19-0654; Rev 0; 11/06
28V, 100mA, Low-Quiescent-Current LDO
with Reset and Power-Fail Input/Output
General Description
The MAX5091 high-voltage linear regulator is designed
to operate from a +5V to +28V input voltage, and with-
stands up to 40V transients. The device consumes only
45µA of quiescent current at 100µA output current. The
MAX5091 delivers up to 100mA of output current with
low 50mV maximum dropout voltage. The MAX5091
provides an active-low open-drain microprocessor
RESET output. The reset timeout period is programma-
ble and can be set with an external capacitor. The
MAX5091 includes an uncommitted comparator for
input voltage monitoring/power-fail indication. The
device is available with a fixed +5V (MAX5091A) or
+3.3V (MAX5091B) output. The MAX5091 is short-cir-
cuit protected and includes thermal shutdown.
The MAX5091 operates over the -40°C to +125°C auto-
motive temperature range and is available in 8-pin,
thermally enhanced TDFN and SO-EP packages.
Features
♦
+5V to +28V Wide Operating Input Voltage Range
♦
Withstands 40V Input Voltage Transients
♦
Guaranteed 100mA Output Current
♦
45µA Typical Quiescent Current at 100µA Output
Current
♦
Preset +5V (MAX5091A) or +3.3V (MAX5091B)
Output Voltage
♦
Stable with Only 10µF Output Capacitance
♦
RESET Output with Adjustable Timeout Period
♦
Uncommitted Comparator for Voltage
Monitoring/Power-Fail Indication
♦
Output Overload and Short-Circuit Protection
♦
Thermal Shutdown
♦
Available in 8-Pin TDFN (1.95W at T
A
= +70°C) and
8-Pin SO (1.5W at T
A
= +70°C)
♦
Operates Over -40°C to +125°C Automotive
Temperature Range
MAX5091
Applications
Automotive
Industrial
Home Security/Safety
Telecom/Networking
Ordering Information
PART
MAX5091AATA+T
MAX5091AASA+
MAX5091BATA+T
MAX5091BASA+
PIN-
PACKAGE
8 TDFN-8
8 SO-EP*
8 TDFN-8
8 SO-EP*
PRESET V
OUT
(V)
5
5
3.3
3.3
PKG
CODE
T833-2
S8E-14
T833-2
S8E-14
TOP
MARK
+APB
—
+APC
—
Note:
All devices specified for -40°C to +125°C operating temperature range.
+Denotes
lead-free package.
*EP
= Exposed paddle.
Typical Application Circuit
+5V (MAX5091A)/
+3.3V (MAX5091B)
100mA
C
IN
10μF
ON
EN
OFF
SI
R
L
100kΩ
C
CT
0.1μF
CT
GND
SO
RES
R
SO
10kΩ
POWER-
FAIL
μC
RESET
V
S
V
OUT
C
OUT
10μF
MAX5091
R
RES
10kΩ
Pin Configurations
TOP VIEW
V
OUT
8
SO
7
RES
6
GND
5
+5V TO +28V
V
IN
R
H
288kΩ
MAX5091
EXPOSED PADDLE
+
1
V
S
2
SI
3
EN
4
CT
TDFN
(3mm x 3mm)
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.
28V, 100mA, Low-Quiescent-Current LDO
with Reset and Power-Fail Input/Output
MAX5091
ABSOLUTE MAXIMUM RATINGS
V
S
to GND ..............................................................-0.3V to +28V
V
S
to GND (t
≤
1s) ..................................................-0.3V to +40V
V
OUT
to GND ..........................................................-0.3V to +20V
V
S
to OUT ...............................................................-0.3V to +28V
RES,
SO to GND.....................................................-0.3V to +20V
RES,
SO Output Sink Current................................................5mA
V
OUT
Short Circuit (V
S
≤
16V)………… ......................Continuous
EN, SI to GND.........................................................-0.3V to +12V
CT to GND.............................-0.3V to the lower of V
OUT
or +12V
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SO-EP (derate 19.2mW/°C above +70°C) .........1538mW*
Thermal Resistance (θ
JA
)................................................52°C/W
Thermal Resistance (θ
JC
)..................................................6°C/W
8-Pin TDFN-EP (derate 24.4mW/°C above +70°C).....1951mW**
Thermal Resistance (θ
JA
)................................................41°C/W
Thermal Resistance (θ
JC
)...............................................8.3°C/W
Operating Junction Temperature Range ...........-40°C to +125°C
Maximum Junction Temperature .....................................+150°C
Storage Temperature Range .............................-60°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
*As per JEDEC51 Standard (single-layer board).
**As per JEDEC51 Standard (multilayer board).
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 (MAX5091A)
(V
S
= +14V, V
OUT
= 5V, EN unconnected, T
A
= T
J
= -40°C to +125°C, C
IN
= 10µF, C
OUT
= 10µF, unless otherwise noted. Typical
specifications are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
T
A
= +25°C, I
OUT
= 1mA
5.6V
≤
V
S
≤
28V, I
OUT
= 1mA to 50mA (Note 2)
Output Voltage
V
OUT
5.6V
≤
V
S
≤
40V, t
≤
1s, I
OUT
= 1mA to 30mA
(Note 2)
V
S
= +8V, I
OUT
= 1mA to 100mA
I
OUT
= 10mA
Dropout Voltage
V
S
to V
OUT
Difference in
Undervoltage
Line Regulation
Load Regulation
Current Limit
Quiescent Current
V
DP
V
S
= +4.75V
I
OUT
= 50mA
I
OUT
= 100mA
V
IO
V
OL
V
OLO
I
LIM
I
OUT
= 100µA
I
Q
I
OUT
= 300µA
I
OUT
= 100mA
Shutdown Supply Current
Thermal-Shutdown
Temperature
Thermal-Shutdown
Hysteresis
I
SHDN
T
J(SHDN)
ΔT
J(SHDN)
V
EN
≤
+0.4V
Temperature rising
V
S
= +4V, I
OUT
= 35mA
+5.5V
≤
V
S
≤
+28V, I
OUT
= 1mA
1mA
≤
I
OUT
≤
100mA
160
0.6
17
260
46
45
4.5
17
+165
20
MIN
4.95
4.90
4.9
4.9
TYP
5
5
5
5
0.1
0.2
0.3
MAX
5.05
5.10
5.1
5.1
0.25
0.4
0.5
0.4
5
50
400
100
100
10
30
V
mV
mV
mA
µA
mA
µA
°C
°C
V
V
UNITS
2
_______________________________________________________________________________________
28V, 100mA, Low-Quiescent-Current LDO
with Reset and Power-Fail Input/Output
ELECTRICAL CHARACTERISTICS (MAX5091A) (continued)
(V
S
= +14V, V
OUT
= 5V, EN unconnected, T
A
= T
J
= -40°C to +125°C, C
IN
= 10µF, C
OUT
= 10µF, unless otherwise noted. Typical
specifications are at T
A
= +25°C.) (Note 1)
PARAMETER
RESET
Reset Threshold Voltage
Reset Threshold
Hysteresis
Reset Pulse Delay
RES
Output Low Voltage
RES
Output High
Leakage Current
Delay Comparator
Threshold
Delay Comparator
Threshold Hysteresis
SENSE
Sense Threshold
Sense Threshold
Hysteresis
Sense Output
Low Voltage
Sense Output
Leakage Current
Sense Input Current
ENABLE
Enable Voltage
Enable Internal
Pullup Current
V
EN
I
EN
EN = high, regulator on
EN = low, regulator off
EN is internally pulled up to 3.6V (max)
2.4
0.4
3
V
µA
V
SL
I
SH
I
SI
V
SI
≤
1.10V, V
S
≥
4V, R
SO
= 10kΩ to V
OUT
V
SO
= 5V, V
SI
≥
1.5V
V
SI
= 3.3V
-1
V
ST
V
SI
falling
1.10
50
1.16
100
1.24
150
0.4
1
+1
V
mV
V
µA
µA
V
RT
V
RTH
t
RD
V
RL
I
RH
V
CTTH
C
CT
= 100nF, t
R
≥
100µs
V
S
≥
+1.5V,R
RES
= 10kΩ to V
OUT
V
RES
= 5V
V
CT
rising
1.9
2.1
100
V
OUT
falling
85
30
55
90
65
110
94.5
100
180
0.4
1.0
2.4
%V
OUT
mV
ms
V
µA
V
mV
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5091
_______________________________________________________________________________________
3
28V, 100mA, Low-Quiescent-Current LDO
with Reset and Power-Fail Input/Output
MAX5091
ELECTRICAL CHARACTERISTICS (MAX5091B)
(V
S
= +14V, V
OUT
= 3.3V, EN unconnected, T
A
= T
J
= -40°C to +125°C, C
IN
= 10µF, C
OUT
= 10µF, unless otherwise noted. Typical
specifications are at T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
T
A
= +25°C, I
OUT
= 1mA
5V
≤
V
S
≤
28V, I
OUT
= 1mA to 50mA (Note 2)
Output Voltage
V
OUT
5V
≤
V
S
≤
40V, t < 1s, I
OUT
= 1mA to 30mA
(Note 2)
V
S
= +8V, I
OUT
= 1mA to 100mA
V
S
to V
OUT
Difference in
Undervoltage
Line Regulation
Load Regulation
Current Limit
Quiescent Current
Shutdown Supply
Current
Thermal-Shutdown
Temperature
Thermal-Shutdown
Hysteresis
RESET CIRCUIT
Reset Threshold Voltage
Reset Threshold
Hysteresis
Reset Pulse Delay
RES
Output-Low Voltage
RES
Output-High
Leakage Current
Delay Comparator
Threshold
Delay Comparator
Threshold Hysteresis
V
RT
V
RTH
t
RD
V
RL
I
RH
V
CTTH
C
CT
= 100nF, t
R
≥
100µs
V
S
≥
1.5V, R
RES
= 4kΩ to V
OUT
V
RES
= 3.3V
V
CT
rising
1.9
2.1
100
V
OUT
falling
85
20
55
90
45
105
94.5
80
180
0.4
1.0
2.4
%V
OUT
mV
ms
V
µA
V
mV
V
IO
V
OL
V
OLO
I
LIM
I
OUT
= 100µA
I
Q
I
OUT
= 300µA
I
OUT
= 100mA
I
SHDN
T
J(SHDN)
ΔT
J(SHDN)
V
EN
≤
0.4V
Temperature rising
V
S
= 3.5V, I
OUT
= 35mA
5V
≤
V
S
≤
28V, I
OUT
= 1mA
1mA
≤
I
OUT
≤
100mA
160
MIN
3.267
3.234
3.234
3.234
TYP
3.3
3.3
3.3
3.3
0.2
0.6
11
260
45
45
4.4
17
+165
20
MAX
3.333
3.366
3.366
3.366
0.4
5
40
400
100
100
10
30
V
mV
mV
mA
µA
mA
µA
°C
°C
V
UNITS
4
_______________________________________________________________________________________
28V, 100mA, Low-Quiescent-Current LDO
with Reset and Power-Fail Input/Output
ELECTRICAL CHARACTERISTICS (MAX5091B) (continued)
(V
S
= +14V, V
OUT
= 3.3V, EN unconnected, T
A
= T
J
= -40°C to +125°C, C
IN
= 10µF, C
OUT
= 10µF, unless otherwise noted. Typical
specifications are at T
A
= +25°C.) (Note 1)
PARAMETER
SENSE
Sense Threshold
Sense Threshold
Hysteresis
Sense Output-Low
Voltage
Sense Output
Leakage Current
Sense Input Current
ENABLE
Enable Voltage
Enable Internal
Pullup Current
V
EN
I
EN
EN = high, regulator on
EN = low, regulator off
EN is internally pulled up to 3.6V (max)
2.4
0.4
3
V
µA
V
SL
I
SH
I
SI
V
SI
≤
1.09V, V
S
≥
4V, R
SO
= 10kΩ to V
OUT
V
SO
= 3.3V, V
SI
≥
1.5V
V
SI
= 3.3V
-1
V
ST
V
SI
falling
1.09
50
1.15
100
1.23
150
0.4
1
+1
V
mV
V
µA
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX5091
Note 1:
Limits at T
A
= -40°C are guaranteed by design and not production tested.
Note 2:
Maximum output current is limited by the power dissipation capability of the package.
Typical Operating Characteristics
(Typical
Application Circuit,
V
S
= +14V, C
IN
= 10µF, C
OUT
= 10µF, V
SI
= 0V, V
EN
= +2.4V, V
OUT
= +5V, T
A
= +25°C, unless other-
wise noted.)
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX5091 toc01
OUTPUT VOLTAGE vs. INPUT VOLTAGE
MAX5091 toc02
OUTPUT VOLTAGE vs. OUTPUT CURRENT
5.04
5.02
5.00
MAX5091A
MAX5091 toc03
6
V
OUT
AT NO LOAD, 100μA,
1mA, 10mA, 100mA
5
V
OUT
(V)
MAX5091A
4
V
OUT
AT NO LOAD, 100μA,
1mA, 10mA, 100mA
3
V
OUT
(V)
MAX5091B
V
S
= 14V
V
OUT
(V)
4
2
4.98
4.96
V
S
= 6V
3
1
4.94
4.92
2
0
5
V
S
(V)
10
15
0
0
1
2
3
V
S
(V)
4
5
6
4.90
0.01
0.1
1
I
OUT
(mA)
10
100
_______________________________________________________________________________________
5
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