CS8101YDR8 Datasheet PDF - Cherry Semiconductor Corporation
| Part Number | CS8101YDR8 | |
| Description | Micropower 5V/ 100mA Low Dropout Linear Regulator with RESET and ENABLE | |
| Manufacturers | Cherry Semiconductor Corporation | |
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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
Email: [email protected]
Web Site: www.cherry-semi.com
1 A ¨ Company
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Application Notes: continued
Table 1. Logic Control of CS8101 Output
Microprocessor
I/O drive
Switch
ENABLE
Output
ON
Closed
LOW
ON
Open
LOW
ON
OFF
Closed
LOW
ON
Open
HIGH
OFF
The I/O port of the microprocessor typically provides
50µA to Q1. In automotive applications the SWITCH is
connected to the ignition switch.
Stability Considerations
The output or compensation capacitor helps determine
three main characteristics of a linear regulator: start-up
delay, load transient response and loop stability.
VIN
CIN*
0.1mF
VOUT
CS8101
RESET
ENABLE
RRST
COUT**
10mF
*CIN required if regulator is located far from the power supply filter.
** COUT required for stability. Capacitor must operate at minimum
temperature expected.
increase the load current slowly from zero to full load
while observing the output for any oscillations. If no oscil-
lations are observed, the capacitor is large enough to
ensure a stable design under steady state conditions.
Step 3: Increase the ESR of the capacitor from zero using
the decade box and vary the load current until oscillations
appear. Record the values of load current and ESR that
cause the greatest oscillation. This represents the worst
case load conditions for the regulator at low temperature.
Step 4: Maintain the worst case load conditions set in step
3 and vary the input voltage until the oscillations increase.
This point represents the worst case input voltage conditions.
Step 5: If the capacitor is adequate, repeat steps 3 and 4
with the next smaller valued capacitor. A smaller capacitor
will usually cost less and occupy less board space. If the
output oscillates within the range of expected operating
conditions, repeat steps 3 and 4 with the next larger stan-
dard capacitor value.
Step 6: Test the load transient response by switching in
various loads at several frequencies to simulate its real
working environment. Vary the ESR to reduce ringing.
Step 7: Remove the unit from the environmental chamber
and heat the IC with a heat gun. Vary the load current as
instructed in step 5 to test for any oscillations.
Once the minimum capacitor value with the maximum
ESR is found, a safety factor should be added to allow for
the tolerance of the capacitor and any variations in regula-
tor performance. Most good quality aluminum electrolytic
capacitors have a tolerance of ±20% so the minimum value
found should be increased by at least 50% to allow for this
tolerance plus the variation which will occur at low tem-
peratures. The ESR of the capacitor should be less than
50% of the maximum allowable ESR found in step 3 above.
Figure 5. Test and application circuit showing output compensation.
The capacitor value and type should be based on cost,
availability, size and temperature constraints. A tantalum
or aluminum electrolytic capacitor is best, since a film or
ceramic capacitor with almost zero ESR can cause instabili-
ty. The aluminum electrolytic capacitor is the least expen-
sive solution, but, if the circuit operates at low tempera-
tures (-25¡C to -40¡C), both the value and ESR of the
capacitor will vary considerably. The capacitor manufac-
turers data sheet usually provides this information.
The value for the output capacitor COUT shown in Figure 5
should work for most applications, however it is not nec-
essarily the optimized solution.
To determine an acceptable value for COUT for a particular
application, start with a tantalum capacitor of the recom-
mended value and work towards a less expensive alterna-
tive part.
Step 1: Place the completed circuit with a tantalum capac-
itor of the recommended value in an environmental cham-
ber at the lowest specified operating temperature and
monitor the outputs with an oscilloscope. A decade box
connected in series with the capacitor will simulate the
higher ESR of an aluminum capacitor. Leave the decade
box outside the chamber, the small resistance added by the
longer leads is negligible.
Step 2: With the input voltage at its maximum value,
Calculating Power Dissipation
in a Single Output Linear Regulator
The maximum power dissipation for a single output regu-
lator (Figure 6) is:
PD(max) = {VIN(max) - VOUT(min)}IOUT(max) + VIN(max)IQ (1)
where:
VIN(max) is the maximum input voltage,
VOUT(min) is the minimum output voltage,
IOUT(max) is the maximum output current for the applica-
tion, and
IQ is the quiescent current the regulator consumes at
IOUT(max).
Once the value of PD(max) is known, the maximum permis-
sible 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.
5
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