CS8221YDFR8G ON Semiconductor, CS8221YDFR8G Datasheet - Page 4

• Manufacturer Part Number: CS8221YDFR8G
• Description: IC REG LDO 100MA 5V MCRPWR 8SOIC
• Manufacturer: ON Semiconductor

Specifications of CS8221YDFR8G

• Regulator Topology: Positive Fixed
• Voltage - Output: 5V
• Voltage - Input: 6 ~ 26 V
• Voltage - Dropout (typical): 0.4V @ 100mA
• Number Of Regulators: 1
• Current - Output: 100mA
• Current - Limit (min): 125mA
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Output Stage Protection
circuit and thermal runaway conditions (Figure 3).
down. This response protects the internal circuitry and
enables the IC to survive unexpected voltage transients.
three main characteristics of a linear regulator: start−up
delay, load transient response and loop stability.
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
instability. The aluminum electrolytic capacitor is the least
expensive solution, but, if the circuit operates at low
temperatures (−25°C to −40°C), both the value and ESR of
the capacitor will vary considerably. The capacitor
manufacturers data sheet usually provides this information.
4 should work for most applications, however it is not
necessarily the optimized solution.
application, start with a tantalum capacitor of the
recommended value and work towards a less expensive
alternative part.
capacitor of the recommended value in an environmental
chamber 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.
V
The output stage is protected against overvoltage, short
I
If the input voltage rises above 30 V, the output shuts
The output or compensation capacitor helps determine
The capacitor value and type should be based on cost,
The value for the output capacitor C
To determine an acceptable value for C
Step 1: Place the completed circuit with a tantalum
OUT
VOLTAGE REFERENCE AND OUTPUT CIRCUITRY
V
OUT
IN
Figure 3. Typical Circuit Waveforms for Output
> 30 V
Dump
Load
STABILITY CONSIDERATIONS
Stage Protection
Circuit
Short
OUT
Shutdown
Thermal
OUT
shown in Figure
for a particular
CIRCUIT DESCRIPTION
APPLICATION NOTES
http://onsemi.com
4
exceed 180°C (typ) the power transistor is turned off.
Thermal shutdown is an effective means to prevent die
overheating since the power transistor is the principle heat
source in the IC.
0.1 mF
increase the load current slowly from zero to full load while
observing the output for any oscillations. If no oscillations
are observed, the capacitor is large enough to ensure a stable
design under steady state conditions.
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 3 and vary the input voltage until the oscillations
increase. This point represents the worst case input voltage
conditions.
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 standard
capacitor value.
various loads at several frequencies to simulate its real
working environment. Vary the ESR to reduce ringing.
temperature. Vary the load current as instructed in step 5 to
test for any oscillations.
*C
**C
Should the junction temperature of the power device
Step 2: With the input voltage at its maximum value,
Step 3: Increase the ESR of the capacitor from zero using
Step 4: Maintain the worst case load conditions set in
Step 5: If the capacitor is adequate, repeat steps 3 and 4
Step 6: Test the load transient response by switching in
Step 7: Increase the temperature to your highest operating
C
1
2
is required if regulator is far from the power source filter
1
is required for stability.
*
Figure 4. Application and Test Diagram
V
IN
CS8221
GND
V
OUT
.
10 mF
C
2
**