MAX6773TATD4+ - Maxim Integrated Products, Inc.

General Description

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 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 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 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 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, 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.

Applications

Automotive

Industrial

Telecom

Features

♦ 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

MAX6765–MAX6774

Automotive Micropower Linear Regulators

with Supervisor

________________________________________________________________ Maxim Integrated Products 1

654

ENABLE

GND

RESET

TIMEOUT

OUT

MAX6765

MAX6766

TDFN

TOP VIEW

PART TEMP

RANGE

PIN-

PACKAGE

PKG

CODE

MAX6765TT_D_+ -40°C to +125°C 6 TDFN-EP* T633-2

MAX6766TT_D_+ -40°C to +125°C 6 TDFN-EP* T633-2

Pin Configurations

Ordering Information

19-0657; Rev 3; 9/07

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.

Ordering Information continued at end of data sheet.

Typical Application Circuit and Selector Guide appear at

end of data sheet. Pin Configurations continued at end of data sheet.

EVALUATION KIT

AVAILABLE

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 lead-free package.

*EP = Exposed paddle.

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

2 _______________________________________________________________________________________

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

PARAMETER

SYMBOL

CONDITIONS MIN TYP

MAX

UNITS

Supply Voltage Range VIN 472V

ILOAD = 0 31 45

ILOAD = 50mA 35 50

ILOAD = 100mA, VIN = 14V 37 55

ILOAD = 0, VIN = 42V 35 50

Supply Current

(MAX6765–MAX6772) (Note 2)

ILOAD = 10mA, VIN = 42V 37 55

µA

ILOAD = 0 38 50

ILOAD = 50mA 42 55

ILOAD = 100mA 44 60

ILOAD = 0, VIN = 42V 42 55

Supply Current

(MAX6773/MAX6773B/

MAX6774/MAX6774B)

(Note 2) ILOAD = 10mA, VIN = 42V 44 60

µA

Shutdown Supply Current

ISHDN

ENABLE , ENABLE1, ENABLE2 = GND 3.3 7 µA

L/M, ILOAD = 1mA

4.925

5.075

L/M, 1mA ≤ ILOAD ≤ 100mA, VIN = 11V

4.850

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

Output Voltage VOUT

W/V, 1mA ≤ ILOAD ≤ 100mA, VIN = 7.8V

1.746

1.8

1.854

Adjustable Output Voltage Range

VOUT 1.8 11.0 V

SET Threshold Voltage

(MAX6767–MAX6774) VSET ILOAD = 1mA 1.20

1.233

1.26 V

SET rising 116

Dual Mode™ SET Threshold SET falling 58 mV

Dual Mode is a trademark of Maxim Integrated Products, Inc.

MAX6765–MAX6774

Automotive Micropower Linear Regulators

with Supervisor

_______________________________________________________________________________________ 3

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

CONDITIONS MIN TYP

MAX

UNITS

SET Input Current

(MAX6767–MAX6774) ISET VSET = 1.5V, VIN = 11V -100

+100

L/M, 5V output option, ILOAD = 10mA 60 130

L/M, 5V output option, ILOAD = 50mA 300 630

L/M, 5V output option, ILOAD = 100mA 620

1200

Dropout Voltage (Note 3) ∆VDO

T/S, 3.3V output option, ILOAD = 100mA 866

1600

Guaranteed Output Current

(Note 4) 100 mA

Output Current Limit Output shorted to GND, VIN = 14V 150 250 mA

Thermal-Shutdown Temperature 160 °C

Thermal-Shutdown Hysteresis 20 °C

Line Regulation 6.5V ≤ VIN ≤ 72V, ILOAD = 1mA 1 %

Load Regulation

(MAX6767–MAX6774)

IOUT = 1mA to 100mA,

VIN = VOUT(NOM) + 6V 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) 1.07 x

VOUT

1.1 x

VOUT

1.13 x

VOUT

Output Overvoltage Protection

Maximum Sink Current OUT = OUT(NOM) x 1.15 5 10 mA

LOGIC INPUT (ENABLE, ENABLE1, ENABLE2, HOLD)

Input Low Voltage VIL ENABLE, ENABLE1, ENABLE2 0.4 V

Input High Voltage VIH ENABLE, ENABLE1, ENABLE2 1.4 V

ENABLE, ENABLE1, ENABLE2

Input Pulldown Current

ENABLE, ENABLE1, ENABLE2 are

internally pulled down to GND 0.6 µA

VIL 1.8V ≤ VOUT ≤ 11V 0.4

HOLD Input Threshold Voltage VIH 1.8V ≤ VOUT ≤ 11V OUT -

0.4

HOLD Input Pullup Current HOLD is internally pulled up to OUT 1.8 µA

RESET OUTPUT

4.500 4.625 4.750

4.250 4.375 4.500

2.970 3.053 3.135

2.805 2.888 2.970

2.250 2.313 2.375

2.125 2.188 2.250

1.620 1.665 1.710

RESET Threshold SET = GND,

RESET falling

1.530 1.575 1.620

MAX6765–MAX6774

Automotive Micropower Linear Regulators

with Supervisor

4 _______________________________________________________________________________________

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

CONDITIONS MIN TYP

MAX

UNITS

L/T/Z/W, SET = resistive divider, RESET

falling

VOUT x

0.9

VOUT x

0.925

VOUT x

0.950

RESET Threshold (Adjustable

Output Voltage) M/S/Y/V, SET = resistive divider, RESET

falling

VOUT x

0.85

VOUT x

0.875

VOUT x

0.900

RESETIN Input Current RESETIN = GND or 12V -100

+100

VTH = 87.5% of VSET (M/S/Y/V),

RESET falling

1.057 1.085 1.112

RESETIN Threshold

VTH = 92.5% of VSET (L/T/Z/W),

RESET falling

1.118 1.147 1.176

OUT to RESET Delay VOUT falling 0.3 µs

RESETIN To RESET Delay RESETIN falling 35 µs

D0 75 µs

2.187 3.125 4.063

D2 8.75 12.5

16.25

D3 35 50 65

RESET Timeout Period (TIMEOUT

Connected to OUT) VOUT rising

D4 140 200 260

TIMEOUT Ramp Current 800

1000 1200

TIMEOUT Ramp Threshold

1.160

1.22

1.259

VOUT ≥ 1.8V, ISINK = 50µA,

RESET asserted 0.3

RESET Output-Voltage Low

(Open Drain or Push-Pull) VOL VOUT ≥ 1.8V, ISINK = 3.2mA,

RESET asserted 0.4

RESET Output-Voltage High

(Push-Pull) VOH VOUT ≥ 1.8V, ISOURCE = 250µA,

RESET not asserted

0.8 x

VOUT

RESET Open-Drain Leakage

Current RESET not asserted, RESET = 12V 100 nA

Watchdog Minimum Input Pulse tWDI 1.8V ≤ VOUT ≤ 11V 1 µs

Watchdog Input Low Voltage VIL 1.8V ≤ VOUT ≤ 11V 0.4 V

Watchdog Input High Voltage VIH 1.8V ≤ VOUT ≤ 11V

VOUT

- 0.4V

Watchdog Input Low Voltage VIL 1.8V ≤ VOUT ≤ 11V 0.4 V

Watchdog Input Current IWDI WDI = 0V or WDI = 12V -1 +1 µA

MAX6773/MAX6774 1.12 1.6 2.08 s

Watchdog Timeout Period tWD MAX6773B/MAX6774B 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.

MAX6765–MAX6774

Automotive Micropower Linear Regulators

with Supervisor

_______________________________________________________________________________________ 5

4202812 36 44 52 60 68

SUPPLY CURRENT vs. INPUT VOLTAGE

MAX6765 toc01

INPUT VOLTAGE (V)

SUPPLY CURRENT (µA)

ILOAD = 100mA

ILOAD = 0

LIMITED BY POWER

DISSIPATION

VOUT = 3.3V

-40 -10 5-25 203550658095110125

SUPPLY CURRENT vs. TEMPERATURE

MAX6765 toc02

TEMPERATURE (°C)

SUPPLY CURRENT (µA)

ILOAD = 100mA

ILOAD = 50mA

ILOAD = 1mA

ILOAD = 0

VOUT = 5V

1.0

1.5

4.5

2.5

2.0

3.0

3.5

4.0

5.0

-40 -10 5 20-25 35 50 9580 11065 125

SHUTDOWN SUPPLY CURRENT

vs. TEMPERATURE

MAX6765 toc03

TEMPERATURE (°C)

SHUTDOWN SUPPLY CURRENT (µA)

1.0

0.5

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

6.0

12 36 60

SHUTDOWN SUPPLY CURRENT

vs. INPUT VOLTAGE

MAX6765 toc04

INPUT VOLTAGE (V)

SUPPLY CURRENT (µA)

428445220 68

0.992

1.004

1.003

1.002

1.001

1.000

0.999

0.998

0.997

0.996

0.995

0.994

0.993

-40 -10 5-25 203550658095110125

NORMALIZED RESETIN THRESHOLD VOLTAGE

vs. TEMPERATURE

MAX6765 toc05

TEMPERATURE (°C)

NORMALIZED RESETIN THRESHOLD VOLTAGE

100

150

200

250

300

350

400

450

500

550

600

40 60 80 100

DROPOUT VOLTAGE

vs. LOAD CURRENT

MAX6765 toc06

LOAD CURRENT (mA)

DROPOUT VOLTAGE (mV)

03010 50 70 90

VOUT = 5V

4.80

4.90

4.85

4.95

5.10

5.15

5.05

5.00

5.20

OUTPUT VOLTAGE

vs. LOAD CURRENT

MAX6765 toc07

OUTPUT VOLTAGE (V)

20 40 60 80 100

LOAD CURRENT (mA)

03010 50 70 90

VOUT = 5V

OUTPUT VOLTAGE

vs. LOAD CURRENT

MAX6765 toc08

3.22

3.20

3.24

3.30

3.32

3.28

3.26

3.34

OUTPUT VOLTAGE (V)

20 40 60 80 100

LOAD CURRENT (mA)

03010 50 70 90

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

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VIN = 14V, COUT = 10µF, CIN = 0.1µF, TA= +25°C, unless otherwise noted.)

OUTPUT VOLTAGE

vs. LOAD CURRENT

MAX6765 toc09

OUTPUT VOLTAGE (V)

1.79

1.77

1.76

1.75

1.78

1.80

1.83

1.84

1.82

1.81

1.85

20 40 60 80 100

LOAD CURRENT (mA)

03010 50 70 90

VOUT = 1.8V

100

120

140

160

0 25 50 75 100 125

RESET TIMEOUT PERIOD

vs. CAPACITOR VALUE

MAX6765 toc10

CAPACITOR VALUE (nF)

RESET TIMEOUT PERIOD (ms)

0.94

0.96

1.08

1.00

0.98

1.02

1.04

1.06

1.10

-40 -10 5 20-25 35 50 9580 11065 125

NORMALIZED RESET TIMEOUT PERIOD

vs. TEMPERATURE

MAX6765 toc11

TEMPERATURE (°C)

NORMALIZED RESET TIMEOUT PERIOD

NORMALIZED WATCHDOG TIMEOUT

vs. TEMPERATURE

MAX6765 toc12

0.90

0.92

1.04

0.96

0.94

0.98

1.00

1.02

1.06

-40 -10 5 20-25 35 50 9580 11065 125

TEMPERATURE (°C)

NORMALIZED WATCHDOG TIMEOUT

1.0

0.5

2.0

1.5

2.5

3.0

3.5

4.0

010155 2025303540

RESET OUTPUT vs. SINK CURRENT

MAX6765 toc13

SINK CURRENT (mA)

RESET OUTPUT (V)

VOUT = 5V

1.0

0.5

1.5

2.0

2.5

3.0

3.5

4.0

4.5

5.0

5.5

4 8 12 16

MAX6765 toc14

SOURCE CURRENT (mA)

RESET OUTPUT (V)

621014

RESET OUTPUT vs. SOURCE CURRENT

VOUT = 5V

0.001 0.01 0.1 1 10 100

SUPPLY CURRENT

vs. WATCHDOG INPUT FREQUENCY

MAX6765 toc15

WATCHDOG INPUT FREQUENCY (kHz)

SUPPLY CURRENT (µA)

VOUT = 5V

ENABLE

5V/div

GATE

5V/div

HOLD

5V/div

OUT

5V/div

OUT AND HOLD vs. ENABLE

MAX6765 toc16

20ms/div

(SEE TEST CIRCUIT FOR ENABLE AND HOLD)

MAX6765–MAX6774

Automotive Micropower Linear Regulators

with Supervisor

_______________________________________________________________________________________ 7

-180

-160

-140

-120

-100

-80

-60

-40

-20

POWER-SUPPLY REJECTION RATIO

vs. FREQUENCY

FREQUENCY (Hz)

0.1 1k 10k 100k101 100 1M

POWER-SUPPLY REJECTION RATIO (dB)

MAX6765 toc17

0.9980

0.9990

0.9985

1.0000

0.9995

1.0005

1.0010

1.0015

1.0020

4202812 36 44 52 60 68

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 RESPONSE

MAX6765 toc19

100ms/div

VOUT = 5V

OUT

(AC-COUPLED)

1V/div

VIN

10V/div

LINE-TRANSIENT RESPONSE

MAX6765 toc20

400µs/div

VOUT = 5V

OUT

(AC-COUPLED)

1V/div

VIN

20V/div

LINE-TRANSIENT RESPONSE

MAX6765 toc21

400µs/div

VOUT = 5V

40 80

OUTPUT CAPACITOR SERIES RESISTANCE

vs. LOAD CURRENT

MAX6765 toc22

LOAD CURRENT (mA)

OUTPUT CAPACITOR SERIES RESISTANCE (Ω)

06020 100

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

8 _______________________________________________________________________________________

Pin Description

Enable and Hold Test Circuit

MAX6765/

MAX6766

MAX6767/

MAX6768

MAX6769/

MAX6770

MAX6771/

MAX6772

MAX6773/

MAX6773B/

MAX6774/

MAX6774B

NAME

FUNCTION

1111 1IN

Regulator Input. Bypass IN to GND with a capacitor

with a minimum value of 0.1µF.

2 2 2 2 2 GND Ground

333—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.

4555 5

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.

5777 7

TIMEOUT

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.

6 8 8 8 8 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).

GND

VIN

ENABLE

GATE

HOLD

OUT

MAX6767

MAX6768

TEST CIRCUIT FOR OUT AND HOLD VS. ENABLE

HOLD

MAX6765–MAX6774

Automotive Micropower Linear Regulators

with Supervisor

_______________________________________________________________________________________ 9

Pin Description (continued)

MAX6765/

MAX6766

MAX6767/

MAX6768

MAX6769/

MAX6770

MAX6771/

MAX6772

MAX6773/

MAX6773B/

MAX6774/

MAX6774B

NAME

FUNCTION

—4———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.

— 6 6 6 6 SET

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— —

RESETIN

Adjustable 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 EP EP EP EP —

Exposed Paddle. 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 Description

The 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

10 ______________________________________________________________________________________

Functional Diagrams

MAX6765/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

______________________________________________________________________________________ 11

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

MAX6765–MAX6774

Automotive Micropower Linear Regulators

with Supervisor

12 ______________________________________________________________________________________

Functional Diagrams (continued)

MAX6769/MAX6770

THERMAL

PROTECTION

CONTROL

LOGIC

116mV

OUT

SET

RESET

GND

OVERCURRENT

PROTECTION

RESET

TIMEOUT

RESETIN

ENABLE

TIMEOUT

1.233V

1.147V

1.085V

MAX6765–MAX6774

Automotive Micropower Linear Regulators

with Supervisor

______________________________________________________________________________________ 13

Functional Diagrams (continued)

MAX6771/MAX6772

THERMAL

PROTECTION

CONTROL

LOGIC

OUT

RESET

GND

OVERCURRENT

PROTECTION

RESET

TIMEOUT

ENABLE1

TIMEOUT

ENABLE2

116mV

SET

1.233V

1.147V

1.085V

MAX6765–MAX6774

Automotive Micropower Linear Regulators

with Supervisor

14 ______________________________________________________________________________________

Functional Diagrams (continued)

MAX6773/MAX6773B

MAX6774/MAX6774B

THERMAL

PROTECTION

CONTROL

LOGIC

OUT

RESET

GND

OVERCURRENT

PROTECTION

RESET

TIMEOUT

ENABLE

TIMEOUT WDI

116mV

SET

1.233V

1.147V

1.085V

MAX6765–MAX6774

Automotive Micropower Linear Regulators

with Supervisor

______________________________________________________________________________________ 15

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.

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 pos-

sible to implement a self-holding circuit without external

components. Forcing ENABLE low with HOLD high (or

unconnected) places the MAX6767/MAX6768 into shut-

down 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/shut-

down switch for the regulator output (OUT).

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 superviso-

ry circuits provide the reset logic to prevent code-exe-

cution 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 volt-

ages. Once the monitored voltage exceeds its respec-

tive reset threshold voltage(s), RESET remains low for

the reset timeout period, then goes high. See Table 1.

RESETIN Threshold (MAX6769/MAX6770)

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.

MAX6767–MAX6774B

SET

GND

VIN

OUT

Figure 1. Setting the Output Voltage Using a Resistive Divider

PART NUMBER

SUFFIX (_)

OUTPUT

VOLTAGE (V)

RESET

THREHOLD (V)

L 5 4.625

M 5 4.375

T 3.3 3.053

S 3.3 2.888

Z 2.5 2.313

Y 2.5 2.188

W 1.8 1.665

V 1.8 1.575

Table 2. Preset Output Voltage and Reset

Threshold

PART NUMBER

SUFFIX (_)

TIMEOUT

PERIOD

D0 75µs

D1 3.125ms

D2 12.5ms

D3 50ms

D4 200ms

Table 1. Preset Timeout Period

MAX6765–MAX6774

Automotive Micropower Linear Regulators

with Supervisor

16 ______________________________________________________________________________________

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 updat-

ed 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 pro-

tects 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

Output Voltage Selection

The MAX6767–MAX6774B feature dual-mode operation:

these devices operate in either a preset or adjustable

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 pre-

set-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 for-

mula to set the desired reset threshold:

VMON = VTH (1 + R3 / R4)

where VTH is 1.085V for the M/S/Y/V versions and

1.147V for L/T/Z/W versions.

MAX6769

MAX6770

RESETRESETIN

R4 GND

VIN

VMON

Figure 2. RESETIN Threshold Selection

OPERATING

STATE

ENABLE

HOLD

REGULATOR

OUTPUT COMMENT

Initial State Low

Don’t care

Off ENABLE is pulled to GND through an internal pulldown. HOLD is

floating (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 allowed to float low by an internal pulldown).

HOLD remains externally pulled low keeping the regulator output on.

Off-State Low High

(floats high)

Off

HOLD is driven high (or allowed to float high by an internal pullup)

while ENABLE is low. Regulator output is shut off and ENABLE/

HOLD logic returns to the initial state.

Table 3. ENABLE/HOLD Truth Table/State Table

MAX6765–MAX6774

Automotive Micropower Linear Regulators

with Supervisor

______________________________________________________________________________________ 17

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 1in2section of

2oz. PCB copper (JESD51-3 AND JESD51-5). Use

Figure 4 to determine the allowable package dissipa-

tion for a given ambient temperature. Alternately, use

the following formula to calculate the allowable pack-

age 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 TAis the ambient tempera-

ture in °C, under the same conditions used for Figure 4.

After determining the allowable package dissipation,

calculate the maximum output current using the follow-

ing formula:

PD < PDMAX where PD = [(VIN - VOUT) x IOUT]

Also, IOUT should be ≤100mA in any case.

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

where tRP is in seconds and CTIMEOUT is in Farads.

Connect TIMEOUT to OUT to select the internally fixed

timeout period. CTIMEOUT 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.

Capacitor Selection and

Regulator Stability

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 power-

supply 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 capaci-

tance to ensure stability at low temperatures. With X7R

or X5R dielectrics, 10µF should be sufficient at all oper-

ating temperatures. For higher-ESR tantalum capaci-

tors, 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.

MAX6765 fig03

TEMPERATURE (°C)

PD (W)

14012080 10040 6020

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

2.2

0 160

DERATE 23.8mW/°C

ABOVE +70°C

1.904W

SAFE OPERATING

AREA

MAX6765 fig04

TEMPERATURE (°C)

PD (W)

14012080 10040 6020

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

2.0

2.2

0 160

DERATE 24.4mW/°C

ABOVE +70°C

1.951W

SAFE OPERATING

AREA

Figure 3. Maximum Power Dissipation vs. Temperature

(MAX6765/MAX6766)

Figure 4. Maximum Power Dissipation vs. Temperature

(MAX6767–MAX6774B)

MAX6765–MAX6774

Ensuring a Valid

RESET

Output Down to

VIN = 0V (MAX6766/MAX6768/MAX6770/

MAX6772/MAX6774/MAX6774B)

When VIN falls below 1V, RESET current-sinking capa-

bilities decline drastically. High-impedance CMOS-

logic 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 criti-

cal; 100kΩis 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.

Automotive Micropower Linear Regulators

with Supervisor

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

MAX6772TASD2+T 3.3 12.5 2.888 +BGC

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

Table 4. Standard Version Part Numbers

MAX6766

MAX6768

MAX6770

MAX6772

MAX6774

MAX6774B

RESET

GND

VIN

Figure 5. Ensuring

RESET

Valid to VIN = 0V

MAX6765–MAX6774

Automotive Micropower Linear Regulators

with Supervisor

______________________________________________________________________________________ 19

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 —

Selector Guide

MAX6766

12V

BATTERY

VCC

I/O

LIN

GND

TIMEOUT

RESET

OUT

ENABLE

µC XCVR

TXD

RXD

RESET

Typical Application Circuit

MAX6765–MAX6774

Automotive Micropower Linear Regulators

with Supervisor

20 ______________________________________________________________________________________

865

OUT

SET

RESET

MAX6767

MAX6768

TIMEOUT

ENABLE

GND

HOLD

TDFN

TOP VIEW

865

OUT

SET

RESET

MAX6769

MAX6770

TIMEOUT

ENABLE

GND

RESETIN

TDFN

TOP VIEW

865

OUT

SET

RESET

MAX6771

MAX6772

TIMEOUT

ENABLE1

GND

ENABLE2

TDFN

TOP VIEW

865

OUT

SET

RESET

MAX6773

MAX6773B

MAX6774

MAX6774B

TIMEOUT

ENABLE

GND

WDI

TDFN

TOP VIEW

Pin Configurations (continued)

MAX6765–MAX6774

Automotive Micropower Linear Regulators

with Supervisor

______________________________________________________________________________________ 21

Chip Information

PROCESS: BiCMOS

PART TEMP

RANGE

PIN-

PACKAGE

PKG

CODE

MAX6767TA_D_+

-40°C to +125°C 8 TDFN-EP*

T833-2

MAX6768TA_D_+

-40°C to +125°C 8 TDFN-EP*

T833-2

MAX6769TA_D_+

-40°C to +125°C 8 TDFN-EP*

T833-2

MAX6770TA_D_+

-40°C to +125°C 8 TDFN-EP*

T833-2

MAX6771TA_D_+

-40°C to +125°C 8 TDFN-EP*

T833-2

MAX6772TA_D_+

-40°C to +125°C 8 TDFN-EP*

T833-2

MAX6773TA_D_+

-40°C to +125°C 8 TDFN-EP*

T833-2

MAX6773BTA_D_+

-40°C to +125°C 8 TDFN-EP*

T833-2

MAX6774TA_D_+

-40°C to +125°C 8 TDFN-EP*

T833-2

MAX6774BTA_D_+

-40°C to +125°C 8 TDFN-EP*

T833-2

Ordering Information (continued)

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 lead-free package.

*EP = Exposed paddle.

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

22 ______________________________________________________________________________________

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.)

6, 8, &10L, DFN THIN.EPS

MAX6765–MAX6774

Automotive Micropower Linear Regulators

with Supervisor

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 ____________________ 23

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.)

COMMON DIMENSIONS

SYMBOL MIN. MAX.

A 0.70 0.80

D 2.90 3.10

E 2.90 3.10

A1 0.00 0.05

L 0.20 0.40

PKG. CODE N D2 E2 eJEDEC SPEC b[(N/2)-1] x e

PACKAGE VARIATIONS

0.25 MIN.k

A2 0.20 REF.

2.00 REF0.25±0.050.50 BSC2.30±0.1010T1033-1

2.40 REF0.20±0.05- - - - 0.40 BSC1.70±0.10 2.30±0.1014T1433-1

1.50±0.10 MO229 / WEED-3

0.40 BSC - - - - 0.20±0.05 2.40 REFT1433-2 14 2.30±0.101.70±0.10

T633-2 6 1.50±0.10 2.30±0.10 0.95 BSC MO229 / WEEA 0.40±0.05 1.90 REF

T833-2 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF

T833-3 8 1.50±0.10 2.30±0.10 0.65 BSC MO229 / WEEC 0.30±0.05 1.95 REF

2.30±0.10 MO229 / WEED-3 2.00 REF0.25±0.050.50 BSC1.50±0.1010T1033-2

Revision History

Pages changed at Rev 1: 1, 21, 23

Pages changed at Rev 2: 1, 4, 8, 9, 14, 16, 18–23

Pages changed at Rev 3: 1, 7, 23