MAX5084/MAX5085
65V, 200mA, Low-Quiescent-Current
Linear Regulators in TDFN
General Description
Features
The MAX5084/MAX5085 high-voltage linear regulators
operate from an input voltage range of 6.5V to 65V and
deliver up to 200mA of output current. These devices
consume only 50μA (typ) of quiescent current with no load
and 6μA (typ) in shutdown (EN pulled low). Both devices
include a SET input, which when connected to ground,
selects a preset output voltage of 5V (MAX5084) or
3.3V (MAX5085). Alternatively, the output voltage can be
adjusted from 2.54V to 11V by connecting the SET pin to
the regulator’s output through a resistive divider network.
The MAX5084/MAX5085 also include an OUT_SENSE
pin, which allows remote voltage sensing right at the
load, thus eliminating the voltage drop caused by the line
impedance. Both devices are short-circuit protected and
include thermal shutdown.
The MAX5084/MAX5085 operate over the -40°C to
+125°C automotive temperature range and are available
in a space-saving 3mm x 3mm thermally enhanced 6-pin
TDFN package.
Applications
●● Wide Operating Input Voltage Range (6.5V to 65V)
●● Thermally Enhanced 3mm x 3mm 6-Pin TDFN
Package Dissipates 1.905W at +70°C
●● Guaranteed 200mA Output Current
●● 50μA No-Load Supply Current
●● Preset 3.3V, 5.0V, or Adjustable (from 2.54V to 11V)
Output Voltage
●● Remote Load Sense
●● Thermal and Short-Circuit Protection
●● -40°C to +125°C Operating Temperature Range
●● SET Input for Adjustable Output Voltage
●● Enable Input
Ordering Information
PART
PINPACKAGE
MAX5084ATT+T
6 TDFN-EP*
AJI
MAX5085ATT+T
6 TDFN-EP*
AJJ
TOP MARK
Note: All devices are specified over the -40°C to +125°C operating temperature range.
*EP = Exposed paddle.
+Denotes lead-free package.
●● Industrial
●● Home Security
●● Telecom/Networking
Selector Guide appears at end of data sheet.
Typical Operating Circuit
Pin Configuration
SET
SET
5
4
MAX5084
MAX5085
LOAD
+
1
IN
GND
OUT_SENSE
6
2
3
EN
EN
OUT_SENSE
10F
MAX5084
MAX5085
GND
OUT
IN
10F
5V (MAX5084)
3.3V (MAX5085)
OUT
TOP VIEW
VIN = 6.5V
TO 65V
TDFN
19-3928; Rev 2; 5/14
MAX5084/MAX5085
65V, 200mA, Low-Quiescent-Current
Linear Regulators in TDFN
Absolute Maximum Ratings
IN to GND...............................................................-0.3V to +80V
EN to GND.............................................................-0.3V to +80V
SET, OUT, OUT_SENSE
to GND...............-0.3V to the lesser of (VIN + 0.3V) or +13.2V
OUT_SENSE to OUT............................................-0.3V to +0.3V
Short-Circuit Duration (VIN ≤ 65V).............................Continuous
Maximum Current into Any Pin (except IN and OUT).......±20mA
Continuous Power Dissipation (TA = +70°C)
6-Pin TDFN-EP (derate 23.8mW/°C above +70°C).... 1904.8mW*
Thermal Resistance:
θJA....................................................................................42°C/W
θJC...................................................................................8.5°C/W
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
*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
(VIN = 14V, IOUT = 1mA, CIN = COUT = 10μF, VEN = 2.4V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical specifications
are at TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Input Voltage Range
Supply Current
Shutdown Supply Current
SYMBOL
CONDITIONS
VIN
VIN > VOUT + 1.5V
IQ
Measured at GND,
SET = GND
ISHDN
MIN
TYP
6.5
MAX
UNITS
65.0
V
IOUT = 0
51
140
IOUT = 100μA
51
140
IOUT = 200mA
2
4
mA
6
16
µA
VEN ≤ 0.4V
µA
REGULATOR
Guaranteed Output Current
Output Voltage Accuracy
IOUT
VOUT
Output Voltage Range
Dropout Voltage
ΔVDO
Startup Response Time
Line Regulation
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ΔVOUT/
ΔVIN
VOUT = VOUT(NOM) ±4%
200
mA
VIN = 9V to 16V, SET = GND, IOUT = 5mA to 200mA,
OUT_SENSE connected to OUT (MAX5084)
4.8
5.0
5.2
VIN = 6.5V to 21V, SET = GND, IOUT = 5mA to
50mA, OUT_SENSE connected to OUT (MAX5084)
4.85
5.0
5.15
VIN = 9V to 16V, SET = GND, IOUT = 5mA to 50mA,
OUT_SENSE connected to OUT (MAX5084)
4.9
V
VIN = 6.5V, SET = GND, IOUT = 1mA to 200mA,
OUT_SENSE connected to OUT (MAX5084)
3.168
IOUT = 5mA, adjustable output
5.24
5.1
3.300
IOUT = 200mA, VOUT = 5V, MAX5084 (Note 2)
0.9
Rising edge of VIN to rising edge of VOUT,
RL = 500Ω (Note 3)
400
VIN from 8V to 65V
VIN from 14V to 65V
3.432
11.0
V
1.5
V
µs
MAX5084, SET = GND
-1
+1
MAX5085, SET = GND
-0.5
+0.5
Adjustable output from
2.54V to 11V
-0.5
+0.5
mv/V
Maxim Integrated │ 2
MAX5084/MAX5085
65V, 200mA, Low-Quiescent-Current
Linear Regulators in TDFN
Electrical Characteristics (continued)
(VIN = 14V, IOUT = 1mA, CIN = COUT = 10μF, VEN = 2.4V, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical specifications
are at TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Enable Voltage
Enable Input Current
OUT to OUT_SENSE
Internal Resistor
SYMBOL
VEN
IEN
ROUT_
SENSE
CONDITIONS
Regulator on
MIN
TYP
MAX
UNITS
2.4
Regulator off
V
0.4
VEN = 2.4V
0.5
1
VEN = 14V
4
8
VEN = 65V
14
35
8
15
24
Ω
IOUT_SENSE = 10mA
µA
SET Reference Voltage
VSET
IOUT = 10mA
1.220
1.251
1.280
V
SET Input Leakage Current
ISET
VSET = 1.251V
-100
+1
+100
nA
MAX5084, SET = GND
0.3
1
MAX5085, SET = GND
0.3
1
Adjustable output from
2.54V to 11V
0.5
2
Load Regulation
Power-Supply Rejection
Ratio
Short-Circuit Current
ΔVOUT/
ΔIOUT
PSRR
ISC
IOUT from 1mA to
200mA, OUT_SENSE
= OUT
IOUT = 10mA, f = 100Hz, VIN_RIPPLE = 500mVP-P,
VOUT = 5V
VIN = 8V to 14V
VIN = 65V
mV/mA
55
220
340
dB
500
340
mA
Thermal Shutdown
TSHDN
+160
°C
Thermal Shutdown
Hysteresis
THYST
10
°C
Note 1: Specifications at -40°C are guaranteed by design and not production tested.
Note 2: Dropout voltage is defined as (VIN - VOUT) when VOUT is 100mV below the value of VOUT when VIN = VOUT + 3V.
Note 3: Startup time measured from 50% of VIN to 90% of VOUT.
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Maxim Integrated │ 3
MAX5084/MAX5085
65V, 200mA, Low-Quiescent-Current
Linear Regulators in TDFN
Typical Operating Characteristics
(VIN = 14V, CIN = COUT = 10μF, VEN = VIN, TA = +25°C, unless otherwise noted.)
5.0
4.5
90
8
2.5
7
VIN = 14V
60
50
40
VIN = 6.5V
30
1.5
IGND (µA)
3.0
2.0
6
5
4
3
1.0
20
2
0.5
10
1
IOUT = 0
0
0 5 10 15 20 25 30 35 40 45 50 55 60 65
OUTPUT VOLTAGE
vs. TEMPERATURE
GROUND CURRENT
vs. TEMPERATURE
OUTPUT VOLTAGE
vs. LOAD CURRENT AND TEMPERATURE
IOUT = 1mA
5.10
2.25
2.00
1.75
IOUT = 200mA
5.20
5.15
5.10
IGND (A)
IOUT = 10mA
5.00
4.95
VOUT (V)
1.50
5.05
1.25
1.00
0.75
4.90
4.85
0.50
4.80
0.25
4.75
0
-40 -25 -10 5 20 35 50 65 80 95 110 125 140
5.05
IOUT = 50mA
5.00
4.95
4.90
IOUT = 100mA
IOUT = 100mA
IOUT = 200mA
4.85
4.80
IOUT = 50mA
-40 -25 -10 5 20 35 50 65 80 95 110 125 140
4.75
-40 -25 -10 5 20 35 50 65 80 95 110 125 140
TEMPERATURE (°C)
TEMPERATURE (°C)
TEMPERATURE (°C)
DROPOUT VOLTAGE
vs. LOAD CURRENT
POWER-SUPPLY REJECTION RATIO
vs. FREQUENCY
LINE-TRANSIENT RESPONSE
1.35
1.20
-10
1.05
PSRR (dB)
0.90
0.75
0.60
0.45
IOUT = 10mA
MAX5084 toc09
MAX5084 toc08
VOUT = 5V
0
MAX5084 toc07
1.50
-20
IOUT
100mA/div
-30
0A
-40
VOUT
100mV/div
AC-COUPLED
-50
-60
0.30
-70
0.15
0
5.25
MAX5084 toc06
TEMPERATURE (°C)
5.20
5.15
-40 -25 -10 5 20 35 50 65 80 95 110 125 140
TEMPERATURE (°C)
MAX5084 toc05
5.25
0
-40 -25 -10 5 20 35 50 65 80 95 110 125 140
VIN (V)
MAX5084 toc04
0
VOUT (V)
9
70
3.5
IGND (µA)
VOUT (V)
4.0
VDROPOUT (V)
VIN = 65V
80
10
SHUTDOWN SUPPLY CURRENT
vs. TEMPERATURE
MAX5084 toc03
100
MAX5084 toc01
5.5
NO-LOAD GROUND CURRENT
vs. TEMPERATURE
MAX5084 toc02
OUTPUT VOLTAGE
vs. INPUT VOLTAGE
10 30
50
70 90 110 130 150 170 190
IOUT (mA)
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-80
0.1
1
10
100
1000
400µs/div
FREQUENCY (kHz)
Maxim Integrated │ 4
MAX5084/MAX5085
65V, 200mA, Low-Quiescent-Current
Linear Regulators in TDFN
Typical Operating Characteristics (continued)
(VIN = 14V, CIN = COUT = 10μF, VEN = VIN, TA = +25°C, unless otherwise noted.)
INPUT VOLTAGE STEP RESPONSE
STARTUP RESPONSE
MAX5084 toc10
ENABLE STARTUP RESPONSE
MAX5084 toc11
MAX5084 toc12
IOUT = 10mA
VIN = 14V
IOUT = 0
VIN
20V/div
VEN
1V/div
VOUT
2V/div
0V
0V
0V
VOUT
500mV/div
AC-COUPLED
VOUT
2V/div
VIN
50V/div
0V
400µs/div
0V
400µs/div
100µs/div
ENABLE STARTUP RESPONSE
ENABLE STARTUP RESPONSE
MAX5084 toc13
ENABLE STARTUP RESPONSE
MAX5084 toc14
VIN = 14V
IOUT = 200mA
MAX5084 toc15
VIN = 65V
IOUT = 0
VIN = 65V
IOUT = 200mA
VEN
1V/div
VEN
1V/div
0V
VEN
1V/div
0V
VOUT
2V/div
VOUT
2V/div
VOUT
2V/div
0V
0V
0V
100µs/div
100µs/div
SHUTDOWN RESPONSE
GROUND CURRENT DISTRIBUTION
(TA = -40°C)
GROUND CURRENT DISTRIBUTION
(TA = +125°C)
10
VEN
1V/div
0V
VOUT
2V/div
0V
4ms/div
36 UNITS
TESTED
8
NUMBER OF UNITS
VIN = 14V
IOUT = 10mA
6
20
10
5
2
42
43
44
45
46
47
IGND (µA)
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54 UNITS
TESTED
15
4
0
25
NUMBER OF UNITS
MAX5084 toc16
MAX5084 toc17
100µs/div
MAX5084 toc18
0V
48
49
52
0
51
52
53
54
55
58
60
IGND (µA)
Maxim Integrated │ 5
MAX5084/MAX5085
65V, 200mA, Low-Quiescent-Current
Linear Regulators in TDFN
Pin Description
PIN
NAME
FUNCTION
1
IN
Regulator Supply Input. Supply voltage ranges from 6.5V to 65V. Bypass with a 10μF capacitor to GND.
2
EN
Enable Input. Force EN high to turn on the regulator. Pull EN low to place the device in a low-power
shutdown mode. EN has an internal 5MΩ resistor to GND.
3
GND
Ground
4
SET
Feedback Input for Setting the Output Voltage. Connect SET to GND for a fixed 5V output (MAX5084),
or 3.3V output (MAX5085). Connect to a resistive divider from OUT to SET to GND to adjust the output
voltage from 2.54V to 11V.
5
OUT_SENSE
Output Voltage Sensing Input. OUT_SENSE is used to Kelvin sense the output voltage in fixed-output
voltage mode. OUT_SENSE can be left floating or connected directly to the load for accurate load
regulation.
6
OUT
—
EP
Regulator Output. Bypass OUT to GND with a minimum 10μF ceramic capacitor.
Exposed Pad. Connect to GND for heatsinking.
IN
MAX5084
MAX5085
1.251V
REFERENCE
ERROR
AMPLIFIER
OUT
EN
STARTUP
CIRCUITRY
15Ω
OUT_SENSE
5MΩ
MUX
OVERCURRENT
SENSE
THERMAL
SHUTDOWN
SET
INTERNAL
SHUTDOWN
CIRCUITRY
GND
Figure 1. Block Diagram
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Maxim Integrated │ 6
MAX5084/MAX5085
Detailed Description
The MAX5084/MAX5085 are high-voltage linear regulators with a 6.5V to 65V input voltage range. The devices
guarantee 200mA output current and are available with
preset output voltages of 3.3V or 5V. Both devices can
be used to provide adjustable outputs from 2.54V to
11V by connecting a resistive divider from OUT to SET
to GND. Thermal shutdown and short-circuit protection
are provided to prevent damage during overtemperature
and overcurrent conditions. An output sense pin (OUT_
SENSE) provides for Kelvin sensing of the output voltage,
thereby reducing the error caused by internal and external
resistances. An enable input (EN) allows the regulators to
be turned on/off through a logic-level voltage. Driving EN
high turns on the device, while driving EN low places the
device in a low-power shutdown mode. In shutdown, the
supply current reduces to 6μA (typ). Both devices operate over the -40°C to +125°C temperature range and are
available in a 3mm x 3mm, 6-pin TDFN package capable
of dissipating 1.905W at TA = +70°C.
Regulator
The regulator accepts an input voltage range from 6.5Vto
65V. The MAX5084/MAX5085 offer fixed-output voltages
of 5V and 3.3V, respectively. The output voltage is also
adjustable from 2.54V to 11V by connecting an external
resistive divider network between OUT, SET, and GND
(see R1 and R2 in Figure 2). The MAX5084/MAX5085
automatically determine the feedback path depending on
the voltage at SET.
Enable Input (EN)
EN is a logic-level enable input, which turns the MAX5084/
MAX5085 on/off. Drive EN high to turn on the device and
drive EN low to place the device in shutdown. When in
shutdown, the MAX5084/MAX5085 typically draw 6μA
of supply current. EN can withstand voltages up to 65V,
allowing EN to be connected to IN for an always-on operation. EN has an internal 5MΩ resistor to GND.
Remote Sensing (OUT_SENSE)
OUT_SENSE provides for Kelvin sensing of the fixed
output voltage, thus eliminating errors due to the voltage
drop in the trace resistance between OUT and the load.
OUT_SENSE is internally connected to OUT through a
15Ω resistor (Figure 1), and can be left floating when
remote sensing is not required. However, if accurate output voltage regulation at the load is required, then connect
OUT_SENSE directly to the load.
65V, 200mA, Low-Quiescent-Current
Linear Regulators in TDFN
Thermal Protection
When the junction temperature exceeds +160°C, an internal thermal sensor signals the shutdown logic to turn off
the pass transistor and allows the IC to cool. The thermal
sensor turns the pass transistor on again after the junction temperature cools by 10°C. This results in a cycled
output during continuous thermal overload conditions.
Thermal protection protects the MAX5084/MAX5085 in
the event of fault conditions. For continuous operation,
do not exceed the maximum junction temperature rating
of +150°C.
Output Short-Circuit Current Limit
The MAX5084/MAX5085 feature a 340mA current limit.
The output can be shorted to GND for an indefinite period
of time without damage to the device. During a short
circuit, the power dissipated across the pass transistor
can quickly heat the device. When the die temperature
reaches +160°C, the MAX5084/MAX5085 shutdown and
automatically restart after the die temperature cools by
10°C. This results in a pulsed output operation.
Applications Information
Output Voltage Setting
The MAX5084/MAX5085 feature Dual ModeTM operation:
they operate in either a preset output voltage mode or an
adjustable output voltage mode. Connect SET to GND for
preset output voltage operation. In preset mode, internal
feedback resistors set the MAX5084’s internal linear regulator to 5V, and the MAX5085’s internal linear regulator to
3.3V. In adjustable mode, select an output from 2.54V to
11V using a resistive divider (see R1 and R2 in Figure 2)
connected from OUT to SET to GND. In adjustable mode,
first select the resistor from SET to GND (R2) in the 1kΩ
to 100kΩ range. The resistor from OUT to SET (R1) is
then calculated by:
V
R1 =
R2 × OUT − 1
VSET
where VSET = 1.251V.
Available Output Current Calculation
The MAX5084/MAX5085 provide up to 200mA of continuous output current. The input voltage extends to 65V.
Package power dissipation limits the amount of output
current available for a given input/output voltage and
ambient temperature. Figure 3 depicts the maximum
power dissipation curve for these devices.
Dual Mode is a trademark of Maxim Integrated Products, Inc.
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Maxim Integrated │ 7
65V, 200mA, Low-Quiescent-Current
Linear Regulators in TDFN
VIN = 6.5V
TO 65V
OUT
EN
1.6
LOAD
OUT_SENSE
GND
2.0
1.8
10µF
MAX5084
MAX5085
PD (W)
IN
10µF
2.4
2.2
VOUT = 2.5V TO 11V
(200mA)
R1
MAX5084 fig03
MAX5084/MAX5085
MAXIMUM POWER
1.905W
1.4
1.2
DERATE
23.8mW/°C
1.0
0.8
0.6
SET
0.4
0.2
R2
0
-40 -20
0
20
40
60
80 100 120 140
TEMPERATURE (°C)
Figure 2. Adjustable Output Voltage Operation
Figure 3. Calculated Maximum Power Dissipation vs.
Temperature
Use Figure 3 to determine the allowable package dissipation for a given ambient temperature. Alternately, use
the following formula to calculate the allowable package
dissipation:
Find the maximum allowable output current. First calculate package dissipation at the given temperature as
follows:
PD =
1905W for TA ≤ +70°C
1905W – 0.0238W/°C x (TA - +70°C) for +70°C < TA < +125°C
After determining the allowable package dissipation,
calculate the maximum output current using the following
formula:
PD
=
I OUT(MAX)
≤ 200mA
VIN − VOUT
The above equations do not include the negligible power
dissipation from self-heating due to the device’s ground
current.
Example 1:
TA = +85°C
PD = 1.905W – 0.0238W/°C (85°C – 70°C) = 1.548W
Then determine the maximum output current:
I OUT(MAX)
=
1.548W
= 172mA
14V − 15V
Example 2:
TA = +125°C
VIN = 14V
VOUT = 3.3V
Calculate package dissipation at the given temperature
as follows:
PD = 1.905W – 0.0238W/°C (125°C – 70°C) = 596mW
And establish the maximum output current:
VIN = 14V
I=
OUT(MAX)
VOUT = 5V
596mW
= 56mA
14V − 3.3V
Example 3:
TA = +50°C
VIN = 9V
VOUT = 5V
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Maxim Integrated │ 8
65V, 200mA, Low-Quiescent-Current
Linear Regulators in TDFN
Calculate package dissipation at the given temperature
as follows:
300
PD = 1.905W
Find the maximum output current:
1.905W
= 476mA (I OUT(MAX) − 200mA)
9V − 5V
In example 3, the maximum output current is calculated
as 476mA, however, the maximum output current cannot
exceed 200mA.
VOUT = 5V
250
200
IOUT (mA)
I OUT(MAX)
=
MAX5084 fig04
MAX5084/MAX5085
TA +70°C
150
TA = +85°C
100
TA = +125°C
50
Alternately, use Figure 4 to quickly determine allowable
maximum output current for selected ambient temperatures.
0
5
15
25
Output Capacitor Selection and
Regulator Stability
For stable operation over the full temperature range and
with load currents up to 200mA, use a 10μF (min) output capacitor with an ESR < 0.5Ω. To reduce noise and
improve load-transient response, stability, and powersupply rejection, use larger output capacitor values such
as 22μF.
Some ceramic dielectrics exhibit large capacitance and
ESR variations with temperature. For dielectric capacitors such as Z5U and Y5V, use 22μF or more to ensure
stability at temperatures below -10°C. With X7R or X5R
dielectrics, 10μF should be sufficient at all operating temperatures. For high-ESR tantalum capacitors use 22μF
or more to maintain stability. To improve power-supply
rejection and transient response, use a minimum 10μF
capacitor between IN and GND.
35
45
55
65
VIN (V)
Figure 4. Calculated Maximum Output Current vs. Input Voltage
Selector Guide
PART
TEMP RANGE
OUTPUT
VOLTAGE (V)
MAX5084ATT+T
-40°C to +125°C
5 or adjustable
MAX5085ATT+T
-40°C to +125°C
3.3 or adjustable
Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns
(footprints), go to www.maximintegrated.com/packages. Note
that a “+”, “#”, or “-” in the package code indicates RoHS status
only. Package drawings may show a different suffix character, but
the drawing pertains to the package regardless of RoHS status.
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PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
6 TDFN-EP
T633+2
21-0137
90-0058
Maxim Integrated │ 9
MAX5084/MAX5085
65V, 200mA, Low-Quiescent-Current
Linear Regulators in TDFN
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
0
1/06
Initial release
—
1
4/06
Updated Applications Information.
7
2
5/14
Updated Applications and Ordering Information, inserted Revision History
and Package Information.
DESCRIPTION
1, 9
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2014 Maxim Integrated Products, Inc. │ 10
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