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부품번호 | CS8481 기능 |
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기능 | Micropower Low Dropout Regulator | ||
제조업체 | ON Semiconductor | ||
로고 | |||
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CS8481
3.3 V/250 mA, 5.0 V/100 mA
Micropower Low Dropout
Regulator with ENABLE
The CS8481 is a precision, dual Micropower linear voltage
regulator. The switched 3.3 V primary output (VOUT1) supplies up to
250 mA while the secondary 5.0 V (VOUT2) is capable of supplying
100 mA. Both outputs have a maximum dropout voltage of 600 mV
and low reverse current. Quiescent current drain is typically 150 mA
when supplying 100 mA from each output.
The ENABLE input provides logic level control of the primary
output. With the primary output disabled, quiescent current drain is
typically 100 mA when supplying 100 mA from the secondary output.
The CS8481 is extremely robust with protection provided for
reverse battery, short circuit, overvoltage, and overtemperature on
both outputs.
The CS8481 is available in a D2PAK−5.
Features
• 3.3 V/250 mA Primary Output
• 5.0 V/100 mA Secondary Output
• 3.0% Tolerance, Both Outputs
• ON/OFF Control for Primary Output
• Low Quiescent Current Drain (100 mA VOUT2)
• Low Reverse Current
• Protection Features
− Reverse Battery (−15 V)
− 74 V Peak Transient Voltage
− Short Circuit
− Overtemperature
− Overvoltage (34 V)
http://onsemi.com
1
5
D2PAK−5
DP SUFFIX
CASE 936AC
PIN CONNECTIONS AND
MARKING DIAGRAM
CS8481
AWLYWW
1
Tab = GND
Pin 1. VIN
2. VOUT1
3. GND
4. VOUT2
5. ENABLE
A = Assembly Location
WL, L = Wafer Lot
YY, Y = Year
WW, W = Work Week
ORDERING INFORMATION*
Device
CS8481YDP5
Package
D2PAK−5
Shipping†
50 Units/Rail
CS8481YDPR5 D2PAK−5 750 Tape & Reel
*Consult your local sales representative for SO−8,
SO−16, DIP−8, DIP−16, TO−220−5, and D2PAK−7
packaging options.
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specifications
Brochure, BRD8011/D.
© Semiconductor Components Industries, LLC, 2004
January, 2004 − Rev. 9
1
Publication Order Number:
CS8481/D
CS8481
DEFINITION OF TERMS
Current Limit − Peak current that can be delivered to the
output.
Dropout Voltage − The input−output voltage differential
at which the circuit ceases to regulate against further
reduction in input voltage. Measured when the output
voltage has dropped 100 mV from the nominal value
obtained at 14 V input, dropout voltage is dependent upon
load current and junction temperature.
Input Output Differential − The voltage difference
between the unregulated input voltage and the regulated
output voltage for which the regulator will operate.
Input Voltage − The DC voltage applied to the input
terminals with respect to ground.
Line Regulation − The change in output voltage for a
change in the input voltage. The measurement is made under
conditions of low dissipation or by using pulse techniques
such that the average chip temperature is not significantly
affected.
Load Regulation − The change in output voltage for a
change in load current at constant chip temperature.
Long Term Stability − Output voltage stability under
accelerated life−test conditions after 1000 hours with
maximum rated voltage and junction temperature.
Quiescent Current − The part of the positive input
current that does not contribute to the positive load current,
i.e., the regulator ground lead current.
Ripple Rejection − The ratio of the peak−to−peak input
ripple voltage to the peak−to−peak output ripple voltage.
Short Circuit Current Limit − Peak current that can be
delivered by the outPut when forced to 0 V.
Temperature Stability of VOUT − The percentage
change in output voltage for a thermal variation from room
temperature to either temperature extreme.
VIN 14 V
74 V
34 V
30 V
3.0 V
14 V
ENABLE
2.0 V
0.8 V
VOUT1 0 V
VOUT2 5.0 V
3.3 V
5.0 V
3.3 V
2.4 V
5.0 V
2.4 V
3.3 V
3.3 V
3.3 V
0V 0V
5.0 V
5.0 V
0V
5.0 V
3.3 V
0V
5.0 V
System
Condition
Turn
On
Load
Dump
Low VIN
Line
VOUT1
Noise, Etc. Short
Circuit
Figure 2. Typical Circuit Waveform
VOUT2
Short
Circuit
Thermal
Shutdown
Turn
Off
APPLICATION NOTES
General
The CS8481 is a Micropower dual regulator. All bias
required to operate the internal circuitry is derived from the
standby output, VOUT2. If this output experiences an over
current situation and collapses, then VOUT1 will also
collapse (see Figure 2).
If there is critical circuitry that must remain active under
most conditions it should be connected to VOUT2. Any
circuitry that is likely to be subjected to a short circuit, e.g.,
circuitry outside the module, should be connected to VOUT1.
External Capacitors
Output capacitors are required for stability with the
CS8481. Without them, the regulator outputs will oscillate.
Actual size and type may vary depending upon the
application load and temperature range. Capacitor effective
series resistance (ESR) is also a factor in the IC stability.
Worst−case is determined at the minimum ambient
temperature and maximum load expected.
Output capacitors can be increased in size to any desired
value above the minimum. One possible purpose of this
would be to maintain the output voltages during brief
conditions of negative input transients that might be
characteristic of a particular system.
Capacitors must also be rated at all ambient temperatures
expected in the system. To maintain regulator stability down
to −40°C, capacitors rated at that temperature must be used.
More information on capacitor selection for SMART
REGULATOR®s is available in the SMART REGULATOR
application note, “Compensation for Linear Regulators,”
document number SR003AN/D, available through the
Literature Distribution Center or via our website at
http://www.onsemi.com.
http://onsemi.com
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부품번호 | 상세설명 및 기능 | 제조사 |
CS8481 | Micropower Low Dropout Regulator | ON Semiconductor |
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