LT3085 Adjustable 500mA Single Resistor Low Dropout Regulator FEATURES DESCRIPTION n Outputs May be Paralleled for Higher Current and The LT 3085 is a 500mA low dropout linear regulator Heat Spreading that can be paralleled to increase output current or spread n Output Current: 500mA heat on surface mounted boards. Designed as a precision n Single Resistor Programs Output Voltage current source and voltage follower, this new regulator n 1% Initial Accuracy of SET Pin Current finds use in many applications requiring high current, n Output Adjustable to 0V adjustability to zero, and no heat sink. The device also n Current Limit Constant with Temperature brings out the collector of the pass transistor to allow low n Low Output Noise: 40V (10Hz to 100kHz) RMS dropout operationdown to 275mVwhen used with a n Wide Input Voltage Range: 1.2V to 36V second supply. n Low Dropout Voltage: 275mV A key feature of the LT3085 is the capability to supply n < 1mV Load Regulation a wide output voltage range. By using a reference cur- n < 0.001%/ V Line Regulation rent through a single resistor, the output voltage is pro- n Minimum Load Current: 0.5mA grammed to any level between zero and 36V. The LT3085 n Stable with Minimum 2.2F Ceramic Capacitor is stable with 2.2F of capacitance on the output, and n Current Limit with Foldback and Overtemperature the IC uses small ceramic capacitors that do not require Protected additional ESR as is common with other regulators. n 8-Lead MSOP, and 6-Lead 2mm 3mm DFN Packages n AEC-Q100 Qualified for Automotive Applications Internal protection circuitry includes current limiting and thermal limiting. The LT3085 is offered in the 8-lead MSOP and a low profile (0.75mm) 6-lead 2mm 3mm APPLICATIONS DFN package (both with an Exposed Pad for better ther- n High Current All Surface Mount Supply mal characteristics). n High Efficiency Linear Regulator All registered trademarks and trademarks are the property of their respective owners. n Post Regulator for Switching Supplies n Low Parts Count Variable Voltage Supply n Low Output Voltage Power Supplies TYPICAL APPLICATION Variable Output Voltage 500mA Supply N = 1676 IN LT3085 V IN 1.2V TO 36V V CONTROL + 1F OUT V OUT SET 2.2F R SET V = R 10A OUT SET 9.80 9.90 10.00 10.10 10.20 3085 TA01a SET PIN CURRENT DISTRIBUTION (A) 3085 TA01b Rev. C 1 Document Feedback For more information www.analog.comLT3085 (Note 1) All Voltages Relative to V ABSOLUTE MAXIMUM RATINGS OUT V Pin Voltage ....................................40V, 0.3V Operating Junction Temperature Range (Notes 2, 10) CONTROL IN Pin Voltage ................................................40V, 0.3V E, I Grade ........................................... 40C to 125C SET Pin Current (Note 7) ..................................... 15mA MP Grade ........................................... 55C to 125C SET Pin Voltage (Relative to OUT) .......................... 10V Storage Temperature Range .................. 65C to 150C Output Short-Circuit Duration .......................... Indefinite Lead Temperature (Soldering, 10 sec) MS8E Package Only ..........................................300C PIN CONFIGURATION TOP VIEW TOP VIEW OUT 1 6 IN OUT 1 8 IN OUT 2 7 IN 9 OUT 2 7 5 IN OUT 3 6 NC SET 4 5 V CONTROL SET 3 4 V CONTROL MS8E PACKAGE 8-LEAD PLASTIC MSOP DCB PACKAGE 6-LEAD (2mm 3mm) PLASTIC DFN T = 125C, = 60C/W, = 10C/W JMAX JA JC EXPOSED PAD (PIN 9) IS OUT, MUST BE SOLDERED TO VOUT ON PCB T = 125C, = 73C/W, = 10.6C/W JMAX JA JC SEE THE APPLICATIONS INFORMATION SECTION EXPOSED PAD (PIN 7) IS OUT, MUST BE SOLDERED TO VOUT ON PCB SEE THE APPLICATIONS INFORMATION SECTION ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3085EDCB PBF LT3085EDCB TRPBF LDQQ 6-Lead (2mm 3mm) Plastic DFN 40C to 125C LT3085EMS8E PBF LT3085EMS8E TRPBF LTDQP 8-Lead Plastic MSOP 40C to 125C LT3085IDCB PBF LT3085IDCB TRPBF LDQQ 6-Lead (2mm 3mm) Plastic DFN 40C to 125C LT3085IMS8E PBF LT3085IMS8E TRPBF LTDQP 8-Lead Plastic MSOP 40C to 125C LT3085MPMS8E PBF LT3085MPMS8E TRPBF LTDWQ 8-Lead Plastic MSOP 55C to 125C LEAD BASED FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3085EDCB LT3085EDCB TR LDQQ 6-Lead (2mm 3mm) Plastic DFN 40C to 125C LT3085EMS8E LT3085EMS8E TR LTDQP 8-Lead Plastic MSOP 40C to 125C LT3085IDCB LT3085IDCB TR LDQQ 6-Lead (2mm 3mm) Plastic DFN 40C to 125C LT3085IMS8E LT3085IMS8E TR LTDQP 8-Lead Plastic MSOP 40C to 125C LT3085MPMS8E LT3085MPMS8E TR 8-Lead Plastic MSOP 55C to 125C LTDWQ AUTOMOTIVE PRODUCTS** LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3085EMS8E WPBF LT3085EMS8E WTRPBF LTDQP 8-Lead Plastic MSOP 40C to 125C LT3085IMS8E WPBF LT3085IMS8E WTRPBF LTDQP 8-Lead Plastic MSOP 40C to 125C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. **Versions of this part are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. These models are designated with a W suffix. Only the automotive grade products shown are available for use in automotive applications. Contact your local Analog Devices account representative for specific product ordering information and to obtain the specific Automotive Reliability reports for thesemodels. Rev. C 2 For more information www.analog.com