CS8147 [CHERRY]
10V/5V Low Dropout Dual Regulator with ENABLE; 10V / 5V低压降稳压器双带使能
| 型号： | CS8147 |
| 厂家： | 
CHERRY SEMICONDUCTOR CORPORATION |
| 描述： | 10V/5V Low Dropout Dual Regulator with ENABLE |
| 文件： | 总8页 (文件大小：177K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CS8147
10V/5V Low Dropout Dual Regulator
ENABLE
with
Description
Features
The CS8147 is a 10V/5V dual out-
put linear regulator. The 10V ±.5%
output sources 500mA and the 5V
±3% output sources 70mA. The
secondary output is inherently sta-
ble and does not require an external
capacitor.
regulator draws only 70µA of qui-
escent current.
■ Two Regulated Outputs
10V ± 5%; 500 mA
5V ± 3%; 70 mA
The regulator is protected against
overvoltage conditions. Both out-
puts are protected against short
circuit and thermal runaway
conditions.
■ 70µA SLEEP Mode Current
■ Inherently Stable
Secondary Output
(No Output Capacitor
Required)
ENABLE
The on board
controls the regulatorÕs two out-
ENABLE
function
The CS8147 is packaged in a 5 lead
TO-220 with copper tab. The cop-
per tab can be connected to a heat
sink if necessary.
puts. When
is high, the
regulator is placed in SLEEP mode.
Both outputs are disabled and the
■ Fault Protection
Overvoltage Shutdown
Reverse Battery
60V Peak Transient
-50V Reverse Transient
Short Circuit
Absolute Maximum Ratings
Input Voltage (VIN)
DC .............................................................................................-18V to 26V
Positive Peak Transient Voltage
(46V Load Dump @ VIN = 14V) .......................................................60V
Thermal Shutdown
Negative Peak Transient Voltage ......................................................-50V
ESD (Human Body Model) ...........................................................................2kV
■ CMOS Compatible
Input with Low
ENABLE
ENABLE
Input...................................................................................-0.3 to 10V
(IOUT(max)) Input Current.
Internal Power Dissipation..................................................Internally Limited
Junction Temperature Range...................................................-40¡C to +150¡C
Storage Temperature Range ....................................................-65¡C to +150¡C
Lead Temperature Soldering
Package Options
Wave Solder (through hole styles only)..........10 sec. max, 260¡C peak
5 Lead TO-220
Block Diagram
Tab (Gnd)
Primary Output
VOUT1
VIN
Over Voltage
Shutdown
Anti-saturation
and
Current Limit
+
-
-
ENABLE
Pre-Regulator
+
Secondary Output
ENABLE
2 VIN
3 Gnd
4 VOUT1 (10V)
5 VOUT2 (5V)
1
Bandgap
-
Reference
1
+
VOUT2
Gnd
Thermal
Shutdown
Current Limit
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
Rev. 4/5/99
A
¨
Company
1
Electrical Characteristics for VOUT: VIN = 14V, IOUT1 = IOUT2 = 5mA, -40¡C < TJ < 150¡C, -40¡C ² TA ² 125ûC,
= LOW; unless otherwise specified.
ENABLE
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
■ Primary Output (VOUT1
)
Output Voltage
13V ² VIN ² 26V, IOUT1 ² 500mA,
IOUT1 = 500mA
9.50
10.00
0.5
45
10.50
0.7
90
V
V
Dropout Voltage
Line Regulation
11V ² VIN ² 18V, IOUT1 = 250mA
5mA ² IOUT1 ² 500mA
mV
mV
Load Regulation
Quiescent Current
15
75
IOUT1 ² 1mA, No Load on VOUT2, VIN = 18V
IOUT1 = 500mA, No Load on VOUT2, VIN = 11V
3
60
7
120
mA
mA
ENABLE
= HIGH
VOUT1,VOUT2 = OFF
Quiescent Current
70
200
µA
Current Limit
0.55
32
0.80
50
A
mV/khr
V
Long Term Stability
Over Voltage Shutdown
VOUT1 and VOUT2
36
40
■ Secondary Output (VOUT2
)
Output Voltage
6V ² VIN ² 26V, 1mA ² IOUT2 ² 70mA
IOUT2 ² 70mA
4.85
5.00
1.5
4
5.15
2.5
50
V
Dropout Voltage
Line Regulation
Load Regulation
Current Limit
V
11 ² VIN ² 18V, IOUT = 70µA
1mA ² IOUT2 ² 70mA, VIN = 14V
mV
mV
mA
10
50
150
ENABLE
ENABLE
Threshold
■
Function (
ENABLE
)
Input
VOUT2(ON)
VOUT1(OFF)
1.40
1.40
2.50
10
V
V
.8
ENABLE
Input
Current
Input Voltage Range 0 to 5V
-10
µA
Package Lead Description
LEAD SYMBOL
PACKAGE LEAD #
FUNCTION
5 Lead TO-220
ENABLE
1
CMOS compatible input lead; switches VOUT1 and VOUT2 on
ENABLE
and off. When
is low, VOUT1 and VOUT2 are active.
2
3
4
5
VIN
Supply voltage, usually direct from battery.
Ground connection.
Gnd
VOUT1
VOUT2
Regulated output 10V, 500mA (typ)
Secondary output 5V, 70mA (typ).
2
Typical Performance Characteristics
Dropout Voltage vs. Output Current (VOUT1
Dropout Voltage vs. Output Current (VOUT2
)
)
600
550
500
450
400
2.00
-40°C
1.80
1.60
25°C
1.40
1.20
125°C
350
300
250
200
150
100
50
125°C
25°C
1.00
0.80
-40°C
0.60
0.40
V
IN
= 6.00V
0.20
0
0
10 20 30 40 50 60 70 80 90 100
Output Current (mA) V (5V)
0
0
50 100 150 200 250 300 350 400 450 500 550 600
Output Current (mA)
OUT2
Quiescent Current vs. Output Current (VOUT1
)
Quiescent Current vs. Output Current (VOUT2)
100
7
6
5
4
3
90
80
70
25°C
125°C
-40°C
25°C
60
50
-40°C
V
= 14V
IN
40
30
125°C
2
1
0
20
V
= 14V
IN
10
0
0
10
20
30
40
50
60
70
80
90
100
0
50 100 150 200 250 300 350 400 450 500 550 600
Output Current (mA)
Output Current (mA), V
(5V)
OUT2
VOUT2 vs. Temperature
Line Regulation vs. Output Current (VOUT1
)
120
110
100
90
5.02
5.01
5.00
4.99
4.98
125°C
25°C
V
IN
= 11V - 26V
80
-40°C
70
60
50
40
30
20
10
0
-50 -40 -30 -20 -10
0
10 20 30 40 50 60 70 80 90 100 110 120 130 140
Temp (C°)
0
50 100 150 200 250 300 350 400 450 500 550 600
Output Current (mA), V (10V)
PART1 V =14V, RLOAD=0
IN
OUT
1
3
Typical Performance Characteristics
Load Regulation vs. Output Current (VOUT1
)
Load Regulation vs. Output Current (VOUT2
)
10
9
30
26
V
IN
= 14V
22
8
7
6
V
= 14V
125°C
IN
18
14
25°C
25°C
-40°C
5
4
10
6
-40°C
3
2
2
-2
-6
125°C
1
0
-10
0
10 20 30 40 50 60 70 80 90 100
Output Current (mA), V (5V)
0
50 100 150 200 250 300 350 400 450 500 550 600
Output Current (mA), V (10V)
OUT
2
OUT
1
Quiescent Current (ICQ) vs. VIN over Temperature
350
ENABLE Input Current vs. Input Voltage
-40ûC
V10 = 500mA Load
V5 = 70mA Load
100.0
300
25ûC
250
200
20.00
/div
0
150
100
125ûC
50
0
-100.0
0
1
2
3
4
5
6
7
8
9 10 11 12 13 14 15
0
-1.000
9.000
VIN (V)
V
1.000/div (V)
ENABLE
VOUT1 vs. Temperature
Quiescent Current (ICQ) vs. VIN over RLOAD
300
250
200
150
100
10.025
10.020
10.015
10.010
VOUT1 = 500mA Load
VOUT2 = 100mA Load
V
O
= 14V
IN
= 30mA
I
10.005
10.000
9.995
9.990
9.985
9.980
9.975
V10 = 500mA Load
V5 = No Load
50
0
VOUT1= No Load
VOUT2 = No Load
0 1
2
3 4 5 6
7 8 9 10 11 12 13 14 15
-50 -30 -10 10 30 50 70 90 110 130 150
VIN (V)
TEMP (°C)
4
Definition of Terms
Dropout Voltage: The input-output voltage differential at which
Load Regulation: The change in output voltage for a change in
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.
load current at constant chip temperature.
Long Term Stability: Output voltage stability under accelerated
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.
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.
Quiescent Current: The part of the positive input current that
does not contribute to the positive load current. The
regulator ground lead current.
Input Output Differential: The voltage difference between the
unregulated input voltage and the regulated output
voltage for which the regulator will operate.
Ripple Rejection: The ratio of the peak-to-peak input ripple
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.
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 tempera-
ture to either temperature extreme.
Typical Circuit Waveform
60V
26V
14V
31V
VIN
14V
5V
2.0V
0.8V
ENABLE
10V
5V
10V
5V
10V
10V
5V
10V
5V
5V
0V
0V
0V
0V
0V
VOUT1
0V
0V
5V
VOUT2
3V
0V
System
Condition
Turn
On
Load
Dump
Line Noise, Etc.
VOUT
Short
Thermal
Shutdown
Turn
Off
Low VIN
Circuit
Test & Applications Circuit
C *
1
DISPLAY
0.1 mF
V
IN
10V
V
OUT1
C **
2
10mF
CS8147
Control
ENABLE
5V
V
OUT2
Tuner IC
Gnd
* C1 is required if the regulator is located away from the power source filter.
**C2 is required for stability.
5
Applications
Step 5: If the capacitor is adequate, repeat steps 3 and 4
ENABLE
Since both outputs are controlled by the same
,
with the next smaller valued capacitor. A smaller capacitor
will usually cost less and occupy less board space. If the
output oscillates within the range of expected operating
conditions, repeat steps 3 and 4 with the next larger stan-
dard capacitor value.
the CS8147 is ideal for applications where a sleep mode is
required. Using the CS8147, a section of circuitry such as a
display and nonessential 5V circuits can be shut down
under microprocessor control to conserve energy.
The test applications circuit diagram shows an automotive
radio application where the display is powered by 10V
from VOUT1 and the Tuner IC is powered by 5V from
VOUT2. Neither output is required unless both the ignition
and the Radio On/OFF switch are on.
Step 6: Test the load transient response by switching in
various loads at several frequencies to simulate its real
working environment. Vary the ESR to reduce ringing.
Step 7: Raise the temperature to the highest specified oper-
ating temperature. Vary the load current as instructed in
step 5 to test for any oscillations.
Stability Considerations
Once the minimum capacitor value with the maximum
ESR is found for each output, a safety factor should be
added to allow for the tolerance of the capacitor and any
variations in regulator performance. Most good quality
aluminum electrolytic capacitors have a tolerance of ±20%
so the minimum value found should be increased by at
least 50% to allow for this tolerance plus the variation
which will occur at low temperatures. The ESR of the
capacitors should be less than 50% of the maximum allow-
able ESR found in step 3 above.
The secondary output VOUT2 is inherently stable and does
not require a compensation capacitor. However a compen-
sation capacitor connected between VOUT1 and ground is
required for stability in most applications.
The output or compensation capacitor helps determine
three main characteristics of a linear regulator: start-up
delay, load transient response and loop stability.
The capacitor value and type should be based on cost,
availability, size and temperature constraints. A tantalum
or aluminum electrolytic capacitor is best, since a film or
ceramic capacitor with almost zero ESR can cause instabili-
ty. The aluminum electrolytic capacitor is the least expen-
sive solution, but, if the circuit operates at low tempera-
tures (-25¡C to -40¡C), both the value and ESR of the capac-
itor will vary considerably. The capacitor manufacturers
data sheet usually provides this information.
Calculating Power Dissipation
in a Dual Output Linear Regulator
The maximum power dissipation for a dual output regula-
tor (Figure 1) is
The value for the output capacitor C2 shown in the test
and applications circuit should work for most applications,
however it is not necessarily the optimized solution.
PD(max) = {VIN(max) Ð VOUT1(min)}IOUT1(max)
+
{VIN(max) Ð VOUT2(min)}IOUT2(max) + VIN(max)IQ
(1)
To determine acceptable value for C2 for a particular
application, start with a tantalum capacitor of the recom-
mended value and work towards a less expensive alterna-
tive part.
Where:
VIN(max) is the maximum input voltage,
VOUT1(min) is the minimum output voltage from VOUT1
,
Step 1: Place the completed circuit with a tantalum capaci-
tor of the recommended value in an environmental cham-
ber at the lowest specified operating temperature and
monitor the outputs with an oscilloscope. A decade box
connected in series with the capacitor will simulate the
higher ESR of an aluminum capacitor. Leave the decade
box outside the chamber, the small resistance added by the
longer leads is negligible.
V
OUT2(min) is the minimum output voltage from VOUT2
,
IOUT1(max) is the maximum output current, for the appli-
cation,
IOUT2(max) is the maximum output current, for the appli-
cation, and
IQ is the quiescent current the regulator consumes at
IOUT(max)
.
Step 2: With the input voltage at its maximum value,
increase the load current slowly from zero to full load
while observing the output for any oscillations. If no oscil-
lations are observed, the capacitor is large enough to
ensure a stable design under steady state conditions.
Once the value of PD(max) is known, the maximum permissi-
ble value of RQJA can be calculated:
Step 3: Increase the ESR of the capacitor from zero using
the decade box and vary the load current until oscillations
appear. Record the values of load current and ESR that
cause the greatest oscillation. This represents the worst
case load conditions for the regulator at low temperature.
150¡C - TA
RQJA
=
(2)
PD
The value of RQJA can then be compared with those in
the package section of the data sheet. Those packages with
R
QJA's less than the calculated value in equation 2 will keep
Step 4: Maintain the worst case load conditions set in step
3 and vary the input voltage until the oscillations increase.
This point represents the worst case input voltage condi-
tions.
the die temperature below 150¡C.
In some cases, none of the packages will be sufficient to
dissipate the heat generated by the IC, and an external
heatsink will be required.
6
Application Notes: continued
I
IN
I
I
OUT
1
V
IN
Smart
Regulator
V
V
OUT
1
2
OUT
2
OUT
Control
Features
}
I
Q
Figure 1: Dual output regulator with key performance parameters
labeled.
Heat Sinks
A heat sink effectively increases the surface area of the
package to improve the flow of heat away from the IC and
into the surrounding air.
Each material in the heat flow path between the IC and the
outside environment will have a thermal resistance. Like
series electrical resistances, these resistances are summed
to determine the value of RQJA
:
RQJA = RQJC + RQCS + RQSA
(3)
where:
R
QJC = the junctionÐtoÐcase thermal resistance,
R
QCS = the caseÐtoÐheatsink thermal resistance, and
R
QSA = the heatsinkÐtoÐambient thermal resistance.
R
R
QJC appears in the package section of the data sheet. Like
QJA, it too is a function of package type. RQCS and RQSA
are functions of the package type, heatsink and the inter-
face between them. These values appear in heat sink data
sheets of heat sink manufacturers.
7
Package Specification
PACKAGE DIMENSIONS IN MM (INCHES)
PACKAGE THERMAL DATA
5 Lead TO-220
Thermal Data
5 Lead TO-220 (T) Straight
RQ
RQ
typ
typ
2.4
50
ûC/W
ûC/W
JC
JA
5 Lead TO-220 (TVA) Vertical
1.40 (.055)
1.14 (.045)
4.83 (.190)
4.83 (.190)
4.06 (.160)
10.54 (.415)
4.06 (.160)
9.78 (.385)
3.96 (.156)
2.87 (.113)
2.62 (.103)
3.71 (.146)
3.96 (.156)
3.71 (.146)
10.54 (.415)
9.78 (.385)
6.55 (.258)
5.94 (.234)
1.40 (.055)
1.14 (.045)
14.99 (.590)
14.22 (.560)
6.55 (.258)
5.94 (.234)
2.87 (.113)
2.62 (.103)
14.99 (.590)
14.22 (.560)
14.22 (.560)
13.72 (.540)
1.78 (.070)
2.92 (.115)
2.29 (.090)
8.64 (.340)
7.87 (.310)
1.02 (.040)
0.76 (.030)
4.34 (.171)
7.51 (.296)
0.56 (.022)
0.36 (.014)
1.68
(.066) typ
0.56 (.022)
0.36 (.014)
1.70 (.067)
1.83(.072)
1.57(.062)
1.02(.040)
0.63(.025)
6.80 (.268)
6.93(.273)
6.68(.263)
2.92 (.115)
2.29 (.090)
.94 (.037)
.69 (.027)
5 Lead TO-220 (THA) Horizontal
4.83 (.190)
4.06 (.160)
10.54 (.415)
9.78 (.385)
1.40 (.055)
1.14 (.045)
3.96 (.156)
3.71 (.146)
2.87 (.113)
2.62 (.103)
14.99 (.590)
14.22 (.560)
6.55 (.258)
5.94 (.234)
2.77 (.109)
6.83 (.269)
1.68
2.92 (.115)
2.29 (.090)
0.56 (.022)
(.066)
TYP
0.81(.032)
0.36 (.014)
6.60 (.260)
5.84 (.230)
1.70 (.067)
6.81(.268)
Ordering Information
Description
Part Number
CS8147YT5
CS8147YTVA5
CS8147YTHA5
Ch erry Sem icon du ctor Corporation reserves th e
righ t to m ake ch an ges to th e specification s with ou t
n otice. Please con tact Ch erry Sem icon du ctor
Corporation for th e latest available in form ation .
5 Lead TO-220 Straight
5 Lead TO-220 Vertical
5 Lead TO-220 Horizontal
Rev. 4/5/99
© 1999 Cherry Semiconductor Corporation
8
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