CS8151
5.0 V, 100 mA Low Dropout
Linear Regulator with
Watchdog, RESET,
and Wake Up
The CS8151 is a precision 5.0 V, 100 mA micro−power voltage
regulator with very low quiescent current (400
mA
typical at 200
mA
load). The 5.0 V output is accurate within
±2%
and supplies 100 mA
of load current with a typical dropout voltage of 400 mV.
Microprocessor control logic includes Watchdog, Wake Up and
RESET. This unique combination of low quiescent current and full
microprocessor control makes the CS8151 ideal for use in battery
operated, microprocessor controlled equipment.
The CS8151 Wake Up function brings the microprocessor out of
Sleep mode. The microprocessor in turn, signals its Wake Up status
back to the CS8151 by issuing a Watchdog signal.
The Watchdog logic function monitors an input signal (WDI) from
the microprocessor. The CS8151 responds to the falling edge of the
Watchdog signal which it expects at least once during each wake−up
period. When the correct Watchdog signal is received, a falling edge is
issued on the wake−up signal line.
RESET is independent of V
IN
and operates correctly to an output
voltage as low as 1.0 V. A RESET signal is issued in any of three
situations. During power up the RESET is held low until the output
voltage is in regulation. During operation if the output voltage shifts
below the regulation limits, the RESET toggles low and remains low
until proper output voltage regulation is restored. And finally, a
RESET signal is issued if the regulator does not receive a Watchdog
signal within the Wake Up period.
The RESET pulse width, Wake Up signal frequency, and Wake Up
delay time are all set by one external capacitor C
Delay
.
The regulator is protected against short circuit, over voltage, and
thermal runaway conditions. The device can withstand 74 V peak
transients, making it suitable for use in automotive environments.
Features
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D
2
PAK−7
DPS SUFFIX
CASE 936AB
1
7
SO−16L
DWF SUFFIX
CASE 751G
16
1
SOIC−14
D SUFFIX
CASE 751A
14
1
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 2 of this data sheet.
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 11 of this data sheet.
•
5.0 V
±
2%/100 mA Output Voltage
•
Micropower Compatible Control Functions
♦
•
•
•
•
•
Wake Up
♦
Watchdog
♦
RESET
Low Dropout Voltage: 400 mV @ 100 mA
Low Sleep Mode Quiescent Current (400
mA
Typ)
Protection Features
♦
Thermal Shutdown
♦
Short Circuit
♦
74 V Peak Transient Capability
♦
Reverse Transient (−50 V)
Internally Fused Leads in SO−14L and SO−16L Packages
These are Pb−Free Devices
1
Publication Order Number:
CS8151/D
©
Semiconductor Components Industries, LLC, 2008
October, 2008
−
Rev. 18
CS8151
MAXIMUM RATINGS*
Rating
Power Dissipation
Output Current (V
OUT
, RESET, Wake Up)
Reverse Battery
Peak Transient Voltage (60 V Load Dump @ V
IN
= 14 V)
Maximum Negative Transient (t < 2.0 ms)
ESD Susceptibility (Human Body Model)
ESD Susceptibility (Machine Model)
Logic Inputs/Outputs
Storage Temperature Range
Lead Temperature Soldering
Wave Solder (through hole styles only) (Note 1)
Reflow (SMD styles only) (Notes 2 & 3)
Value
Internally Limited
Internally Limited
−15
+74
−50
2.0
200
−0.3
to +6.0
−55
to +150
260 peak
240 peak
Unit
−
−
V
V
V
kV
V
V
°C
°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.
1. 10 seconds max
2. 60 seconds max above 183°C
3.
−5°C
/ +0°C allowable conditions
*The maximum package power dissipation must be observed
ELECTRICAL CHARACTERISTICS
(−40°C
≤
T
A
≤
125°C,
−40°C
≤
T
J
≤
150°C, 6.0 V
≤
V
IN
≤
26 V, 100
mA
≤
I
OUT
≤
100 mA,
C
2
= 47
mF
(ESR < 8.0
W),
C
Delay
= 0.1
mF;
unless otherwise specified.)
Characteristic
Output Section
Output Voltage, V
OUT
Dropout Voltage (V
IN
−
V
OUT
)
Load Regulation
Line Regulation
Ripple Rejection
Current Limit
Thermal Shutdown
Overvoltage Shutdown
Quiescent Current
V
OUT
< 1.0 V
I
OUT
= 200
mA
(Sleep)
I
OUT
= 50 mA
I
OUT
= 100 mA (Wake Up)
V
OUT
= 5.0 V, V
IN
= 0 V
9.0 V < V
IN
< 16 V
6.0 V < V
IN
< 26 V, 0 < I
OUT
< 100 mA
I
OUT
= 100 mA
I
OUT
= 100
mA
V
IN
= 14 V, 100
mA
< I
OUT
< 100 mA
I
OUT
= 1.0 mA, 6.0 V < V
IN
< 26 V
7.0 V < V
IN
< 17 V @ f = 120 Hz, I
OUT
= 100 mA
V
OUT
= 4.5 V
−
4.90
4.85
−
−
−
−
60
100
150
50
−
−
−
−
5.0
5.0
400
100
10
10
75
250
180
56
0.4
4.0
12
1.0
5.10
5.15
600
150
50
50
−
−
210
62
0.75
−
20
1.5
V
V
mV
mV
mV
mV
dB
mA
°C
V
mA
mA
mA
mA
Test Conditions
Min
Typ
Max
Unit
Reverse Current
RESET
Threshold High (RTH)
Threshold Low (RTL)
Hysteresis
Output Low
Output High
RTH V
OUT
Increasing
RTL V
OUT
Decreasing
RTH
−
RTL
1.0 V < V
OUT
RTL, I
OUT
= 25
mA
I
OUT
= 25
mA,
V
OUT
> RTH
V
OUT
−
0.3
4.5
150
−
3.8
−
4.7
200
0.2
4.2
V
OUT
−
0.04
4.91
250
0.8
5.1
V
V
mV
V
V
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CS8151
ELECTRICAL CHARACTERISTICS
(−40°C
≤
T
A
≤
125°C,
−40°C
≤
T
J
≤
150°C, 6.0 V
≤
V
IN
≤
26 V, 100
mA
≤
I
OUT
≤
100 mA,
C
2
= 47
mF
(ESR < 8.0
W),
C
Delay
= 0.1
mF;
unless otherwise specified.)
Characteristic
RESET
Current Limit
Delay Time
Watchdog Input
Threshold High
Threshold Low
Hysteresis
Input Current
Pulse Width
0 < WDI < 6.0 V
50% WDI Falling Edge to
50% WDI Rising Edge and
50% WDI Rising Edge to
50% WDI Falling Edge
(see Figures 2, 3, and 4)
−
−
−
−
0.8
25
−10
5.0
1.4
1.3
100
0
−
2.0
−
−
+10
−
V
V
mV
mA
ms
RESET = 0 V, V
OUT
> V
RTH
(Sourcing)
RESET = 5.0 V, V
OUT
> 1.0 V (Sinking)
POR Mode
0.025
0.1
3.0
0.5
12
5.0
1.30
80
7.0
mA
mA
ms
Test Conditions
Min
Typ
Max
Unit
Wake Up Output
Wake Up Period
Wake Up Duty Cycle Nominal
RESET High to
Wake Up Rising Delay Time
Wake Up Response to
Watchdog Input
Wake Up Response to
RESET
Output Low
Output High
Current Limit
See Figure 2
See Figure 4
50% RESET Rising Edge to
50% Wake Up Edge
(see Figures 2, 3, and 4)
50% WDI Falling Edge to
50% Wake Up Falling Edge
50% RESET Falling Edge to
50% Wake Up Falling Edge,
V
OUT
= 5.0 V
→
4.5 V
I
OUT
= 25
mA
(Sinking)
I
OUT
= 25
mA
(Sourcing)
Wake Up = 5.0 V
Wake Up = 0 V
30
40
15
40
50
20
50
60
25
ms
%
ms
−
−
2.0
2.0
10
10
ms
ms
−
3.8
0.025
0.05
0.2
4.2
1.0
−
0.8
5.1
7.0
3.5
V
V
mA
mA
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4
CS8151
PACKAGE PIN DESCRIPTION
Package Pin #
SO−14L
7
8
9
3−5,
10−12
13
14
D
2
PAK
1
2
3
4
5
6
SO−16L
8
9
11
4, 5, 6, 12, 13*
14
15
Pin
Symbol
V
OUT
V
IN
WDI
GND
Wake Up
RESET
Function
Regulated output voltage 5.0 V
±
2%.
Supply voltage to the IC.
CMOS/TTL compatible input lead. The Watchdog function monitors the falling
edge of the incoming signal.
Ground connection.
CMOS/TTL compatible output consisting of a continuously generated signal used
to Wake Up the microprocessor from sleep mode.
CMOS/TTL compatible output lead RESET goes low whenever V
OUT
drops by
more than 6.0% from nominal, or during the absence of a correct watchdog
signal.
Input lead from timing capacitor for RESET and Wake Up signal.
Kelvin connection which allows remote sensing of the output voltage for im-
proved regulation. If remote sensing is not required, connect to V
OUT
.
1
6
7
−
16
7
Delay
Sense
*Pin 6 GND is not directly shorted to the fused paddle GND. The fused paddle GND (pins 4, 5, 12, 13) is connected through the substrate.
Pin 6 must be electrically connected to at least one of the fused paddle GND’s on the PC board.
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Microcontroller MCU
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