CS8101 Cherry Semiconductor Corporation, CS8101 Datasheet - Page 3

• Manufacturer Part Number: CS8101
• Description: Micropower 5V/ 100mA Low Dropout Linear Regulator with RESET and ENABLE
• Manufacturer: Cherry Semiconductor Corporation

The output stage is protected against overvoltage, short
circuit and thermal runaway conditions (Figure 1).
Figure 1. Typical Circuit Waveforms for Output Stage Protection.
If the input voltage rises above 30V (e.g. load dump), the out-
put shuts down. This response protects the internal circuitry
and enables the IC to survive unexpected voltage transients.
Should the junction temperature of the power device exceed
180ûC (typ) the load current capability is reduced thereby
preventing thermal overload. This thermal management
function is an effective means to prevent die overheating
since the load current is the principle heat source in the IC.
The CS8101 contains two microprocessor compatible con-
trol functions:
V OUT
I OUT
8 Lead
V IN
SOIC
6,7
8
1
3
4
5
2
Voltage Reference and Output Circuitry
(Internally Fused Leads)
Dump
Load
> 30V
2,3,8,9,11,12,13,18
PACKAGE LEAD #
20 Lead SOIC
ENABLE
Regulator Control Functions
14,15,16,17
Output Stage Protection
4,5,6,7
19
20
10
1
Current
Limit
and
RESET
TO-220
5 Lead
(Figure 2).
5
1
2
3
4
Circuit
Short
LEAD SYMBOL
Package Lead Description
V
V
Gnd
V
NC
ENABLE
RESET
OUT
IN
OUT
Circuit Description
Sense
3
Figure 2. Circuit Waveform
The
and OFF. When the voltage on the
1.4V typ, the output pass transistor turns off, leaving a
high impedance facing the load. The IC will remain in
Sleep mode, drawing only 50µA, until the voltage on this
input drops below the
A
ers up until V
voltage, or when V
lower than 300mV below the regulated output voltage. A
hysteresis of 50mV is included in the function to minimize
oscillations.
The
controlled by a low voltage detection circuit. The circuit is
functionally independent of the rest of the IC thereby
guaranteeing that the
as 1V.
ENABLE
Input voltage.
5V, ±2%, 100mA output.
Logic level switches output off when toggled HIGH.
Ground. All Gnd leads must be connected to Ground.
Active reset (accurate to V
Kelvin connection which allows remote sensing of out-
put voltage for improved regulation. If remote sensing
is not required, connect to V
No Connection.
RESET
RESET
V
OUT
ENABLE
RESET
V
IN
signal (low voltage) is generated as the IC pow-
output is an open collector NPN transistor,
V
V
V
RL
OUT
IN
RH
function switches the output transistor ON
H
VR
PEAK
is within 250mV of the regulated output
OUT
FUNCTION
ENABLE
RESET
RESET
ENABLE
(1) = NO RESET DELAY CAPACITOR
(2) = WITH RESET DELAY CAPACITOR
drops out of regulation,and is
FOR 7V < V
(1)
VR
OUT
LO
OUT
Function
signal is valid for V
Function
(2)
³ 1V).
.
threshold.
IN
< 26V
ENABLE
lead exceeds
OUT
VR
as low
PEAK