19-3875; Rev 0; 11/05
High-Voltage, Micropower, Single/Dual
Linear Regulators with Supervisory Functions
General Description
The MAX6791–MAX6796 ultra-low-quiescent-current,
single-/dual-output linear regulators are ideal for auto-
motive applications. The devices offer a wide 5V to 72V
operating input range, allowing them to withstand auto-
motive load-dump conditions while consuming only
68µA. The MAX6791–MAX6794 are dual-output regula-
tors capable of supplying up to 150mA per output. The
MAX6795/MAX6796 offer a single output capable of
delivering up to 300mA. These devices offer standard
output-voltage options (5V, 3.3V, 2.5V, or 1.8V) and can
be adjusted to any voltage from 1.8V to 11V. The
MAX6791–MAX6794 also offer a fixed 5V output.
All devices feature a push-pull or open-drain, active-low
RESET
output with a fixed output reset threshold that is
92.5%/87.5% of the regulator output OUT/OUT1. The
reset output asserts low when OUT/OUT1 drops below
the reset threshold and remains low for the fixed or
capacitor-adjustable reset timeout period after
OUT/OUT1 exceeds the reset threshold.
The MAX6791–MAX6796 provide a watchdog input that
monitors a pulse train from the microprocessor (µP) and
generates reset pulses if the watchdog input remains
high or low for a duration longer than the watchdog
timeout period. All devices are available with either a
fixed watchdog timeout period of 280ms (min) or a peri-
od adjustable with an external capacitor. The
MAX6791/MAX6792 feature a windowed watchdog
timeout period with selectable window ratio. The watch-
dog feature can be disabled.
The MAX6791–MAX6794 provide dual enable inputs
(ENABLE1 and ENABLE2) that control each regulator
independently. The single-output MAX6795/MAX6796
feature one enable input (ENABLE).
All devices include a hold input (HOLD) that aids the
implementation of a self-holding circuit without requir-
ing external components. Once the regulator is
enabled, setting
HOLD
low forces the regulator to
remain on even if ENABLE/ENABLE1 is subsequently
set low. Releasing
HOLD
shuts down the regulator.
The MAX6791–MAX6796 are available in a small, ther-
mally enhanced TQFN package. The 5mm x 5mm
package dissipates up to 2.7W, supporting continuous
regulator operation during high ambient temperatures,
high battery voltage, and high load-current conditions.
The MAX6791–MAX6796 are specified for a -40°C to
+125°C operating temperature range.
♦
Low 68µA Quiescent Current
♦
Wide 5V to 72V Supply Voltage Range
♦
Output Current
Single Output Up to 300mA
Dual Outputs Up to 150mA per Output
♦
Low Dropout Voltage
420mV (typ) at 100mA (Single)
840mV (typ) at 100mA (Dual)
♦
Fixed Output-Voltage Options: 5V, 3.3V, 2.5V,
1.8V, or Adjustable Output (from 1.8V to 11V)
♦
ENABLE and HOLD Functionality
♦
RESET
Output: Open Drain or Push-Pull
♦
Internally Fixed (35µs, 3.125ms, 12.5ms, 50ms, or
200ms) or Capacitor-Adjustable Reset Timeout
Periods
♦
Internally Fixed or Capacitor-Adjustable
Watchdog Timeout Periods
♦
Windowed (Minimum/Maximum) Watchdog Timer
Options (MAX6791/MAX6792)
♦
Watchdog Disable Feature
♦
Thermal, Short-Circuit, and Output Overvoltage
Protection
♦
Fully Specified from -40°C to +125°C
♦
Small, Thermally Enhanced, 5mm x 5mm TQFN
KIT
ATION
EVALU
BLE
AVAILA
Features
MAX6791–MAX6796
Ordering Information
PART
MAX6791
TP_D _+
MAX6792
TP_D _+
MAX6793
TP_ D_+
MAX6794
TP_ D_+
MAX6795
TP_ D_+
TEMP
RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-
PACKAGE
20 TQFN
20 TQFN
20 TQFN
20 TQFN
20 TQFN
PKG
CODE
T2055-4
T2055-4
T2055-4
T2055-4
T2055-4
Applications
Automotive
MAX6796
TP_D _+
-40°C to +125°C
20 TQFN
T2055-4
+Denotes
lead-free package.
For tape-and-reel, add a T after the “+.” Tape-and-reel are
offered in 2.5k increments. The first placeholder “_” designates
preset output-voltage option and preset reset threshold level;
see Table 1. The second placeholder “_ ” designates the reset
timeout period; see Table 2. For example, the MAX6791TPSD3+
indicates a 3.3V output voltage with a reset threshold of 87.5%
at nominal voltage and a 50ms reset timeout period. Samples
are generally held in stock. Nonstandard versions require a 2.5k
minimum order quantity.
Typical Application Circuit, Pin Configurations, and Selector
Guide appear 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.
High-Voltage, Micropower, Single/Dual Linear
Regulators with Supervisory Functions
MAX6791–MAX6796
ABSOLUTE MAXIMUM RATINGS
(All pins referenced to GND, unless otherwise noted.)
IN to GND ...............................................................-0.3V to +80V
ENABLE, ENABLE1, ENABLE2, PFI,
GATEP to GND ...........................................-0.3V to (IN + 0.3V)
GATEP to IN ...........................................................-12V to +0.3V
OUT, OUT1, OUT2,
PFO, RESET
(open-drain versions),
CSRT, CSWT .......................................................-0.3V to +12V
HOLD, RESET
(push-pull versions), WDI, WDS0, WDS1,
WD-DIS, SET, SET1......................-0.3V to (OUT/OUT1 + 0.3V)
OUT, OUT1, OUT2 Short Circuit
to GND....................................................................Continuous
Maximum Current (all pins except IN and OUT_)...............50mA
Continuous Power Dissipation (T
A
= +70°C)
20-Pin TQFN (derate 33.3mW/°C above +70°C) .....2666.7mW
Operating Temperature Range (T
A
) ..................-40°C to +125°C
Junction Temperature (T
J
) .................................................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
= 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
Regulators on (I
LOAD
= 0mA), V
IN
= 8V
V
IN
= 8V, I
LOAD
= 300mA
(MAX6795/MAX6796)
V
IN
= 14V, I
LOAD
= 100mA
(MAX6795/MAX6796)
Regulators on,
OUT/OUT1 =
OUT2 = 5V
V
IN
= 8V, I
LOAD1
= I
LOAD2
= 150mA
(MAX6791–MAX6794)
V
IN
= 14V, I
LOAD1
=
I
LOAD2
= 50mA
(MAX6791–MAX6794)
Regulators on (I
LOAD
= 0mA), V
IN
= 42V
Regulators on (I
LOAD
= 20mA, total)
OUT1/OUT2/OUT = 5V, V
IN
= 42V
Shutdown Supply Current
I
SHDN
Regulators off, V
IN
= 14V
CONDITIONS
MIN
5
68
130
100
TYP
MAX
72
85
220
160
UNITS
V
Supply Current
I
IN
130
220
µA
100
74
100
27
160
95
170
45
µA
2
_______________________________________________________________________________________
High-Voltage, Micropower, Single/Dual Linear
Regulators with Supervisory Functions
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 14V, C
IN
= 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
SYMBOL
CONDITIONS
L/M, I
LOAD
= I
LOAD1
= 1mA
L/M, I
LOAD
= 150mA (MAX6791–MAX6794),
V
IN
= 8V
L/M, I
LOAD
= 300mA (MAX6795/MAX6796),
V
IN
= 8V
T/S, I
LOAD
= I
LOAD1
= 1mA
T/S, I
LOAD
= 150mA (MAX6791–MAX6794),
V
IN
= 6V
V
OUT
/
V
OUT1
T/S, I
LOAD
= 300mA (MAX6795/MAX6796),
V
IN
= 6V
Z/Y, I
LOAD
= I
LOAD1
= 1mA
Z/Y, I
LOAD
= 150mA (MAX6791–MAX6794),
V
IN
= 5.5V
Z/Y, I
LOAD
= 300mA (MAX6795/MAX6796),
V
IN
= 5.5V
W/V, I
LOAD
= I
LOAD1
= 1mA
W/V, I
LOAD
= 150mA (MAX6791–MAX6794),
V
IN
= 5V
W/V, I
LOAD
= 300mA (MAX6795/MAX6796),
V
IN
= 5V
Output Voltage
(MAX6791–MAX6794)
SET/SET1 Threshold Voltage
Adjustable Output Voltage
Dual-Mode™ SET Threshold
SET/SET1 Input Current
V
OUT2
V
SET
V
OUT
SET/SET1 rising
SET/SET1 falling
SET/SET1 = 1V, V
IN
= 11V
L/M, I
LOAD
= 20mA (Note 2)
(MAX6795/
L/M, I
LOAD
= 300mA (Note 2)
MAX6796)
T/S, I
LOAD
= 300mA (Note 3)
(MAX6791–
L/M, I
LOAD
= 10mA (Note 2)
MAX6794)
T/S, I
LOAD
= 150mA (Note 3)
Guaranteed Output Current
(Note 4)
MAX6791–MAX6794, inferred from dropout test
L/M, I
LOAD
= 150mA (Note 2)
-100
84
1200
1700
1000
84
1700
300
150
I
LOAD2
= 1mA
I
LOAD2
= 150mA
I
LOAD
= I
LOAD1
= 1mA, OUT/OUT1 = 5V
MIN
4.858
4.811
4.850
3.206
3.175
3.201
2.429
2.405
2.425
1.748
1.731
1.746
4.858
4.811
1.207
1.8
124
62
+100
130
1800
2400
1800
130
2400
mA
mV
TYP
4.974
4.945
5
3.282
3.263
3.3
2.487
2.472
2.5
1.791
1.780
1.8
4.974
4.945
1.2315
MAX
5.090
5.078
5.150
3.360
3.351
3.399
2.546
2.539
2.575
1.832
1.828
1.854
5.090
5.079
1.256
11.0
V
V
V
mV
nA
V
UNITS
MAX6791–MAX6796
Output Voltage
Dropout Voltage
∆V
DO
MAX6795/MAX6796, inferred from dropout test
Dual Mode is a trademark of Maxim Integrated Products, Inc.
_______________________________________________________________________________________
3
High-Voltage, Micropower, Single/Dual Linear
Regulators with Supervisory Functions
MAX6791–MAX6796
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 14V, C
IN
= 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
Short-Circuit Output Current Limit
(Note 4)
Thermal-Shutdown Temperature
Thermal-Shutdown Hysteresis
Line Regulation
8V
≤
V
IN
≤
72V, I
LOAD
= 1mA
8V
≤
V
IN
≤
72V, I
LOAD
= 10mA
I
OUT
= 1mA to 300mA
(MAX6795/MAX6796)
Load Regulation (Note 5)
I
OUT
= 1mA to 150mA
(MAX6791–MAX6794)
Power-Supply Rejection Ratio
PSRR
I
LOAD
= 10mA, f = 100Hz, V
IN
= 500mV
P-P
I
LOAD
= 300mA, V
OUT
= 5V,
OUT = 90% of its nominal value
Startup Response Time
t
START
I
LOAD
= 150mA, V
OUT
= 5V,
OUT1/OUT2 = 90% of its nominal value
I
SINK
= 1mA from OUT/OUT1/OUT2
V
OUT
= V
OUT
(nominal) x 1.15
I
GATEP
= -100µA, V
IN
= 20V
I
GATEP
= 0, V
IN
= 20V
V
IL
V
IH
Enable is internally pulled down to GND
HOLD
is internally pulled to OUT/OUT1
1.4
0.5
2
5
13.8
8
69
180
µs
360
1.05 x
V
OUT
10
16.3
10
18.8
12
0.4
1.1 x
V
OUT
V
mA
V
V
V
V
µA
µA
1.5
dB
SYMBOL
CONDITIONS
MAX6795/MAX6796, output shorted,
V
IN
= 6V
MAX6791–MAX6794, output shorted,
V
IN
= 6V
MIN
400
200
TYP
480
mA
240
+165
20
1
1
2
%
°C
°C
% of
V
OUT
MAX
UNITS
Output Overvoltage Protection
Threshold
Output Overvoltage Protection
Sink Current
IN to GATEP Clamp Voltage
IN to GATEP Drive Voltage
ENABLE/ENABLE1/ENABLE2/
HOLD
Input-Voltage Low
ENABLE/ENABLE1/ENABLE2/
HOLD
Input-Voltage High
ENABLE/ENABLE1/ENABLE2
Input Pulldown Current
HOLD
Input Pullup Current
OV
TH
4
_______________________________________________________________________________________
High-Voltage, Micropower, Single/Dual Linear
Regulators with Supervisory Functions
ELECTRICAL CHARACTERISTICS (continued)
(V
IN
= 14V, C
IN
= 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 OUTPUT
L
M
T
Reset Threshold (Preset Output
Voltage)
SET/SET1 = GND
S
Z
Y
W
V
L/T/Z/W
Reset Threshold (Adjustable
Output Voltage)
M/S/Y/V
OUT to Reset Delay
V
OUT1
/V
OUT
falling
D0
D1
Reset Timeout Period
(CSRT = OUT/OUT1)
t
RP
V
OUT1
/V
OUT
rising
D2
D3
D4
CSRT Ramp Current
CSRT Ramp Threshold
WATCHDOG INPUT
Normal Watchdog Timeout Period
Fast Watchdog Timeout Period
SET Ratio = 8
Fast Watchdog Timeout Period
SET Ratio = 16
Fast Watchdog Timeout Period
SET Ratio = 64
Fast Watchdog Minimum Period
CSWT Ramp Current
CSWT Ramp Threshold
Undercurrent Threshold for
Watchdog Enable
Undercurrent Threshold for
Watchdog Disable
t
WD2
t
WD1
t
WD1
t
WD1
t
WD0
Adjustable timeout
Adjustable timeout
CSWT = OUT/OUT1 (fixed)
CSWT = 1500pF (adjustable)
CSWT = OUT/OUT1 (fixed)
CSWT = 1500pF (adjustable)
CSWT = OUT/OUT1 (fixed)
CSWT = 1500pF (adjustable)
CSWT = OUT/OUT1 (fixed)
CSWT = 1500pF (adjustable)
280.0
170
37.5
21.95
18.75
10.80
4.68
2.52
2000
800
1.185
7.0
3
1000
1.218
10
5
1250
1.255
13.8
7
400.0
236.2
50.0
29.52
25.0
14.76
6.25
3.69
520.0
290
62.5
36.90
31.25
18.45
7.81
4.62
ms
ms
ms
ms
ns
nA
V
mA
mA
2.187
8.75
35
140
800
1.185
4.500
4.250
2.970
2.805
2.250
2.125
1.620
1.530
0.90 x
V
OUT
0.85 x
V
OUT
4.625
4.375
3.053
2.888
2.313
2.188
1.665
1.575
0.925 x
V
OUT
0.875 x
V
OUT
35
35
3.125
12.5
50
200
1000
1.218
4.063
16.25
65
260
1250
1.255
nA
V
ms
4.750
4.500
3.135
2.970
2.375
2.250
1.710
1.620
0.95 x
V
OUT
0.90 x
V
OUT
µs
µs
V
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX6791–MAX6796
V
_______________________________________________________________________________________
5
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