MAX6768TTVD0+ [MAXIM]
Power Supply Support Circuit, Adjustable, 1 Channel, BICMOS, 3 X 3 MM, 0.80 MM HIEGHT, LEAD FREE, MO-229WEEC, TDFN-8;
| 型号： | MAX6768TTVD0+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Power Supply Support Circuit, Adjustable, 1 Channel, BICMOS, 3 X 3 MM, 0.80 MM HIEGHT, LEAD FREE, MO-229WEEC, TDFN-8 信息通信管理 |
| 文件： | 总23页 (文件大小：300K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-0657; Rev 1; 1/07
Automotive Micropower Linear Regulators
with Supervisor
General Description
Features
♦ Low 31µA Quiescent Current
The MAX6765–MAX6774 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.
♦ 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
♦ Adjustable Output Voltages from 1.8V to 11V
♦ Open-Drain or Push-Pull RESET Output
♦ Fixed or Capacitor-Adjustable Reset Timeouts
The MAX6765–MAX6774 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.
♦ 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
These devices provide three regulator enable modes to
accommodate several power-on schemes. The
MAX6765/MAX6766/MAX6769/MAX6770/MAX6773/
MAX6774 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 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.
TEMP
RANGE
PIN-
PACKAGE
PKG
CODE
PART
MAX6765TT_D_+ -40°C to +125°C 6 TDFN-EP*
MAX6766TT_D_+ -40°C to +125°C 6 TDFN-EP*
Ordering Information continued at end of data sheet.
T633-2
T633-2
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.
The MAX6773/MAX6774 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) watchdog timeout period.
Pin Configurations
TOP VIEW
The MAX6765–MAX6774 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.
6
5
4
The MAX6765–MAX6774 are fully specified for a -40°C to
+125°C operating temperature range.
MAX6765
MAX6766
Applications
+
Automotive
Industrial
Telecom
1
2
3
TDFN
Typical Application Circuit and Selector Guide appear at
end of data sheet.
Pin Configurations continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Automotive Micropower Linear Regulators
with Supervisor
ABSOLUTE MAXIMUM RATINGS
(All pins referenced to GND, unless otherwise noted.)
..........................................................................-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
8-Pin TDFN 3mm x 3mm
V
(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
IN
Continuous Power Dissipation (T = +70°C)
A
6-Pin TDFN 3mm x 3mm
(derate 23.8mW/°C above +70°C)...........................1904.8mW
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 = 14V, C = 0.1µF, C
= 10µF, T = T = -40°C to +125°C, unless otherwise noted. Typical values are at T = T = +25°C.)
IN
IN
OUT
A
J
A
J
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
72
UNITS
Supply Voltage Range
V
4
V
IN
I
I
I
I
I
= 0
31
35
37
35
37
45
LOAD
LOAD
LOAD
LOAD
LOAD
= 50mA
50
Supply Current
(MAX6765–MAX6772) (Note 2)
= 100mA, V = 14V
55
µA
IN
= 0, V = 42V
50
IN
= 10mA, V = 42V
IN
55
I
I
I
I
= 0
= 50mA
= 100mA
38
42
44
42
50
55
60
55
LOAD
LOAD
LOAD
LOAD
Supply Current
(MAX6773/MAX6774) (Note 2)
µA
µA
= 0, V = 42V
IN
I
= 10mA, V = 42V
44
3.3
5
60
LOAD
IN
Shutdown Supply Current
Output Voltage
I
ENABLE , ENABLE1, ENABLE2 = GND
L/M, I = 1mA
7
SHDN
4.925
4.850
3.251
3.201
2.463
2.425
1.773
1.746
1.8
5.075
5.150
3.350
3.399
2.538
2.575
1.827
1.854
11.0
LOAD
L/M, 1mA ≤ I
≤ 100mA, V = 11V
5
LOAD
IN
T/S, I
= 1mA
3.3
3.3
2.5
2.5
1.8
1.8
LOAD
T/S, 1mA ≤ I
≤ 100mA, V = 9.3V
IN
LOAD
V
V
OUT
Z/Y, I
= 1mA
LOAD
Z/Y, 1mA ≤ I
≤ 100mA, V = 8.5V
IN
LOAD
W/V, I
= 1mA
LOAD
W/V, 1mA ≤ I
≤ 100mA, V = 7.8V
IN
LOAD
Adjustable Output Voltage Range
V
V
V
OUT
SET Threshold Voltage
(MAX6767–MAX6774)
V
I
= 1mA
1.20
1.233
1.26
SET
LOAD
SET rising
SET falling
116
58
Dual Mode™ SET Threshold
mV
Dual Mode is a trademark of Maxim Integrated Products, Inc.
2
_______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
ELECTRICAL CHARACTERISTICS (continued)
(V = 14V, C = 0.1µF, C
= 10µF, T = T = -40°C to +125°C, unless otherwise noted. Typical values are at T = T = +25°C.)
IN
IN
OUT
A
J
A
J
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
= 1.5V, V = 11V
MIN
TYP
MAX
UNITS
SET Input Current
(MAX6767–MAX6774)
I
V
-100
+100
nA
SET
SET
IN
L/M, 5V output option, I
L/M, 5V output option, I
L/M, 5V output option, I
= 10mA
= 50mA
= 100mA
60
130
630
LOAD
LOAD
LOAD
300
620
866
Dropout Voltage (Note 3)
∆V
mV
DO
1200
1600
T/S, 3.3V output option, I
= 100mA
LOAD
Guaranteed Output Current
(Note 4)
100
150
mA
Output Current Limit
Output shorted to GND, V = 14V
250
160
20
mA
°C
°C
%
IN
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
Line Regulation
6.5V ≤ V ≤ 72V, I
= 1mA
1
IN
LOAD
Load Regulation
(MAX6767–MAX6774)
I
V
= 1mA to 100mA,
OUT
1.5
%
dB
µs
= V
+ 6V
OUT(NOM)
IN
Power-Supply Rejection Ratio
PSRR
I
= 10mA, f = 100Hz, 500mV
P-P
70
LOAD
IN
From ENABLE high to OUT,
I
Startup Response Time
t
180
START
= 100mA
LOAD
Output Overvoltage Protection
Threshold
1.07 x
1.1 x
1.13 x
V
OUT
OV
I
= 1mA (from OUT)
V
TH
SINK
V
V
OUT
OUT
Output Overvoltage Protection
Maximum Sink Current
OUT = OUT
x 1.15
5
10
mA
(NOM)
LOGIC INPUT (ENABLE, ENABLE1, ENABLE2, HOLD)
Input Low Voltage
Input High Voltage
V
ENABLE, ENABLE1, ENABLE2
ENABLE, ENABLE1, ENABLE2
0.4
0.4
V
V
IL
V
1.4
IH
ENABLE, ENABLE1, ENABLE2
Input Pulldown Current
ENABLE, ENABLE1, ENABLE2 are
internally pulled down to GND
0.6
1.8
µA
V
1.8V ≤ V
1.8V ≤ V
≤ 11V
≤ 11V
IL
OUT
OUT
HOLD Input Threshold Voltage
V
OUT -
0.4
V
IH
HOLD Input Pullup Current
HOLD is internally pulled up to OUT
µA
RESET OUTPUT
L
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
M
T
S
Z
Y
W
V
SET = GND,
RESET falling
RESET Threshold
V
_______________________________________________________________________________________
3
Automotive Micropower Linear Regulators
with Supervisor
ELECTRICAL CHARACTERISTICS (continued)
(V = 14V, C = 0.1µF, C
= 10µF, T = T = -40°C to +125°C, unless otherwise noted. Typical values are at T = T = +25°C.)
IN
IN
OUT
A
J
A
J
(Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
L/T/Z/W, SET = resistive divider, RESET
falling
V
V
x
x
V
x
V
x
OUT
OUT
0.9
OUT
0.925
0.950
RESET Threshold (Adjustable
Output Voltage)
V
nA
V
M/S/Y/V, SET = resistive divider, RESET
falling
V
x
V
x
OUT
OUT
0.85
OUT
0.875
0.900
RESETIN Input Current
RESETIN Threshold
RESETIN = GND or 12V
-100
+100
V
= 87.5% of V
(M/S/Y/V),
TH
SET
1.057
1.118
1.085
1.147
1.112
RESET falling
V
= 92.5% of V
(L/T/Z/W),
TH
SET
1.176
RESET falling
OUT to RESET Delay
V
falling
0.3
35
µs
µs
µs
OUT
RESETIN To RESET Delay
RESETIN falling
D0
D1
D2
D3
D4
75
2.187
8.75
35
3.125
12.5
50
4.063
16.25
65
RESET Timeout Period (TIMEOUT
Connected to OUT)
V
rising
OUT
ms
140
200
1000
1.22
260
TIMEOUT Ramp Current
800
1200
1.259
nA
V
TIMEOUT Ramp Threshold
1.160
V
≥ 1.8V, I
= 50µA,
OUT
SINK
0.3
0.4
RESET asserted
RESET Output-Voltage Low
(Open Drain or Push-Pull)
V
V
OL
V
≥ 1.8V, I = 3.2mA,
SINK
OUT
RESET asserted
RESET Output-Voltage High
(Push-Pull)
V
≥ 1.8V, I
= 250µA,
SOURCE
0.8 x
OUT
V
V
OH
RESET not asserted
V
OUT
RESET Open-Drain Leakage
Current
RESET not asserted, RESET = 12V
100
0.4
nA
Watchdog Minimum Input Pulse
Watchdog Input Low Voltage
t
1.8V ≤ V
1.8V ≤ V
≤ 11V
≤ 11V
1
µs
V
WDI
OUT
OUT
V
IL
V
OUT
Watchdog Input High Voltage
V
1.8V ≤ V
1.8V ≤ V
≤ 11V
≤ 11V
V
IH
OUT
OUT
- 0.4V
Watchdog Input Low Voltage
Watchdog Input Current
Watchdog Timeout Period
V
0.4
+1
V
µA
s
IL
I
WDI = 0V or WDI = 12V
-1
WDI
t
1.12
1.6
2.08
WD
Note 1: Production tested at T = +25°C. Overtemperature limits are guaranteed by design.
A
Note 2: Device tested at internally set voltage.
Note 3: Dropout voltage for L/M versions is defined as (V - V
) when V
equals 98% of the nominal value of V
when
IN
OUT
OUT
OUT
V
IN
= 11V. For T/S versions, dropout voltage is defined as (V - V
) when V
equals 98% of the nominal value of V
OUT OUT
IN
OUT
when V = 9.3V.
IN
Note 4: Observe the absolute maximum power dissipation limits.
4
_______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
Typical Operating Characteristics
(V = 14V, C
= 10µF, C = 0.1µF, T = +25°C, unless otherwise noted.)
IN A
IN
OUT
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
SUPPLY CURRENT vs. INPUT VOLTAGE
SUPPLY CURRENT vs. TEMPERATURE
44
42
40
38
36
34
32
30
28
26
24
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
47
45
43
41
39
37
35
33
31
29
27
V
= 3.3V
V
= 5V
OUT
OUT
LIMITED BY POWER
DISSIPATION
I
= 100mA
LOAD
I
= 100mA
LOAD
I
= 50mA
LOAD
I
= 0
LOAD
I
= 1mA
LOAD
I
= 0
LOAD
-40 -25 -10
5
20 35 50 65 80 95 110 125
4
12 20 28 36 44 52 60 68
INPUT VOLTAGE (V)
-40 -25 -10
5
20 35 50 65 80 95 110 125
TEMPERATURE (°C)
TEMPERATURE (°C)
SHUTDOWN SUPPLY CURRENT
vs. INPUT VOLTAGE
NORMALIZED RESETIN THRESHOLD VOLTAGE
vs. TEMPERATURE
1.004
DROPOUT VOLTAGE
vs. LOAD CURRENT
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
600
550
500
450
400
350
300
250
200
150
100
50
V
= 5V
OUT
1.003
1.002
1.001
1.000
0.999
0.998
0.997
0.996
0.995
0.994
0.993
0.992
0
4
12 20 28 36 44 52 60 68
INPUT VOLTAGE (V)
-40 -25 -10
5
20 35 50 65 80 95 110 125
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
TEMPERATURE (°C)
OUTPUT VOLTAGE
vs. LOAD CURRENT
OUTPUT VOLTAGE
vs. LOAD CURRENT
5.20
5.15
5.10
5.05
5.00
4.95
4.90
4.85
4.80
V
= 3.3V
V
= 5V
OUT
OUT
3.34
3.32
3.30
3.28
3.26
3.24
3.22
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
Automotive Micropower Linear Regulators
with Supervisor
Typical Operating Characteristics (continued)
(V = 14V, C
IN
= 10µF, C = 0.1µF, T = +25°C, unless otherwise noted.)
IN A
OUT
OUTPUT VOLTAGE
vs. LOAD CURRENT
RESET TIMEOUT PERIOD
vs. CAPACITOR VALUE
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE
1.85
1.84
1.83
1.82
1.81
1.80
1.79
1.78
1.77
1.76
1.75
160
140
120
100
80
1.10
1.08
1.06
1.04
1.02
1.00
0.98
0.96
0.94
V
= 1.8V
OUT
60
40
20
0
0
10 20 30 40 50 60 70 80 90 100
LOAD CURRENT (mA)
0
25
50
75
100
125
-40 -25 -10
5
20 35 50 65 80 95 110 125
CAPACITOR VALUE (nF)
TEMPERATURE (°C)
NORMALIZED WATCHDOG TIMEOUT
vs. TEMPERATURE
RESET OUTPUT vs. SINK CURRENT
RESET OUTPUT vs. SOURCE CURRENT
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
1.06
1.04
1.02
1.00
0.98
0.96
0.94
0.92
0.90
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
V
= 5V
V
= 5V
OUT
OUT
-40 -25 -10
5
20 35 50 65 80 95 110 125
0
5
10 15 20 25 30 35 40
SINK CURRENT (mA)
0
2
4
6
8
10 12 14 16
TEMPERATURE (°C)
SOURCE CURRENT (mA)
SUPPLY CURRENT
vs. WATCHDOG INPUT FREQUENCY
OUT AND HOLD vs. ENABLE
MAX6765 toc16
42
41
40
39
38
37
36
35
34
V
= 5V
OUT
ENABLE
5V/div
GATE
5V/div
HOLD
5V/div
OUT
5V/div
0.001
0.01
0.1
1
10
100
20ms/div
WATCHDOG INPUT FREQUENCY (kHz)
(SEE TEST CIRCUIT FOR ENABLE AND HOLD)
6
_______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
Typical Operating Characteristics (continued)
(V = 14V, C
= 10µF, C = 0.1µF, T = +25°C, unless otherwise noted.)
IN A
IN
OUT
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
NORMALIZED OUT VOLTAGE
vs. INPUT VOLTAGE
1.0020
1.0015
1.0010
1.0005
1.0000
0.9995
0.9990
0.9985
0.9980
40
20
V
= 3.3V
OUT
0
-20
-40
-60
-80
-100
-120
-140
-160
-180
0.1
1
10 100 1k
FREQUENCY (Hz)
10k 100k 1M
4
12 20 28 36 44 52 60 68
INPUT VOLTAGE (V)
LOAD-TRANSIENT RESPONSE
LINE-TRANSIENT RESPONSE
MAX6765 toc19
MAX6765 toc20
V
= 5V
V
= 5V
OUT
OUT
OUT
(AC-COUPLED)
1V/div
OUT
(AC-COUPLED)
200mV/div
V
IN
I
OUT
10V/div
100mA/div
100ms/div
400µs/div
LINE-TRANSIENT RESPONSE
SERIES RESISTANCE vs. LOAD CURRENT
MAX6765 toc21
11
10
9
V
= 5V
OUT
OUT
(AC-COUPLED)
1V/div
8
7
6
STABLE OPERATING
REGION
5
4
3
2
V
IN
20V/div
1
0
400µs/div
0
20
40 60
80 100
LOAD CURRENT (mA)
_______________________________________________________________________________________
7
Automotive Micropower Linear Regulators
with Supervisor
Enable and Hold Test Circuit
V
IN
IN
ENABLE
ENABLE
HOLD
MAX6767
MAX6768
OUT
OUT
HOLD
GND
GATE
N
TEST CIRCUIT FOR OUT AND HOLD VS. ENABLE
Pin Description
PIN
NAME
FUNCTION
MAX6765/ MAX6767/ MAX6769/ MAX6771/ MAX6773/
MAX6766 MAX6768 MAX6770 MAX6772 MAX6774
Regulator Input. Bypass IN to GND with a capacitor
with a minimum value of 0.1µF.
1
2
1
2
1
2
1
2
1
2
IN
GND
Ground
Active-High Enable Input. Drive ENABLE high to turn on
3
3
3
—
3
ENABLE the regulator. ENABLE is internally connected to GND
through a 0.6µA current sink.
Active-Low, Open-Drain/Push-Pull Reset Output.
For the MAX6769/MAX6770, RESET asserts when
RESETIN is below the internal V and deasserts when
TH
RESETIN is above the internal V threshold.
TH
4
5
5
5
5
RESET
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.
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.
5
6
7
8
7
8
7
8
7
8
TIMEOUT
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).
8
_______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
Pin Description (continued)
PIN
NAME
FUNCTION
MAX6765/ MAX6767/ MAX6769/ MAX6771/ MAX6773/
MAX6766 MAX6768 MAX6770 MAX6772 MAX6774
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.
—
—
4
6
—
6
—
6
—
6
HOLD
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.
SET
Adjustable Reset Threshold Input. Connect to a
resistive divider to set the desired threshold.
—
—
—
—
4
—
3
—
—
RESETIN
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.
—
Active-High Enable Input 2. Drive ENABLE2 high to turn
—
—
—
—
—
—
4
—
4
ENABLE2 on the regulator. ENABLE2 is internally connected to
ground through a 0.6µA current sink.
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
—
WDI
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.
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.
EP
EP
EP
EP
EP
—
+1.8V, +2.5V, +3.3V, and +5V. The output voltage of the
MAX6767–MAX6774 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) watch-
dog 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.
Detailed Description
The MAX6765–MAX6774 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–MAX6774 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
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.
_______________________________________________________________________________________
9
Automotive Micropower Linear Regulators
with Supervisor
Functional Diagrams
THERMAL
PROTECTION
MAX6765/MAX6766
OUT
IN
OVERCURRENT
PROTECTION
CONTROL
LOGIC
ENABLE
1.147V
OR
RESET
TIMEOUT
RESET
1.233V
1.085V
TIMEOUT
GND
10 ______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
Functional Diagrams (continued)
THERMAL
PROTECTION
MAX6767/MAX6768
OUT
IN
OVERCURRENT
PROTECTION
ENABLE
HOLD
CONTROL
LOGIC
SET
116mV
1.147V
OR
RESET
TIMEOUT
RESET
1.233V
1.085V
TIMEOUT
GND
______________________________________________________________________________________ 11
Automotive Micropower Linear Regulators
with Supervisor
Functional Diagrams (continued)
THERMAL
PROTECTION
MAX6769/MAX6770
OUT
IN
OVERCURRENT
PROTECTION
CONTROL
LOGIC
ENABLE
SET
116mV
1.147V
RESET
RESET
1.233V
TIMEOUT
OR
1.085V
RESETIN
TIMEOUT
GND
12 ______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
Functional Diagrams (continued)
THERMAL
PROTECTION
MAX6771/MAX6772
OUT
IN
OVERCURRENT
PROTECTION
ENABLE1
ENABLE2
CONTROL
LOGIC
SET
116mV
1.147V
OR
RESET
TIMEOUT
1.233V
RESET
1.085V
TIMEOUT
GND
______________________________________________________________________________________ 13
Automotive Micropower Linear Regulators
with Supervisor
Functional Diagrams (continued)
THERMAL
PROTECTION
MAX6773/MAX6774
OUT
IN
OVERCURRENT
PROTECTION
CONTROL
LOGIC
ENABLE
SET
116mV
1.147V
RESET
TIMEOUT
RESET
1.233V
OR
1.085V
TIMEOUT WDI
GND
14 ______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
Regulator
The regulator accepts an input voltage from +4V to +72V.
V
IN
All of the devices feature fixed output-voltage options of
+1.8V, +2.5V, +3.3V, and +5V. The MAX6767–MAX6774
feature an adjustable output voltage set with an external
resistive-divider network connected between OUT, SET,
and GND. See Figure 1.
IN
OUT
R1
R2
Enable and Hold Inputs
(MAX6767/MAX6768)
MAX6767–MAX6774
SET
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.
GND
Figure 1. Setting the Output Voltage Using a Resistive Divider
Table 1. Preset Timeout Period
PART NUMBER
SUFFIX (_)
TIMEOUT
PERIOD
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).
D0
D1
D2
D3
D4
75µs
3.125ms
12.5ms
50ms
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–MAX6774 supervisory
circuits provide the reset logic to prevent code-execu-
tion 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.
200ms
Table 2. Preset Output Voltage and Reset
Threshold
PART NUMBER
SUFFIX (_)
OUTPUT
VOLTAGE (V)
RESET
THREHOLD (V)
L
M
T
5
4.625
4.375
3.053
2.888
2.313
2.188
1.665
1.575
5
3.3
3.3
2.5
2.5
1.8
1.8
RESETIN Threshold (MAX6769/MAX6770)
S
The MAX6769/MAX6770 monitor the voltage on RESETIN
Z
using an adjustable reset threshold (V ) set with
RESETIN
Y
an external resistive voltage-divider and the internal reset
threshold V . See Table 2.
W
V
TH
______________________________________________________________________________________ 15
Automotive Micropower Linear Regulators
with Supervisor
Table 3. ENABLE/HOLD Truth Table/State Table
OPERATING
STATE
REGULATOR
OUTPUT
ENABLE
Low
HOLD
Don’t care
Don’t care
Low
COMMENT
ENABLE is pulled to GND through an internal pulldown. HOLD is
floating (pulled up to OUT). Regulator output is disabled.
Initial State
Off
On
On
On
ENABLE is externally driven high turning the regulator output on.
Turn-On State
High
HOLD is pulled up by OUT.
Hold
Setup State
HOLD is externally pulled low while ENABLE remains high (latches
HOLD state).
High
ENABLE is driven low (or allowed to float low by an internal pulldown).
HOLD remains externally pulled low keeping the regulator output on.
Hold State
Off-State
Low
Low
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.
High
(floats high)
Low
Off
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 out-
put voltage using the following equation:
Watchdog Timer (MAX6773/MAX6774)
The MAX6773/MAX6774 include a watchdog timer that
asserts RESET if the watchdog input (WDI) does not
toggle within the watchdog timeout period t
(1.6s,
WD
typ). RESET remains low for the reset timeout period,
. If the watchdog is not updated for lengthy periods
t
RP
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
V
OUT
= V
(1+ R1/ R2)
SET
where V
= 1.233V and the recommended value for
SET
R2 is 50kΩ (maximum 100kΩ).
WDI with a valid rising or falling edge prior to t
(min)
WD
RESETIN Threshold Selection
= 1.12s. The watchdog counter clears when WDI tog-
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:
gles prior to t
or when RESET asserts. The watchdog
WD
resumes counting after RESET deasserts. The watch-
dog timer cannot be disabled.
Thermal Protection
When the junction temperature exceeds T = +160°C
J
V
MON
= V (1+ R3/ R4)
TH
(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–MAX6774 in the event of a fault con-
dition. Never exceed the absolute maximum junction
where V
is 1.085V for the M/S/Y/V versions and
TH
1.147V for L/T/Z/W versions.
V
MON
V
IN
IN
R3
MAX6769
MAX6770
temperature rating of T = +150°C. See Figures 3 and 4
J
for the safe operating area.
RESETIN
RESET
Applications Information
R4
GND
Output Voltage Selection
The MAX6767–MAX6774 feature dual-mode operation:
these devices operate in either a preset or adjustable
Figure 2. RESETIN Threshold Selection
16 ______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
Available Output-Current Calculation
The MAX6765–MAX6774 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–MAX6774, respectively. The
graph assumes that the exposed metal pad of the
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.
6
t
= C
x 1.22 x 10 Ω
RP
TIMEOUT
where t is in seconds and C
is in Farads.
RP
TIMEOUT
2
device package is soldered to a solid 1in section of
Connect TIMEOUT to OUT to select the internally fixed
timeout period. C must be a low-leakage
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:
TIMEOUT
(< 10nA) type capacitor. Ceramic capacitors are rec-
ommended; do not use capacitor values lower than
100pF to avoid the influence of parasitic capacitances.
Capacitor Selection and
Regulator Stability
PD
= Max. Power Dissip = 1.951W, for T ≤ +70°C
A
MAX
PD
= Max. Power Dissip = [1.9W - 0.0244W x
MAX
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.
(T - 70°C)], for +70°C < T ≤ +125°C
A
A
where 0.0244W is the MAX6767–MAX6774 package
thermal derating in W/°C and T is the ambient tempera-
A
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 < PD
where PD = [(V - V
) x I
]
OUT
MAX
IN
OUT
Also, I
should be ≤ 100mA in any case.
OUT
2.2
2.2
1.951W
1.904W
2.0
1.8
1.6
2.0
1.8
1.6
DERATE 24.4mW/°C
ABOVE +70°C
DERATE 23.8mW/°C
ABOVE +70°C
SAFE OPERATING
AREA
1.4
1.2
1.0
0.8
1.4
1.2
1.0
0.8
SAFE OPERATING
AREA
0.6
0.4
0.2
0
0.6
0.4
0.2
0
0
20 40 60 80 100 120 140 160
0
20 40 60 80 100 120 140 160
TEMPERATURE (°C)
TEMPERATURE (°C)
Figure 3. Maximum Power Dissipation vs. Temperature
(MAX6765/MAX6766)
Figure 4. Maximum Power Dissipation vs. Temperature
(MAX6767–MAX6774)
______________________________________________________________________________________ 17
Automotive Micropower Linear Regulators
with Supervisor
Ensuring a Valid RESET Output Down to
IN
V
V
= 0V (MAX6766/MAX6768/MAX6770/
MAX6772/MAX6774)
IN
When V falls below 1V, RESET current-sinking capa-
IN
IN
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; 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
MAX6766
MAX6768
MAX6770
MAX6772
MAX6774
RESET
GND
requiring valid logic for V down to 0V.
IN
Figure 5. Ensuring RESET Valid to V = 0V
IN
Table 4. Standard Version Part Numbers
OUTPUT
VOLTAGE (V)
RESET TIMEOUT
PERIOD (ms)
RESET THRESHOLD
PART
TOP MARK
(V)
4.625
2.888
4.625
2.888
4.625
2.888
4.625
2.888
4.625
2.888
4.625
2.888
4.625
2.888
4.625
2.888
4.625
2.888
4.625
2.888
MAX6765TTLD2+T
MAX6765TTSD2+T
MAX6766TTLD2+T
MAX6766TTSD2+T
MAX6767TALD2+T
MAX6767TASD2+T
MAX6768TALD2+T
MAX6768TASD2+T
MAX6769TALD2+T
MAX6769TASD2+T
MAX6770TALD2+T
MAX6770TASD2+T
MAX6771TALD2+T
MAX6771TASD2+T
MAX6772TALD2+T
MAX6772TASD2+T
MAX6773TALD2+T
MAX6773TASD2+T
MAX6774TALD2+T
MAX6774TASD2+T
5
3.3
5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
12.5
+AQB
+AQL
+ARO
+ARZ
+AVI
3.3
5
3.3
5
+AVS
+AVZ
+AXE
+AYH
+AYQ
+AZS
+BAC
+BEG
+BEQ
+APY
+BGC
+BBG
+AQE
+BCS
+BDC
3.3
5
3.3
5
3.3
5
3.3
5
3.3
5
3.3
5
3.3
18 ______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
Selector Guide
RESET
OUTPUT
WATCHDOG
INPUT
OUTPUT
VOLTAGE
RESETIN
THRESHOLD
ENABLE
INPUTS
PART
HOLD INPUT
MAX6765
MAX6766
MAX6767
MAX6768
MAX6769
MAX6770
MAX6771
MAX6772
MAX6773
MAX6774
Open drain
Push-pull
—
—
—
—
—
—
—
—
√
Fixed
—
—
—
—
√
Single
Single
Single
Single
Single
Single
Dual
—
—
√
Fixed
Open drain
Push-pull
Fixed/Adj
Fixed/Adj
Fixed/Adj
Fixed/Adj
Fixed/Adj
Fixed/Adj
Fixed/Adj
Fixed/Adj
√
Open drain
Push-pull
—
—
—
—
—
—
√
Open drain
Push-pull
—
—
—
—
Dual
Open drain
Push-pull
Single
Single
√
Typical Application Circuit
OUT
MAX6766
IN
V
CC
TIMEOUT
RESET
TXD
RXD
12V
BATTERY
GND
LIN
µC
XCVR
ENABLE
RESET
I/O
______________________________________________________________________________________ 19
Automotive Micropower Linear Regulators
with Supervisor
Pin Configurations (continued)
TOP VIEW
TOP VIEW
8
7
6
5
8
7
6
5
MAX6767
MAX6768
MAX6769
MAX6770
+
+
1
2
3
4
1
2
3
4
TDFN
TDFN
TOP VIEW
TOP VIEW
8
7
6
5
8
7
6
5
MAX6771
MAX6772
MAX6773
MAX6774
+
+
1
2
3
4
1
2
3
4
TDFN
TDFN
20 ______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
Chip Information
Ordering Information (continued)
PROCESS: BiCMOS
TEMP
PIN-
PKG
PART
RANGE
PACKAGE
CODE
MAX6767TA_D_+ -40°C to +125°C 8 TDFN-EP*
MAX6768TA_D_+ -40°C to +125°C 8 TDFN-EP*
MAX6769TA_D_+ -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_+ -40°C to +125°C 8 TDFN-EP*
MAX6774TA_D_+ -40°C to +125°C 8 TDFN-EP*
T833-2
T833-2
T833-2
T833-2
T833-2
T833-2
T833-2
T833-2
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.
______________________________________________________________________________________ 21
Automotive Micropower Linear Regulators
with Supervisor
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.)
PACKAGE OUTLINE, 6,8,10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
1
H
21-0137
2
22 ______________________________________________________________________________________
Automotive Micropower Linear Regulators
with Supervisor
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.)
PACKAGE VARIATIONS
COMMON DIMENSIONS
MIN. MAX.
SYMBOL
PKG. CODE
T633-1
N
6
D2
1.50±0.10 2.30±0.10 0.95 BSC
1.50±0.10 2.30±0.10
E2
e
JEDEC SPEC
MO229 / WEEA
MO229 / WEEA
MO229 / WEEC
MO229 / WEEC
MO229 / WEEC
b
[(N/2)-1] x e
1.90 REF
1.90 REF
1.95 REF
1.95 REF
1.95 REF
2.00 REF
2.00 REF
2.40 REF
2.40 REF
0.40±0.05
0.40±0.05
0.30±0.05
0.30±0.05
0.30±0.05
A
0.70
2.90
2.90
0.00
0.20
0.80
3.10
3.10
0.05
0.40
T633-2
6
D
E
0.95 BSC
T833-1
8
1.50±0.10 2.30±0.10 0.65 BSC
1.50±0.10 2.30±0.10 0.65 BSC
1.50±0.10 2.30±0.10 0.65 BSC
T833-2
8
A1
L
T833-3
8
T1033-1
T1033-2
T1433-1
T1433-2
10
10
14
14
1.50±0.10 2.30±0.10 0.50 BSC MO229 / WEED-3 0.25±0.05
k
0.25 MIN.
0.20 REF.
1.50±0.10 2.30±0.10
0.25±0.05
0.20±0.05
0.20±0.05
A2
0.50 BSC MO229 / WEED-3
1.70±0.10 2.30±0.10 0.40 BSC
1.70±0.10 2.30±0.10 0.40 BSC
- - - -
- - - -
PACKAGE OUTLINE, 6,8,10 & 14L,
TDFN, EXPOSED PAD, 3x3x0.80 mm
2
-DRAWING NOT TO SCALE-
H
21-0137
2
Revision History
Pages changed at Rev 1: 1, 21, 23
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
© 2007 Maxim Integrated Products
is a registered trademark of Maxim Integrated Products, Inc.
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