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CS8361YDWF16 데이터시트 PDF




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부품번호 CS8361YDWF16 기능
기능 5V Dual Micropower Low Dropout Regulator with ENABLE and RESET
제조업체 Cherry Semiconductor Corporation
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CS8361YDWF16 데이터시트, 핀배열, 회로
CS8361
5V Dual Micropower Low Dropout
Regulator with ENABLE and RESET
Description
Features
The CS8361 is a precision micro-
power dual voltage regulator with
ENABLE and RESET.
The 5V standby output is accurate
within ±2% while supplying loads
of 100mA and has a typical
dropout voltage of 400mV.
Quiescent current is low, typically
140µA with a 300µA load. The
active RESET output monitors the
5V standby output and holds
the RESET line low during power-
up and regulator dropout condi-
tions. The RESET circuit includes
hysteresis and is guaranteed to
operate correctly with 1V on the
standby output.
The second output tracks the 5V
standby output through an external
adjust lead, and can supply loads
of 250mA with a typical dropout
voltage of 400mV. The logic level
ENABLE lead is used to control
this tracking regulator output.
Both outputs are protected against
overvoltage, short circuit, reverse
battery and overtemperature condi-
tions. The robustness and low qui-
escent current of the CS8361 makes
it not only well suited for automo-
tive microprocessor applications,
but for any battery powered micro-
processor applications.
Block Diagram
s 2 Regulated Outputs
Standby Output 5V
±2%; 100mA
Tracking Output 5V;
250mA
s Low Dropout Voltage
(0.4V at rated current)
s RESET Option
s ENABLE Option
s Low Quiescent Current
s Protection Features
Independent Thermal
Shutdown
Short Circuit
60V Load Dump
Reverse Battery
VIN
ENABLE
Gnd
Overvoltage
Shutdown
OVSD
Current
Limit
+
Bandgap
BG BG
VSTBY
5V,100mA,2%
RESET
VIN
Thermal
Shutdown
TSD
+
TSD OVSD
Current
Limit
+
VSTANDBY
BG
RESET
TSD OVSD
+
VTRK
250mA
Adj
RESET
* Consult factory for positive ENABLE option.
Rev. 5/4/99
1
Package Options
16 Lead PDIP & SOIC Wide
(internally fused leads)
VIN 1
NC
VTRK
Gnd
Gnd
Adj
NC
ENABLE
VSTBY
NC
NC
Gnd
Gnd
NC
NC
RESET
7L TO-220
7L D2PAK
1. VSTBY
2. VIN
3. VTRK
4. Gnd
1
5. Adj
6. ENABLE
7. RESET
1
Also available in 20 Lead SOIC Wide.
Consult factory for 20 Lead PSOP .
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
A Company
®




CS8361YDWF16 pdf, 반도체, 판매, 대치품
Circuit Description
ENABLE Function
The ENABLE function switches the output transistor for
VTRK on and off. When the ENABLE lead voltage exceeds
1.4V(typ), VTRK turns off. This input has several hundred
millivolts of hysteresis to prevent spurious output activity
during power-up or power-down.
RESET Function
The RESET is an open collector NPN transistor, con-
trolled by a low voltage detection circuit sensing the VSTBY
(5V) output voltage. This circuit guarantees the RESET
output stays below 1V (0.1V typ) when VSTBY is as low as
1V to ensure reliable operation of microprocessor-based
systems.
VTRK Output Voltage
This output uses the same type of output device as VSTBY,
but is rated for 250mA. The output is configured as a
tracking regulator of the standby output. By using the
standby output as a voltage reference, giving the user an
external programming lead (Adj lead), output voltages
from 5V to 20V are easily realized. The programming is
done with a simple resistor divider (Figure 2), and follow-
ing the formula:
VTRK = VSTBY ´ (1 + R1/R2) + IAdj ´ R1
If another 5V output is needed, simply connect the Adj
lead to the VTRK output lead.
Application Notes
External Capacitors
Output capacitors for the CS8361 are required for stability.
Without them, the regulator outputs will oscillate. Actual
size and type may vary depending upon the application
load and temperature range. Capacitor effective series
resistance (ESR) is also a factor in the IC stability. Worst-
case is determined at the minimum ambient temperature
and maximum load expected.
Output capacitors can be increased in size to any desired
value above the minimum. One possible purpose of this
would be to maintain the output voltages during brief
conditions of negative input transients that might be char-
acteristic of a particular system.
Capacitors must also be rated at all ambient temperatures
expected in the system. To maintain regulator stability
down to -40ûC, capacitors rated at that temperature must
be used.
More information on capacitor selection for Smart
Regulatorsª is available in the Smart Regulator applica-
tion note, ÒCompensation for Linear Regulators.Ó
Calculating Power Dissipation
in a Dual Output Linear Regulator
The maximum power dissipation for a dual output regula-
tor (Figure 1) is:
PD(max) = {VIN(max)ÐVOUT1(min)}IOUT1(max)+
{VIN(max)ÐVOUT2(min)}IOUT2(max)+VIN(max)IQ
(1)
Where
VIN(max) is the maximum input voltage,
VOUT1(min) is the minimum output voltage from VOUT1,
VOUT2(min) is the minimum output voltage from VOUT2,
IOUT1(max) is the maximum output current, for the
application
IOUT2(max) is the maximum output current, for the
application
IQ is the quiescent current the regulator consumes at
IOUT(max).
Once the value of PD(max) is known, the maximum per-
missible 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
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
heat sink will be required.
IIN
VIN
Smart
Regulator
}Control
Features
IQ
IOUT1
IOUT2
VOUT1
VOUT2
Figure 1: Dual output regulator with key performance parameters
labeled.
4

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부품번호상세설명 및 기능제조사
CS8361YDWF16

5V Dual Micropower Low Dropout Regulator with ENABLE and RESET

Cherry Semiconductor Corporation
Cherry Semiconductor Corporation

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