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CS8120YDR14 데이터시트 PDF




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부품번호 CS8120YDR14 기능
기능 5V/ 300mA Linear Regulator with and ENABLE RESET
제조업체 Cherry Semiconductor Corporation
로고 Cherry Semiconductor Corporation 로고


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CS8120YDR14 데이터시트, 핀배열, 회로
CS8120
5V, 300mA Linear Regulator with
RESET and ENABLE
Description
Features
The CS8120 is a 5V, 300mA precision
linear regulator with two microproces-
sor compatible control functions and
protection circuitry included on chip.
The composite NPN-PNP output pass
transistor assures a lower dropout volt-
age (1V @ 200mA) without requiring
excessive supply current (2.5mA).
The CS8120Õs two logic control func-
tions make this regulator well suited to
applications requiring microprocessor-
based control at the board or module
level. ENABLE controls the output
stage. A high voltage (>2.9V) on the
ENABLE lead turns off the regula-
torÕs pass transistor and sends the IC
into Sleep mode where it draws only
250µA. The RESET function sends a
RESET signal when the IC is power-
ing up or whenever the output voltage
moves out of regulation. The RESET
signal is valid down to VOUT = 1V.
The CS8120 design optimizes supply
rejection by switching the internal
bandgap reference from the supply
input to the regulator output as soon as
the nominal output voltage is achieved.
Additional on chip filtering enhances
rejection of high frequency transients
on all external leads.
The CS8120 is fault protected against
short circuit, over voltage and thermal
runaway conditions.
Block Diagram *
s 5V ± 4% Output Voltage
300mA
s Low Dropout Voltage
(1V @ 150mA)
s Low Quiescent Current
(2.5mA @ IOUT = 150mA)
s µP Compatible Control
Functions
RESET
ENABLE
s Low Current Sleep Mode
IQ=250µA
s Fault Protection
Thermal Shutdown
Short Circuit
60V Load Dump
Package Options
VIN
ENABLE
RESET
ENABLE
Comparator
Over
Voltage
Shutdown
Bandgap
Supply
VREF
Thermal
Shutdown
TO VOUT
Bandgap
Reference
RESET
Comparator +
-
Output
Current
Limit
- + Error
Amplifier
* TO-220 Block Diagram
VOUT
Gnd
5 Lead TO-220 14 Lead SOIC
Tab (Gnd)
Narrow
VIN 1
NC
NC
VOUT
Gnd
SENSE
NC
ENABLE
NC
RESET
NC NC
NC NC
1 8 Lead PDIP
VOUT 1
VIN
NC
ENABLE
Gnd
SENSE
RESET
NC
5 Lead D2 PAK
1 VIN
2 ENABLE
3 Gnd
4 RESET
5 VOUT
1
Rev. 2/3/98
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Web Site: www.cherry-semi.com
1 A ¨ Company




CS8120YDR14 pdf, 반도체, 판매, 대치품
Typical Performance Characteristics: continued
Quiescent Current vs. Output Current Over Temperature
Output Voltage and Supply Current vs. Input Voltage
3.5
VIN = 14V
3.0
-40°C
2.5
25°C
2.0
125°C
1.5
1.0
0.5
0.0
0
50 100 150 200 250 300 350
Output Current (mA)
5.5
5.0
4.0
3.0
2.0
1.0
0.0
0.0
VOUT
22.0
20.0
16.0
12.0
IQ
8.0
4.0
0.0
2.0 4.0 6.0 8.0 10.0
Supply Voltage (V)
RESET Output Voltage vs. Output Current
2000
1800
1600
1400
1200
1000
800
600
400
200
0
1
VIN = 5V
5 10 15 20 25 30 35 40
Reset Output Current (mA)
Circuit Description
Voltage Reference and Output Circuitry
Precision Voltage Reference
The regulated output voltage depends on the precision
band gap voltage reference in the IC. By adding an error
amplifier into the feedback loop , the output voltage is
maintained within ±4% over temperature and supply
variation.
The NPN pass device prevents deep saturation of the out-
put stage which in turn improves the ICÕs efficiency by
preventing excess current from being used and dissipated
by the IC.
Output Stage Protection
The output stage is protected against overvoltage, short
circuit and thermal runaway conditions (Figure 2).
Output Stage
> 30V
VIN The composite PNP-
NPN output structure
(Figure 1) provides
300mA (typ) of output
current while maintain-
ing a low drop out volt-
age (1.00V, typ) and
drawing little quiescent
current (2.5mA).
VOUT
Figure 1: Composite Output Stage of the CS8120
VIN
VOUT
IOUT
Load
Dump
Short
Circuit
Thermal
Shutdown
Figure 2: Typical Circuit Waveforms for Output Stage Protection.
4

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CS8120YDR14 전자부품, 판매, 대치품
VIN
C1*
0.1mF
Application Notes: continued
VOUT
CS-8120
ENABLE
RESET
RRST
to mP
RESET
Port
CRST
C2**
10mF
5V to mP and
System
Power
*C1 is required if regulator is far from power source filter.
**C2 is required for stability.
Figure 6. Circuit showing output compensation capacitor.
Calculating Power Dissipation
in a Single Output Linear Regulator
The maximum power dissipation for a single output regu-
lator (Figure 7) is:
will keep 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.
PD(max)={VIN(max) Ð VOUT(min)}IOUT(max) + VIN(max)IQ
(1)
where:
VIN(max) is the maximum input voltage,
VOUT(min) is the minimum output voltage,
IOUT(max) is the maximum output current for the applica-
tion, and
IQ is the quiescent current the regulator consumes at
IOUT(max).
Once the value of PD(max) is known, the maximum permis-
sible value of RQJA can be calculated:
RQJA =
150¡C - TA
PD
(2)
The value of RQJA can then be compared with those in
the package section of the data sheet. Those packages
with RQJA's less than the calculated value in equation 2
IIN
VIN
Smart
Regulator
IOUT
VOUT
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:
where:
RQJA = RQJC + RQCS + RQSA
(3)
RQJC = the junctionÐtoÐcase thermal resistance,
RQCS = the caseÐtoÐheatsink thermal resistance, and
RQSA = the heatsinkÐtoÐambient thermal resistance.
RQJC appears in the package section of the data sheet. Like
RQJA, 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.
}Control
Features
IQ
Figure 7. Single output regulator with key performance parameters
labeled.
7

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부품번호상세설명 및 기능제조사
CS8120YDR14

5V/ 300mA Linear Regulator with and ENABLE RESET

Cherry Semiconductor Corporation
Cherry Semiconductor Corporation

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