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CS8140YTVA7 데이터시트 PDF




Cherry Semiconductor Corporation에서 제조한 전자 부품 CS8140YTVA7은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 CS8140YTVA7 자료 제공

부품번호 CS8140YTVA7 기능
기능 5V/ 500mA Linear Regulator with ENABLE/ / and Watchdog RESET
제조업체 Cherry Semiconductor Corporation
로고 Cherry Semiconductor Corporation 로고


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CS8140YTVA7 데이터시트, 핀배열, 회로
CS8140/1
5V, 500mA Linear Regulator with
ENABLE, RESET, and Watchdog
Description
The CS8140 is a 5V Watchdog
Regulator with protection circuitry and
three logic control functions that allow
a microprocessor to control its own
power supply. The CS8140 is designed
for use in automotive, switch mode
power supply post regulator, and bat-
tery powered systems.
Basic regulator performance character-
istics include a low noise, low drift, 5V
± 4% precision output voltage with low
dropout voltage (1.25V @ IOUT = 500mA)
and low quiescent current (7mA @ IOUT
= 500mA). On board short circuit, ther-
mal, and overvoltage protection make it
possible to use this regulator in particu-
larly harsh operating environments.
The Watchdog logic function monitors
an input signal (WDI) from the micro-
processor or other signal source. When
the signal frequency moves outside
externally programmable window lim-
its, a RESET signal is generated
(RESET). An external capacitor
(CDELAY) programs the watchdog win-
dow frequency limits as well as the
power on reset (POR) and RESET delay.
The RESET function is activated by any
of three conditions: the watchdog sig-
nal moves outside of its preset limits;
the output voltage drops out of regula-
tion by more than 4.5%; or the IC is in
its power up sequence. The RESET sig-
nal is independent of VIN and reliable
down to VOUT = 1V.
In conjunction with the Watchdog, the
ENABLE function controls the regula-
torÕs power consumption. The CS8140Õs
output stage and its attendant circuitry
are enabled by setting the ENABLE
lead high. The regulator goes into sleep
mode (IOUT = 250µA) when the
ENABLE lead goes low and the watch-
dog signal moves outside its preset
window limits. This unique combina-
tion of control functions in the CS8140
gives the microprocessor control over
its own power down sequence: i.e. it
gives the microprocessor the flexibility
to perform housekeeping functions
before it powers down.
The CS8141 has the same features as the
CS8140, except that the CS8141 only
responds to input signals (WDI) which
are below the preset watchdog frequen-
cy threshold.
Block Diagram
VIN
Reference
& Bias
Overvoltage
Overtemperature
ENABLE
WDI
Gnd
Control Logic
ENABLE
RESET
Delay
Watchdog
Regulation
Short Circuit
Undervoltage
VOUT
*
*NOTE: shorted together
on 7 Lead TO-220
Sense
RESET
Delay
Features
s 5V ± 4%, 500mA Output
Voltage
s µP Compatible Control
Functions
Watchdog
RESET
ENABLE
s Low Dropout Voltage
(1.25V @ 500mA)
s Low Quiescent Current
(7mA @ 500mA)
s Low Noise, Low Drift
s Low Current SLEEP Mode
(IQ = 250µA)
s Fault Protection
Thermal Shutdown
Short Circuit
60V Peak Transient
Voltage
Package Options
24 Lead SOIC Wide
NC 1
Delay
WDI
VOUT
Sense
NC
NC
NC
NC
NC
NC
Gnd
RESET
ENABLE
NC
VIN
Gnd
NC
NC
NC
NC
NC
NC
NC
14 Lead PDIP 7 Lead TO-220
Delay 1
RESET
Tab (Gnd)
WDI
VOUT
Sense
NC
NC
NC
ENABLE
VIN
Gnd
NC
NC
NC
1
1 VIN
2 ENABLE
3 RESET
4 Gnd
5 Delay
6 WDI
7 VOUT
Rev. 2/23/99
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




CS8140YTVA7 pdf, 반도체, 판매, 대치품
Typical Performance Characteristics
VOUT vs. VIN over RLOAD; T = 25ûC
5.5
VENABLE = VIN
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
0 12
Rload = NO LOAD
Rload = 6.67W
Rload = 10W
3 456 7
VIN (V)
8
9 10
VOUT vs. VIN over Temperature; RLOAD = 25½
5.5
VENABLE = VIN
5.0
4.5
TEMP = 125°C
4.0
TEMP = -40 °C
3.5
3.0 TEMP = 25°C
2.5
2.0
1.5
1.0
0.5
0.0
0 1 23 4 5 6 78 9
VIN (V)
10
Dropout Voltage vs. Output Current over Temperature
1800
1600
1400
1200
1000
800
600
400
200
0
0
-40°C
25°C
125°C
100 200 300 400 500 600 700 800
IOUT (mA)
Load Regulation vs. Output Current over Temperature
3.5
0
-3.5
-7.0
-10.5
-14.0
-17.5
-21.0
-24.5
-28.0
-31.5
-35.0
0
25°C
-40°C
VIN = 14V
125°C
100 200 300 400 500 600 700 800
IOUT (mA)
Line Regulation vs. Output Current over Temperature
18
16
14
12
10
8
6
4
2
0
-2
-4
-6
0
VIN = 14V
-40°C
25°C
125°C
100 200 300 400 500 600 700 800
IOUT (mA)
4
Quiescent Current vs. Output Current over Temperature
10
VIN = 14V
9 -40°C
8
7
125°C
6
25°C
5
4
0 100 200 300 400 500 600 700 800
IOUT (mA)

4페이지










CS8140YTVA7 전자부품, 판매, 대치품
Figure 3: Timing Diagrams for Watchdog and ENABLE Functions
3a: VOUT when Watchdog is held high and ENABLE = HIGH.
Battery
VIN
ENABLE
WDI 0V
RESET 0V
VOUT 0V
Battery
POR Normal Operation
3b: VOUT when Watchdog is held low and ENABLE = HIGH.
Battery
VIN
ENABLE
WDI 0V
RESET 0V
VOUT 0V
Battery
POR Normal Operation
WDI held High
WDI held Low
3c: VOUT when Watchdog is too slow and ENABLE = HIGH.
Battery
VIN
ENABLE
WDI 0V
Battery
RESET 0V
VOUT 0V
POR Normal Operation
3d: VOUT when Watchdog is too fast and ENABLE = HIGH.
Slow WDI signal
VIN
ENABLE
WDI 0V
Battery
Battery
RESET 0V
VOUT 0V
POR Normal Operation
Fast WDI signal
3e: WDI held high after a normal period of operation; ENABLE = LOW.
Battery
VIN
ENABLE
WDI 0V
Battery
RESET 0V
VOUT 0V
POR
Normal Operation WDI
high
Sleep Mode
POR
3f: WDI held low or is too slow after a normal period of operation; ENABLE = LOW.
Battery
Normal Operation
VIN
ENABLE
Battery
WDI 0V
RESET 0V
VOUT 0V
POR Normal Operation WDI
low
Sleep Mode POR Normal Operation
3g: WDI frequency rises above the upper frequency threshold after a normal period of operation; ENABLE = LOW
(for the CS8140 only).
Battery
VIN
ENABLE
Battery
WDI 0V
RESET 0V
VOUT 0V
POR Normal Operation
Sleep Mode
7
POR Normal Operation

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관련 데이터시트

부품번호상세설명 및 기능제조사
CS8140YTVA7

5V/ 500mA Linear Regulator with ENABLE/ / and Watchdog RESET

Cherry Semiconductor Corporation
Cherry Semiconductor Corporation

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