19-0657; Rev 6; 3/12 KIT ATION EVALU LE B A IL A AV Automotive Micropower Linear Regulators with Supervisor o o o o o o o o o o o o Low 31µA Quiescent Current 4V to 72V Wide Input Voltage Range 100mA Output Current Capability Dropout Voltage of 620mV with 5V Output at 100mA Fixed Output-Voltage Options: 5V, 3.3V, 2.5V, and 1.8V Watchdog Timer Option (1.6s (MAX6773/ MAX6774) and 50ms (MAX6773B/MAX6774B)) Adjustable Output Voltages from 1.8V to 11V Open-Drain or Push-Pull RESET Output Fixed or Capacitor-Adjustable Reset Timeouts Small, Thermally Enhanced 1.9W, 3mm x 3mm TDFN Package Overtemperature and Short-Circuit Protection Fully Specified from -40°C to +125°C Ordering Information TEMP RANGE PART -40°C to +125°C 6 TDFN-EP* MAX6765TT_D_/V+ -40°C to +125°C 6 TDFN-EP* Ordering Information continued at end of data sheet. The first “_” is a placeholder for the voltage output and reset threshold. The 2nd “_” designates the fixed reset-timeout option. See Tables 1 and 2 for details. For example, the MAX6765TTLD4 has a 5V output, a reset threshold of 4.65V, and a 200ms typical reset timeout. +Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive qualified part. *EP = Exposed pad. For tape-and-reel orders add a “T” after the “+” symbol to complete the part number. Tape-and-reel orders are available in 2.5k increments. Nonstandard versions require a 10k minimum order quantity. RESET TOP VIEW TIMEOUT Pin Configurations 6 5 4 MAX6765 MAX6766 The MAX6765–MAX6774B are fully specified for a -40°C to +125°C operating temperature range. EP IN 1 Typical Application Circuit and Selector Guide appear at end of data sheet. 2 3 ENABLE + GND Applications Automotive Industrial Telecom PINPACKAGE MAX6765TT_D_+ OUT The MAX6765–MAX6774B are low-quiescent-current, high-voltage linear regulators that operate from 4V to 72V and deliver up to 100mA of load current. These lowpower devices consume only 31µA of quiescent current, making them ideal for always-on automotive modules. These devices are offered with fixed standard output options of 5.0V, 3.3V, 2.5V, and 1.8V, or can be adjusted from 1.8V to 11V with two external resistors. The MAX6765–MAX6774B feature a push-pull or opendrain, active-low RESET output with either fixed or adjustable thresholds. Whenever the regulator’s output falls below the reset threshold, the RESET output asserts and remains asserted for at least the minimum reset timeout period after the output voltage exceeds its threshold. The minimum reset timeout period is offered with fixed values from 75µs to 200ms or can be adjusted externally with a small capacitor. These devices provide three regulator enable modes to accommodate several power-on schemes. The MAX6765/MAX6766/MAX6769/MAX6770/MAX6773/ MAX6773B/MAX6774/MAX6774B feature a single traditional enable input (ENABLE) to turn on and off the regulator. The MAX6771/MAX6772 provide dual enable inputs (ENABLE1 and ENABLE2) to turn on and off the regulator either through an ignition switch or a bus transceiver. The MAX6767/MAX6768 provide a hold input (HOLD) in addition to the enable input to allow for the implementation of a self-holding circuit without requiring external components. Setting HOLD low after enabling the regulator forces the regulator to remain on even if ENABLE is subsequently set low. Releasing HOLD shuts down the regulator. The MAX6773/MAX6773B/MAX6774/MAX6774B also include a watchdog input that monitors a pulse train from the microprocessor (µP) and generates a reset pulse if the watchdog input remains high or low for a duration longer than the 1.6s (typ) (MAX6773/MAX6774) or 50ms (typ) (MAX6773B/MAX6774B) watchdog timeout period. The MAX6765–MAX6774B are available in a small, thermally enhanced 3mm x 3mm TDFN package that can dissipate up to 1.951W, thereby supporting continuous regulator operation during high ambient temperatures, high battery voltage, and high load-current conditions. Features TDFN Pin Configurations continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX6765–MAX6774 General Description MAX6765–MAX6774 Automotive Micropower Linear Regulators with Supervisor ABSOLUTE MAXIMUM RATINGS (All pins referenced to GND, unless otherwise noted.) VIN ..........................................................................-0.3V to +80V OUT ................................................-0.3V to min (12V, IN + 0.3V) ENABLE, ENABLE1, ENABLE2 .....................-0.3V to (IN + 0.3V) RESET (open-drain output), TIMEOUT, WDI, RESETIN, SET ......................................................-0.3V to 12V RESET (push-pull output), HOLD ..............-0.3V to (OUT + 0.3V) Maximum Current (all pins except IN and OUT).................50mA Continuous Power Dissipation (TA = +70°C) 6-Pin TDFN 3mm x 3mm (derate 23.8mW/°C above +70°C) ...........................1904.8mW 8-Pin TDFN 3mm x 3mm (derate 24.4mW/°C above +70°C) ...........................1951.2mW Operating Temperature Range .........................-40°C to +125°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Lead Temperature (soldering, 10s) .................................+300°C Soldering Temperature (reflow) .......................................+260°C 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, CIN = 0.1µF, COUT = 10µF, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = TJ = +25°C.) (Note 1) PARAMETER Supply Voltage Range SYMBOL Supply Current (MAX6765–MAX6772) (Note 2) Supply Current (MAX6773/MAX6773B/ MAX6774/MAX6774B) (Note 2) Shutdown Supply Current CONDITIONS VIN ISHDN VOUT Adjustable Output Voltage Range VOUT SET Threshold Voltage (MAX6767–MAX6774) VSET Dual Mode™ SET Threshold TYP 4 UNITS 72 V 31 45 ILOAD = 50mA 35 50 ILOAD = 100mA, VIN = 14V 37 55 ILOAD = 0A, VIN = 42V 35 50 ILOAD = 10mA, VIN = 42V ILOAD = 0A ILOAD = 50mA ILOAD = 100mA ILOAD = 0A, VIN = 42V 37 38 42 44 42 55 50 55 60 55 ILOAD = 10mA, VIN = 42V 44 60 ENABLE , ENABLE1, ENABLE2 = GND 3.3 7 5 5.075 4.925 L/M, 1mA ≤ ILOAD ≤ 100mA, VIN = 11V 4.850 5 5.150 T/S, ILOAD = 1mA 3.251 3.3 3.350 T/S, 1mA ≤ ILOAD ≤ 100mA, VIN = 9.3V 3.201 3.3 3.399 Z/Y, ILOAD = 1mA 2.463 2.5 2.538 Z/Y, 1mA ≤ ILOAD ≤ 100mA, VIN = 8.5V 2.425 2.5 2.575 W/V, ILOAD = 1mA 1.773 1.8 1.827 W/V, 1mA ≤ ILOAD ≤ 100mA, VIN = 7.8V 1.746 1.8 1.854 1.8 ILOAD = 1mA 1.20 1.233 SET rising 116 SET falling 58 Dual Mode is a trademark of Maxim Integrated Products, Inc. 2 MAX ILOAD = 0A L/M, ILOAD = 1mA Output Voltage MIN _______________________________________________________________________________________ µA µA µA V 11.0 V 1.26 V mV Automotive Micropower Linear Regulators with Supervisor (VIN = 14V, CIN = 0.1µF, COUT = 10µF, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = TJ = +25°C.) (Note 1) PARAMETER SET Input Current (MAX6767–MAX6774) Dropout Voltage (Note 3) SYMBOL ISET ∆VDO CONDITIONS VSET = 1.5V, VIN = 11V MIN TYP -100 MAX UNITS +100 nA L/M, 5V output option, ILOAD = 10mA 60 L/M, 5V output option, ILOAD = 50mA 300 630 L/M, 5V output option, ILOAD = 100mA 620 1200 T/S, 3.3V output option, ILOAD = 100mA 866 1600 Guaranteed Output Current (Note 4) 130 100 Output Current Limit Output shorted to GND, VIN = 14V 150 Thermal-Shutdown Temperature Thermal-Shutdown Hysteresis mA 250 mA 160 °C 20 Line Regulation 6.5V ≤ VIN ≤ 72V, ILOAD = 1mA Load Regulation (MAX6767-6774) IOUT = 1mA to 100mA, VIN = VOUT(NOM) + 6V mV °C 1 % 1.5 % Power-Supply Rejection Ratio PSRR ILOAD = 10mA, fIN = 100Hz, 500mVP-P 70 dB Startup Response Time tSTART From ENABLE high to OUT, ILOAD = 100mA 180 µs Output Overvoltage Protection Threshold OVTH ISINK = 1mA (from OUT) Output Overvoltage Protection Maximum Sink Current 1.07 x VOUT OUT = OUT(NOM) x 1.15 5 1.1 x VOUT 1.13 x VOUT 10 V mA LOGIC INPUT (ENABLE, ENABLE1, ENABLE2, HOLD) Input Low Voltage VIL ENABLE, ENABLE1, ENABLE2 Input High Voltage VIH ENABLE, ENABLE1, ENABLE2 ENABLE, ENABLE1, ENABLE2 Input Pulldown Current HOLD Input Threshold Voltage HOLD Input Pullup Current 0.4 1.4 ENABLE, ENABLE1, ENABLE2 are internally pulled down to GND VIL 1.8V ≤ VOUT ≤ 11V VIH 1.8V ≤ VOUT ≤ 11V V V 0.6 µA 0.4 V OUT 0.4 HOLD is internally pulled up to OUT 1.8 µA RESET OUTPUT RESET Threshold SET = GND, RESET falling L 4.500 4.625 4.750 M 4.250 4.375 4.500 T 2.970 3.053 3.135 S 2.805 2.888 2.970 Z 2.250 2.313 2.375 Y 2.125 2.188 2.250 W 1.620 1.665 1.710 V 1.530 1.575 1.620 V _______________________________________________________________________________________ 3 MAX6765–MAX6774 ELECTRICAL CHARACTERISTICS (continued) MAX6765–MAX6774 Automotive Micropower Linear Regulators with Supervisor ELECTRICAL CHARACTERISTICS (continued) (VIN = 14V, CIN = 0.1µF, COUT = 10µF, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical values are at TA = TJ = +25°C.) (Note 1) PARAMETER SYMBOL RESET Threshold (Adjustable Output Voltage) RESETIN Input Current RESETIN Threshold CONDITIONS MIN TYP MAX L/T/Z/W, SET = resistive divider, RESET falling VOUT x 0.9 VOUT x 0.925 VOUT x 0.950 M/S/Y/V, SET = resistive divider, RESET falling VOUT x 0.85 VOUT x 0.875 VOUT x 0.900 VRESETIN = VGND or 12V -100 VTH = 87.5% of VSET (M/S/Y/V), RESET falling 1.057 1.085 1.112 VTH = 92.5% of VSET (L/T/Z/W), RESET falling 1.118 1.147 1.176 OUT to RESET Delay VOUT falling RESETIN To RESET Delay RESETIN falling VOUT rising 0.3 TIMEOUT Ramp Threshold RESET Output-Voltage Low (Open Drain or Push-Pull) VOL RESET Output-Voltage High (Push-Pull) VOH RESET Open-Drain Leakage Current µs µs 3.125 4.063 D2 8.75 12.5 16.25 D3 35 50 65 D4 140 200 260 800 1000 1200 L/M/T/S options 1.160 1.220 1.259 V/W/Y/Z options 1.060 1.170 1.242 VOUT ≥ 1.8V, ISINK = 50µA, RESET asserted 0.3 VOUT ≥ 1.8V, ISINK = 3.2mA, RESET asserted 0.4 tWDI 1.8V ≤ VOUT ≤ 11V Watchdog Input Low Voltage VIL 1.8V ≤ VOUT ≤ 11V Watchdog Input High Voltage VIH 1.8V ≤ VOUT ≤ 11V Watchdog Input Low Voltage VIL 1.8V ≤ VOUT ≤ 11V Watchdog Input Current IWDI VWDI = 0V or VWDI = 12V tWD MAX6773/MAX6774 MAX6773B/MAX6774B ms nA V V 0.8 x VOUT V RESET not asserted, RESET = 12V Watchdog Minimum Input Pulse Watchdog Timeout Period 35 75 2.187 VOUT ≥ 1.8V, ISOURCE = 250µA, RESET not asserted nA µs D1 TIMEOUT Ramp Current V V D0 RESET Timeout Period (TIMEOUT Connected to OUT) +100 UNITS 100 1 nA µs 0.4 VOUT - 0.4V V V -1 0.4 V +1 µA 1.12 1.6 2.08 s 40 50 60 ms Note 1: Production tested at TA = +25°C. Overtemperature limits are guaranteed by design. Note 2: Device tested at internally set voltage. Note 3: Dropout voltage for L/M versions is defined as (VIN - VOUT) when VOUT equals 98% of the nominal value of VOUT when VIN = 11V. For T/S versions, dropout voltage is defined as (VIN - VOUT) when VOUT equals 98% of the nominal value of VOUT when VIN = 9.3V. Note 4: Observe the absolute maximum power dissipation limits. 4 _______________________________________________________________________________________ Automotive Micropower Linear Regulators with Supervisor 34 ILOAD = 0 30 41 ILOAD = 50mA 37 35 ILOAD = 1mA 33 28 31 26 29 ILOAD = 0 27 24 12 20 28 36 44 52 60 MAX6765 toc03 4.0 3.5 3.0 2.5 2.0 1.5 -40 -25 -10 5 20 35 50 65 80 95 110 125 INPUT VOLTAGE (V) TEMPERATURE (°C) TEMPERATURE (°C) SHUTDOWN SUPPLY CURRENT vs. INPUT VOLTAGE NORMALIZED RESETIN THRESHOLD VOLTAGE vs. TEMPERATURE DROPOUT VOLTAGE vs. LOAD CURRENT 36 44 52 60 68 DROPOUT VOLTAGE (mV) -40 -25 -10 5 20 35 50 65 80 95 110 125 INPUT VOLTAGE (V) OUTPUT VOLTAGE vs. LOAD CURRENT 10 20 30 40 50 60 70 80 90 100 OUTPUT VOLTAGE vs. LOAD CURRENT VOUT = 5V 5.15 0 LOAD CURRENT (mA) TEMPERATURE (°C) 5.20 VOUT = 5V 5.10 5.05 5.00 4.95 3.32 3.30 3.28 3.26 4.90 3.24 4.85 3.22 4.80 VOUT = 3.3V 3.34 MAX6765 toc08 28 600 550 500 450 400 350 300 250 200 150 100 50 0 OUTPUT VOLTAGE (V) 20 OUTPUT VOLTAGE (V) 12 MAX6765 toc05 MAX6765 toc04 1.0 0.5 0 1.004 1.003 1.002 1.001 1.000 0.999 0.998 0.997 0.996 0.995 0.994 0.993 0.992 MAX6765 toc06 -40 -25 -10 5 20 35 50 65 80 95 110 125 6.0 5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0 1.5 4 4.5 1.0 68 NORMALIZED RESETIN THRESHOLD VOLTAGE 4 SUPPLY CURRENT (µA) ILOAD = 100mA 39 5.0 SHUTDOWN SUPPLY CURRENT (µA) 36 32 43 MAX6765 toc07 SUPPLY CURRENT (µA) ILOAD = 100mA 38 VOUT = 5V 45 SUPPLY CURRENT (µA) LIMITED BY POWER DISSIPATION 40 47 MAX6765 toc02 VOUT = 3.3V 42 MAX6765 toc01 44 SHUTDOWN SUPPLY CURRENT vs. TEMPERATURE SUPPLY CURRENT vs. TEMPERATURE SUPPLY CURRENT vs. INPUT VOLTAGE 3.20 0 10 20 30 40 50 60 70 80 90 100 LOAD CURRENT (mA) 0 10 20 30 40 50 60 70 80 90 100 LOAD CURRENT (mA) _______________________________________________________________________________________ 5 MAX6765–MAX6774 Typical Operating Characteristics (VIN = 14V, COUT = 10µF, CIN = 0.1µF, TA = +25°C, unless otherwise noted.) Typical Operating Characteristics (continued) (VIN = 14V, COUT = 10µF, CIN = 0.1µF, TA = +25°C, unless otherwise noted.) OUTPUT VOLTAGE vs. LOAD CURRENT RESET TIMEOUT PERIOD vs. CAPACITOR VALUE 1.80 1.79 1.78 1.77 100 80 60 40 1.76 20 1.75 0 10 20 30 40 50 60 70 80 90 100 MAX6765 toc11 1.08 1.06 1.04 1.02 1.00 0.98 0.96 0.94 0 25 50 LOAD CURRENT (mA) 75 100 125 -40 -25 -10 5 20 35 50 65 80 95 110 125 CAPACITOR VALUE (nF) NORMALIZED WATCHDOG TIMEOUT vs. TEMPERATURE 1.04 RESET OUTPUT vs. SOURCE CURRENT RESET OUTPUT vs. SINK CURRENT 4.0 MAX6765 toc12 1.06 TEMPERATURE (°C) 5.5 VOUT = 5V 3.5 4.5 RESET OUTPUT (V) 1.00 0.98 0.96 RESET OUTPUT (V) 3.0 1.02 2.5 2.0 1.5 0.94 1.0 0.92 0.5 0.90 0 VOUT = 5V 5.0 4.0 3.5 3.0 2.5 2.0 1.5 1.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 0.5 0 0 5 TEMPERATURE (°C) 15 20 25 30 35 0 40 2 4 8 OUT AND HOLD vs. ENABLE MAX6765 toc16 VOUT = 5V 41 6 ENABLE 5V/div 40 39 38 GATE 5V/div 37 HOLD 5V/div 36 OUT 5V/div 35 34 0.001 0.01 0.1 1 10 WATCHDOG INPUT FREQUENCY (kHz) 100 10 12 SOURCE CURRENT (mA) MAX6765 toc15 42 SUPPLY CURRENT (µA) 10 SINK CURRENT (mA) SUPPLY CURRENT vs. WATCHDOG INPUT FREQUENCY 6 MAX6765 toc14 1.81 120 NORMALIZED RESET TIMEOUT PERIOD 1.82 0 MAX6765 toc10 140 1.10 MAX6765 toc13 OUTPUT VOLTAGE (V) 1.83 NORMALIZED RESET TIMEOUT PERIOD vs. TEMPERATURE 160 RESET TIMEOUT PERIOD (ms) VOUT = 1.8V 1.84 MAX6765 toc09 1.85 NORMALIZED WATCHDOG TIMEOUT MAX6765–MAX6774 Automotive Micropower Linear Regulators with Supervisor 20ms/div (SEE TEST CIRCUIT FOR ENABLE AND HOLD) _______________________________________________________________________________________ 14 16 Automotive Micropower Linear Regulators with Supervisor NORMALIZED OUT VOLTAGE vs. INPUT VOLTAGE POWER-SUPPLY REJECTION RATIO vs. FREQUENCY 0 -20 -40 -60 -80 -100 -120 1.0020 MAX6765 toc18 20 VOUT = 3.3V 1.0015 NORMALIZED OUT VOLTAGE MAX6765 toc17 1.0010 1.0005 1.0000 0.9995 0.9990 -140 0.9985 -160 -180 0.9980 0.1 1 10 100 1k 10k 100k 1M 4 12 20 28 FREQUENCY (Hz) 36 44 52 60 68 INPUT VOLTAGE (V) LOAD-TRANSIENT RESPONSE LINE-TRANSIENT RESPONSE MAX6765 toc19 MAX6765 toc20 VOUT = 5V VOUT = 5V OUT (AC-COUPLED) 1V/div OUT (AC-COUPLED) 200mV/div VIN 10V/div IOUT 100mA/div 100ms/div 400µs/div OUTPUT CAPACITOR SERIES RESISTANCE vs. LOAD CURRENT LINE-TRANSIENT RESPONSE OUT (AC-COUPLED) 1V/div VIN 20V/div 11 MAX6765 toc22 MAX6765 toc21 VOUT = 5V OUTPUT CAPACITOR SERIES RESISTANCE (Ω) POWER-SUPPLY REJECTION RATIO (dB) 40 10 9 8 7 6 STABLE OPERATING REGION 5 4 3 2 1 0 400µs/div 0 20 40 60 80 100 LOAD CURRENT (mA) _______________________________________________________________________________________ 7 MAX6765–MAX6774 Typical Operating Characteristics (continued) (VIN = 14V, COUT = 10µF, CIN = 0.1µF, TA = +25°C, unless otherwise noted.) Automotive Micropower Linear Regulators with Supervisor MAX6765–MAX6774 Enable and Hold Test Circuit VIN IN ENABLE OUT OUT MAX6767 MAX6768 ENABLE HOLD HOLD GND N GATE TEST CIRCUIT FOR OUT AND HOLD VS. ENABLE Pin Description PIN MAX6765/ MAX6767/ MAX6766 MAX6768 MAX6771/ MAX6772 MAX6773/ MAX6773B/ MAX6774/ MAX6774B NAME FUNCTION Regulator Input. Bypass IN to GND with a capacitor with a minimum value of 0.1µF. 1 1 1 1 1 IN 2 2 2 2 2 GND 3 3 3 — 3 ENABLE Active-High Enable Input. Drive ENABLE high to turn on the regulator. ENABLE is internally connected to GND through a 0.6µA current sink. RESET Active-Low, Open-Drain/Push-Pull Reset Output. For the MAX6769/MAX6770, RESET asserts when RESETIN is below the internal VTH and deasserts when RESETIN is above the internal VTH threshold. For all other versions, RESET remains low while OUT is below the reset threshold. For all versions, RESET remains low for the duration of the reset timeout period after the reset conditions end. 4 5 6 8 MAX6769/ MAX6770 5 7 8 5 7 8 5 7 8 5 7 8 Ground Reset Timeout Adjust Input. Connect TIMEOUT to OUT for the internally fixed timeout period. For an TIMEOUT adjustable timeout, connect a capacitor from TIMEOUT to GND. See the Selecting Timeout Capacitor section. OUT Regulator Output. The MAX6765/MAX6766 provide a fixed output (+1.8V, +2.5V, +3.3V, or +5V). The MAX6767–MAX6774 provide a fixed output voltage of +1.8V, +2.5V, +3.3V, or 5V, or adjust the output from +1.8V to +11V. Bypass to GND with a 10µF capacitor (min). _______________________________________________________________________________________ Automotive Micropower Linear Regulators with Supervisor PIN MAX6765/ MAX6767/ MAX6766 MAX6768 — 4 MAX6769/ MAX6770 — MAX6771/ MAX6772 — MAX6773/ MAX6773B/ MAX6774/ MAX6774B — NAME FUNCTION HOLD Active-Low Regulator Hold Input. When HOLD is forced low, OUT remains on even if ENABLE is pulled low. To shut down the regulator, release HOLD after ENABLE is pulled low. Connect HOLD to OUT or leave unconnected if unused. HOLD is internally connected to OUT through a 1.8µA current source. Feedback Input for Setting the Output Voltage. Connect SET to GND to select the preset output voltage. Connect to an external resistive divider for adjustable output operation. — 6 6 6 6 SET — — 4 — — RESETIN — — — 3 — Active-High Enable Input 1. Drive ENABLE1 high to ENABLE1 turn on the regulator. ENABLE1 is internally connected to ground through a 0.6µA current sink. — — — 4 — Active-High Enable Input 2. Drive ENABLE2 high to ENABLE2 turn on the regulator. ENABLE2 is internally connected to ground through a 0.6µA current sink. — — — — — — — — 4 — Detailed Description The MAX6765–MAX6774B low-quiescent-current, highvoltage linear regulators operate from a 4V to 72V input voltage and deliver more than 100mA of load current. The MAX6765–MAX6774B include an integrated µP reset circuit that monitors the regulator output voltage and asserts a reset output when OUT falls below a threshold limit, and includes an internally fixed or adjustable reset timeout using a capacitor from TIMEOUT to ground. All devices are available in a preset output-voltage option of +1.8V, +2.5V, +3.3V, and +5V. The Adjustable Reset Threshold Input. Connect to a resistive divider to set the desired threshold. WDI Watchdog Timer Input. If WDI remains high or low for longer than the watchdog timeout period, the internal watchdog timer expires and the reset output asserts for the reset timeout period. The internal watchdog timer clears whenever a reset is asserted or WDI sees a rising or falling edge. The watchdog timer cannot be disabled. Do not leave WDI unconnected. EP Exposed Pad. EP is internally connected to GND. Connect EP to the ground plane to provide a low thermal-resistance path from the IC junction to the PCB. Do not use as the electrical connection to GND. output voltage of the MAX6767–MAX6774B is adjustable from +1.8V to +11V using a resistive divider at SET. The MAX6773/MAX6774 include a watchdog timer (WDI) with a 1.6s (typ) watchdog timeout period and the MAX6773B/MAX6774B include a watchdog timer with a 50ms (typ) watchdog timeout period. The MAX6769/ MAX6770 feature an adjustable reset threshold using a resistive divider between the monitored voltage, RESETIN, and GND; see the Functional Diagrams. The MAX6771/MAX6772 provide dual enable inputs (ENABLE1 and ENABLE2) to turn on and off the regulator either through an ignition switch or a bus transceiver. _______________________________________________________________________________________ 9 MAX6765–MAX6774 Pin Description (continued) Automotive Micropower Linear Regulators with Supervisor MAX6765–MAX6774 Functional Diagrams THERMAL PROTECTION MAX6765/MAX6766 OUT IN OVERCURRENT PROTECTION ENABLE CONTROL LOGIC 1.147V 1.233V RESET TIMEOUT RESET OR 1.085V TIMEOUT GND 10 ______________________________________________________________________________________ Automotive Micropower Linear Regulators with Supervisor THERMAL PROTECTION MAX6767/MAX6768 OUT IN OVERCURRENT PROTECTION ENABLE HOLD CONTROL LOGIC SET 116mV 1.147V 1.233V RESET TIMEOUT RESET OR 1.085V TIMEOUT GND ______________________________________________________________________________________ 11 MAX6765–MAX6774 Functional Diagrams (continued) Automotive Micropower Linear Regulators with Supervisor MAX6765–MAX6774 Functional Diagrams (continued) THERMAL PROTECTION MAX6769/MAX6770 OUT IN OVERCURRENT PROTECTION ENABLE CONTROL LOGIC SET 116mV 1.147V RESET TIMEOUT 1.233V RESET OR 1.085V RESETIN TIMEOUT GND 12 ______________________________________________________________________________________ Automotive Micropower Linear Regulators with Supervisor THERMAL PROTECTION MAX6771/MAX6772 OUT IN OVERCURRENT PROTECTION ENABLE1 ENABLE2 CONTROL LOGIC SET 116mV 1.147V RESET TIMEOUT 1.233V RESET OR 1.085V TIMEOUT GND ______________________________________________________________________________________ 13 MAX6765–MAX6774 Functional Diagrams (continued) Automotive Micropower Linear Regulators with Supervisor MAX6765–MAX6774 Functional Diagrams (continued) THERMAL PROTECTION MAX6773/MAX6773B MAX6774/MAX6774B OUT IN OVERCURRENT PROTECTION ENABLE CONTROL LOGIC SET 116mV 1.147V RESET TIMEOUT 1.233V RESET OR 1.085V TIMEOUT WDI GND 14 ______________________________________________________________________________________ Automotive Micropower Linear Regulators with Supervisor VIN IN OUT R1 Enable and Hold Inputs (MAX6767/MAX6768) The MAX6767/MAX6768 support two logic inputs, ENABLE (active-high) and HOLD (active-low), making these devices “automotive friendly.” For example, when the ignition key signal drives ENABLE high, the regulator turns on and remains on even if ENABLE goes low, as long as HOLD is forced low and kept low before ENABLE goes low. In this state, releasing HOLD turns the regulator output (OUT) off. This feature makes it possible to implement a self-holding circuit without external components. Forcing ENABLE low with HOLD high (or unconnected) places the MAX6767/MAX6768 into shutdown mode, drawing 3.3µA (typ) of supply current. Table 3 shows the state of the regulator output with respect to the voltage level at ENABLE and HOLD. Connect HOLD to OUT or leave it unconnected to allow the ENABLE input to act as a standard enable/shutdown switch for the regulator output (OUT). MAX6767–MAX6774B SET Figure 1. Setting the Output Voltage Using a Resistive Divider Table 1. Preset Timeout Period PART NUMBER SUFFIX (_) Reset Output The reset output is typically connected to the reset input of a µP. A µP’s reset input starts or restarts the µP in a known state. The MAX6765–MAX6774B supervisory circuits provide the reset logic to prevent code-execution errors during power-up, power-down, and brownout conditions (see the Typical Application Circuit). RESET changes from high to low whenever the monitored voltage drops below the reset threshold voltages. Once the monitored voltage exceeds its respective reset threshold voltage(s), RESET remains low for the reset timeout period, then goes high. See Table 1. R2 GND TIMEOUT PERIOD D0 75µs D1 3.125ms D2 12.5ms D3 50ms D4 200ms Table 2. Preset Output Voltage and Reset Threshold PART NUMBER SUFFIX (_) OUTPUT VOLTAGE (V) RESET THREHOLD (V) L 5 4.625 M 5 4.375 T 3.3 3.053 RESETIN Threshold (MAX6769/MAX6770) S 3.3 2.888 The MAX6769/MAX6770 monitor the voltage on RESETIN using an adjustable reset threshold (VRESETIN) set with an external resistive voltage-divider and the internal reset threshold VTH. See Table 2. Z 2.5 2.313 Y 2.5 2.188 W 1.8 1.665 V 1.8 1.575 ______________________________________________________________________________________ 15 MAX6765–MAX6774 Regulator The regulator accepts an input voltage from +4V to +72V. All of the devices feature fixed output-voltage options of +1.8V, +2.5V, +3.3V, and +5V. The MAX6767-MAX6774B feature an adjustable output voltage set with an external resistive-divider network connected between OUT, SET, and GND. See Figure 1. MAX6765–MAX6774 Automotive Micropower Linear Regulators with Supervisor Table 3. ENABLE/HOLD Truth Table/State Table OPERATING STATE ENABLE HOLD REGULATOR OUTPUT Initial State Low Don’t care Off ENABLE is pulled to GND through an internal pulldown. HOLD is high impedance (pulled up to OUT). Regulator output is disabled. Turn-On State High Don’t care On ENABLE is externally driven high turning the regulator output on. HOLD is pulled up by OUT. Hold Setup State High Low On HOLD is externally pulled low while ENABLE remains high (latches HOLD state). Hold State Low Low On ENABLE is driven low (or pulled low by an internal pulldown). HOLD remains externally pulled low keeping the regulator output on. Off-State Low High (pulled high) Off HOLD is driven high (or pulled high by an internal pullup) while ENABLE is low. Regulator output is shut off and ENABLE/ HOLD logic returns to the initial state. COMMENT Watchdog Timer (MAX6773/MAX6773B/ MAX6774/MAX6774B) The MAX6773/MAX6774 include a watchdog timer that asserts RESET if the watchdog input (WDI) does not toggle within the watchdog timeout period tWD (1.6s (typ) for the MAX6773/MAX6774 and 50ms (typ) for the MAX6773B/MAX6774B). RESET remains low for the reset timeout period, tRP. If the watchdog is not updated for lengthy periods of time, the reset output appears as a pulse train, asserted for the reset timeout period and deasserted for the watchdog timeout period, until WDI is toggled again. When RESET asserts, it stays low for the entire reset timeout period ignoring any WDI transitions. To prevent the watchdog from asserting RESET, toggle WDI with a valid rising or falling edge prior to tWD (min). The watchdog counter clears when WDI toggles prior to tWD or when RESET asserts. The watchdog resumes counting after RESET deasserts. The watchdog timer cannot be disabled. Thermal Protection When the junction temperature exceeds TJ = +160°C (typ), an internal thermal sensor signals the shutdown logic that turns off the pass transistor and allows the IC to cool. The thermal sensor turns the pass transistor on again after the IC’s junction temperature cools by 20°C (typ), resulting in a cycled output during continuous thermal-overload conditions. Thermal protection protects the MAX6765–MAX6774B in the event of a fault condition. Never exceed the absolute maximum junction temperature rating of TJ = +150°C. See Figures 3 and 4 for the safe operating area. Applications Information voltage mode. In preset voltage mode, internal trimmed feedback resistors set the internal linear regulator to +1.8V, +2.5V, +3.3V, or +5V (see Table 2). Select preset-voltage mode by connecting SET to ground. In adjustable mode, select an output voltage between +1.8V and +11V using two external resistors connected as a voltage-divider to SET (see Figure 1). Set the output voltage using the following equation: VOUT = VSET (1 + R1 / R2) where VSET = 1.233V and the recommended value for R2 is 50kΩ (maximum 100kΩ). RESETIN Threshold Selection The MAX6769/MAX6770 feature an adjustable reset threshold to monitor the voltage on RESETIN using a resistive divider between the monitored voltage, RESETIN and GND. See Figure 2. Use the following formula to set the desired reset threshold: VMON = VTH (1 + R3 / R4) where V TH is 1.085V for the M/S/Y/V versions and 1.147V for L/T/Z/W versions. VIN VMON IN R3 MAX6769 MAX6770 RESETIN R4 RESET GND Output Voltage Selection The MAX6767–MAX6774B feature dual-mode operation: these devices operate in either a preset or adjustable 16 Figure 2. RESETIN Threshold Selection ______________________________________________________________________________________ Automotive Micropower Linear Regulators with Supervisor Selecting Timeout Capacitor The reset timeout period is adjustable to accommodate a variety of µP applications. Adjust the reset timeout period by connecting a capacitor between TIMEOUT and GND. tRP = CTIMEOUT x 1.22 x 106Ω (L/M/T/S options) DERATE 23.8mW/°C ABOVE +70°C 2.2 1.8 1.6 1.6 1.4 1.2 1.0 1.4 1.2 1.0 SAFE OPERATING AREA 0.8 1.951W 2.0 PD (W) PD (W) 1.8 For stable operation over the full temperature range and with load currents up to 100mA, use a 10µF (min) output capacitor with an ESR < 0.5Ω. To reduce noise and improve load-transient response, stability, and powersupply rejection, use larger output-capacitor values. Some ceramic dielectrics exhibit large capacitance and ESR variation with temperature. For dielectric capacitors such as Z5U and Y5V, use more capacitance to ensure stability at low temperatures. With X7R or X5R dielectrics, 10µF should be sufficient at all operating temperatures. For higher-ESR tantalum capacitors, use larger capacitor values to maintain stability. To improve power-supply rejection and transient response, use a larger capacitor than the minimum 0.1µF capacitor between IN and GND. DERATE 24.4mW/°C ABOVE +70°C SAFE OPERATING AREA MAX6765 fig04 1.904W 2.0 Capacitor Selection and Regulator Stability MAX6765 fig03 2.2 tRP = CTIMEOUT x 1.17 x 106Ω (V/W/Y/Z options) where tRP is in seconds and CTIMEOUT is in Farads. Connect TIMEOUT to OUT to select the internally fixed timeout period. C TIMEOUT must be a low-leakage (< 10nA) type capacitor. Ceramic capacitors are recommended; do not use capacitor values lower than 100pF to avoid the influence of parasitic capacitances. 0.8 0.6 0.6 0.4 0.2 0.4 0.2 0 0 0 20 40 60 80 100 120 140 160 TEMPERATURE (°C) Figure 3. Maximum Power Dissipation vs. Temperature (MAX6765/MAX6766) 0 20 40 60 80 100 120 140 160 TEMPERATURE (°C) Figure 4. Maximum Power Dissipation vs. Temperature (MAX6767–MAX6774B) ______________________________________________________________________________________ 17 MAX6765–MAX6774 Available Output-Current Calculation The MAX6765–MAX6774B provide up to 100mA of load current. Package power dissipation limits the amount of output current available for a given input/output voltage and ambient temperature. Figures 3 and 4 depict the maximum power dissipation curve for the MAX6765/ MAX6766 and MAX6767–MAX6774B, respectively. The graph assumes that the exposed metal pad of the device package is soldered to a solid 1in2 section of 2oz. PCB copper (JESD51-3 AND JESD51-5). Use Figure 4 to determine the allowable package dissipation for a given ambient temperature. Alternately, use the following formula to calculate the allowable package dissipation: PDMAX = Max. Power Dissip = 1.951W, for TA ≤ +70°C PDMAX = Max. Power Dissip = [1.9W - 0.0244W x (TA - 70°C)], for +70°C < TA ≤ +125°C where 0.0244W is the MAX6767–MAX6774B package thermal derating in W/°C and TA is the ambient temperature in °C, under the same conditions used for Figure 4. After determining the allowable package dissipation, calculate the maximum output current using the following formula: PD < PDMAX where PD = [(VIN - VOUT) x IOUT] Also, IOUT should be ≤ 100mA in any case. MAX6765–MAX6774 Automotive Micropower Linear Regulators with Supervisor Ensuring a Valid RESET Output Down to VIN = 0V (MAX6766/MAX6768/MAX6770/ MAX6772/MAX6774/MAX6774B) VIN When VIN falls below 1V, RESET current-sinking capabilities decline drastically. High-impedance CMOSlogic inputs connected to RESET can drift to undetermined voltages. This presents no problems in most applications, since most µPs and other circuitry do not operate with supply voltages below 1V. In those applications where RESET must be valid down to 0V, adding a pulldown resistor between RESET and ground sinks any stray leakage currents, holding RESET low (Figure 5). The value of the pulldown resistor is not critical; 100kΩ is large enough not to load RESET and small enough to pull RESET to ground. Open-drain RESET versions are not recommended for applications requiring valid logic for VIN down to 0V. IN MAX6766 MAX6768 MAX6770 MAX6772 MAX6774 MAX6774B RESET GND Figure 5. Ensuring RESET Valid to VIN = 0V Table 4. Standard Version Part Numbers 18 PART OUTPUT VOLTAGE (V) RESET TIMEOUT PERIOD (ms) RESET THRESHOLD (V) TOP MARK MAX6765TTLD2+T 5 12.5 4.625 +AQB MAX6765TTSD2+T 3.3 12.5 2.888 +AQL MAX6766TTLD2+T 5 12.5 4.625 +ARO MAX6766TTSD2+T 3.3 12.5 2.888 +ARZ MAX6767TALD2+T 5 12.5 4.625 +AVI MAX6767TASD2+T 3.3 12.5 2.888 +AVS MAX6768TALD2+T 5 12.5 4.625 +AVZ MAX6768TASD2+T 3.3 12.5 2.888 +AXE MAX6769TALD2+T 5 12.5 4.625 +AYH MAX6769TASD2+T 3.3 12.5 2.888 +AYQ MAX6770TALD2+T 5 12.5 4.625 +AZS MAX6770TASD2+T 3.3 12.5 2.888 +BAC MAX6771TALD2+T 5 12.5 4.625 +BEG MAX6771TASD2+T 3.3 12.5 2.888 +BEQ MAX6772TALD2+T 5 12.5 4.625 +APY +BGC MAX6772TASD2+T 3.3 12.5 2.888 MAX6773TALD2+T 5 12.5 4.625 +BBG MAX6773TASD2+T 3.3 12.5 2.888 +AQE MAX6773BTALD2+T 5 12.5 4.625 +BHK MAX6773BTASD2+T 3.3 12.5 2.888 +BHU MAX6774TALD2+T 5 12.5 4.625 +BCS MAX6774TASD2+T 3.3 12.5 2.888 +BDC MAX6774BTALD2+T 5 12.5 4.625 +BIY MAX6774BTASD2+T 3.3 12.5 2.888 +BJI ______________________________________________________________________________________ Automotive Micropower Linear Regulators with Supervisor PART RESET OUTPUT TYPICAL WATCHDOG TIMEOUT OUTPUT VOLTAGE RESETIN THRESHOLD ENABLE INPUTS HOLD INPUT MAX6765 Open drain — Fixed — Single — MAX6766 Push-pull — Fixed — Single — MAX6767 Open drain — Fixed/Adj — Single √ MAX6768 Push-pull — Fixed/Adj — Single √ MAX6769 Open drain — Fixed/Adj √ Single — MAX6770 Push-pull — Fixed/Adj √ Single — MAX6771 Open drain — Fixed/Adj — Dual — MAX6772 Push-pull — Fixed/Adj — Dual — MAX6773 Open drain 1.6s Fixed/Adj — Single — MAX6773B Open drain 50ms Fixed/Adj — Single — MAX6774 Push-pull 1.6s Fixed/Adj — Single — MAX6774B Push-pull 50ms Fixed/Adj — Single — Typical Application Circuit OUT IN MAX6766 VCC TIMEOUT 12V BATTERY TXD GND µC ENABLE RESET XCVR LIN RXD RESET I/O ______________________________________________________________________________________ 19 MAX6765–MAX6774 Selector Guide Automotive Micropower Linear Regulators with Supervisor TIMEOUT SET RESET OUT TIMEOUT SET RESET TOP VIEW OUT TOP VIEW 8 7 6 5 8 7 6 5 MAX6767 MAX6768 MAX6769 MAX6770 EP 1 2 3 4 1 2 IN GND ENABLE HOLD IN GND + TDFN TDFN TIMEOUT SET RESET OUT TIMEOUT SET RESET TOP VIEW 8 7 6 5 8 7 6 5 MAX6773 MAX6773B MAX6774 MAX6774B MAX6771 MAX6772 EP EP 1 2 3 4 1 2 3 4 GND ENABLE1 ENABLE2 IN GND ENABLE WDI + IN + TDFN 20 4 OUT TOP VIEW 3 RESETIN EP + ENABLE MAX6765–MAX6774 Pin Configurations (continued) TDFN ______________________________________________________________________________________ Automotive Micropower Linear Regulators with Supervisor TEMP RANGE PINPACKAGE MAX6766TT_D_+ -40°C to +125°C 6 TDFN-EP* MAX6767TA_D_+ -40°C to +125°C 8 TDFN-EP* MAX6768TA_D_+ -40°C to +125°C 8 TDFN-EP* PART MAX6769TA_D_+ -40°C to +125°C 8 TDFN-EP* MAX6769TA_D_/V+ -40°C to +125°C 8 TDFN-EP* MAX6770TA_D_+ -40°C to +125°C 8 TDFN-EP* MAX6771TA_D_+ -40°C to +125°C 8 TDFN-EP* MAX6772TA_D_+ -40°C to +125°C 8 TDFN-EP* MAX6773TA_D_/V+ -40°C to +125°C 8 TDFN-EP* MAX6773BTA_D_/V+ -40°C to +125°C 8 TDFN-EP* MAX6774TA_D_+ -40°C to +125°C 8 TDFN-EP* MAX6774BTA_D_+ -40°C to +125°C 8 TDFN-EP* PROCESS: BiCMOS Package Information For the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE PACKAGE CODE OUTLINE NO. LAND PATTERN NO. 6 TDFN-EP T633+2 21-0137 90-0058 8 TDFN-EP T833+2 21-0137 90-0059 The first “_” is a placeholder for the voltage output and reset threshold. The 2nd “_” designates the fixed reset-timeout option. See Tables 1 and 2 for details. For example, the MAX6765TTLD4 has a 5V output, a reset threshold of 4.65V, and a 200ms typical reset timeout. +Denotes a lead(Pb)-free/RoHS-compliant package. /V denotes an automotive qualified part. *EP = Exposed pad. For tape-and-reel orders add a “T” after the “+” symbol to complete the part number. Tape-and-reel orders are available in 2.5k increments. Nonstandard versions require a 10k minimum order quantity. ______________________________________________________________________________________ 21 MAX6765–MAX6774 Chip Information Ordering Information (continued) MAX6765–MAX6774 Automotive Micropower Linear Regulators with Supervisor Revision History REVISION NUMBER REVISION DATE 0 10/06 Initial release 1 1/07 Introduced MAX6765 and MAX6766 2 7/07 Added the MAX6773B and MAX6774D to data sheet. Updated Features, General Description, Ordering Information, Functional Diagrams, Table 4, Selector Guide, Watchdog Timer section, and Pin Configurations. 3 9/07 Revised Typical Operating Characteristics. 7 4 6/10 Added /V to the MAX6765TT_D_+. 1 5 10/11 Added /V to the MAX6773TA_D_+; added Timeout ramp threshold to Electrical Characteristics table. Changed tRP formula in Selecting Timeout Capacitor section. 6 3/12 Added /V to the MAX6769TA_D_/V+. DESCRIPTION PAGES CHANGED — 1, 21, 23 1, 4, 8, 9, 14, 16, 18–23 4, 17, 21 21 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. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. 22 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2012 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.