DATASHEET
ISL78307
FN7658
Rev.4.00
Aug 8, 2019
40V, Low Quiescent Current, 50mA Linear Regulator for Automotive Applications
The ISL78307 is a high voltage, low quiescent current linear
regulator ideally suited for “always-on” and “keep alive”
automotive applications. The ISL78307 operates from an
input voltage of +6V to +40V under normal operating
conditions and operates down to +3V under a cold crank. It
consumes only 18µA of quiescent current at no load on the
adjustable version.
Features
The ISL78307 is available in fixed 3.3V, 5V, and adjustable
output voltage (2.5V to 12V) options. It features an EN pin that
can be used to put the device into a low-quiescent current
shutdown mode where it draws only 1.8µA of supply current.
The device features over-temperature shutdown and current
limit protection.
• 40V tolerant logic level (TTL/CMOS) enable input
The ISL78307 is AEC-Q100 qualified. It is rated across the
-40°C to +125°C automotive temperature range and is
available in an 8 Ld EPSOIC with exposed pad package.
• Thermal shutdown and current limit protection
• Optimized for “always-on” automotive applications
• 18µA typical quiescent current
• Ensured 50mA output current
• Operates through cold crank down to 3V
• 1.8µA of typical shutdown current
• Low dropout voltage of 120mV at 50mA
• Fixed +3.3V, +5.0V and adjustable output voltage options
• Stable operation with 10µF output capacitor
• -40°C to +125°C operating temperature range
• Thermally enhanced 8 Ld exposed pad SOIC package
Applications
• AEC-Q100 qualified
• Automotive
• 6kV ESD HBM rated
• Industrial
• Pb-free (RoHS compliant)
• Telecom
Related Literature
For a full list of related documents, visit our website
• ISL78307 product page
VIN = 14V
CIN
0.1µF
R1
EN
(ISL78307)
VIN = 14V
VOUT = 12V
OUT
IN
COUT
10µF
OUT
IN
COUT
10µF
CIN
0.1µF
ADJ
VOUT = 5V
EN
(ISL78307)
R2
GND
GND
FIGURE 1. TYPICAL APPLICATION - ADJ VERSION
FIGURE 2. TYPICAL APPLICATION - FIXED VERSION
70
QUIESCENT CURRENT (µA)
60
LOAD = 50mA
50
40
30
20
LOAD = 0mA
10
0
-50
0
50
100
150
TEMPERATURE (°C)
FIGURE 3. QUIESCENT CURRENT vs LOAD CURRENT (ADJ VERSION AT UNITY GAIN). VIN = 14V
FN7658 Rev.4.00
Aug 8, 2019
Page 1 of 11
ISL78307
Block Diagram
VIN
EN
CONTROL
LOGIC
+
THERMAL
SENSOR
EA
FET DRIVER
WITH CURRENT
LIMIT
REFERENCE
+
SOFT-START
VOUT
ADJ
GND
Pin Configuration
ISL78307
(8 LD EPSOIC)
TOP VIEW
IN
1
8
OUT
NC
2
7
ADJ/NC
NC
3
6
NC
EN
4
5
GND
Pin Descriptions
PIN NUMBER
PIN NAME
1
IN
Input voltage pin. A minimum 0.1µF X5R/X7R capacitor is required for proper operation.
2, 3, 6
NC
Pins have internal termination and can be left unconnected. Connection to ground is optional.
4
EN
High on this pin enables the device.
5
GND
7
ADJ/NC
8
OUT
EPAD
FN7658 Rev.4.00
Aug 8, 2019
DESCRIPTION
Ground pin.
In the adjustable output voltage option, this pin is connected to the external feedback resistor divider which sets
the LDO output voltage. In the 3.3V and 5V options, this pin is not used and can be connected to ground.
Regulated output voltage. A 10µF X5R/X7R output capacitor is required for stability.
It is recommended to solder the EPAD to the ground plane.
Page 2 of 11
ISL78307
Ordering Information
PART NUMBER
(Notes 2, 3)
PART
MARKING
TEMP. RANGE
(°C)
ENABLE
PIN
OUTPUT
VOLTAGE (V)
TAPE AND REEL
(UNITS) (Note 1)
PACKAGE
(RoHS Compliant)
PKG.
DWG. #
ISL78307FBEAZ
78307 FBEAZ
-40 to +125
Yes
3.3
-
8 Ld EPSOIC
M8.15B
ISL78307FBEAZ-T
78307 FBEAZ
-40 to +125
Yes
3.3
2.5k
8 Ld EPSOIC
M8.15B
ISL78307FBEAZ-T7A
78307 FBEAZ
-40 to +125
Yes
3.3
250
8 Ld EPSOIC
M8.15B
ISL78307FBEBZ
78307 FBEBZ
-40 to +125
Yes
5.0
-
8 Ld EPSOIC
M8.15B
ISL78307FBEBZ-T
78307 FBEBZ
-40 to +125
Yes
5.0
2.5k
8 Ld EPSOIC
M8.15B
ISL78307FBEBZ-T7A
78307 FBEBZ
-40 to +125
Yes
5.0
250
8 Ld EPSOIC
M8.15B
ISL78307FBECZ
78307 FBECZ
-40 to +125
Yes
ADJ
-
8 Ld EPSOIC
M8.15B
ISL78307FBECZ-T
78307 FBECZ
-40 to +125
Yes
ADJ
2.5k
8 Ld EPSOIC
M8.15B
ISL78307FBECZ-T7A
78307 FBECZ
-40 to +125
Yes
ADJ
250
8 Ld EPSOIC
M8.15B
NOTES:
1. See TB347 for details about reel specifications.
2. These Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100% matte tin plate
plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations). Pb-free products are
MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J-STD-020.
3. For Moisture Sensitivity Level (MSL), see the ISL78307 device page. For more information about MSL, see TB363.
FN7658 Rev.4.00
Aug 8, 2019
Page 3 of 11
ISL78307
Absolute Maximum Ratings
Thermal Information
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +45V
IN Pin to GND Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to VCC
OUT Pin to GND Voltage . . . . . . . . . . . . . . . . . . . . . . . . .. . .GND - 0.3V to 16V
EN Pin to GND Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . GND - 0.3V to VCC
Output Short-Circuit Duration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite
ESD Rating
Human Body Model (Tested per JESD22-A114E) . . . . . . . . . . . . . . . . 6kV
Machine Model (Tested per JESD-A115-A) . . . . . . . . . . . . . . . . . . . 350V
Charge Device Model (Tested per AEC-Q100-011) . . . . . . . . . . . . . 2.2kV
Latch-Up (Tested per JESD78B; Class II, Level A) . . . . . . . . . . . . . . . 100mA
Thermal Resistance (Typical)
JA (°C/W) JC (°C/W)
8 Ld EPSOIC Package (Notes 4, 5) . . . . . . .
50
9
Maximum Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . .-65°C to +175°C
Pb-Free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
Ambient Temperature Range . . . . . . . . . . . . . . . . . . . . . . -40°C to +125°C
IN Pin to GND Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+3V to +40V
OUT Pin to GND Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .+2.5V to +12V
EN Pin to GND Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .0V to +40V
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions can adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. JA is measured in free air with the component mounted on a high-effective thermal conductivity test board with “direct attach” features. See TB379.
5. For JC, the “case temp” location is the center of the exposed metal pad on the package underside.
Electrical Specifications
Recommended Operating Conditions, unless otherwise noted. VIN = 14V, IOUT = 1mA, CIN = 0.1μF,
COUT = 10μF, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical specifications are at TA = +25°C. Boldface limits apply across the operating
temperature range, -40°C to +125°C.
PARAMETER
Input Voltage Range
SYMBOL
TEST CONDITIONS
VIN
V
Cold Crank condition
3
40
V
50
VIN = VOUT + VDO
Output Voltage
VOUT
EN = High
VIN = 14V
IOUT = 0.1mA
mA
3.3V version
3.267
3.3
3.333
V
5V version
4.950
5
5.050
V
ADJ pin voltage
1.211
1.223
1.235
V
0.04
0.115
%
0.25
0.5
%
IOUT = 1mA, VOUT = 3.3V
10
38
mV
IOUT = 50mA, VOUT = 3.3V
130
340
mV
Line Regulation
VOUT/VIN
Load Regulation
VOUT/IOUT VIN = VOUT +VDO
IOUT = 100µA to 50mA
3V VIN 40V
IOUT = 1mA
IOUT = 1mA, VOUT = 5V
10
48
mV
IOUT = 50mA, VOUT = 5V
120
350
mV
1.8
3.64
µA
Shutdown Current
ISHDN
EN = LOW
Quiescent Current
IQ
EN = High
VIN = 14V
FN7658 Rev.4.00
Aug 8, 2019
MAX
(Note 8) UNIT
40
IOUT
VDO
TYP
6
Guaranteed Output
Current
Dropout Voltage
(Note 6)
MIN
(Note 8)
IOUT = 0mA, ADJ version, VOUT = VADJ
18
24
µA
IOUT = 1mA, ADJ version, VOUT = VADJ
22
42
µA
IOUT = 10mA, ADJ version, VOUT = VADJ
34
60
µA
IOUT = 50mA, ADJ version, VOUT = VADJ
56
82
µA
IOUT = 0, 3.3V and 5.0V version
22
28
µA
IOUT = 1mA, 3.3V and 5.0V version
27
45
µA
IOUT = 10mA, 3.3V and 5.0V version
37
65
µA
IOUT = 50mA, 3.3V and 5.0V version
62
90
µA
Page 4 of 11
ISL78307
Electrical Specifications
Recommended Operating Conditions, unless otherwise noted. VIN = 14V, IOUT = 1mA, CIN = 0.1μF,
COUT = 10μF, TA = TJ = -40°C to +125°C, unless otherwise noted. Typical specifications are at TA = +25°C. Boldface limits apply across the operating
temperature range, -40°C to +125°C. (Continued)
PARAMETER
Power Supply
Rejection Ratio
SYMBOL
TEST CONDITIONS
PSRR
f = 100Hz; Vin_ripple = 500mVP-P; load = 50mA
VEN_H
VOUT = Off to On
VEN_L
VOUT = On to Off
MIN
(Note 8)
TYP
MAX
(Note 8) UNIT
58
dB
EN FUNCTION
EN Threshold Voltage
EN Pin Current
IEN
EN to Regulation Time
(Note 7)
tEN
1.485
0.935
VOUT = 0V
V
V
0.026
1.65
µA
1.93
ms
PROTECTION FEATURES
Output Current Limit
ILIMIT
VOUT = 0V
Thermal Shutdown
TSHDN
Junction temperature rising
Thermal Shutdown
Hysteresis
THYST
60
118
mA
+165
°C
+20
°C
NOTES:
6. Dropout voltage is defined as (VIN - VOUT) when VOUT is 2% below the value of VOUT when VIN = VOUT + 3V.
7. Enable to Regulation is the time the output takes to reach 95% of its final value with VIN = 14V and EN is taken from VIL to VIH in 5ns. For the
adjustable versions, the output voltage is set at 5V.
8. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
FN7658 Rev.4.00
Aug 8, 2019
Page 5 of 11
ISL78307
Typical Performance Curves
VIN = 14V, IOUT = 1mA, VOUT = 5V, TJ = +25 °C unless otherwise specified.
80
30
+125°C
QUIESCENT CURRENT (µA)
QUIESCENT CURRENT (µA)
70
60
50
40
+25°C
30
-40°C
20
10
0
0
10
20
30
40
20
+25°C
10
5
0
10
LOAD CURRENT (mA)
FIGURE 4. QUIESCENT CURRENT vs LOAD CURRENT
20
INPUT VOLTAGE (V)
30
0.010
% OUTPUT VOLTAGE VARIATION
2.5
VIN = 40V
2.0
1.5
VIN = 14V
1.0
0.5
0
-50
0
50
100
150
TEMPERATURE (°C)
0.005
5V OPTION
0
-0.005
-0.010
-50
3.3V OPTION
0
50
100
TEMPERATURE (°C)
FIGURE 6. SHUTDOWN CURRENT vs TEMPERATURE (EN = 0)
FIGURE 7. OUTPUT VOLTAGE vs TEMPERATURE (LOAD = 50mA)
5.100
OUTPUT VOLTAGE (V)
5.075
EN at 500mV/DIV
5.050
+125°C
+25°C
5.025
5.000
-40°C
4.975
4.950
VOUT at 1V/DIV
4.925
TIME at 500µs/DIV
4.900
40
FIGURE 5. QUIESCENT CURRENT vs INPUT VOLTAGE (NO LOAD)
3.0
SHUTDOWN CURRENT (µA)
-40°C
15
0
50
+125°C
25
0
10
20
30
40
50
LOAD CURRENT (mA)
FIGURE 8. OUTPUT VOLTAGE vs LOAD CURRENT
FN7658 Rev.4.00
Aug 8, 2019
FIGURE 9. START-UP WAVEFORM
Page 6 of 11
150
ISL78307
Typical Performance Curves
VIN = 14V, IOUT = 1mA, VOUT = 5V, TJ = +25 °C unless otherwise specified. (Continued)
70
60
VOUT = 3.3V
PSRR (dB)
50
40
VOUT at 100mV/DIV
VOUT = 5V
30
50mA
20
IOUT at 0mA
10
0
100
TIME at 5ms/DIV
1k
10k
100k
1M
FREQUENCY (Hz)
FIGURE 10. POWER SUPPLY REJECTION RATIO (LOAD = 50mA)
FN7658 Rev.4.00
Aug 8, 2019
FIGURE 11. LOAD TRANSIENT RESPONSE
Page 7 of 11
ISL78307
Functional Description
Output Voltage Setting
Functional Overview
For the adjustable version of the ISL78307, the output voltage is
programmed using an external resistor divider as shown in
Figure 12.
The ISL78307 is a high performance, high voltage, low-dropout
regulator (LDO) with 50mA sourcing capability. The part is
qualified to operate over the -40°C to +125°C automotive
temperature range. Featuring ultra-low quiescent current, it
makes an ideal choice for “always-on” automotive applications. It
works well under a “load-dump condition” where the input
voltage could rise up to 40V. The LDO continues to operate down
to 3V under a “cold-crank” condition. The device also features
current limit and thermal shutdown protection.
Enable Control
The ISL78307 features an enable pin. When it is pulled low, the
IC goes to a shutdown mode. In this condition, the device draws
less than 2µA. Driving the pin high turns the device on.
Current Limit Protection
The ISL78307 has internal current limit functionality to protect
the regulator during fault conditions. During current limit, the
output sources a fixed amount of current largely independent of
the output voltage. If the short or overload is removed from VOUT,
the output returns to normal voltage regulation mode.
Thermal Fault Protection
In the event the die temperature exceeds typically +165°C, the
output of the LDO will shut down until the die temperature cools
down to typically +145°C. The level of power dissipated,
combined with the ambient temperature and the thermal
impedance of the package determine if the junction temperature
exceeds the thermal shutdown temperature. See section on
“Power Dissipation”.
Application Information
Input and Output Capacitors
For the output, a ceramic capacitor (X5R or X7R) with a
capacitance of 10µF is recommended for the ISL78307 to
maintain stability. The ground connection of the output capacitor
should be routed directly to the GND pin of the device and also
placed close to the IC. A minimum of 0.1µF (X5R or X7R) is
recommended at the input.
FN7658 Rev.4.00
Aug 8, 2019
OUT
IN
CIN
0.1µF
COUT
10µF
R1
EN
(ISL78307)
ADJ
R2
GND
FIGURE 12. ADJUSTABLE VERSION
The output voltage is calculated using Equation 1:
R
V OUT = 1.223V ------1- + 1
R2
(EQ. 1)
Power Dissipation
The junction temperature must not exceed the range specified in
“Recommended Operating Conditions” on page 4. The power
dissipation can be calculated using Equation 2:
P D = V IN – V OUT I OUT + V IN I GND
(EQ. 2)
The maximum allowable junction temperature, TJ(MAX) and the
maximum expected ambient temperature, TA(MAX) determine the
maximum allowable junction temperature rise (TJ), as shown in
Equation 3:
T J = T J MAX – T A MAX
(EQ. 3)
To calculate the maximum ambient operating temperature, use
the junction-to-ambient thermal resistance (JA) as shown in
Equation 4:
T J MAX = P D MAX x JA + T A
(EQ. 4)
Board Layout Recommendations
A good PCB layout is important to achieve expected
performance. Consideration should be taken when placing the
components and routing the trace to minimize the ground
impedance, and keep the parasitic inductance low. The input and
output capacitors should have a good ground connection and be
placed as close to the IC as possible. The feedback trace in the
adjustable version should be away from other noisy traces.
Connect EPAD to the ground plane for better heat dissipation.
Thermal vias on the EPAD increase heat dissipation.
Page 8 of 11
ISL78307
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you have
the latest Rev.
DATE
REVISION
Aug 8, 2019
FN6705.4
Updated links throughout document.
Added Related Literature section.
Updated ordering information table by adding tape and reel versions and updating notes.
Removed About Intersil section.
Updated POD to the latest revision changes are as follows:
-Replace the graphics with standard format (removing the dimension table).
-Updated L Millimeter minimum in detail A from 0.41 to 0.406.
-Updated the following in the Side View:
-Changed total package height Millimeter MIN and MAX values from: 1.43 MIN and 1.68 MAX to:
1.422 MIN and 1.700 MAX and Inches max from 0.066 to 0.067.
-Changed A1 Inches MIN from: 0.001 to 0.0, and A1 Millimeters MIN from 0.03 to 0.0
Updated Disclaimer.
Apr 7, 2015
FN6705.3
“Absolute Maximum Ratings” on page 4,Charged device Model(tested per JESD22-C101C)....2.2kV to
Charged device Model(tested per AEC-Q100-011).....2.2kV
Dec 7, 2013
FN7658.2
Page 9 - 2nd line of the disclaimer changed from:
"Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted"
to:
"Intersil Automotive Qualified products are manufactured, assembled and tested utilizing TS16949
quality systems as noted".
May 13, 2011
FN7658.1
Page 4, Removed the EN Pin Current MAX spec; added TYP spec of 0.026.
FN7658 Rev.4.00
Aug 8, 2019
CHANGE
Page 9 of 11
ISL78307
Package Out Line Drawing
For the most recent package outline drawing, see M8.15B.
M8.15B
8 Lead Narrow Body Small Outline Exposed Pad Plastic Package
Rev 7, 5/19
FN7658 Rev.4.00
Aug 8, 2019
Page 10 of 11
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