NCV8518A
Low Dropout Linear
Regulator with Watchdog,
Wake Up, RESET, and
ENABLE
The NCV8518A device is a precision micropower voltage regulator.
It has a fixed output voltage of 5.0 V and regulates within
±2%.
It is
suitable for use in all automotive environments and contains all the
required functions to control a microprocessor. This device has low
dropout voltage and low quiescent current. It includes a watchdog
timer, adjustable reset, wake up and enable function. Also
encompassed in this device are safety features such as thermal
shutdown and short circuit protection. It is capable of handling up to
45 V transients.
Features
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MARKING
DIAGRAMS
8
8
1
SOIC−8
EXPOSED PAD
CASE 751AC
1
16
SOIC−16 LEAD
WIDE BODY
EXPOSED PAD
CASE 751AG
1
1
A
WL
YY, Y
WW
G,
or G
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
NCV8518A
AWLYYWWG
8518A
AYWW
G
•
•
•
•
•
•
•
•
•
•
•
•
Output Voltage of 5.0 V
±2%
Output Voltage Tolerance
Output Current up to 250 mA
Micropower Compatible Control Functions:
−
ENABLE
−
Watchdog
−
RESET
−
Wake Up
NCV Prefix for Automotive and Other Applications Requiring Site
and Change Control
Low Dropout Voltage
Low Quiescent Current of 100
mA
Protection Features:
−
Thermal Shutdown
−
Short Circuit
Low Sleep Mode Current less than 1.0
mA
AEC Qualified
PPAP Capable
These are Pb−Free Devices
16
ORDERING INFORMATION
Device
NCV8518APDG
Package
SOIC−8*
Shipping
†
98 Units / Rail
2500 / Tape & Reel
47 Units / Rail
NCV8518APDR2G SOIC−8*
NCV8518APWG
SOIC−16*
Applications
NCV8518APWR2G SOIC−16* 1000 / Tape & Reel
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
*These packages are inherently Pb−Free.
•
Tire Pressure Monitor
•
Battery Powered Consumer Electronics
©
Semiconductor Components Industries, LLC, 2011
May, 2011
−
Rev. 5
1
Publication Order Number:
NCV8518A/D
NCV8518A
PIN CONNECTIONS
1
SOIC−8 EP
8
SOIC−16 EP
RESET
WDI
ENABLE
V
IN
NC
NC
GND
NC
Delay
NC
NC
V
OUT
1
16
Wake Up
RESET
NC
WDI
NC
ENABLE
NC
V
IN
Wake Up
GND
Delay
V
OUT
PIN FUNCTION DESCRIPTION
Pin
SOIC−8 EP
4
5
7
2
6
SOIC−16 EP
8
9
13
3
11
Symbol
V
OUT
V
IN
WDI
GND
ENABLE
Regulated output voltage.
Input supply voltage.
CMOS compatible Watchdog input. The watchdog function monitors the falling edge of
the incoming signal.
Ground connection.
ENABLE control for the IC. Positive logic. If ENABLE control will not be used, connect
this pin to V
IN
via a 20k current limiting resistor. Internal ESD protection structures will
clamp the maximum ENABLE voltage to approximately 21 V.
CMOS compatible output RESET goes low whenever V
OUT
drops by more than 7.0%
from nominal, or during the absence of a correct watchdog signal.
Buffered reference voltage used to create timing current for RESET and Watchdog
threshold frequency from R
Delay.
No Connection.
Continuously generated signal that interrupts the microprocessor from sleep mode.
Connect to Ground potential or leave unconnected.
Description
8
3
−
1
EPAD
15
5
1, 2, 4, 6, 7,
10, 12, 14
16
EPAD
RESET
Delay
NC
Wake Up
EPAD
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2
NCV8518A
V
IN
V
OUT
Ilimit
OSCH
ENABLE
Enable
TSD
FB
Rail
OSCL
+ -
Reference
VBG
+ -
UVLO
Watchdog +
Wakeup
Logic
Iref
OSCH OSCL
WDI
Buffer
Reset
Driver
RESET
Delay
+
-
Timing
Circuit
Wakeup
Driver
Wake Up
Figure 1. Block Diagram
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3
NCV8518A
MAXIMUM RATINGS
Rating
Input Voltage
ENABLE Voltage
(ENABLE may be connected to V
IN
through an external 20k resistor without damage)
Output Voltage
RESET Voltage
RESET Current
(RESET may be incidentally shorted either to V
OUT
or to GND without damage)
ESD Susceptibility (Human Body Model)
Logic Inputs/Outputs (Reset, WDI, Wake Up, Delay)
Operating Junction Temperature
Storage Temperature Range
Moisture Sensitivity Level
SOIC−16 EP (Case 751R)
SOIC−8 EP (Case 751AC)
Lead Temperature Soldering: Reflow
Leaded Part
60−150 sec above 183°C, 30 sec max at peak
Lead−Free Part
60−150 sec above 217°C, 40 sec max at peak
Symbol
V
IN
V
ENABLE
V
OUT
V
RESET
I
RESET
−
−
T
J
T
S
MSL
Value
−0.3
to 45
−0.3
to 16
−0.3
to +7.0
0 V to V
OUT
Internally
Limited
2.0
−0.3
to +7.0
−40
to150
−55
to +150
1
2
240 peak
265 peak
°C
°C
Unit
V
V
V
V
mA
kV
V
°C
°C
−
−
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
THERMAL CHARACTERISTICS
Parameter
SO−8 Exposed Pad Package
100 sq. mm spreader board (Note 1)
Junction to case top (Y
JT
)
Junction to lead1 (Y
JL1
)
Junction to board (Y
JB
) (Note 3)
Junction to ambient (q
JA
)
SO−16 Exposed Pad Package
100 sq. mm spreader board (Note 1)
Junction to case top (Y
JT
)
Junction to lead1 (Y
JL1
)
Junction to board (Y
JB
) (Note 3)
Junction to ambient (q
JA
)
20
41
12
113
1 sq. inch spreader board (Note 2)
20
26
12
70
°C/W
°C/W
°C/W
°C/W
14
36
15
126
1 sq. inch spreader board (Note 2)
14
26
14
80
°C/W
°C/W
°C/W
°C/W
Board/Mounting Conditions Typical Value
Unit
Specific notes on thermal characterization conditions:
All boards are 0.062” thick FR4, 3” square, with varying amounts of copper heat spreader, in still air (free convection) conditions. Numerical
values are derived from an axisymmetric finite−element model where active die area, total die area, flag area, pad area, and board area are
equated to the actual corresponding areas.
1. 1 oz copper, 100 mm
2
(0.155 in
2
) spreader area (includes exposed pad).
2. 1 oz copper, 645 mm
2
(1 in
2
) spreader area (includes exposed pad).
3. “board” is defined as center of exposed pad soldered to board; this is the recommended number to be used for thermal calculations, as it
best represents the primary heat flow path and is least sensitive to board and ambient properties.
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4
NCV8518A
ELECTRICAL CHARACTERISTICS
(−40°C
≤
T
J
≤
150°C; 6.0 V
≤
V
IN
≤
28 V, 100
mA
≤
I
OUT
≤
150 mA, C
2
= 1.0
mF,
R
Delay
= 60 k;
unless otherwise specified.)
Characteristic
Output
Output Voltage
Dropout Voltage (V
IN
−
V
OUT
, I
OUT
= 150 mA) (Note 4)
Load Regulation
(V
IN
= 13.5 V, 100
mA
≤
I
OUT
≤
150 mA)
Line Regulation
(6.0 V
≤
V
IN
≤
28 V, I
OUT
= 5.0 mA)
Current Limit
Thermal Shutdown (Guaranteed by Design)
Quiescent Current
(V
IN
= 13.5 V, I
OUT
= 100
mA,
150 mA, ENABLE = 2.0 V)
(ENABLE = 0 V, T
A
= +125°C)
RESET
Threshold Voltage
Output Low
(R
LOAD
= 10 k to V
OUT
, V
OUT
= 1.0 V)
Output High (R
LOAD
= 10 k to GND)
Power On Reset Delay Time
(V
IN
= 13.5 V, R
Delay
= 60 k, I
OUT
= 5.0 mA)
(V
IN
= 13.5 V, R
Delay
= 120 k, I
OUT
= 5.0 mA)
V
IN
= 13.5 V, R
Delay
= 500 k, I
OUT
= 5.0 mA)
Reset Reaction Time
Input and ENABLE Transient Rejection (Note 6)
Watchdog Input
Threshold
Hysteresis
Input Current (WDI = 6.0 V)
Wake Up Rising Edge to WDI Falling Edge Delay
Wake Up
WDI
ENABLE
(Note 5)
Input Threshold
Logic Low
Logic High
Input Current (ENABLE = 2.0 V)
V
th(EN)
V
−
2.0
−
−
−
3.0
0.8
−
10
mA
WDI
high
WDI
hys
−
−
30
25
−
5.0
50
100
0.1
−
70
−
2.0
−
%V
OUT
mV
mA
ms
−
−
−
t
D
4.50
−
V
OUT
−
0.4
2.0
−
−
−
1.0
4.65
0.2
V
OUT
−
0.2
3.0
6.0
25
20
−
4.75
0.4
−
4.0
−
−
−
−
ms
V/ms
V
V
V
ms
V
OUT
V
DO
Reg
load
Reg
line
I
lim
T
Jmax
I
Q
4.9
−2%
−
−
−
255
150
−
−
5.00
425
5.0
5.0
400
180
100
−
5.10
+2%
750
30
20
−
210
150
1.0
V
mV
mV
mV
mA
°C
mA
Symbol
Min
Typ
Max
Unit
Trr
dV/dt
−
4. Measured when the output voltage has dropped 2% from the nominal value.
5. If ENABLE is connected to V
IN
, a 20 kW resistor must be placed in series.
6. Slew rates in excess of this limit may cause RESET to change state.
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5
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