CS8101
Micropower 5.0 V, 100 mA
Low Dropout Linear
Regulator with RESET
and ENABLE
The CS8101 is a precision 5.0 V micropower voltage regulator with
very low quiescent current (70
mA
typ at 100
mA
load). The 5.0 V
output is accurate within
±2.0%
and supplies 100 mA of load current
with a typical dropout voltage of only 400 mV. Microprocessor control
logic includes an ENABLE input and an active RESET. This
combination of low quiescent current, outstanding regulator
performance and control logic makes the CS8101 ideal for any battery
operated, microprocessor controlled equipment.
The active RESET circuit includes hysteresis, and operates
correctly at an output voltage as low as 1.0 V. The RESET function is
activated during the power up sequence or during normal operation if
the output voltage drops outside the regulation limits by more than
200 mV typ. The logic level compatible ENABLE input allows the user
to put the regulator into a shutdown mode where it draws only 20
mA
typical of quiescent current.
The regulator is protected against reverse battery, short circuit, over
voltage, and thermal overload conditions. The device can withstand
load dump transients making it suitable for use in automotive
environments.
The CS8101 is functionally equivalent to the National
Semiconductor LP2951 series low current regulators.
Features
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20
1
SO−20 WB
DWF SUFFIX
CASE 751D
8
1
SOIC−8
D SUFFIX
CASE 751
ORDERING INFORMATION
See detailed ordering and shipping information in the package
dimensions section on page 9 of this data sheet.
DEVICE MARKING INFORMATION
See general marking information in the device marking
section on page 9 of this data sheet.
•
•
•
•
•
•
5.0 V
±2.0%
Output
Low 70
mA
Quiescent Current
Active RESET
ENABLE Input for ON/OFF and Active/Sleep Mode Control
100 mA Output Current Capability
Fault Protection
−
+60 V Peak Transient Voltage
−
−15
V Reverse Voltage Short Circuit Thermal Overload
•
Low Reverse Current (Output to Input)
•
Internally Fused Leads Available in SO−20 WB Package
•
These are Pb−Free Devices
©
Semiconductor Components Industries, LLC, 2008
September, 2008
−
Rev. 19
1
Publication Order Number:
CS8101/D
CS8101
PIN CONNECTIONS
ENABLE
NC
NC
GND
GND
GND
GND
NC
NC
RESET
1
SO−20WB
20
V
OUT
V
IN
NC
GND
GND
GND
GND
NC
NC
NC
V
OUT
V
OUT
Sense
ENABLE
GND
1
SOIC−8
8
V
IN
NC
NC
RESET
V
OUT
V
IN
Current Source
(Circuit Bias)
Over Voltage
Shutdown
Internally
connected on
SO−20WB
ENABLE
Current Limit
Sense
+
Thermal
Protection
Error
−
Amplifier
V
OUT
Sense
Bandgap
Reference
RESET
+
−
Reset Com-
parator
GND
Figure 1. Block Diagram
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2
CS8101
MAXIMUM RATINGS*
Rating
Power Dissipation
Peak Transient Voltage (46 V Load Dump @ V
IN
= 14 V)
Operating DC Voltage
ENABLE (Up to V
IN
with external resistor)
Output Current
ESD Susceptibility (Human Body Model)
ESD Susceptibility (Machine Model)
Operating Temperature
Junction Temperature Range
Storage Temperature Range
Lead Temperature Soldering:
Wave Solder (through hole styles only) (Note 1)
Reflow (SMD styles only) (Notes 2 & 3)
Value
Internally Limited
−15,
60
30
10
Internally Limited
2.0
200
−40
to +125
−40
to +150
−55
to +150
260 peak
240 peak
Unit
−
V
V
V
−
kV
V
°C
°C
°C
°C
°C
Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit
values (not normal operating conditions) and are not valid simultaneously. If these limits are exceeded, device functional operation is not implied,
damage may occur and reliability may be affected.
1. 10 second maximum.
2. 60 second maximum above 183°C.
3.
−5°C
/ +0°C allowable conditions.
*The maximum package power dissipation must be observed.
ELECTRICAL CHARACTERISTICS
(6.0 V
≤
V
IN
≤
26 V; I
OUT
= 1.0 mA;
−40
≤
T
A
≤
125,
−40°C
≤
T
J
≤
150°C,
unless otherwise noted.)
Characteristic
Output Stage
Output Voltage, V
OUT
Dropout Voltage (V
IN
−
V
OUT
)
Load Regulation
Line Regulation
Quiescent Current, (I
Q
) Active Mode
9.0 V < V
IN
< 16 V, 100
mA
≤
I
OUT
≤
100 mA
6.0 V < V
IN
< 26 V, 100
mA
≤
I
OUT
≤
100 mA
I
OUT
= 100 mA
I
OUT
= 100
mA
V
IN
= 14 V, 100
mA
≤
I
OUT
≤
100 mA
6.0 < V < 26 V, I
OUT
= 1.0 mA
I
OUT
= 100
mA,
V
IN
= 6.0 V
I
OUT
= 50 mA
I
OUT
= 100 mA
V
OUT
= OFF, V
IN
= 6.0 V, V
ENABLE
= 2.0 V
7.0
≤
V
IN
≤
17 V, I
OUT
= 100 mA, f = 120 Hz
−
V
OUT
= 0 V
−
V
OUT
≤
1.0 V
V
OUT
= 5.0 V, V
IN
= 0 V
4.90
4.85
−
−
−
−
−
−
−
−
60
105
25
150
30
−
5.00
5.00
400
100
5.0
5.0
70
4.0
12
20
75
200
125
180
34
100
5.10
5.15
600
150
50
50
140
6.0
20
50
−
−
−
−
38
200
V
V
mV
mV
mV
mV
mA
mA
mA
mA
dB
mA
mA
°C
V
mA
Test Conditions
Min
Typ
Max
Unit
Quiescent Current, (I
Q
) Sleep Mode
Ripple Rejection
Current Limit
Short Circuit Output Current
Thermal Shutdown
Overvoltage Shutdown
Reverse Current
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CS8101
ELECTRICAL CHARACTERISTICS (continued)
(6.0 V
≤
V
IN
≤
26 V; I
OUT
= 1.0 mA;
−40
≤
T
A
≤
125,
−40°C
≤
T
J
≤
150°C,
Characteristic
ENABLE Input (ENABLE)
Threshold
HIGH
LOW
Input Current
Reset Functions (RESET)
RESET Threshold
HIGH (V
RH
)
LOW (V
RL
)
RESET Hysteresis
Reset Output Leakage
RESET = HIGH
Output Voltage
Low (V
RLO
)
Low (VR
PEAK
)
V
OUT
Increasing
V
OUT
Decreasing
(HIGH
−
LOW)
V
OUT
≥
V
RH
4.525
4.500
25
−
4.75
4.70
50
−
V
OUT
−
0.05
V
OUT
−
0.075
100
25
V
V
mV
mA
(V
OUT
OFF)
(V
OUT
ON)
V
ENABLE
= 2.4 V
−
0.6
−
1.4
1.4
30
2.0
−
100
V
V
mA
Test Conditions
Min
Typ
Max
Unit
unless otherwise noted.)
1.0 V
≤
V
OUT
≤
V
RL,
R
RESET
= 10 k
V
OUT
, Power up, Power down, R
RESET
= 10 k
−
−
0.1
0.6
0.4
1.0
V
V
PACKAGE LEAD DESCRIPTION
PACKAGE LEAD #
SO−20 WB
20
−
1
4, 5, 6, 7
14, 15, 16, 17
10
2, 3, 8, 9, 11,
12, 13, 18
19
SOIC−8
1
2
3
4
5
6,7
8
LEAD SYMBOL
V
OUT
V
OUT
SENSE
ENABLE
GND
RESET
NC
V
IN
5.0 V,
±2.0%,
100 mA output.
Kelvin connection which allows remote sensing of output voltage for improved
regulation. If remote sensing is not required, connect to V
OUT
.
Logic level switches output off when toggled HIGH.
Ground. All GND leads must be connected to Ground.
Active reset (accurate to V
OUT
≥
1.0 V)
No Connection. True no−connect (i.e. is floating)
Input voltage.
FUNCTION
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CS8101
TYPICAL PERFORMANCE CHARACTERISTICS
0.6
0.5
Dropout Voltage
0.4
0.3
0.2
0.1
0
25°C
−40°C
125
°
C
0
10
20
30
40
50
60
70
80
90
100
Load (mA)
Figure 2. CS8101 Dropout Voltage vs. Load Over Temperature
CIRCUIT DESCRIPTION
VOLTAGE REFERENCE AND OUTPUT CIRCUITRY
Output Stage Protection
For 7.0 V < V
IN
< 26 V
The output stage is protected against overvoltage, short
circuit and thermal runaway conditions (Figure 3).
> 30 V
V
IN
V
OUT
V
IN
ENABLE
V
IN(H)
V
RH
V
OUT
V
RL
(1)
VR
PEAK
RESET
VR
LO
(2)
VR
PEAK
I
OUT
Load
Dump
Current
Limit
Short
Circuit
(1) = No Reset Delay Capacitor
(2) = With Reset Delay Capacitor
Figure 4. Circuit Waveform
ENABLE Function
Figure 3. Typical Circuit Waveforms for Output
Stage Protection
If the input voltage rises above 30 V (e.g. load dump), the
output shuts down. This response protects the internal
circuitry and enables the IC to survive unexpected voltage
transients.
Should the junction temperature of the power device
exceed 180°C (typ) the load current capability is reduced
thereby preventing thermal overload. This thermal
management function is an effective means to prevent die
overheating since the load current is the principle heat
source in the IC.
REGULATOR CONTROL FUNCTIONS
The ENABLE function switches the output transistor ON
and OFF. When the voltage on the ENABLE lead exceeds
1.4 V typ, the output pass transistor turns off, leaving a high
impedance facing the load. The IC will remain in Sleep
mode, drawing only 50
mA,
until the voltage on this input
drops below the ENABLE threshold.
RESET Function
The CS8101 contains two microprocessor compatible
control functions: ENABLE and RESET (Figure 4).
A RESET signal (low voltage) is generated as the IC
powers up until V
OUT
is within 250 mV of the regulated
output voltage, or when V
OUT
drops out of regulation, and
is lower than 300 mV below the regulated output voltage. A
hysteresis of 50 mV is included in the function to minimize
oscillations.
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