MAX6765TTSD2+ ,Automotive Micropower Linear Regulators with SupervisorFeatures♦ Low 31µA Quiescent CurrentThe MAX6765–MAX6774B are low-quiescent-current,♦ 4V to 72V Wide ..
MAX6766TTSD2+T ,Automotive Micropower Linear Regulators with SupervisorEVALUATION KIT AVAILABLE MAX6765–MAX6774Automotive Micropower Linear Regulators with Supervisor
MAX6776LTA+T ,Low-Power, 1%-Accurate Battery Monitor in µDFN and SC70 PackagesELECTRICAL CHARACTERISTICS(V = 1.6V to 5.5V, T = -40°C to +85°C, unless otherwise specified. Typica ..
MAX6776XKA+T ,Low-Power, 1%-Accurate Battery Monitor in µDFN and SC70 PackagesApplicationsBattery-Powered Systems (Single-Cell Li+ orMulticell NiMH, NiCd, Alkaline)Cell Phones/C ..
MAX6777XK+ ,Low-Power, 1%-Accurate Battery Monitor in µDFN and SC70 PackagesELECTRICAL CHARACTERISTICS (continued)(V = 1.6V to 5.5V, T = -40°C to +85°C, unless otherwise speci ..
MAX677ACPP ,V(cc): -0.3 to +20V; calibrated, low-drift, +4.096V / +5V / +10V precision voltage reference. For high resolution 16-bit ADCs and DACs, precision test and measurement systems, precision calibrated voltage-reference, high-accuracy transduceELECTRICAL CHARACTERISTICS-MAF
(Vcc = +5V, IL = 0mA, TA = +25 tl unless otherWIse noted.)
MAX ..
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MB3782PF ,Switching Regulator ControllerFUJITSU SEMICONDUCTORDS04-27205-4EDATA SHEETASSP Power Supplies BIPOLARSwitching Regulator Controll ..
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MAX6765TTLD2+-MAX6765TTSD2/V+T-MAX6765TTSD2+-MAX6766TTSD2+T
Automotive Micropower Linear Regulators with Supervisor
MAX6765–MAX6774
Automotive Micropower Linear Regulators
with SupervisorEVALUATION KIT AVAILABLE
General DescriptionThe 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 low-
power 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 open-
drain, active-low RESEToutput with either fixed or
adjustable thresholds. Whenever the regulator’s output
falls below the reset threshold, the RESEToutput 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 tradi-
tional enable input (ENABLE) to turn on and off the regula-
tor. 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 addi-
tion to the enable input to allow for the implementation of a
self-holding circuit without requiring external components.
Setting HOLDlow after enabling the regulator forces the
regulator to remain on even if ENABLE is subsequently
set low. Releasing HOLDshuts 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, ther-
mally 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.
The MAX6765–MAX6774B are fully specified for a -40°C
to +125°C operating temperature range.
ApplicationsAutomotive
Industrial
Telecom
FeaturesLow 31µA Quiescent Current4V to 72V Wide Input Voltage Range100mA Output Current CapabilityDropout Voltage of 620mV with 5V Outputat 100mAFixed Output-Voltage Options: 5V, 3.3V, 2.5V, and 1.8VWatchdog Timer Option (1.6s (MAX6773/MAX6774) and 50ms (MAX6773B/MAX6774B))Adjustable Output Voltages from 1.8V to 11VOpen-Drain or Push-Pull RESETOutputFixed or Capacitor-Adjustable Reset TimeoutsSmall, Thermally Enhanced 1.9W, 3mm x 3mmTDFN PackageOvertemperature and Short-Circuit ProtectionFully Specified from -40°C to +125°CENABLE
GND
RESETTIMEOUTOUT
MAX6765
MAX6766
TDFNTOP VIEW
PARTTEMP
RANGE
PIN-
PACKAGE
MAX6765TT_D_+-40°C to +125°C6 TDFN-EP*
MAX6765TT_D_/V+-40°C to +125°C6 TDFN-EP*
Pin Configurations
Ordering Information
Ordering Information continued at end of data sheet.
Typical Application Circuit and Selector Guide appear atThe 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 com-
plete the part number. Tape-and-reel orders are available in
2.5k increments. Nonstandard versions require a 10k minimum
order quantity.
MAX6765–MAX6774
Automotive Micropower Linear Regulators
with Supervisor
ABSOLUTE MAXIMUM RATINGS
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)
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.
(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
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSupply Voltage RangeVIN472V
ILOAD = 0A3145
ILOAD = 50mA3550
ILOAD = 100mA, VIN = 14V3755
ILOAD = 0A, VIN = 42V3550
Supply Current
(MAX6765–MAX6772) (Note 2)
ILOAD = 10mA, VIN = 42V3755
ILOAD = 0A3850
ILOAD = 50mA4255
ILOAD = 100mA4460
ILOAD = 0A, VIN = 42V4255
Supply Current
(MAX6773/MAX6773B/
MAX6774/MAX6774B)
(Note 2)ILOAD = 10mA, VIN = 42V4460
Shutdown Supply CurrentISHDNENABLE , ENABLE1, ENABLE2 = GND3.37µA
L/M, ILOAD = 1mA4.92555.075
L/M, 1mA ≤ ILOAD ≤ 100mA, VIN = 11V4.85055.150
T/S, ILOAD = 1mA3.2513.33.350
T/S, 1mA ≤ ILOAD ≤ 100mA, VIN = 9.3V3.2013.33.399
Z/Y, ILOAD = 1mA2.4632.52.538
Z/Y, 1mA ≤ ILOAD ≤ 100mA, VIN = 8.5V2.4252.52.575
W/V, ILOAD = 1mA1.7731.81.827
Output VoltageVOUT
W/V, 1mA ≤ ILOAD ≤ 100mA, VIN = 7.8V1.7461.81.854
Adjustable Output Voltage RangeVOUT1.811.0V
SET Threshold Voltage
(MAX6767–MAX6774)VSETILOAD = 1mA1.201.2331.26V
SET rising116
Dual Mode™ SET ThresholdSET falling58mV
Dual Mode is a trademark of Maxim Integrated Products, Inc.
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)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSSET Input Current
(MAX6767–MAX6774)ISETVSET = 1.5V, VIN = 11V-100+100nA
L/M, 5V output option, ILOAD = 10mA60130
L/M, 5V output option, ILOAD = 50mA300630
L/M, 5V output option, ILOAD = 100mA6201200Dropout Voltage (Note 3)ΔVDO
T/S, 3.3V output option, ILOAD = 100mA8661600
Guaranteed Output Current
(Note 4)100mA
Output Current LimitOutput shorted to GND, VIN = 14V150250mA
Thermal-Shutdown Temperature160°C
Thermal-Shutdown Hysteresis20°C
Line Regulation6.5V ≤ VIN ≤ 72V, ILOAD = 1mA1%
Load Regulation
(MAX6767–MAX6774)
IOUT = 1mA to 100mA,
VIN = VOUT(NOM) + 6V1.5%
Power-Supply Rejection RatioPSRRILOAD = 10mA, fIN = 100Hz, 500mVP-P70dB
Startup Response TimetSTARTFrom ENABLE high to OUT,
ILOAD = 100mA180µs
Output Overvoltage Protection
ThresholdOVTHISINK = 1mA (from OUT)1.07 x
VOUT
1.1 x
VOUT
1.13 x
VOUTV
Output Overvoltage Protection
Maximum Sink CurrentOUT = OUT(NOM) x 1.15510mA
LOGIC INPUT (ENABLE, ENABLE1, ENABLE2, HOLD)Input Low VoltageVILENABLE, ENABLE1, ENABLE20.4V
Input High VoltageVIHENABLE, ENABLE1, ENABLE21.4V
ENABLE, ENABLE1, ENABLE2
Input Pulldown Current
ENABLE, ENABLE1, ENABLE2 are
internally pulled down to GND0.6µA
VIL1.8V ≤ VOUT ≤ 11V0.4
HOLD Input Threshold VoltageVIH1.8V ≤ VOUT ≤ 11VOUT -
HOLD Input Pullup CurrentHOLD is internally pulled up to OUT1.8µA
RESET OUTPUT4.5004.6254.7504.2504.3754.5002.9703.0533.1352.8052.8882.9702.2502.3132.3752.1252.1882.2501.6201.6651.710
RESET ThresholdSET = GND,
RESET falling1.5301.5751.620
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)
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSL/T/Z/W, SET = resistive divider, RESET
falling
VOUT x
VOUT x
VOUT x
0.950RESET Threshold (Adjustable
Output Voltage)M/S/Y/V, SET = resistive divider, RESET
falling
VOUT x
VOUT x
VOUT x
RESETIN Input CurrentVRESETIN = VGND or 12V-100+100nA
VTH = 87.5% of VSET (M/S/Y/V),
RESET falling1.0571.0851.112
RESETIN Threshold
VTH = 92.5% of VSET (L/T/Z/W),
RESET falling1.1181.1471.176
OUT to RESET DelayVOUT falling0.3µs
RESETIN To RESET DelayRESETIN falling35µs75µs2.1873.1254.0638.7512.516.25355065
RESET Timeout Period (TIMEOUT
Connected to OUT)VOUT rising140200260
TIMEOUT Ramp Current80010001200nA
L/M/T/S options1.1601.2201.259TIMEOUT Ramp ThresholdV/W/Y/Z options1.0601.1701.242V
VOUT ≥ 1.8V, ISINK = 50µA,
RESET asserted0.3RESET Output-Voltage Low
(Open Drain or Push-Pull)VOLVOUT ≥ 1.8V, ISINK = 3.2mA,
RESET asserted0.4
RESET Output-Voltage High
(Push-Pull)VOHVOUT ≥ 1.8V, ISOURCE = 250µA,
RESET not asserted
0.8 x
VOUTV
RESET Open-Drain Leakage
CurrentRESET not asserted, RESET = 12V100nA
Watchdog Minimum Input PulsetWDI1.8V ≤ VOUT ≤ 11V1µs
Watchdog Input Low VoltageVIL1.8V ≤ VOUT ≤ 11V0.4V
Watchdog Input High VoltageVIH1.8V ≤ VOUT ≤ 11VVOUT
- 0.4VV
Watchdog Input Low VoltageVIL1.8V ≤ VOUT ≤ 11V0.4V
Watchdog Input CurrentIWDIVWDI = 0V or VWDI = 12V-1+1µA
MAX6773/MAX67741.121.62.08sWatchdog Timeout PeriodtWDMAX6773B/MAX6774B405060ms
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 VOUTequals 98% of the nominal value of VOUTwhen
VIN= 11V. For T/S versions, dropout voltage is defined as (VIN- VOUT) when VOUTequals 98% of the nominal value of VOUT
when VIN= 9.3V.
Note 4:Observe the absolute maximum power dissipation limits.
SUPPLY CURRENT vs. INPUT VOLTAGE
MAX6765 toc01
INPUT VOLTAGE (V)
SUPPLY CURRENT (ILOAD = 100mA
ILOAD = 0
LIMITED BY POWER
DISSIPATION
VOUT = 3.3V
SUPPLY CURRENT vs. TEMPERATURE
MAX6765 toc02
TEMPERATURE (°C)
SUPPLY CURRENT (
ILOAD = 100mA
ILOAD = 50mA
ILOAD = 1mA
ILOAD = 0
VOUT = 5V
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX6765 toc03
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT (
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE
MAX6765 toc04
INPUT VOLTAGE (V)
SUPPLY CURRENT (
NORMALIZED RESETIN THRESHOLD VOLTAGE
vs. TEMPERATURE
MAX6765 toc05
TEMPERATURE (°C)
NORMALIZED RESETIN THRESHOLD VOLTAGE
DROPOUT VOLTAGE
vs. LOAD CURRENT
MAX6765 toc06
LOAD CURRENT (mA)
DROPOUT VOLTAGE (mV)
VOUT = 5V
OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX6765 toc07
OUTPUT VOLTAGE (V)406080100
LOAD CURRENT (mA)
VOUT = 5V
OUTPUT VOLTAGE
vs. LOAD CURRENTMAX6765 toc08
OUTPUT VOLTAGE (V)406080100
VOUT = 3.3V
Typical Operating Characteristics(VIN= 14V, COUT= 10µF, CIN= 0.1µF, TA= +25°C, unless otherwise noted.)
MAX6765–MAX6774
Automotive Micropower Linear Regulators
with Supervisor
MAX6765–MAX6774
Automotive Micropower Linear Regulators
with Supervisor
Typical Operating Characteristics (continued)(VIN= 14V, COUT= 10µF, CIN= 0.1µF, TA= +25°C, unless otherwise noted.)
OUTPUT VOLTAGE
vs. LOAD CURRENTMAX6765 toc09
OUTPUT VOLTAGE (V)
LOAD CURRENT (mA)
VOUT = 1.8V
RESET TIMEOUT PERIOD
vs. CAPACITOR VALUE
MAX6765 toc10
CAPACITOR VALUE (nF)
RESET TIMEOUT PERIOD (ms)
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
MAX6765 toc11
TEMPERATURE (°C)
NORMALIZED RESET TIMEOUT PERIOD
NORMALIZED WATCHDOG TIMEOUT
vs. TEMPERATUREMAX6765 toc12
TEMPERATURE (°C)
NORMALIZED WATCHDOG TIMEOUT
RESET OUTPUT vs. SINK CURRENT
MAX6765 toc13
SINK CURRENT (mA)
RESET OUTPUT (V)
VOUT = 5V
MAX6765 toc14
SOURCE CURRENT (mA)
RESET OUTPUT (V)21014
RESET OUTPUT vs. SOURCE CURRENTVOUT = 5V
SUPPLY CURRENT
vs. WATCHDOG INPUT FREQUENCY
MAX6765 toc15
WATCHDOG INPUT FREQUENCY (kHz)
SUPPLY CURRENT (
VOUT = 5V
ENABLE
5V/div
GATE
5V/div
HOLD
5V/div
OUT
5V/div
OUT AND HOLD vs. ENABLEMAX6765 toc16
20ms/div
(SEE TEST CIRCUIT FOR ENABLE AND HOLD)
MAX6765–MAX6774
Automotive Micropower Linear Regulators
with SupervisorPOWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
FREQUENCY (Hz)
0.11k10k100k1011001M
POWER-SUPPLY REJECTION RATIO (dB)
MAX6765 toc17
NORMALIZED OUT VOLTAGE
vs. INPUT VOLTAGE
MAX6765 toc18
INPUT VOLTAGE (V)
NORMALIZED OUT VOLTAGE
VOUT = 3.3V
OUT
(AC-COUPLED)
200mV/div
IOUT
100mA/div
LOAD-TRANSIENT RESPONSEMAX6765 toc19
100ms/div
VOUT = 5V
OUT
(AC-COUPLED)
1V/div
VIN
10V/div
LINE-TRANSIENT RESPONSEMAX6765 toc20
400μs/div
VOUT = 5V
OUT
(AC-COUPLED)
1V/div
VIN
20V/div
LINE-TRANSIENT RESPONSEMAX6765 toc21
400μs/div
VOUT = 5V80
OUTPUT CAPACITOR SERIES RESISTANCE
vs. LOAD CURRENTMAX6765 toc22
LOAD CURRENT (mA)
OUTPUT CAPACITOR SERIES RESISTANCE (
STABLE OPERATING
REGION
Typical Operating Characteristics (continued)(VIN= 14V, COUT= 10µF, CIN= 0.1µF, TA= +25°C, unless otherwise noted.)
MAX6765–MAX6774
Automotive Micropower Linear Regulators
with Supervisor
Pin Description
Enable and Hold Test Circuit
PIN
MAX6765/
MAX6766
MAX6767/
MAX6768
MAX6769/
MAX6770
MAX6771/
MAX6772
MAX6773/
MAX6773B/
MAX6774/
MAX6774B
NAMEFUNCTION111INRegulator Input. Bypass IN to GND with a capacitor
with a minimum value of 0.1µF.2222GNDGround33—3ENABLE
Active-High Enable Input. Drive ENABLE high to turn
on the regulator. ENABLE is internally connected to
GND through a 0.6µA current sink.555RESET
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.7777TIMEOUT
Reset Timeout Adjust Input. Connect TIMEOUT to
OUT for the internally fixed timeout period. For an
adjustable timeout, connect a capacitor from
TIMEOUT to GND. See the Selecting Timeout
Capacitor section.8888OUT
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).
GND
VIN
ENABLE
ENABLE
GATE
HOLD
OUTOUTMAX6767
MAX6768
TEST CIRCUIT FOR OUT AND HOLD VS. ENABLE
HOLD
MAX6765–MAX6774
Automotive Micropower Linear Regulators
with Supervisor
Pin Description (continued)
PIN
MAX6765/
MAX6766
MAX6767/
MAX6768
MAX6769/
MAX6770
MAX6771/
MAX6772
MAX6773/
MAX6773B/
MAX6774/
MAX6774B
NAMEFUNCTION———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.6666SET
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.—4——RESETINAdjustable Reset Threshold Input. Connect to a
resistive divider to set the desired threshold.——3—ENABLE1
Active-High Enable Input 1. Drive ENABLE1 high to
turn on the regulator. ENABLE1 is internally
connected to ground through a 0.6µA current sink.——4—ENABLE2
Active-High Enable Input 2. Drive ENABLE2 high to
turn on the regulator. ENABLE2 is internally
connected to ground through a 0.6µA current sink.
————4WDI
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.
Detailed DescriptionThe MAX6765–MAX6774B low-quiescent-current, high-
voltage 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 TIME-
OUT to ground. All devices are available in a preset out-
put-voltage option of +1.8V, +2.5V, +3.3V, and +5V. The
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 regula-
tor either through an ignition switch or a bus transceiver.
MAX6765–MAX6774
Automotive Micropower Linear Regulators
with Supervisor
Functional DiagramsMAX6765/MAX6766
THERMAL
PROTECTION
CONTROL
LOGIC
1.233V
OUT
RESET
GND
1.147V
1.085V
OVERCURRENT
PROTECTION
RESET
TIMEOUT
ENABLE
TIMEOUT
MAX6765–MAX6774
Automotive Micropower Linear Regulators
with Supervisor
Functional Diagrams (continued)MAX6767/MAX6768
THERMAL
PROTECTION
CONTROL
LOGIC
116mV
OUT
SET
RESET
GND
OVERCURRENT
PROTECTION
RESET
TIMEOUT
ENABLE
HOLD
TIMEOUT
1.233V
1.147V
1.085V
