CHERRY Semiconductor CS8151C Service Manual
5V, 100mA Low Dropout Linear Regulator
with Watchdog, RESET, & Wake Up
The CS8151C is a precision 5V, 100mA
micro-power voltage regulator with
very low quiescent current (400µA typical at 200µA load). The 5V output is
accurate within ±1% and supplies 100
mA of load current with a typical
dropout voltage of 400mV.
Microprocessor control logic includes
Watchdog, Wake Up and . This
unique combination of low quiescent
current and full microprocessor control makes the CS8151C ideal for use in
battery operated, microprocessor controlled equipment.
The CS8151C Wake Up function brings
the microprocessor out of Sleep mode.
The microprocessor in turn, signals its
Wake Up status back to the CS8151C
by issuing a Watchdog signal.
The Watchdog logic function monitors
an input signal (WDI) from the microprocessor. The CS8151C responds to
the falling edge of the Watchdog signal
which it expects at least once during
each wake-up period. When the correct Watchdog signal is received, a
falling edge is issued on the wake-up
signal line.
is independent of V
IN
and
operates correctly to an output voltage
as low as 1V. A signal is issued
in any of three situations. During
power up the is held low until
the output voltage is in regulation.
During operation if the output voltage
shifts below the regulation limits, the
toggles low and remains low
until proper output voltage regulation
is restored. And finally, a signal
is issued if the regulator does not
receive a Watchdog signal within the
Wake Up period.
The pulse width, Wake Up signal frequency, and Wake Up delay
time are all set by one external capacitor C
Delay
.
The regulator is protected against
short circuit, over voltage, and thermal
runaway conditions. The device can
withstand 74 volt load dump transients, making it suitable for use in
automotive environments.
RESET
RESET
RESET
RESET
RESET
RESET
RESET
1
Features
■
5V ±1% / 100 mA Output
Voltage
■
Micropower Compatible
Control Functions:
Wake Up
Watchdog
■
Low Dropout Voltage:
400mV @ 100mA
■
Low Sleep Mode Quiescent
Current (400µA typ)
■
Protection Features:
Thermal Shutdown
Short Circuit
74V Load Dump
Reverse Transient (-50V)
RESET
Package Options
8 Lead PDIP
CS8151C
V
IN
WDI
WAKE UP
RESET Delay
N/C
Gnd
V
OUT
CS8151C
Description
Block Diagram
A Company
¨
Rev. 3/17/99
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
查询CS8151CGN8供应商
1
V
IN
Delay
WDI
Falling Edge
Detector
V
RESET
Timing
Circuit
OUT
Current Source
(Circuit Bias)
RESET
Circuit
WATCHDOG
Circuit
Over
Voltage
Shutdown
+ -
Error
Thermal
Shutdown
Bandgap
Reference
Amplifier
WAKE UP
Circuit
Current Limit
Sense
V
OUT
V
OUT
WAKE UP
Sense
Gnd
2
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Absolute Maximum Ratings
Power Dissipation.............................................................................................................................................Internally Limited
Output Current (V
OUT
, , Wake Up) ...................................................................................................Internally Limited
Reverse Battery..........................................................................................................................................................................-15V
Maximum Load Dump Transient .........................................................................................................................................+74V
Maximum Negative Transient (t<2ms) .................................................................................................................................-50V
ESD Susceptibility (Human Body Model)..............................................................................................................................2kV
ESD Susceptibility (Machine Model).....................................................................................................................................200V
Logic Inputs/Outputs ................................................................................................................................................-0.3V to +6V
Storage Temperature Range................................................................................................................................-55¡C to +150¡C
Lead Temperature Soldering
Wave Solder (through hole styles only) .....................................................................................10 sec. max, 260¡C peak
RESET
CS8151C
Electrical Characteristics: TA= 0¡C to 70¡C, 0¡C ² TJ² 125¡C, 6V ² VIN² 26V, I
OUT
= 100µA to 100mA,
C2 = 47µF (ESR < 8½), C
Delay
= 0.1µF (unless otherwise noted)
■ Output Section
Output Voltage, V
OUT
9V < VIN< 16V 4.95 5.00 5.05 V
6V < VIN< 26V, 0 < I
OUT
< 100mA 4.90 5.00 5.10 V
Dropout Voltage (VIN- V
OUT
)I
OUT
= 100mA 400 600 mV
I
OUT
= 100µA 100 150 mV
Load Regulation VIN= 14V, 100µA < I
OUT
< 100mA 10 50 mV
Line Regulation I
OUT
= 1mA, 6V < V
IN
< 26V 10 50 mV
Ripple Rejection 7V < V
IN
< 17V @ f = 120Hz, 60 75 dB
I
OUT
= 100mA
Current Limit V
OUT
= 4.5V 100 250 mA
Thermal Shutdown 150 180 210 ¡C
Overvoltage Shutdown V
OUT
< 1V 50 56 62 V
Quiescent Current I
OUT
= 200µA (Sleep) 0.40 0.75 mA
I
OUT
= 50mA 4 mA
I
OUT
= 100mA (Wake Up) 12 20 mA
Reverse Current V
OUT
= 5V, VIN= 0V 1.0 1.5 mA
■
Threshold High (RTH) RTH V
OUT
Increasing V
OUT
- 0.3 V
OUT
- 0.04 V
Threshold Low (RTL) RTL V
OUT
Decreasing 4.50 4.70 4.91 V
Hysteresis RTH Ð RTL 150 200 250 mV
Output
LOW 1V < V
OUT
< RTL, I
OUT
= 25µA 0.2 0.8 V
HIGH I
OUT
= 25µA, V
OUT
> RTH 3.8 4.2 5.1 V
Current Limit = 0V, V
OUT
> V
RTH
(sourcing) 0.025 0.50 1.30 mA
= 5V, V
OUT
> 1V (sinking) 0.1 12 80 mA
Delay Time POR Mode 3 5 7 ms
RESET
RESET
RESET
Package Lead Description
Package Lead # Lead Symbol Function
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
■ Watchdog Input
Threshold
HIGH 1.4 2.0 V
LOW 0.8 1.3 V
Hysteresis 25 100 mV
Input Current 0 < WDI < 6V -10 0 +10 µA
Pulse Width 50% WDI falling edge to 5 µs
50% WDI rising edge and
50% WDI rising edge to 50%
WDI falling edge (see Figure 1)
■ Wake Up Output
Wake Up Period see Figure 1a 30 40 50 ms
Wake Up Duty Cycle nominal see Figure 1c 40 50 60 %
HIGH to Wake Up 50% rising edge to 15 20 25 ms
Rising Delay Time 50% Wake Up edge
(see Figure 1)
Wake Up Response 50% WDI falling edge to 2 10 µs
to Watchdog Input 50% Wake Up falling edge
Wake Up Response 50% falling edge to 2 10 µs
to 50% Wake Up falling edge
V
OUT
= 5V®4.5V
Output
LOW I
OUT
= 25µA(sinking) 0.2 0.8 V
HIGH I
OUT
= 25µA(sourcing) 3.8 4.2 5.1 V
Current Limit Wake Up = 5V 0.025 1.00 7.00 mA
Wake Up = 0V .05 3.50 mA
RESET
RESET
RESETRESET
8 L PDIP
1V
IN
Supply voltage to the IC.
2 WDI CMOS/TTL compatible input lead. The watchdog function monitors
the falling edge of the incoming signal.
3 Wake Up CMOS/TTL compatible output consisting of a continuously generated
signal used to Wake Up the microprocessor from sleep mode.
4 CMOS/TTL compatible output lead goes low whenever V
OUT
drops by more than 6% from nominal, or during the absence of a correct watchdog signal.
5 Delay Input lead from timing capacitor for and Wake Up signal.
7 Gnd Ground Connection
8V
OUT
Regulated output voltage 5V ± 2%.
RESET
RESETRESET
3
CS8151C
Electrical Characteristics: TA= 0¡C to 70¡C, 0¡C ² TJ² 125¡C, 6V ² VIN² 26V, I
OUT
= 100µA to 100mA,
C2 = 47µF (ESR < 8½), C
Delay
= 0.1µF (unless otherwise noted)
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