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CS8101 데이터시트 PDF




Cherry Semiconductor Corporation에서 제조한 전자 부품 CS8101은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

PDF 형식의 CS8101 자료 제공

부품번호 CS8101 기능
기능 Micropower 5V/ 100mA Low Dropout Linear Regulator with RESET and ENABLE
제조업체 Cherry Semiconductor Corporation
로고 Cherry Semiconductor Corporation 로고


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CS8101 데이터시트, 핀배열, 회로
CS8101
Micropower 5V, 100mA Low Dropout
Linear Regulator with RESET and ENABLE
Description
Features
The CS8101 is a precision 5V
micropower voltage regulator with
very low quiescent current (70µA
typ at 100µA load). The 5V output is
accurate within ±2% and supplies
100mA of load current with a typi-
cal dropout voltage of only 400mV.
Microprocessor control logic
includes an ENABLE input and an
active RESET. This combination of
low quiescent current, outstanding
regulator performance and control
logic makes the CS8101 ideal for
any battery operated, microproces-
sor controlled equipment.
The active RESET circuit includes
hysteresis, and operates correctly at
an output voltage as low as 1V. The
RESET function is activated during
the power up sequence or during
normal operation if the output
voltage drops outside the regulation
limits by more than 200mV typ. The
logic level compatible ENABLE
input allows the user to put the reg-
ulator into a shutdown mode where
it draws only 20µA typical of quies-
cent current.
The regulator is protected against
reverse battery, short circuit, over
voltage, and thermal overload con-
ditions. The device can withstand
load dump transients making it
suitable for use in automotive envi-
ronments.
The CS8101 is functionally equiva-
lent to the National Semiconductor
LP2951 series low current regula-
tors.
Block Diagram
VIN
ENABLE
RESET
Current Source
(Circuit Bias)
Over
Voltage
Shutdown
Current Limit
Sense
Thermal
Protection
Bandgap
Reference
+
-
Reset
Comparator
+ - Error
Amplifier
VOUT
Internally connected
on 5 lead TO-220
VOUTSense
Gnd
s 5V ±2% Output
s Low 70µA Quiescent
Current
s Active RESET
s ENABLE Input for
ON/OFF and Active/Sleep
Mode Control
s 100mA Output Current
Capability
s Fault Protection
+60V Peak Transient
Voltage
-15V Reverse Voltage
Short Circuit
Thermal Overload
s Low Reverse Current
(Output to Input)
Package Options
20L SOIC Wide
(Internally Fused Leads)
ENABLE 1
NC
NC
Gnd
Gnd
Gnd
Gnd
NC
NC
RESET
VOUT
NC VIN
NC
Gnd
Gnd
Gnd
Gnd
NC
NC
NC
5L TO-220
Tab (Gnd)
8L SOIC
VOUT 1
VOUTSense
ENABLE
Gnd
VIN
NC
NC
RESET
1. VOUT
2. ENABLE
3. Gnd
4. RESET
5. VIN
Other Packages: D2PAK (consult factory)
Rev. 4/9/99
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




CS8101 pdf, 반도체, 판매, 대치품
VOUT
CS8101
RRST
Circuit Description: continued
based applications. RC values can be chosen using the
following formula:
COUT
5V to mP
and
System
Power
[ ( ) ]RTOTCRST =
ln
ÐtDelay
VT Ð VOUT
VRST Ð VOUT
RESET
CRST
to mP
RESET
Port
Figure 3. RC Network for RESET Delay
An external RC network on the RESET lead (Figure 3) pro-
vides a sufficiently long delay for most microprocessor
where:
RRST = RESET Delay resistor
RIN = µP port impedance
RTOT = RRST in parallel with RIN
CRST = RESET Delay capacitor
tDelay = desired delay time
VRST = VSAT of RESET lead (0.7V @ turn - ON)
VT = RESET threshold
Applications Notes
VBAT
0.1mF
500kW
VIN VOUT
CS8101
ENABLE
RESET
Gnd
RRST
CRST
VCC
COUT
mP
RESET
I/O Port
SWITCH
Q1
500kW
100kW
100kW
Figure 4. Microprocessor Control of CS8101 using external switching transistor Q1.
The circuit depicted in Figure 4 lets the microprocessor
control its power source, the CS8101 regulator. An I/O
port on the µP and the SWITCH port are used to drive the
base of Q1. When Q1 is driven into saturation, the voltage
on the ENABLE lead falls below its lower threshold. The
regulatorÕs output is enabled. When the drive current is
removed, the voltage on the ENABLE lead rises, the out-
put is switched off and the IC moves into Sleep mode
where it draws 50µA (max).
By coupling these two controls with the ENABLE lead, the
system has added flexibility. Once the system is running,
the state of the SWITCH is irrelevant as long as the I/O
port continues to drive Q1. The microprocessor can turn
off its own power by withdrawing drive current, once the
SWITCH is open. This software control at the I/O port
allows the microprocessor to finish key housekeeping
functions before power is removed.
The logic options are summarized in Table 1.
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CS8101 전자부품, 판매, 대치품
Package Specification
PACKAGE DIMENSIONS IN mm (INCHES)
PACKAGE THERMAL DATA
Lead Count
8L SOIC
20L SOIC
Metric
Max Min
5.00 4.80
13.00 12.60
D
English
Max Min
.197 .189
.512 .496
Thermal Data
RQJC typ
RQJA typ
8 Lead
SOIC
45
165
20 Lead
SOIC Wide
9
55
5 Lead
TO-220
3.3
50
ûC/W
ûC/W
Surface Mount Narrow Body (D); 150 mil wide
4.00 (.157)
3.80 (.150)
6.20 (.244)
5.80 (.228)
0.51 (.020)
0.33 (.013)
1.27 (.050)
0.40 (.016)
0.25 (.010)
0.19 (.008)
1.57 (.062)
1.37 (.054)
REF: JEDEC MS-012
1.27 (.050) BSC
1.75 (.069) MAX
0.25 (0.10)
0.10 (.004)
D
Surface Mount Wide Body (DW); 300 mil wide
7.60 (.299)
7.40 (.291)
10.65 (.419)
10.00 (.394)
0.51 (.020)
0.33 (.013)
2.49 (.098)
2.24 (.088)
1.27 (.050) 0.32 (.013)
0.40 (.016) 0.23 (.009)
REF: JEDEC MS-013
D
1.27 (.050) BSC
2.65 (.104)
2.35 (.093)
0.30 (.012)
0.10 (.004)
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