Cherry Semiconductor CS8151YTVA7, CS8151YT7, CS8151YNF16, CS8151YDWFR16, CS8151YDWF16 Datasheet
...
5V, 100mA Low Dropout Linear Regulator
with WATCHDOG, RESET, & WAKE UP
The CS8151 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 ±2% 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 CS8151 ideal for use in
battery operated, microprocessor controlled equipment.
The CS8151 WAKE UP function brings
the microprocessor out of Sleep mode.
The microprocessor in turn, signals its
WAKE UP status back to the CS8151
by issuing a WATCHDOG signal.
The WATCHDOG logic function monitors an input signal (WDI) from the
microprocessor. The CS8151 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 ±2% / 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
16 Lead PDIP
16 Lead SOIC Wide*
(Internally Fused)
CS8151
N/C
N/C
N/C
N/C
Gnd
Gnd
Gnd
Gnd
Sense
V
OUT
Delay
______
RESET
WAKE UP
WDI
V
IN
*N/C
* For SO Wide package, pin # 6 is Gnd
CS8151
Description
Block Diagram
7 Lead TO-220
Tab (Gnd)
7 Lead D2PAK
Tab (Gnd)
1
1. V
OUT
2. V
IN
3. WDI
4. Gnd
5. WAKE UP
6.
7. Delay
RESET
A Company
¨
Rev. 5/4/99
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
1
V
IN
Delay
WDI
RESET
Timing
Circuit
Falling Edge
Detector
V
OUT
Current Source
(Circuit Bias)
WATCHDOG
RESET
Circuit
Voltage
Shutdown
Thermal
Shutdown
Circuit
Bandgap
Reference
Over
+ -
WAKE UP
Circuit
Error
Amplifier
Current Limit
Sense
V
OUT
internally
connected on
V
TO-220 and
OUT
D2PAK
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
Reflow (SMD styles only) ......................................................................................60 sec. max above 183¡C, 230¡C peak
RESET
CS8151
Electrical Characteristics: TA = -40¡C to +125¡C, -40¡C ² TJ ² 150¡C, 6V ² V
IN
² 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 4.90 5.00 5.10 V
6V < VIN< 26V, 0 < I
OUT
< 100mA 4.85 5.00 5.15 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
3
Package Lead Description
Package Lead # Lead Symbol Function
Electrical Characteristics: continued
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
CS8151
■ 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
7L TO-220 & 16 L PDIP 16L SOIC
7L D
2
PAK (internally fused) (internally fused)
299V
IN
Supply voltage to the IC.
3 11 11 WDI CMOS/TTL compatible input lead. The watchdog function
monitors the falling edge of the incoming signal.
4 4,5,12,13 4,5,6,12,13 Gnd Ground Connection
7 16 16 Delay Input lead from timing capacitor for and WAKE UP
signal.
6 15 15 CMOS/TTL compatible output lead goes low when-
ever V
OUT
drops by more than 6% from nominal, or during
the absence of a correct watchdog signal.
5 14 14 WAKE UP CMOS/TTL compatible output consisting of a continuously
generated signal used to WAKE UP the microprocessor from
sleep mode.
188V
OUT
Regulated output voltage 5V ± 2%.
7 7 Sense Kelvin connection which allows remote sensing of the output
voltage for improved regulation. If remote sensing is not
required, connect to V
OUT
.
RESETRESET
RESET
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