST-2.85#TR 1117I2 3-Lead Plastic SOT-223 –40°C to 125°C LT1117CST-3.3 LT1117CST-3.3#TR 11173 3-Lead Plastic SOT-223 0°C to 125°C LT1117IST-3.3 LT1117IST-3.3#TR 1117I3 3-Lead Plastic SOT-223 –40°C to 125°C LT1117CST-5 LT1117CST-5#TR 11175 3-Lead Plastic SOT-223 0°C to 125°C LT1117IST-5 LT1117IST-5#TR 1117I5 3-Lead Plastic SOT-223 –40°C to 125°C LT1117CM LT1117CM#TR LT1117CM 3-Lead Plastic DD-PAK 0°C to 125°C LT1117CM-2.85 LT1117CM-2.85#TR LT1117CM-2.85 3-Lead Plastic DD-PAK 0°C to 125°C LT1117CM-3.3 LT1117CM-3.3#TR LT1117CM-3.3 3-Lead Plastic DD-PAK 0°C to 125°C LT1117CM-5 LT1117CM-5#TR LT1117CM-5 3-Lead Plastic DD-PAK 0°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/ ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS Reference Voltage LT1117 IOUT = 10mA, (VIN – VOUT) = 2V, TJ = 25°C 10mA ≤ IOUT ≤ 800mA, 1.4V ≤ (VIN – VOUT) ≤ 10V l 1.238 1.225 1.250 1.250 1.262 1.270 V V Output Voltage LT1117-2.85 IOUT = 10mA, VIN = 4.85V, TJ = 25°C 0 ≤ IOUT ≤ 800mA, 4.25V ≤ VIN ≤ 10V 0 ≤ IOUT ≤ 500mA, VIN = 3.95V l l 2.820 2.790 2.790 2.850 2.850 2.850 2.880 2.910 2.910 V V V LT1117-3.3 IOUT = 10mA, VIN = 5V, TJ = 25°C 0 ≤ IOUT ≤ 800mA, 4.75V ≤ VIN ≤ 10V l 3.267 3.235 3.300 3.300 3.333 3.365 V V LT1117-5 IOUT = 10mA, VIN = 7V, TJ = 25°C 0 ≤ IOUT ≤ 800mA, 6.5V ≤ VIN ≤ 12V l 4.950 4.900 5.000 5.000 5.050 5.100 V V Line Regulation LT1117 LT1117-2.85 LT1117-3.3 LT1117-5 IOUT = 10mA, 1.5V ≤ VIN – VOUT ≤ 15V (Note 2) IOUT = 0mA, 4.25V ≤ VIN ≤ 10V (Note 2) IOUT = 0mA, 4.75V ≤ VIN ≤ 15V (Note 2) IOUT = 0mA, 6.5V ≤ VIN ≤ 15V (Note 2) l l l l 0.035 1 1 1 0.2 6 6 10 % mV mV mV Load Regulation LT1117 LT1117-2.85 LT1117-3.3 LT1117-5 (VIN – VOUT) = 3V, 10mA ≤ IOUT ≤ 800mA (Note 2) VIN = 4.25V, 0 ≤ IOUT ≤ 800mA (Note 2) VIN = 4.75V, 0 ≤ IOUT ≤ 800mA (Note 2) VIN = 6.5V, 0 ≤ IOUT ≤ 800mA (Note 2) l l l l 0.1 1 1 1 0.4 10 10 15 % mV mV mV IOUT = 100mA, 0°C ≤ TJ ≤ 125°C (Note 3) IOUT = 500mA, 0°C ≤ TJ ≤ 125°C (Note 3) IOUT = 800mA, 0°C ≤ TJ ≤ 125°C (Note 3) 1.00 1.05 1.10 1.10 1.15 1.20 V V V IOUT = 100mA, – 40°C ≤ TJ < 0°C (Note 3) IOUT = 500mA, – 40°C ≤ TJ < 0°C (Note 3) IOUT = 800mA, – 40°C ≤ TJ < 0°C (Note 3) 1.00 1.05 1.10 1.20 1.25 1.30 V V V 950 1200 mA 1.7 5 mA Dropout Voltage (VIN – VOUT) = 5V, TJ = 25°C Current Limit Minimum Load Current LT1117 (VIN – VOUT) = 15V (Note 4) 800 l 1117fd 3 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TJ = 25°C. PARAMETER Quiescent Current CONDITIONS MIN Thermal Regulation TA = 25°C, 30ms Pulse Ripple Rejection fRIPPLE = 120Hz, (VIN – VOUT) = 3V, VRIPPLE = 1VP-P l Adjust Pin Current 10mA ≤ IOUT ≤ 800mA, 1.4V ≤ (VIN – VOUT) ≤ 10V Adjust Pin Current Change TYP MAX 5 5 5 10 10 10 mA mA mA 0.01 0.1 %/W l l l VIN ≤ 10V VIN ≤ 15V VIN ≤ 15V LT1117-2.85 LT1117-3.3 LT1117-5 60 75 TA = 125°C, 1000Hrs RMS Output Noise (% of VOUT), 10Hz ≤ f ≤ 10kHz Thermal Resistance (Junction-to-Case, at Tab) Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: See thermal regulation specification for changes in output voltage due to heating effects. Load regulation and line regulation are measured at a constant junction temperature by low duty cycle pulse testing. dB l 55 120 μA l 0.2 5 μA Temperature Stability Long Term Stability UNITS 0.5 % 0.3 % 0.003 % 15 °C/W Note 3: Dropout voltage is specified over the full output current range of the device. Dropout voltage is defined as the minimum input/output differential measured at the specified output current. Test points and limits are also shown on the Dropout Voltage curve. Note 4: Minimum load current is defined as the minimum output current required to maintain regulation. TYPICAL PERFORMANCE CHARACTERISTICS Minimum Operating Current (Adjustable Device) Short-Circuit Current Load Regulation 1.25 TJ = 125°C TJ = 25°C 2 TJ = –55°C 1 0 0.10 TJ = 125°C 1.00 OUTPUT VOLTAGE DEVIATION (%) 3 SHORT CIRCUIT CURRENT (A) MINIMUM OPERATING CURRENT (mA) 4 TJ = 25°C 0.75 0.50 0.25 0 0 10 15 5 INPUT/OUTPUT DIFFERENTIAL (V) 20 1117 G01 0 5 10 INPUT/OUTPUT DIFFERENTIAL (V) 15 1117 G02 ΔILOAD = 800mA 0.05 0 –0.05 –0.10 –0.15 –0.20 –50 –25 0 25 50 75 TEMPERATURE (°C) 100 125 1117 G03 1117fd 4 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 TYPICAL PERFORMANCE CHARACTERISTICS LT1117 Ripple Rejection vs Current 100 100 90 VRIPPLE ≤ 3VP-P VRIPPLE ≤ 0.5VP-P 80 (VIN – VOUT) ≥ 3V 70 60 50 40 (VIN – VOUT) ≥ VDROPOUT 30 10 0 RIPPLE REJECTION (dB) 100 VRIPPLE ≤ 3VP-P 60 fRIPPLE = 20kHz 50 40 VRIPPLE ≤ 0.5VP-P 30 20 CADJ = 200μF AT f < 60Hz CADJ = 25μF AT f > 60Hz IOUT = 0.5A 10 70 fRIPPLE = 120Hz 0 1k 10k FREQUENCY (Hz) 0 100k 0.2 0.4 0.6 OUTPUT CURRENT (A) 1117 G04 0 –1.0 –2.0 –50 –25 0.8 0.3 80 60 LT1117-5 Load Transient Response 0.3 CIN = 10μF COUT = 10μF TANTALUM VIN = 4.25V PRELOAD = 0.1A 0.2 0.1 OUTPUT VOLTAGE DEVIATION (V) OUTPUT VOLTAGE DEVIATION (V) 100 70 0 CIN = 10μF 0.2 COUT = 10μF TANTALUM VIN = 6.5V 0.1 PRELOAD = 0.1A 0 –0.1 –0.1 –0.2 –0.2 20 10 0 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) LOAD CURRENT (A) 50 40 30 0.5 0 –0.5 0 10 20 30 40 50 60 70 80 90 100 TIME (μs) 1117 G07 –0.5 0 10 20 30 40 50 60 70 80 90 100 TIME (μs) 1117 G09 60 OUTPUT VOLTAGE DEVIATION (mV) CIN = 1μF 40 COUT = 10μF TANTALUM IOUT = 0.1A 20 0 20 0 –20 –40 –40 5.25 4.25 3.25 20 40 60 80 100 120 140 160 180 200 TIME (μs) 1117 G10 CIN = 1μF COUT = 10μF TANTALUM IOUT = 0.1A 40 –20 INPUT VOLTAGE (V) OUTPUT VOLTAGE DEVIATION (mV) 0 LT1117-5 Line Transient Response 60 INPUT VOLTAGE (V) 0.5 1117 G08 LT1117-2.85 Line Transient Response 0 25 50 75 100 125 150 TEMPERATURE (°C) 1117 G06 LT1117-2.85 Load Transient Response 90 0 1117 G05 Adjust Pin Current ADJUST PIN CURRENT (μA) 1.0 10 LOAD CURRENT (A) RIPPLE REJECTION (dB) 80 20 VOUT = 5V CADJ = 25μF COUT = 25μF 90 Temperature Stability 2.0 OUTPUT VOLTAGE CHANGE (%) LT1117 Ripple Rejection 7.50 6.50 5.50 0 20 40 60 80 100 120 140 160 180 200 TIME (μs) 1117 G11 1117fd 5 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 BLOCK DIAGRAM IN + – THERMAL LIMIT ADJ GND OUT FOR FIXED VOLTAGE DEVICE 1117 BD01 1117fd 6 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 APPLICATIONS INFORMATION The LT1117 family of 3-terminal regulators are easy to use. They are protected against short circuit and thermal overloads. Thermal protection circuitry will shut down the regulator should the junction temperature exceed 165°C at the sense point. These regulators are pin compatible with older 3-terminal adjustable regulators, offer lower dropout voltage and more precise reference tolerance. Reference stability over temperature is improved over older types of regulators. Stability The LT1117 family of regulators requires an output capacitor as part of the device frequency compensation. A minimum of 10μF of tantalum or 50μF of aluminum electrolytic is required. The ESR of the output capacitor should be less than 0.5Ω. Surface mount tantalum capacitors, which have very low ESR, are available from several manufacturers. When using the LT1117 adjustable device, the adjust terminal can be bypassed to improve ripple rejection. When the adjust terminal is bypassed, the required value of the output capacitor increases. The device will require an output capacitor of 22μF tantalum or 150μF aluminum electrolytic when the adjust pin is bypassed. Normally, capacitor values on the order of 100μF are used in the output of many regulators to ensure good load transient response with large load current changes. Output capacitance can be increased without limit and larger values of output capacitance further improve stability and transient response. Protection Diodes In normal operation, the LT1117 family does not need any protection diodes. Older adjustable regulators required protection diodes between the adjust pin and the output and between the output and input to prevent over stressing the die. The internal current paths on the LT1117 adjust pin are limited by internal resistors. Therefore, even with capacitors on the adjust pin, no protection diode is needed to ensure device safety under short-circuit conditions. The adjust pin can be driven, on a transient basis, ± 25V with respect to the output without any device degradation. Diodes between input and output are not usually needed. The internal diode between the output and input pins of the device can withstand microsecond surge currents of 10A to 20A. Normal power supply cycling can not generate currents of this magnitude. Only with extremely large output capacitors, such as 1000μF and larger, and with the input pin instantaneously shorted to ground can damage occur. A crowbar circuit at the input of the LT1117 in combination with a large output capacitor could generate currents large enough to cause damage. In this case a diode from output to input is recommended, as shown in Figure 1. D1 1N4002 (OPTIONAL) LT1117 VIN IN OUT ADJ + + R1 CADJ 10μF VOUT COUT 150μF R2 1117 F01 Figure 1 1117fd 7 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 APPLICATIONS INFORMATION Output Voltage The LT1117 develops a 1.25V reference voltage between the output and the adjust terminal (see Figure 2). By placing a resistor between these two terminals, a constant current is caused to flow through R1 and down through R2 to set the overall output voltage. Normally this current is chosen to be the specified minimum load current of 10mA. Because IADJ is very small and constant when compared to the current through R1, it represents a small error and can usually be ignored. For fixed voltage devices R1 and R2 are included in the device. RP PARASITIC LINE RESISTANCE LT1117 VIN IN OUT ADJ R1 CONNECT R1 TO CASE RL R2 1117 F03 CONNECT R2 TO LOAD Figure 3. Connections for Best Load Regulation LT1117 VIN IN + VOUT OUT ADJ VREF R1 IADJ 50μA R2 VOUT = VREF 1 + — + IADJ R2 R1 For fixed voltage devices the top of R1 is internally Kelvin connected, and the ground pin can be used for negative side sensing. R2 Thermal Considerations 1117 F02 Figure 2. Basic Adjustable Regulator Load Regulation Because the LT1117 is a 3-terminal device, it is not possible to provide true remote load sensing. Load regulation will be limited by the resistance of the wire connecting the regulator to the load. The data sheet specification for load regulation is measured at the output pin of the device. Negative side sensing is a true Kelvin connection, with the bottom of the output divider returned to the negative side of the load. Although it may not be immediately obvious, best load regulation is obtained when the top of the resistor divider (R1) is returned directly to the output pin of the device, not to the load. This is illustrated in Figure 3. Connected as shown, RP is not multiplied by the divider ratio. If R1 were connected to the load, the effective resistance between the regulator and the load would be: RP × LT1117 series regulators have internal thermal limiting circuitry designed to protect the device during overload conditions. For continuous normal load conditions however, the maximum junction temperature rating of 125°C must not be exceeded. It is important to give careful consideration to all sources of thermal resistance from junction to ambient. For the SOT-223 package, which is designed to be surface mounted, additional heat sources mounted near the device must also be considered. Heat sinking is accomplished using the heat spreading capability of the PC board and its copper traces. The thermal resistance of the LT1117 is 15°C/W from the junction to the tab. Thermal resistances from tab to ambient can be as low as 30°C/W. The total thermal resistance from junction to ambient can be as low as 45°C/W. This requires a reasonable sized PC board with at least one layer of copper to spread the heat across the board and couple it into the surrounding air. R2+R1 ,RP = Parasitic Line Resistance R1 1117fd 8 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 APPLICATIONS INFORMATION Experiments have shown that the heat spreading copper layer does not need to be electrically connected to the tab of the device. The PC material can be very effective at transmitting heat between the pad area, attached to the tab of the device, and a ground plane layer either inside or on the opposite side of the board. Although the actual thermal resistance of the PC material is high, the Length/ Area ratio of the thermal resistor between layers is small. The data in Table 1 was taken using 1/16" FR-4 board with 1oz. copper foil. It can be used as a rough guideline in estimating thermal resistance. Table 1. COPPER AREA TOPSIDE* BACKSIDE THERMAL RESISTANCE BOARD AREA (JUNCTION-TO-AMBIENT) 2500 Sq. mm 2500 Sq. mm 2500 Sq. mm 45°C/W 1000 Sq. mm 2500 Sq. mm 2500 Sq. mm 45°C/W 225 Sq. mm 2500 Sq. mm 2500 Sq. mm 53°C/W 100 Sq. mm 2500 Sq. mm 2500 Sq. mm 59°C/W 1000 Sq. mm 1000 Sq. mm 1000 Sq. mm 52°C/W 1000 Sq. mm 0 1000 Sq. mm 55°C/W * Tab of device attached to topside copper The thermal resistance for each application will be affected by thermal interactions with other components on the board. Some experimentation will be necessary to determine the actual value. The power dissipation of the LT1117 is equal to: PD = ( VIN – VOUT )( IOUT ) Maximum junction temperature will be equal to: TJ = TA(MAX) + PD (Thermal Resistance (junction-toambient)) Maximum junction temperature must not exceed 125°C. Ripple Rejection The curves for Ripple Rejection were generated using an adjustable device with the adjust pin bypassed. These curves will hold true for all values of output voltage. For proper bypassing, and ripple rejection approaching the values shown, the impedance of the adjust pin capacitor, at the ripple frequency, should be < R1. R1 is normally in the range of 100Ω to 200Ω. The size of the required adjust pin capacitor is a function of the input ripple frequency. At 120Hz, with R1 = 100Ω, the adjust pin capacitor should be >13μF. At 10kHz only 0.16μF is needed. For fixed voltage devices, and adjustable devices without an adjust pin capacitor, the output ripple will increase as the ratio of the output voltage to the reference voltage (VOUT/VREF). For example, with the output voltage equal to 5V, the output ripple will be increased by the ratio of 5V/1.25V. It will increase by a factor of four. Ripple rejection will be degraded by 12dB from the value shown on the curve. 1117fd 9 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 TYPICAL APPLICATIONS 1.2V to 10V Adjustable Regulator 5V Regulator with Shutdown LT1117 LT1117 VIN IN VOUT† OUT R1 121Ω ADJ + IN 121Ω 1% 10μF C2 100μF R2 1k 5V OUT ADJ + + C1* 10μF VIN + 100μF 1k 2N3904 TTL 365Ω 1% 1k * NEEDED IF DEVICE IS FAR FROM FILTER CAPACITORS R2 †V — OUT = 1.25V 1 + R1 ( ) 1117 TA04 1117 TA03 Remote Sensing RP (MAX. DROP 300mV) LT1117 VIN IN OUTPUT 5V OUT ADJ VIN + 100μF 25Ω + 7 6 LM301A 1 10μF 121Ω 2 – 4 100pF 5μF + 365Ω RL 3 1k + 8 RETURN 25Ω RETURN 1117 TA05 Adjusting Output Voltage of Fixed Regulators Regulator with Reference LT1117-5 VIN > 12V IN + OUT GND 10μF LT1117-5 + 5V TO 10V 100μF 10μF + IN OUT GND + 10V 100μF 5VOUT + 10μF* VIN > 11.5V 1k LT1029 1117 TA07 * OPTIONAL IMPROVES RIPPLE REJECTION 1117 TA06 1117fd 10 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 TYPICAL APPLICATIONS Battery Charger LT1117 VIN Battery Backed Up Regulated Supply LT1117-5 IF OUT IN VOUT RS 1.25V VIN IN + GND 10μF ADJ R1 50Ω ( ) ( ) R2 VOUT – 1.25V 1 + — R1 IF = R2 –RS 1 + — R1 ΔIF = ΔVOUT SELECT FOR CHARGE RATE 1 ( ) R2 –RS 1 + — R1 + IN OUT GND 10μF + 100μF 1117 TA09 1117 TA08 Automatic Light Control LT1117 LT1117 10μF LT1117-5 IN + 6.5V Improving Ripple Rejection VIN 5.2V LINE 5.0V BATTERY OUT OUT ADJ * C1 IMPROVES RIPPLE REJECTION. XC SHOULD BE ≈ R1 AT RIPPLE FREQUENCY R2 365Ω 1% 5V R1 121Ω 1% + + IN + OUT ADJ 10μF + 1.2k 100μF 150μF C1 10μF 1117 TA11 1117 TA10 High Efficiency Dual Supply FEEDBACK PATH MUR410 3.3V OUTPUT (TYPICAL) + 470μF LT1117-5 MUR410 IN + GND + +5V 0.5A OUT 470μF 10μF 1N4002 10μF 1N4002 +VIN LT1117-5 MUR410 SWITCHING REGULATOR IN OUT GND + 470μF + –5V 0.5A 1117 TA12 1117fd 11 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 TYPICAL APPLICATIONS High Efficiency Dual Linear Supply L1 285μH + MBR360 (HEAT SINK) 2N6667 Q1 (DARLINGTON) 10k LT1117-5 IN 1000μF 1k – GND 2.4k 510k LT1004-2.5 30k + MDA201 5V 0.5A OUT V+ + + 20k* + 100μF D11 1N4002 100μF D2 1N4002 30.1k* 1/2 LT1018 4700μF – 130VAC TO 90VAC L1 285μH STANCOR P-8685 (HEAT SINK) 2N6667 (DARLINGTON) IN + MBR360 10k LT1117-5 1000μF 1k 2.4k 510k 30k + MDA201 LT1004-2.5 + 20k* + + – OUT GND 30.1k* 1/2 LT1018 4700μF V– – –5V 0.5A * = 1% FILM RESISTORS MDA = MOTOROLA L1 = PULSE ENGINEERING, INC. #PE-92106 1117 TA13 Low Dropout Negative Supply LT1117-5 VIN IN + 10μF FLOATING INPUT OUT GND + 100μF VOUT = –5V 1117 TA14 1117fd 12 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 PACKAGE DESCRIPTION M Package 3-Lead Plastic DD Pak (Reference LTC DWG # 05-08-1460) .256 (6.502) .060 (1.524) TYP .060 (1.524) .390 – .415 (9.906 – 10.541) .165 – .180 (4.191 – 4.572) .045 – .055 (1.143 – 1.397) 15° .060 (1.524) .183 (4.648) .330 – .370 (8.382 – 9.398) +.008 .004 –.004 +0.203 0.102 –0.102 ( .059 (1.499) ) .095 – .115 (2.413 – 2.921) .075 (1.905) .300 (7.620) +.012 .143 –.020 +0.305 3.632 –0.508 ( BOTTOM VIEW OF DD PAK HATCHED AREA IS SOLDER PLATED COPPER HEAT SINK .050 (1.270) .100 (2.54) BSC ) .013 – .023 (0.330 – 0.584) .050 ± .012 (1.270 ± 0.305) .420 .080 .420 .276 .325 .350 .205 .565 .565 .320 .090 .100 .070 RECOMMENDED SOLDER PAD LAYOUT .090 .100 M (DD3) 0204 .070 RECOMMENDED SOLDER PAD LAYOUT FOR THICKER SOLDER PASTE APPLICATIONS NOTE: 1. DIMENSIONS IN INCH/(MILLIMETER) 2. DRAWING NOT TO SCALE 1117fd 13 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 PACKAGE DESCRIPTION ST Package 3-Lead Plastic SOT-223 (Reference LTC DWG # 05-08-1630) .248 – .264 (6.30 – 6.71) .129 MAX .114 – .124 (2.90 – 3.15) .059 MAX .264 – .287 (6.70 – 7.30) .248 BSC .130 – .146 (3.30 – 3.71) .039 MAX .059 MAX .181 MAX .033 – .041 (0.84 – 1.04) .0905 (2.30) BSC RECOMMENDED SOLDER PAD LAYOUT 10° – 16° .010 – .014 (0.25 – 0.36) 10° MAX .071 (1.80) MAX .090 BSC 10° – 16° .024 – .033 (0.60 – 0.84) .181 (4.60) BSC .012 (0.31) MIN .0008 – .0040 (0.0203 – 0.1016) ST3 (SOT-233) 0502 1117fd 14 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 REVISION HISTORY (Revision history begins at Rev D) REV DATE DESCRIPTION PAGE NUMBER D 4/10 Updated DD-Pak part markings in Order Information section and revised all other sections. 1 to 16 1117fd Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. 15 LT1117/LT1117-2.85 LT1117-3.3/LT1117-5 TYPICAL APPLICATION High Efficiency Regulator LT1117 1mH 28V INPUT IN + MR1122 10k ADJ 10,000μF OUTPUT OUT 240Ω 470Ω 28V 1k 1N914 2k OUTPUT ADJUST + 100μF 1M 4N28 10k + LT1011 10k – 28V 1N914 1117 TA15 RELATED PARTS PART NUMBER DESCRIPTION COMMENTS LT1118 Low IQ, Low Dropout, 800mA, Source and Sink Regulators Sources and Sinks Current, 600mA Quiescent Current, Dropout Voltage: 1V, SOIC-8 and SOT-223 Packages LT1129 700mA Micropower Low Dropout Regulator 50μA Quiescent Current LT1763 500mA, Low Noise LDO 300mV Dropout Voltage, Low Noise: 20μVRMS, VIN = 1.8V to 20V, SO-8 Package LT1764, LT1764A 3A, Fast Transient Response, Low Noise LDO 340mV Dropout Voltage, Low Noise: 40μVRMS, VIN = 2.7V to 20V, TO-220 and DD Packages “A” version stable also with ceramic caps LT1963, LT1763A 1.5A Low Noise, Fast Transient Response 340mV Dropout Voltage, Low Noise: 40μVRMS, VIN = 2.5V to 20V, “A” version stable LDO with ceramic caps, TO-220, DD, SOT-223 and SO-8 Packages LT1965 1.1A, Low Noise, Low Dropout Linear Regulator 290mV Dropout Voltage, Low Noise: 40μVRMS, VIN: 1.8V to 20V, VOUT: 1.2V to 19.5V, stable with ceramic caps, TO-220, DDPak, MSOP and 3 × 3 DFN Packages LT3021 500mA, Low Voltage, VLDO Linear Regulator VIN: 0.9V to 10V, Dropout Voltage: 160mV Typical, Adjustable Output (VREF = VOUT(MIN) = 200mV), Fixed Output Voltages: 1.2V, 1.5V, 1.8V, Stable with Low ESR, Ceramic Output Capacitors 16-Pin DFN (5mm × 5mm) and 8-Lead SO Packages LT3080, LT3080-1 1.1A, Parallelable, Low Noise, Low Dropout Linear Regulator 300mV Dropout Voltage (2-supply operation), Low Noise: 40μVRMS, VIN: 1.2V to 36V, VOUT: 0V to 35.7V, current-based reference with 1-resistor VOUT set; directly parallelable (no op amp required), stable with ceramic caps, TO-220, SOT-223, MS8E and 3 × 3 DFN-8 Packages; “-1” version has integrated internal ballast resistor LT3085 500mA, Parallelable, Low Noise, Low Dropout Linear Regulator 275mV Dropout Voltage (2-supply operation), Low Noise: 40μVRMS, VIN: 1.2V to 36V, VOUT: 0V to 35.7V, current-based reference with 1-resistor VOUT set; directly parallelable (no op amp required), stable with ceramic caps, MS8E and 2 × 3 DFN-6 packages LTC3025-1, LTC3025-2, 500mA Micropower VLDO Linear LTC3025-3, LTC3025-4 Regulator in 2 × 2 DFN VIN = 0.9V to 5.5V, Dropout Voltage: 75mV, Low Noise 80μVRMS, Low IQ: 54μA, Fixed Output: 1.2V (LTC3025-2), 1.5V (LTC3025-3), 1.8V (LTC3025-4); Adjustable Output Range: 0.4V to 3.6V (LTC3025-1), 2mm × 2mm 6-Lead DFN Package LTC3026 VIN: 1.14V to 3.5V (Boost Enabled), 1.14V to 5.5V (with External 5V), VDO = 0.1V, IQ = 950μA, Stable with 10μF Ceramic Capacitors, 10-Lead MSOP-E and DFN-10 Packages 1.5A, Low Input Voltage VLDO Linear Regulator 1117fd 16 Linear Technology Corporation LT 0410 REV D• PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com © LINEAR TECHNOLOGY CORPORATION 1993