19-3878; Rev 2; 2/08 KIT ATION EVALU E L B AVAILA 45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Features The MAX5086 high-voltage linear regulator operates from a 6.5V to 45V input voltage and delivers up to a 250mA output current. The device consumes only 70A of quiescent current with no load and 13A in shutdown. The device includes a SET input, that when connected to ground, selects a preset output voltage of 3.3V (MAX5086A) or 5.0V (MAX5086B). Alternatively, the output voltage can be adjusted from 2.5V to 11V by simply connecting SET to the regulator's output through a resistive divider network. The MAX5086 also provides an open-drain, active-low microprocessor reset output that asserts when the regulator output drops below the preset output voltage threshold. An external capacitor programs the reset timeout period. Other features include an enable input, thermal shutdown, and shortcircuit protection. The MAX5086 operates over the automotive temperature range of -40C to +125C and is available in a 16-pin TQFN thermally enhanced package. Wide Operating Input Voltage Range (6.5V to 45V) Thermally Enhanced Package Dissipates 2.6W at TA = +70C (16-Pin TQFN) Guaranteed 250mA Output Current 70A Quiescent Supply Current Preset 3.3V, 5.0V, or Adjustable 2.5V to 11V Output Voltage Remote Load Sense Integrated Microprocessor Reset Circuit with Programmable Timeout Period Thermal and Short-Circuit Protection -40C to +125C Operating Temperature Range Ordering Information PINPACKAGE PART MAX5086AATE+ PKG CODE 16 TQFN-EP* 3.3 T1655-2 T1655-2 16 TQFN-EP* 3.3 MAX5086BATE+ 16 TQFN-EP* 5.0 T1655-2 MAX5086BATE 16 TQFN-EP* 5.0 T1655-2 MAX5086AATE Applications OUTPUT VOLTAGE (V) Note: All devices are specified over the -40C to +125C oper- Automotive Industrial Home Security/Safety ating temperature range. +Denotes lead-free package. *EP = Exposed paddle. Networking Pin Configuration 14 N.C. 15 N.C. 16 CT RESET SET 9 MAX5086 1 N.C. + 10 2 3 4 IN N.C. 11 IN 13 12 EN N.C. N.C. TOP VIEW 8 GND 7 OUTSENSE 6 OUT 5 OUT TQFN ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com. 1 MAX5086 General Description MAX5086 45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay ABSOLUTE MAXIMUM RATINGS Continuous Power Dissipation (TA = +70C) 16-Pin TQFN (derate 33.3mW/C above +70C) .......2666mW Thermal Resistance (Note 1): (JA, 16-Pin TQFN)....................................................30.0C/W (JC, 16-Pin TQFN).........................................................2C/W Operating Temperature Range .........................-40C to +125C Junction Temperature ......................................................+150C Storage Temperature Range .............................-60C to +150C Lead Temperature (soldering, 10s) .................................+300C IN to GND (do not exceed package power dissipation)...............................-0.3V to +50V IN to GND (T 300ms, IOUT 250mA) ..................-0.3V to +42V EN to GND..............................................................-0.3V to +50V RESET, OUT, OUTSENSE to GND .........................-0.3V to +12V CT, SET to GND.....................................................-0.3V to +3.5V IN to OUT................................................................-0.3V to +50V Short-Circuit Duration (VIN < 16V) .............................Continuous Maximum Current into Any Pin (except IN, OUT).............20mA Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7 using a four-layer board. For detailed information on thermal considerations, refer to www.maxim-ic.com/thermal-tutorial. Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. ELECTRICAL CHARACTERISTICS (VIN = 14V, IOUT = 1mA, CIN = 47F (low ESR), COUT = 15F, VEN = 2.4V, 10k from RESET to OUT, TA = TJ = -40C to +125C, unless otherwise noted. Typical specifications are at TA = +25C.) (Note 2) PARAMETER Input Voltage Range Supply Current Shutdown Supply Current SYMBOL CONDITIONS VIN VIN VOUT + 1.5V IQ Measured at GND, SET = GND ISHDN MIN TYP MAX UNITS 45 V 70 115 6.5 IOUT = 0 IOUT = 250mA 1250 VEN 0.4V 13 21 A A REGULATOR Guaranteed Output Current IOUT VIN = 6.5V, VOUT = 5.0V SET = GND, 5V Version Output Voltage (Note 3) VOUT SET = GND, 3.3V version VDO Startup Response Time (Note 5) Line Regulation VOUT / VIN Enable Voltage VEN 2 mA 6.5V VIN 25V, 5mA IOUT 250mA 4.85 5 5.15 6.5V VIN 45V, 5mA IOUT 100mA 4.85 5 5.15 6.5V VIN 25V, 5mA IOUT 250mA 3.217 3.3 3.392 6.5V VIN 45V, 5mA IOUT 100mA 3.217 3.3 3.392 IOUT = 5mA, adjustable range Dropout Voltage (Note 4) 250 2.5 11.0 IOUT = 250mA, VOUT = 5V 0.9 Rising edge of VIN to VOUT, RL = 500, SET = GND 400 6.5V VIN 45V 5V version 3.3V version VEN = high, regulator on V 2.2 s -1 +1 -0.5 +0.8 2.4 VEN = low, regulator off _______________________________________________________________________________________ V 0.4 mV/V V 45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay (VIN = 14V, IOUT = 1mA, CIN = 47F (low ESR), COUT = 15F, VEN = 2.4V, 10k from RESET to OUT, TA = TJ = -40C to +125C, unless otherwise noted. Typical specifications are at TA = +25C.) (Note 2) PARAMETER Enable Input Current SYMBOL IEN CONDITIONS MIN TYP VEN = 2.4V 0.38 VEN = 14V 3.75 MAX UNITS A SET Reference Voltage VSET 1.20 1.235 1.26 V SET Input Leakage Current ISET -100 -1.5 100 nA 0.045 0.4 VOUT / IOUT Load Regulation Power-Supply Rejection Ratio Short-Circuit Current (Note 6) Thermal Shutdown Temperature Thermal Shutdown Hysteresis PSRR ISC IOUT = 1mA to 250mA IOUT = 10mA, f = 100Hz, 500mVP-P, VOUT = 5V VIN < 16V TJ(SHDN) TJ(SHDN) -54 dB 440 mA 175 C 25 C RESET Voltage Threshold VRESET RESET Threshold Hysteresis VRHYST RESET Output Low Voltage VRL ISINK = 1mA 0.4 V RESET Output Leakage Current IRH VRESET = 5V 1 A 89.91 92 94.10 2 % VOUT % VOUT RESET Output Minimum Timeout Period When VOUT reaches RESET threshold, CCT = Open 15 s ENABLE to RESET Minimum Timeout Period When EN goes high, CCT = open 169 s Delay Comparator Threshold (Rising) 1.196 Delay Comparator Threshold Hysteresis CT Charge Current 1.264 100 1 CT Discharge Current Note 2: Note 3: Note 4: Note 5: Note 6: 1.23 2.26 V mV 4 5 A mA Limits at -40C are guaranteed by design. Output voltage is tested using a pulsed load current of less than 50ms duration. Dropout voltage is defined as (VIN - VOUT) when VOUT is 100mV below the value of VOUT for VIN = VOUT + 3V. Startup time measured from 50% of VIN to 90% of VOUT. Continuous short-circuit protection for VIN > 16V not guaranteed. _______________________________________________________________________________________ 3 MAX5086 ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (VIN = VEN = 14V, CIN = 47F (low ESR), COUT = 15F, VOUT = 5V, SET = GND, TA = +25C, unless otherwise specified.) NO-LOAD SUPPLY CURRENT vs. TEMPERATURE 5.0 4.5 140 16 3.0 2.5 80 2.0 60 1.5 40 1.0 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 -40 -25 -10 5 20 35 50 65 80 95 110 125 140 VIN (V) TEMPERATURE (C) TEMPERATURE (C) OUTPUT VOLTAGE vs. TEMPERATURE GROUND CURRENT vs. TEMPERATURE OUTPUT VOLTAGE vs. LOAD CURRENT AND TEMPERATURE 15 20 25 30 35 40 45 3.0 MAX5086 toc04 5.25 5.20 5.15 VIN = +6.5V 2.5 5.10 IGND (mA) 5.00 4.95 IOUT = 50mA IOUT = 250mA 1.5 4.85 5.00 4.90 IOUT = 250mA 4.85 4.80 IOUT = 5mA 4.75 5.05 IOUT = 50mA IOUT = 100mA 4.95 0.5 4.80 VIN = +6.5V 5.15 5.10 1.0 4.90 5.20 IOUT = 100mA 2.0 5.05 5.25 MAX5086 toc06 10 VOUT (V) 5 8 2 MAX5086 toc05 0 10 4 0 0 12 6 VIN = +6.5V 20 IOUT = 0 0.5 14 VIN = +14V VIN = +45V 100 ISHDN (A) IGND (A) 4.75 0 -40 -25 -10 5 20 35 50 65 80 95 110 125 140 -40 -25 -10 5 20 35 50 65 80 95 110 125 140 -40 -25 -10 5 20 35 50 65 80 95 110 125 140 TEMPERATURE (C) TEMPERATURE (C) TEMPERATURE (C) DROPOUT VOLTAGE vs. LOAD CURRENT POWER-SUPPLY REJECTION RATIO vs. FREQUENCY LOAD-TRANSIENT RESPONSE 1.35 1.20 MAX5086 toc09 0 MAX5086 toc07 1.50 MAX5086 toc08 VOUT (V) 3.5 VOUT (V) 18 120 4.0 COUT = 15F IOUT = 10mA -10 -20 1.05 PSRR (dB) 0.90 0.75 0.60 0.45 0.30 VOUT 200mV/div -30 -40 -50 IOUT 250mA -60 5mA -70 0.15 VOUT = +5V 0 -80 0 25 50 75 100 125 150 175 200 225 250 IOUT (mA) 4 20 MAX5086 toc02 160 MAX5086 toc01 5.5 SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE MAX5086 toc03 OUTPUT VOLTAGE vs. INPUT VOLTAGE VDROPOUT (V) MAX5086 45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay 0.1 1 10 100 1000 400s/div FREQUENCY (kHz) _______________________________________________________________________________________ 45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay INPUT VOLTAGE STEP RESPONSE ENABLE STARTUP RESPONSE STARTUP RESPONSE MAX5086 toc10 MAX5086 toc12 MAX5086 toc11 IOUT = 50mA IOUT = 5mA VOUT AC-COUPLED 500mV/div 0V EN 1V/div VOUT 2V/div 0V 0V 26V VIN 10V/div 6.5V VOUT 2V/div VIN 10V/div 0V 0V 400s/div 100s/div 400s/div ENABLE STARTUP RESPONSE ENABLE STARTUP RESPONSE ENABLE STARTUP RESPONSE MAX5086 toc13 MAX5086 toc15 MAX5086 toc14 EN 1V/div EN 1V/div EN 1V/div 0V 0V 0V VOUT 2V/div VIN = 45V IOUT = 0 0V SHUTDOWN RESPONSE MAX5086 toc16 100s/div 100s/div GROUND CURRENT DISTRIBUTION (TA = -40C) GROUND CURRENT DISTRIBUTION (TA = +125C) 40 138 UNITS TESTED IOUT = 5mA 35 EN 1V/div 25 20 15 25 20 15 10 10 5 5 0 0 20ms/div 138 UNITS TESTED 35 NUMBER OF UNITS VOUT 2V/div 40 30 30 NUMBER OF UNITS 0V VIN = 45V IOUT = 250mA 0V MAX5086 toc17 100s/div 0V VOUT 2V/div VOUT 2V/div VIN = 14V IOUT = 250mA 0V VIN = 14V IOUT = 0 0V MAX5086 toc18 0V 64 65 66 67 68 69 70 71 72 73 74 65 66 67 68 69 70 71 72 73 74 IGND (A) IGND (A) _______________________________________________________________________________________ 5 MAX5086 Typical Operating Characteristics (continued) (VIN = VEN = 14V, CIN = 47F (low ESR), COUT = 15F, VOUT = 5V, SET = GND, TA = +25C, unless otherwise specified.) 45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay MAX5086 Pin Description 6 PIN NAME 1, 12-16 N.C. FUNCTION No Connection. Not internally connected. 2 EN Enable Input. Drive EN high to turn on the regulator. Force EN low to place the device in shutdown mode. 3, 4 IN Regulator Input. Supply voltage ranges from 6.5V to 45V. Bypass IN to GND with a low ESR 47F capacitor (electrolytic 50VL). 5, 6 OUT 7 OUTSENSE 8 GND Ground 9 SET Feedback Regulation Set Point. Connect SET to GND for a fixed 3.3V output (MAX5086A) or 5.0V output (MAX5086B). Connect an external resistive divider network from OUTSENSE to SET to GND to adjust the output voltage from 2.5V to 11V. 10 RESET 11 CT Reset Timeout Setting Connection. A 2A charging current is available at CT. Connect a capacitor from CT to GND to set the reset timeout period (see the Adjustable Reset Timeout Period (CT) section). EP EP Exposed Pad. Connect externally to a large ground plane to aid heat dissipation. Do not use EP as the only ground connection. Regulator Output. Connect at least a 15F low-ESR capacitor from OUT to GND. Regulator Output Feedback Point. OUTSENSE must be connected to OUT for fixed output voltage versions. Leave OUTSENSE open circuit for adjustable output voltage version. Open-Drain Active-Low Reset Output. Connect a 10k pullup resistor from RESET to any supply voltage up to 11V to create a logic output. _______________________________________________________________________________________ 45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay MAX5086 IN ERROR AMPLIFIER MAX5086 OUT VREF CONTROL LOGIC, THERMAL SHUTDOWN, AND OVERCURRENT PROTECTION OUTSENSE MUX EN INTERNAL SUPPLY VOLTAGE SET 2A CT DELAY COMPARATOR CT COMPARATOR RESET 0.92 x VREF GND Figure 1. Functional Diagram _______________________________________________________________________________________ 7 MAX5086 45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Detailed Description The MAX5086 high-voltage linear regulator includes an integrated microprocessor reset circuit with an adjustable reset timeout period (see the Adjustable Reset Timeout Period (CT) section). The device guarantees a 250mA load current and is available with a preset output voltage of 3.3V (MAX5086A) or 5V (MAX5086B). Both devices can be configured to provide an adjustable output voltage from 2.5V to 11V. The internal reset circuit monitors the regulator output voltage and asserts RESET low when the regulator output falls below the reset threshold voltage. Other features include an enable (regulator control input), 21A (max) shutdown current, short-circuit protection (see the Output Short-Circuit Current Limit section), and thermal shutdown (see the Thermal Protection section). 6.5V TO 45V 2.5V TO 11V OUT IN 15F 47F R1 MAX5086 ON EN OFF OUTSENSE TO P RESET SET CT CCT R3 GND R2 VOUT = VSET (1 + R1/R2) VSET = 1.23V Regulator The MAX5086 accepts an input voltage range from 6.5V to 45V and offers a fixed output voltage of 3.3V or 5V. For an adjustable output voltage operation, use an external resistive divider network connected between OUT, SET, and GND (see Figure 2). Enable Input (EN) EN is a logic-level enable input that turns ON/OFF the device. Drive EN high to turn on the device and drive EN low to place the device in shutdown. The MAX5086 draws 13A (typ) of supply current when in shutdown. EN withstands voltages up to +45V, allowing EN to be connected to IN for an always-on operation. Remote Sensing (OUTSENSE) For fixed output voltage versions, OUTSENSE must be used for load voltage sensing. Leave OUTSENSE open circuit when using adjustable output voltage version. Reset Output (RESET) A supervisor circuit is fully integrated in the MAX5086 and uses the same reference voltage as the regulator. RESET goes low if VOUT drops below the preset output voltage threshold, and remains low at least for the timeout period after VOUT rises above the reset voltage threshold. 8 Figure 2. Setting the Adjustable Output Voltage Adjustable Reset Timeout Period (CT) The MAX5086 features a user-adjustable reset timeout. Connect a capacitor from CT to GND to set the reset timeout period (see Figure 2) and use the following equation to calculate the timeout period: tRP = CCT x 0.6175 x 106 where CCT is the value of the external capacitor connected from CT to GND and tRP is in seconds. Thermal Protection When the junction temperature exceeds TJ = 175C an internal thermal sensor signals the shutdown logic, which turns off the pass transistor, allowing the IC to cool. The thermal sensor turns the pass transistor on again after the IC's junction temperature cools by 25C, resulting in a cycled output during continuous thermaloverload conditions. Thermal protection protects the MAX5086 in the event of fault conditions. During continuous operation, do not exceed the absolute maximum junction temperature rating of TJ = +150C. Output Short-Circuit Current Limit The MAX5086 features a current limit. The output can be shorted to GND for an indefinite period of time (for VIN < 16V) without damage to the device. _______________________________________________________________________________________ 45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay MAXIMUM POWER DISSIPATION vs. TEMPERATURE Output Voltage Selection MAX5086 fig03 4.0 3.5 3.0 2.5 PD (W) The MAX5086 features dual-mode operation, in either a preset voltage mode or an adjustable mode. In preset voltage mode, internal feedback resistors set the MAX5086's output voltage to +3.3V or +5V. Select preset voltage mode by connecting SET to ground. In adjustable mode, select an output between +2.5V and +11V using two external resistors connected as a voltage-divider to SET (Figure 2). Set the output voltage using the following equation: MAX5086 Applications Information 2.666W 2.0 1.5 DERATE 33.3mW/C 1.0 R1 VOUT = VSET x 1 + R2 0.5 0 0 20 40 where VSET = 1.23V and R2 is chosen to be approximately 100k. Available Output Current Calculation The MAX5086 high-voltage regulator provides up to 250mA of output current. The input voltage extends to +45V. Package power dissipation limits the amount of output current available for a given input/output voltage and ambient temperature. Figure 3 depicts the maximum power dissipation curve for these devices. The graph assumes that the exposed pad of the MAX5086 package is set up per JEDEC specifications. Use Figure 3 to determine the allowable package dissipation (P D ) for a given ambient temperature. Alternately, use the following formula to calculate the allowable package dissipation: 2.666W for TA + 70C W PD = 2.666W - 0.0333 x (TA - 70C) C For + 70C < TA + 125C 60 80 100 120 140 TEMPERATURE (C) Figure 3. Calculated Maximum Power Dissipation vs. Temperature Example 1: TA = +85C VIN = +14V VOUT = +5V Find the maximum allowable output current. First calculate package dissipation at the given temperature as follows: PD = 2.666W - 0.0333 W (85C - 70C) = 2.1665W C Then determine the maximum output current: IOUT(MAX) = (2.1665W) = 271mA (14V) - (5V) After determining the allowable package dissipation calculate the maximum output current using the following formula: IOUT(MAX) PD 250mA VIN - VOUT The above equations do not include the negligible power dissipation from self-heating due to the IC ground current. _______________________________________________________________________________________ 9 Example 2: TA = +125C VIN = +14V VOUT = +5V Calculate package dissipation at the given temperature as follows: PD = 2.666W - 0.0333 W (125C - 70C) = 0.8345W C And establish the maximum current: IOUT(MAX) = (0.8345W) = 92mA (14V) - (5V) 0.30 VOUT = +5V 0.25 MAX5086 fig04 MAXIMUM OUTPUT CURRENT vs. INPUT VOLTAGE IOUT(MAX) (A) MAX5086 45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay TA = +70C TA = +85C TA = +125C 0.20 0.15 0.10 0.05 0 0 Example 3: TA = +50C PD = 2.666W And find the maximum output current: (2.666W) = 296mA IOUT(MAX) = 250mA (14V) - (5V) In Example 3, the maximum output current is calculated as 296mA, however, the maximum output current cannot exceed 250mA. Use Figure 4 to quickly determine maximum allowable output current for selected ambient temperatures. Output Capacitor Selection and Regulator Stability For stable operation over the full temperature range and with load currents up to 250mA, use a 15F (min) 10 10 15 20 25 30 35 40 45 VIN (V) VIN = +14V VOUT = +5V Calculate package dissipation at the given temperature as follows: IOUT(MAX) = 5 Figure 4. Maximum Output Current vs. Input Voltage output capacitor with an ESR < 0.25. To reduce noise and improve load-transient response, stability, and power-supply rejection, use larger output capacitor values such as 22F. Some ceramic capacitor dielectrics exhibit large capacitance and ESR variation with temperature. For capacitor dielectrics such as Y5V, use 22F or more to ensure stability at temperatures below -10C. With X7R or X5R dielectrics, 15F should be sufficient at all operating temperatures. To improve power supply rejection and transient response, use a minimum 47F low ESR capacitor from IN to GND. Chip Information TRANSISTOR COUNT: 1386 PROCESS: BiCMOS ______________________________________________________________________________________ 45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay QFN THIN.EPS ______________________________________________________________________________________ 11 MAX5086 Package Information (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) MAX5086 45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information, go to www.maxim-ic.com/packages.) 12 ______________________________________________________________________________________ 45V, 250mA, Low-Quiescent-Current Linear Regulator with Adjustable Reset Delay REVISION NUMBER REVISION DATE 1 7/06 Updated data sheet with improved output voltage parameters 2/08 Corrected errors in data sheet, reduced operating range, and removed unreleased product from ordering information 2 DESCRIPTION PAGES CHANGED 2 1-15 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 13 (c) 2008 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc. MAX5086 Revision History