CS8164YT5 CHERRY [Cherry Semiconductor Corporation], CS8164YT5 Datasheet - Page 5

• Manufacturer Part Number: CS8164YT5
• Description: 8V/5V Low Dropout Dual Regulator with ENABLE
• Manufacturer: CHERRY [Cherry Semiconductor Corporation]

Dropout Voltage
The input-output voltage differential at which the circuit
ceases to regulate against further reduction in input volt-
age. Measured when the output voltage has dropped
100mV from the nominal value obtained at 14V input,
dropout voltage is dependent upon load current and junc-
tion temperature.
Input Voltage
The DC voltage applied to the input terminals with respect
to ground.
Input Output Differential
The voltage difference between the unregulated input
voltage and the regulated output voltage for which the
regulator will operate.
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.
The CS8164 is equipped with two outputs. The second
output is intended for use in systems requiring standby
memory circuits. While the high current primary output
can be controlled with the ENABLE lead described below,
the standby output remains on under all conditions as long
as sufficient input voltage is applied to the IC. Thus, mem-
ory and other circuits powered by this output remain unaf-
fected by positive line transients, thermal shutdown, etc.
Condition
ENABLE
System
V
V
OUT1
OUT2
V
IN
2.0V
0.8V
14V
0V
5V
Turn
On
Standby Output
60V
8V
Dump
Load
5V
31V
8V
Low V
Typical Circuit Waveform
Definition of Terms
Circuit Description
IN
2.4V
2.4V
3V
Line Noise, Etc.
5
26V
Long Term Stability
Output voltage stability under accelerated life-test condi-
tions after 1000 hours with maximum rated voltage and
junction temperature.
Output Noise Voltage
The rms AC voltage at the output, with constant load and
no input ripple, measured over a specified frequency
range.
Quiescent Current
The part of the positive input current that does not con-
tribute 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.
Temperature Stability of V
The percentage change in output voltage for a thermal
variation from room temperature to either temperature
extreme.
Current Limit
Peak current that can be delivered to the output.
The standby regulator circuit is designed so that the quies-
cent current to the IC is very low (<2mA) when the other
regulator output is off.
In applications where the standby output is not needed, it
may be disabled by connecting a resistor from the standby
output to the supply voltage. This eliminates the need for
a capacitor on the output to prevent unwanted oscilla-
tions. The value of the resistor depends upon the mini-
mum input voltage expected for a given system. Since the
standby output is shunted with an internal 6.0V Zener, the
current through the external resistor should be sufficient
8V
Circuit
V
Short
OUT2
0V
OUT
Shutdown
8V
5V
Thermal
14V
8V
Turn
Off
0V