19-0657; Rev 3; 9/07
KIT
ATION
EVALU
BLE
AVAILA
Automotive Micropower Linear Regulators
with Supervisor
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.
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
♦
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
Ordering Information
PART
MAX6765TT_D_+
MAX6766TT_D_+
TEMP
RANGE
-40°C to +125°C
-40°C to +125°C
PIN-
PACKAGE
6 TDFN-EP*
6 TDFN-EP*
PKG
CODE
T633-2
T633-2
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
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.
Pin Configurations
RESET
4
3
ENABLE
OUT
TOP VIEW
6
MAX6765
MAX6766
Applications
Automotive
Industrial
Telecom
Typical Application Circuit and Selector Guide appear at
end of data sheet.
+
1
IN
2
GND
TDFN
Pin Configurations continued at end of data sheet.
1
________________________________________________________________
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.
TIMEOUT
5
Automotive Micropower Linear Regulators
with Supervisor
MAX6765–MAX6774
ABSOLUTE MAXIMUM RATINGS
(All pins referenced to GND, unless otherwise noted.)
V
IN
..........................................................................-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 (T
A
= +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
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
(V
IN
= 14V, C
IN
= 0.1µF, C
OUT
= 10µF, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= T
J
= +25°C.)
(Note 1)
PARAMETER
Supply Voltage Range
SYMBOL
V
IN
I
LOAD
= 0
Supply Current
(MAX6765–MAX6772) (Note 2)
I
LOAD
= 50mA
I
LOAD
= 100mA, V
IN
= 14V
I
LOAD
= 0, V
IN
= 42V
I
LOAD
= 10mA, V
IN
= 42V
Supply Current
(MAX6773/MAX6773B/
MAX6774/MAX6774B)
(Note 2)
Shutdown Supply Current
I
SHDN
I
LOAD
= 0
I
LOAD
= 50mA
I
LOAD
= 100mA
I
LOAD
= 0, V
IN
= 42V
I
LOAD
= 10mA, V
IN
= 42V
ENABLE , ENABLE1, ENABLE2 = GND
L/M, I
LOAD
= 1mA
L/M, 1mA
≤
I
LOAD
≤
100mA, V
IN
= 11V
T/S, I
LOAD
= 1mA
Output Voltage
V
OUT
T/S, 1mA
≤
I
LOAD
≤
100mA, V
IN
= 9.3V
Z/Y, I
LOAD
= 1mA
Z/Y, 1mA
≤
I
LOAD
≤
100mA, V
IN
= 8.5V
W/V, I
LOAD
= 1mA
W/V, 1mA
≤
I
LOAD
≤
100mA, V
IN
= 7.8V
Adjustable Output Voltage Range
SET Threshold Voltage
(MAX6767–MAX6774)
Dual Mode™ SET Threshold
V
OUT
V
SET
I
LOAD
= 1mA
SET rising
SET falling
4.925
4.850
3.251
3.201
2.463
2.425
1.773
1.746
1.8
1.20
1.233
116
58
mV
CONDITIONS
MIN
4
31
35
37
35
37
38
42
44
42
44
3.3
5
5
3.3
3.3
2.5
2.5
1.8
1.8
TYP
MAX
72
45
50
55
50
55
50
55
60
55
60
7
5.075
5.150
3.350
3.399
2.538
2.575
1.827
1.854
11.0
1.26
V
V
V
µA
µA
UNITS
V
µA
Dual Mode is a trademark of Maxim Integrated Products, Inc.
2
_______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 14V, C
IN
= 0.1µF, C
OUT
= 10µF, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= T
J
= +25°C.)
(Note 1)
PARAMETER
SET Input Current
(MAX6767–MAX6774)
SYMBOL
I
SET
CONDITIONS
V
SET
= 1.5V, V
IN
= 11V
L/M, 5V output option, I
LOAD
= 10mA
Dropout Voltage (Note 3)
∆V
DO
L/M, 5V output option, I
LOAD
= 50mA
L/M, 5V output option, I
LOAD
= 100mA
T/S, 3.3V output option, I
LOAD
= 100mA
Guaranteed Output Current
(Note 4)
Output Current Limit
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
Line Regulation
Load Regulation
(MAX6767–MAX6774)
Power-Supply Rejection Ratio
Startup Response Time
Output Overvoltage Protection
Threshold
Output Overvoltage Protection
Maximum Sink Current
Input Low Voltage
Input High Voltage
ENABLE, ENABLE1, ENABLE2
Input Pulldown Current
V
IL
HOLD
Input Threshold Voltage
V
IH
HOLD
Input Pullup Current
RESET OUTPUT
L
M
T
RESET
Threshold
SET = GND,
RESET
falling
S
Z
Y
W
V
4.500
4.250
2.970
2.805
2.250
2.125
1.620
1.530
4.625
4.375
3.053
2.888
2.313
2.188
1.665
1.575
4.750
4.500
3.135
2.970
2.375
2.250
1.710
1.620
V
1.8V
≤
V
OUT
≤
11V
HOLD
is internally pulled up to OUT
V
IL
V
IH
PSRR
t
START
OV
TH
6.5V
≤
V
IN
≤
72V, I
LOAD
= 1mA
I
OUT
= 1mA to 100mA,
V
IN
= V
OUT(NOM)
+ 6V
I
LOAD
= 10mA, f
IN
= 100Hz, 500mV
P-P
From ENABLE high to OUT,
I
LOAD
= 100mA
I
SINK
= 1mA (from OUT)
OUT = OUT
(NOM)
x 1.15
1.07 x
V
OUT
5
70
180
1.1 x
V
OUT
10
1.13 x
V
OUT
Output shorted to GND, V
IN
= 14V
100
150
250
160
20
1
1.5
MIN
-100
60
300
620
866
TYP
MAX
+100
130
630
1200
1600
mA
mA
°C
°C
%
%
dB
µs
V
mA
mV
UNITS
nA
MAX6765–MAX6774
LOGIC INPUT (ENABLE, ENABLE1, ENABLE2,
HOLD)
ENABLE, ENABLE1, ENABLE2
ENABLE, ENABLE1, ENABLE2
ENABLE, ENABLE1, ENABLE2 are
internally pulled down to GND
1.8V
≤
V
OUT
≤
11V
OUT -
0.4
1.8
1.4
0.6
0.4
V
µA
0.4
V
V
µA
_______________________________________________________________________________________
3
Automotive Micropower Linear Regulators
with Supervisor
MAX6765–MAX6774
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 14V, C
IN
= 0.1µF, C
OUT
= 10µF, T
A
= T
J
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= T
J
= +25°C.)
(Note 1)
PARAMETER
RESET
Threshold (Adjustable
Output Voltage)
RESETIN Input Current
SYMBOL
CONDITIONS
L/T/Z/W, SET = resistive divider,
RESET
falling
M/S/Y/V, SET = resistive divider,
RESET
falling
RESETIN = GND or 12V
V
TH
= 87.5% of V
SET
(M/S/Y/V),
RESET
falling
RESETIN Threshold
V
TH
= 92.5% of V
SET
(L/T/Z/W),
RESET
falling
OUT to
RESET
Delay
RESETIN To
RESET
Delay
V
OUT
falling
RESETIN falling
D0
RESET
Timeout Period (TIMEOUT
Connected to OUT)
D1
V
OUT
rising
D2
D3
D4
TIMEOUT Ramp Current
TIMEOUT Ramp Threshold
RESET
Output-Voltage Low
(Open Drain or Push-Pull)
RESET
Output-Voltage High
(Push-Pull)
RESET
Open-Drain Leakage
Current
Watchdog Minimum Input Pulse
Watchdog Input Low Voltage
Watchdog Input High Voltage
Watchdog Input Low Voltage
Watchdog Input Current
Watchdog Timeout Period
t
WDI
V
IL
V
IH
V
IL
I
WDI
t
WD
V
OUT
≥
1.8V, I
SINK
= 50µA,
RESET
asserted
V
OL
V
OUT
≥
1.8V, I
SINK
= 3.2mA,
RESET
asserted
V
OUT
≥
1.8V, I
SOURCE
= 250µA,
RESET
not asserted
RESET
not asserted,
RESET
= 12V
1.8V
≤
V
OUT
≤
11V
1.8V
≤
V
OUT
≤
11V
1.8V
≤
V
OUT
≤
11V
1.8V
≤
V
OUT
≤
11V
WDI = 0V or WDI = 12V
MAX6773/MAX6774
MAX6773B/MAX6774B
-1
1.12
40
1.6
50
V
OUT
- 0.4V
0.4
+1
2.08
60
1
0.4
0.8 x
V
OUT
100
2.187
8.75
35
140
800
1.160
1.118
1.147
0.3
35
75
3.125
12.5
50
200
1000
1.22
4.063
16.25
65
260
1200
1.259
0.3
V
0.4
V
nA
µs
V
V
V
µA
s
ms
nA
V
ms
1.176
µs
µs
µs
MIN
V
OUT
x
0.9
V
OUT
x
0.85
-100
1.057
1.085
TYP
V
OUT
x
0.925
V
OUT
x
0.875
MAX
V
OUT
x
0.950
V
V
OUT
x
0.900
+100
1.112
V
nA
UNITS
V
OH
Note 1:
Production tested at T
A
= +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 (V
IN
- V
OUT
) when V
OUT
equals 98% of the nominal value of V
OUT
when
V
IN
= 11V. For T/S versions, dropout voltage is defined as (V
IN
- V
OUT
) when V
OUT
equals 98% of the nominal value of V
OUT
when V
IN
= 9.3V.
Note 4:
Observe the absolute maximum power dissipation limits.
4
_______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
MAX6765–MAX6774
Typical Operating Characteristics
(V
IN
= 14V, C
OUT
= 10µF, C
IN
= 0.1µF, T
A
= +25°C, unless otherwise noted.)
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX6765 toc02
SUPPLY CURRENT vs. INPUT VOLTAGE
42
40
SUPPLY CURRENT (µA)
38
36
34
32
30
28
26
24
4
12
20
28
36
44
52
60
68
INPUT VOLTAGE (V)
I
LOAD
= 0
V
OUT
= 3.3V
LIMITED BY POWER
DISSIPATION
I
LOAD
= 100mA
MAX6765 toc01
SUPPLY CURRENT vs. TEMPERATURE
47
45
43
SUPPLY CURRENT (µA)
41
39
37
35
33
31
29
27
-40 -25 -10 5 20 35 50 65 80 95 110 125
TEMPERATURE (°C)
I
LOAD
= 0
I
LOAD
= 1mA
I
LOAD
= 100mA
I
LOAD
= 50mA
V
OUT
= 5V
5.0
SHUTDOWN SUPPLY CURRENT (µA)
4.5
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
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
4
12
20
28
36
44
52
60
68
INPUT VOLTAGE (V)
MAX6765 toc04
NORMALIZED RESETIN THRESHOLD VOLTAGE
vs. TEMPERATURE
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
TEMPERATURE (°C)
600
550
500
450
400
350
300
250
200
150
100
50
0
0
MAX6765 toc05
DROPOUT VOLTAGE
vs. LOAD CURRENT
V
OUT
= 5V
MAX6765 toc06
NORMALIZED RESETIN THRESHOLD VOLTAGE
-40 -25 -10 5 20 35 50 65 80 95 110 125
DROPOUT VOLTAGE (mV)
SUPPLY CURRENT (µA)
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
OUTPUT VOLTAGE
vs. LOAD CURRENT
MAX6765 toc07
OUTPUT VOLTAGE
vs. LOAD CURRENT
V
OUT
= 5V
3.34
3.32
OUTPUT VOLTAGE (V)
3.30
3.28
3.26
3.24
3.22
3.20
V
OUT
= 3.3V
MAX6765 toc08
5.20
5.15
OUTPUT VOLTAGE (V)
5.10
5.05
5.00
4.95
4.90
4.85
4.80
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)
MAX6765 toc03
44
_______________________________________________________________________________________
5
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