CS8391 Cherry Semiconductor Corporation, CS8391 Datasheet - Page 3

• Manufacturer Part Number: CS8391
• Description: 5V/250mA/ 5V/100mA Micropower Low Dropout Regulator with ENABLE
• Manufacturer: Cherry Semiconductor Corporation

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 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 Output Differential
The voltage difference between the unregulated input volt-
age and the regulated output voltage for which the regula-
tor 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.
Condition
ENABLE
System
V
V
OUT
OUT
V
IN
1
2
PACKAGE LEAD #
5 Lead D
2.0V
0.8V
14V
0V
5V
Turn
1
2
3
4
5
On
2
PAK
45V
5V
5V
Dump
Load
31V
LEAD SYMBOL
V
V
Gnd
V
ENABLE
5V
5V
IN
OUT1
OUT2
Low V
IN
2.4V
2.4V
3V
Package Lead Description
Typical Circuit Waveform
Definition of Terms
Line Noise, Etc.
26V
Supply voltage to IC, usually direct from battery.
5V regulated output which is activated by ENABLE input.
Ground connection.
Standby output 5V, 100mA capability; always on.
CMOS compatible input lead; switches V
high, V
5V
5V
3
OUT1
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 condi-
tions after 1000 hours with maximum rated voltage and
junction temperature.
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.
Short Circuit Current Limit
Peak current that can be delivered by the output when
forced to 0V.
Temperature Stability of V
The percentage change in output voltage for a thermal varia-
tion from room temperature to either temperature extreme.
Circuit
V
Short
OUT
is active.
1
0V
5V
5V
Circuit
V
Short
OUT2
FUNCTION
0V
0V
OUT
OUT1
Shutdown
5V
5V
Thermal
. When ENABLE is
14V
5V
5V
Turn
Off
0V