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CS8371
8V/1A, 5V/250mA Dual Regulator with
Independent Output Enables and NoCapª
Description
Features
The CS8371 is a 8V/5V dual output
linear regulator. The 8V ±5% output
sources 1A, while the 5V ±5% out-
put sources 250mA. Each output is
controlled by its own ENABLE
lead. Setting the ENABLE input
high turns on the associated regula-
tor output. Holding both ENABLE
inputs low puts the IC into sleep
mode where current consumption
is less than 10µA.
The regulator is protected against
overvoltage, short-circuit and ther-
mal runaway conditions. The
device can withstand 45V load
dump transients making suitable
for use in automotive environ-
ments. CherryÕs proprietary
NoCapª solution is the first tech-
nology which allows the output to
be stable without the use of an
external capacitor.
The CS8371 is available in a 7 lead
TO-220 package with copper tab.
The tab can be connected to a
heatsink if necessary.
Block Diagram
s Two Regulated Outputs
8V ±5%, 1A
5V ±5%, 250mA
s Independent ENABLE for
each Output
s Separate Sense Feedback
Lead for 8V Output
s <10µA Sleep Mode Current
s Fault Protection
Overvoltage Shutdown
+45V Peak Transient
Voltage
Short Circuit
Thermal Shutdown
s CMOS Compatible, Low-
Current ENABLE Inputs
VCC
ENABLE1
1.2V
Pre-Regulator/
Bias Generator
Trimmed Bandgap
Voltage Reference
Overvoltage
Shutdown
Current Limit
VIA
VOUT1
Sense
Package Options
TO-220 7 Lead
Tab (Gnd)
ENABLE2
Thermal
Shutdown
1.2V
Gnd
Current Limit
VOUT2
1 ENABLE1
2 ENABLE2
3 VOUT2
1 4 Gnd
5 Sense
6 VCC
7 VOUT1
NoCap is a trademark of Cherry Semiconductor Corporation, and is patented.
Rev. 6/9/99
1
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
A Company
¨

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Absolute Maximum Ratings
Power Dissipation .............................................................................................................................................Internally Limited
ENABLE Input Voltage Range .............................................................................................................................-0.6V to +10.0V
Load Current (8V Regulator)...........................................................................................................................Internally Limited
Load Current (5V Regulator)...........................................................................................................................Internally Limited
Transient Peak Voltage (31V load dump @ 14V VCC) ...........................................................................................................45V
Storage Temperature Range ................................................................................................................................-65¡C to +150¡C
Junction Temperature Range...............................................................................................................................-40¡C to +150¡C
Lead Temperature Soldering: Wave Solder (through hole styles only) ..........................................10 sec. max, 260¡C peak
Electrical Characteristics: -40¡C ² TA ² +85¡C, 10.5V ² VCC ² 16.0V, ENABLE1 = ENABLE2 = 5.0V,
IOUT1 = IOUT2 = 5.0mA, unless otherwise stated.
PARAMETER
s Primary Output (VOUT1)
Output Voltage
Line Regulation
Load Regulation
Sleep Mode Quiescent
Current
Quiescent Current
Dropout Voltage
Dropout Voltage
Quiescent Bias Current
Quiescent Bias Current
Ripple Rejection
Current Limit
Overshoot Voltage
Output Noise
TEST CONDITIONS
IOUT1 = 1.0A
10.5V ² VCC ² 26V
5mA ² IOUT1 ² 1.0A
VCC = 14V, ENABLE1 = ENABLE2 = 0V
VCC = 14V, IOUT1 = 1.0A, IOUT2 = 250mA
IOUT1 = 250mA
IOUT1 = 1.0A
IOUT1 = 5mA, ENABLE2 = 0V, VCC = 14V
IQ = ICC - IOUT1
IOUT1 = 1.0A, ENABLE2 = 0V, VCC = 14V
IQ = ICC - IOUT1
f = 120Hz, VCC = 14V with 1.0VPP AC,
COUT = 0µF
f = 10kHz, VCC = 14V with 1.0VPP AC,
COUT = 0µF
f = 20kHz, VCC = 14V with 1.0VPP AC,
COUT = 0µF
VCC = 16V
5mA ² IREG1 ² 1.0A
10Hz-100kHz
MIN
TYP
7.60 8.00
0 0.2
90
74
68
1.1
300
MAX UNIT
8.40 V
50 mV
150 mV
10.0 µA
30 mA
1.2 V
1.5 V
10 mA
22 mA
dB
dB
dB
2.5 A
6.0 V
µVrms
s Secondary Output (VOUT2)
Output Voltage
Line Regulation
Load Regulation
Dropout Voltage
Dropout Voltage
Quiescent Bias Current
Quiescent Bias Current
Ripple Rejection
IOUT2 = 250mA
7V ² VCC ² 26V
5mA ² IOUT2 ² 250mA
IOUT2 = 5.0mA
IOUT2 = 250mA
IOUT2 = 5mA, ENABLE1 = 0V, VCC = 14V
IQ = ICC - IOUT2
IOUT2 = 250mA, ENABLE1 = 0V, VCC = 14V
IQ = ICC - IOUT2
f = 120Hz, VCC = 14V with 1.0 VPP AC,
COUT = 0µF
f= 10kHz, VCC = 14V with 1.0VPP AC,
COUT = 0µF
f = 20kHz, VCC = 14V with 1.0VPP AC,
COUT = 0µF
4.75
5.00
90
75
67
5.25 V
40 mV
100 mV
2.2 V
2.5 V
7 mA
8 mA
dB
dB
dB
2

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Electrical Characteristics: -40¡C ² TA ² +85¡C, 10.5V ² VCC ² 16.0V, ENABLE1 = ENABLE2 = 5.0V,
IOUT1 = IOUT2 = 5.0mA, unless otherwise stated.
PARAMETER
TEST CONDITIONS
s Secondary Output (VOUT2): continued
Current Limit
VCC = 16V
Overshoot Voltage
5mA ² IREG2 ² 250mA
Output Noise
10Hz-100kHz
MIN
270
TYP
170
MAX
600
4.3
UNIT
mA
V
µVrms
s ENABLE Function (ENABLE)
Input Current
VCC = 14V, 0V ² ENABLE ² 5.5V
Input Voltage
Low
High
-150
0
2.0
150 µA
0.8 V
5.0 V
s Protection Circuitry
ESD Threshold
Overvoltage Shutdown
Thermal Shutdown
Thermal Hysteresis
Human Body Model
Guaranteed by Design
±2.0 ±4.0
24
150 180
30
kV
30 V
¡C
¡C
PACKAGE PIN #
7 Lead TO-220
1
2
3
4
5
6
7
Package Pin Description
PIN SYMBOL
FUNCTION
ENABLE1
ENABLE 2
VOUT2
Gnd
Sense
VCC
VOUT1
ENABLE control for the 8V, 1A output
ENABLE control for the 5V, 250mA output
5V ±5%, 250mA regulated output
Ground
Sense feedback for the primary 8V output
Supply voltage, usually from battery
8V ±5%, 1A regulated output
8.05
8.04
8.03
VIN = 14V
IOUT = 1A
8.02
8.01
8.00
7.99
7.98
7.97
7.96
7.95-40 -20
0 20 40 60 80 100 120 140
Ambient Temperature (°C)
Regulator 1 Output Voltage
Typical Performance Characteristics
5.00 VIN = 14V
IOUT = 250A
4.95
4.90
4.85
-40 -20
0 20 40 60 80 100 120 140
Ambient Temperature (°C)
Regulator 2 Output Voltage
2.0
1.8
1.6
1.4
1.2
-40°C
1.0
25°C
0.8
85°C
0.6
0.4
0.2
0
0 100 200 300 400 500 600 700 800 900 1000
Output Current (mA)
Regulator 1 Dropout Voltage
3

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Typical Performance Characteristics: continued
2.5
2.0
-40°C
1.5
1.0
25°C
85°C
0.5
0
0 50 100 150
Output Current (mA)
Regulator 2 Dropout Voltage
200
10
VIN = 14V
9 TA = 25°C
8
7
6
5
4
3
2
1
250 0 0
12
Reg 1 Output Current (A)
Regulator 1 Current Limit
3
10
VIN = 14V
9 TA = 25°C
8
7
6
5
4
3
2
1
0 0 100 200 300 400
Reg 2 Output Current (mA)
Regulator 2 Current Limit
500
9.0
Enable 1 = 5V
8.5 Enable 2 = 5V
VIN = 14V
8.0 IOUT 1 = 1A
IOUT 2 = 250mA
7.5
7.0
6.5
6.0
5.5
5.0
4.5
4.0-40
-20 0
20 40
Ambient Temperature (°C)
Quiescent Current
60
80
1.0
Enable 1 = 0V
0.9 Enable 2 = 0V
VIN = 14V
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0-40 -20
0
20 40
Ambient Temperature (°C)
Quiescent Current
60
80
6.0
Enable 1 = 5V
Enable 2 = 0V
5.5 VIN = 14V
5.0
4.5
4.0 IOUT = 5mA
IOUT = 1A
3.5
3.0-40
-20 0
20 40
Ambient Temperature (°C)
Regulator 1 Quiescent Current
60
80
4.0
Enable 1 = 0V
3.8 Enable 2 = 5V
VIN = 14V
3.6
3.4
IOUT = 250mA
3.2
IOUT = 5mA
3.0
2.8
2.6
2.4
2.2
2.0-40
-20 0
20 40
Ambient Temperature (°C)
Regulator 2 Quiescent Current
60
80
8.020
8.015
VIN = 14V
8.010
8.005
8.000
7.995
7.990
25°C
-40°C
85°C
7.985
7.980
0
100 200 300 400 500 600 700 800 900 1000
Output Current (mA)
Regulator 1 Load Regulation
5.02
5.01
VIN = 14V
5.00
4.99
25°C
85°C
4.98
4.97
4.96
-40°C
4.95
4.94 0
50 100 150
Output Current (mA)
Regulator 2 Load Regulation
200
250
8 COUT = 0mF
7 TA = 25°C
6 IOUT = 5mA
5
4
3
2
1
0
5
4
3
2
1
0
0 1 2 3 4 5 6 7 8 9 10 11 12
Time (ms)
Regulator 1 Startup
8 COUT = 0mF
7 TA = 25°C
6 IOUT = 5mA
5
4
3
2
1
0
COUT = 0mF
TA = 25°C
2
1
0
-1
-2
5
4
3
2
1
0
0 1 2 3 4 5 6 7 8 9 10 11 12
Time (ms)
Regulator 2 Startup
16
14
12
10
0 100 200 300 400 500
Time (ns)
Regulator 1 Line Transient Response
600
4

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Typical Performance Characteristics: continued
0.6
0.4
0.2
0
-0.2
-0.4
-0.6
COUT = 0mF
TA = 25°C
3
VIN = 14V
COUT = 0mF
2 TA = 25°C
1
0
-1
-2
-3
16
14 1000
12
10 5
0 100 200 300 400 500 600
Time (ns)
0 5 10 15 20 25
Time (ms)
Regulator 2 Line Transient Response
Regulator 1 Load Transient Response
+500
0
-500
VIN = 14V
COUT = 0mF
TA = 25°C
250
5
30 0 5 10 15 20 25
Time (ms)
Regulator 2 Load Transient Response
30
TA = 25°C
VIN = 14V
COUT = 0mF
100
80
60
40
TA = 25°C
VIN = 14V
COUT = 0mF
100
80
60
40
5
TA = 25°C
VIN = 14V
RESR £ 1.6W
IOUT = 5ma to 1A
1
Unstable
Region
201 10 100 1k 10k
Frequency (Hz)
Regulator 1 Ripple Rejection
100k
1M
20
1 10 100 1k 10k
Frequency (Hz)
Regulator 2 Ripple Rejection
100k
1M
0.1 .01
0.1
1
10 100 1000
Output Capacitor Size (mF)
Regulator 1 Stability
Definition of Terms
Dropout Voltage: The input-output voltage differential at
which the circuit ceases to regulate against further
reduction in input voltage. Measured when the output
voltage has dropped 100mV from the nominal value
obtained at 14V input, dropout voltage is dependent
upon load current and junction temperature.
Current Limit: Peak current that can be delivered to the output.
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 tech-
niques 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 accelerat-
ed life-test conditions 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 contribute to the positive load current. 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 VOUT: The percentage change in out-
put voltage for a thermal variation from room temper-
ature to either temperature extreme.
5