1
Features
s
Two Regulated Outputs
Primary Output
8V 5%; 750mA
Secondary Output
5V 2%; 100mA
s
Low Dropout Voltage
s
ON/OFF Control
Option
s
Standby Quiescent Drain
(<2mA)
s
Protection Features
Reverse Battery
60V Peak Transient
Voltage
-50V Reverse Transient
Short Circuit
Thermal Shutdown
Package Options
5 Lead TO-220
Tab (Gnd)
1
CS8164
8V/5V Low Dropout Dual Regulator
with ENABLE
CS8164
Description
V
IN
V
OUT2
Gnd
V
OUT1
ENABLE
Output
Current
Limit
+
-
Output
Current
Limit
Over Voltage
Shutdown
Primary Output
Standby Output
+
-
Thermal
Shutdown
Bandgap
Reference
+
-
Block Diagram
Absolute Maximum Ratings
DC Input Voltage.............................................................................-0.5V to 26V
Transient Peak Voltage (46V Load Dump) .................................................60V
Internal Power Dissipation ..................................................Internally Limited
Operating Temperature Range................................................-40C to +125C
Junction Temperature Range...................................................-40C to +150C
Storage Temperature Range ....................................................-65C to +150C
Reverse Polarity V
OUT1
Input Voltage, DC ................................................-18V
Reverse Polarity Input Voltage, Transient ................................................-50V
Lead Temperature Soldering
Wave Solder (through hole styles only)..........10 sec. max, 260C peak
The CS8164 is a low dropout, dual
8V/5V linear regulator. The secondary
5V/100mA output is used for powering
systems with standby memory.
Quiescent current drain is less than
2mA when supplying 10mA loads from
the standby regulator.
In automotive applications, the CS8164
and all regulated circuits are protected
from reverse battery installations, as
well as high voltage transients. During
line transients, such as a 60V load
dump, the 750mA output will automat-
ically shutdown to protect both internal
circuits and the load, while the sec-
ondary regulator continues to power
any standby load.
The on board ENABLE function con-
trols the regulator's primary output.
When ENABLE is in the low state, the
regulator is placed in STANDBY mode
where it draws 2mA (typ) quiescent
current.
The CS8164 is packaged in a 5-lead
TO-220, with copper tab for connection
to a heat sink, if necessary.
1 V
IN
2 V
OUT1
3 Gnd
4 ENABLE
5 V
OUT2
A Company
Rev. 2/17/98
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
2
CS8164
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
Electrical Characteristics for V
OUT
: V
IN
= 14V, I
OUT
= 500mA, -40C T
J
+150C unless otherwise specified
Package Lead Description
PACKAGE LEAD #
LEAD SYMBOL
FUNCTION
5 Lead TO-220
1
V
IN
Supply voltage, usually direct from battery.
2
V
OUT1
Regulated output 8V, 750mA (typ).
3
Gnd
Ground connection.
4
ENABLE
CMOS compatible input lead; switches V
OUT1
on and off. When
ENABLE is high, V
OUT1
is active.
5
V
OUT2
Standby output 5V, 100mA (typ); always on.
s OUTPUT STAGE (V
OUT1
)
Output Voltage, V
OUT1
13V V
IN
26V, I
OUT1
500mA,
7.6
8.0
8.4
V
13V V
IN
16V, I
OUT1
750mA
7.6
8.0
8.4
V
Dropout Voltage
I
OUT1
= 500mA
0.60
V
Line Regulation
13V V
IN
16V, I
OUT1
= 5mA
15
80
mV
Load Regulation
5mA I
OUT1
500mA
15
80
mV
Quiescent Current
I
OUT1
10mA, No Load on Standby
3
7
mA
I
OUT1
= 500mA, No Load on Standby
40
100
mA
I
OUT1
= 750mA, No Load on Standby
90
mA
Ripple Rejection
f = 120Hz
53
dB
Current Limit
0.75
1.40
2.50
A
Long Term Stability
50
mV/khr
Output Impedance
500mA DC and 10mA rms,
200
m
100Hz - 10kHz
Thermal Shutdown
150
190
C
Overvoltage Shutdown
26
40
V
s Standby Output (V
OUT2
)
Output Voltage, (V
OUT2
)
6V V
IN
26V
4.75
5.00
5.25
V
Dropout Voltage
I
OUT2
100mA
0.55
0.70
V
Line Regulation
6V V
IN
26V
4
50
mV
Load Regulation
1mA I
OUT2
100mA
10
50
mV
Quiescent Current
I
OUT2
10mA, -40C T
J
+125C
2
3
mA
V
OUT1
OFF
Ripple Rejection
f = 120Hz
66
dB
Current Limit
200
mA
Long Term Stability
20
mV/khr
Output Impedance
10mA DC and 1mA rms, 100Hz - 10kHz
1
s ENABLE Function (ENABLE)
Input ENABLE Threshold
V
OUT1
Off
1.25
0.80
V
V
OUT1
On
2.00
1.25
V
Input ENABLE Current
V
ENABLE
V
THRESHOLD
-10
10
A
3
Typical Performance Characteristics
CS8164
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
INPUT
-OUTPUT
DIFFERENTIAL
VOL
T
AGE (V)
OUTPUT CURRENT (mA)
0
200
400
600
800
Dropout Voltage vs. Output Current
7
6
5
4
3
2
1
0
-1
-2
INPUT VOLTAGE (V)
OUTPUT
VOL
T
AGE (V)
8
9
10
11
12
13
-40
-20
0
20
40
60
R
L
=10
W
Output Voltage vs. Input Voltage
7
6
5
4
3
2
1
0
-1
-2
INPUT VOLTAGE (V)
OUTPUT
VOL
T
AGE (V)
-40
-20
0
20
40
60
R
L
= 500
W
Standby Output Voltage vs. Input Voltage
20
10
0
-10
-20
3
2
1
0
TIME (
ms)
INPUT
VOL
T
AGE
CHANGE (V)
OUTPUT
VOL
T
AGE
DEVIA
TION (mV)
I
OUT1
= 500mA
0
10
20
30
40
50
60
Line Transient Response (V
OUT1
)
10
TIME (
ms)
INPUT
VOL
T
AGE
CHANGE (V)
OUTPUT
VOL
T
AGE
DEVIA
TION (mV)
5
0
-5
-10
3
2
1
0
0
10
20
30
40
50
60
Line Transient Response (V
OUT2
)
4
CS8164
Typical Performance Characteristics
OUTPUT CURRENT (mA)
QUIESCENT
CURRENT
(mA)
120
100
80
60
40
20
0
0
200
400
600
800
I
STBY
=10mA
Quiescent Current vs. Output Current
150
TIME (
ms)
ST
ANDBY
LOAD
CURRENT
(mA)
ST
ANDBY
OUTPUT
VOL
T
AGE
DEVIA
TION (mV)
100
50
0
-50
-100
-150
20
15
10
5
0
0
10
20
30
40
50
60
Load Transient Response (V
OUT2
)
AMBIENT TEMPERATURE (
C)
POWER DISSIP
A
TION (W)
20
18
16
14
12
10
8
6
4
2
0
0
10
20
30
40
50
60
70
80
90
INFINITE
HEAT SINK
10
C/W HEAT SINK
NO HEAT SINK
Maximum Power Dissipation (TO-220)
150
TIME (
ms)
LOAD
CURRENT
(A)
OUTPUT
VOL
T
AGE
DEVIA
TION (mV)
100
50
0
-50
-100
-150
0.8
0.6
0.4
0.2
0
0
10
20
30
40
50
60
Load Transient Response (V
OUT1
)
5
The CS8164 is equipped with two outputs. The second
output is intended for use in systems requiring standby
memory circuits. While the high current primary output
can be controlled with the ENABLE lead described below,
the standby output remains on under all conditions as long
as sufficient input voltage is applied to the IC. Thus, mem-
ory and other circuits powered by this output remain unaf-
fected by positive line transients, thermal shutdown, etc.
The standby regulator circuit is designed so that the quies-
cent current to the IC is very low (<2mA) when the other
regulator output is off.
In applications where the standby output is not needed, it
may be disabled by connecting a resistor from the standby
output to the supply voltage. This eliminates the need for
a capacitor on the output to prevent unwanted oscilla-
tions. The value of the resistor depends upon the mini-
mum input voltage expected for a given system. Since the
standby output is shunted with an internal 6.0V Zener, the
current through the external resistor should be sufficient
Standby Output
CS8164
V
IN
ENABLE
V
OUT1
System
Condition
60V
3V
2.4V
8V
0V
Turn
On
Load
Dump
Low V
IN
Line Noise, Etc.
V
OUT2
Short
Circuit
Thermal
Shutdown
Turn
Off
5V
0V
14V
5V
2.0V
0.8V
14V
26V
31V
8V
8V
2.4V
8V
8V
5V
0V
V
OUT2
Typical Circuit Waveform
Dropout Voltage
The input-output voltage differential at which the circuit
ceases to regulate against further reduction in input volt-
age. Measured when the output voltage has dropped
100mV from the nominal value obtained at 14V input,
dropout voltage is dependent upon load current and junc-
tion temperature.
Input Voltage
The DC voltage applied to the input terminals with respect
to ground.
Input Output Differential
The voltage difference between the unregulated input
voltage and the regulated output voltage for which the
regulator will operate.
Line Regulation
The change in output voltage for a change in the input
voltage. The measurement is made under conditions of
low dissipation or by using pulse techniques such that the
average chip temperature is not significantly affected.
Load Regulation
The change in output voltage for a change in load current
at constant chip temperature.
Long Term Stability
Output voltage stability under accelerated life-test condi-
tions after 1000 hours with maximum rated voltage and
junction temperature.
Output Noise Voltage
The rms AC voltage at the output, with constant load and
no input ripple, measured over a specified frequency
range.
Quiescent Current
The part of the positive input current that does not con-
tribute to the positive load current. i.e., the regulator
ground lead current.
Ripple Rejection
The ratio of the peak-to-peak input ripple voltage to the
peak-to-peak output ripple voltage.
Temperature Stability of V
OUT
The percentage change in output voltage for a thermal
variation from room temperature to either temperature
extreme.
Current Limit
Peak current that can be delivered to the output.
Definition of Terms
Circuit Description
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