cs8371 ON Semiconductor, cs8371 Datasheet - Page 8

• Manufacturer Part Number: cs8371
• Description: 8.0 V/1.0 A, 5.0 V/250 Ma Dual Regulator With Independent Output Enables And Nocap
• Manufacturer: ON Semiconductor

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.
output.
terminals with respect to ground.
between the unregulated input voltage and the regulated
output voltage for which the regulator will operate.
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.
is ideal for applications where each load must be switched
independently. In an automotive radio, the 8.0 V output
drives the displays and tape drive motors while the 5.0 V
output supplies the Tuner IC and memory.
Stability Considerations/NOCAP
(or any type requiring a slow lateral PNP in the control loop)
necessitates a large external compensation capacitor at the
output of the IC. The external capacitor is also used to curtail
overshoot, determine startup delay time and load transient
response.
bandwidth, display overshoot and poor ripple rejection.
Compensation is also an issue because the high frequency
Dropout Voltage − The input−output voltage differential
Current Limit − Peak current that can be delivered to the
Input Voltage − The DC voltage applied to the input
Input Output Differential − The voltage difference
Line Regulation − The change in output voltage for a
With seperate control of each output channel, the CS8371
Normally a low dropout or quasi−low dropout regulator
Traditional LDO regulators typically have low unity gain
* C
1
Control
is required if the regulator is far from the power source filter.
C
0.1 mF
1
*
Figure 23. Applications Circuit
DEFINITION OF TERMS
APPLICATION NOTES
ENABLE
ENABLE
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CS8371
1
2
8
GND
V
IN
change in load current at constant chip temperature.
accelerated life−test conditions after 1000 hours with
maximum rated voltage and junction temperature.
output, with constant load and no input ripple, measured
over a specified frequency range.
current that does not contribute to the positive load current.
The regulator ground lead current.
ripple voltage to the peak−to−peak output ripple voltage.
change in output voltage for a thermal variation from room
temperature to either temperature extreme.
load capacitor value, ESR (Equivalent Series Resistance)
and board layout parasitics all can create oscillations if not
properly accounted for.
which internally compensates the LDO regulator over
temperature, load and line variations without the need for
an expensive external capacitor. It incorporates high gain
(>80 dB) and large unity gain bandwidth (>100 kHz) while
maintaining many of the characteristics of a single−pole
amplifier (large phase margin and no overshoot).
loads. If the load displays large transient current
requirements, such as with high frequency microprocessors,
an output storage capacitor may be needed. Some large
capacitor and small capacitor ESR values at the output may
Load Regulation − The change in output voltage for a
Long Term Stability − Output voltage stability under
Output Noise Voltage − The rms AC voltage at the
Quiescent Current − The part of the positive input
Ripple Rejection − The ratio of the peak−to−peak input
Temperature Stability of V
NOCAP is an ON Semiconductor exclusive output stage
NOCAP is ideally suited for slow switching or steady
V
V
OUT1
OUT2
8.0 V
5.0 V
Tuner IC
OUT
− The percentage