Cherry Semiconductor CS8122YTVA5, CS8122YTHA5, CS8122YT5 Datasheet
The CS8122 is a precision 5V linear regulator capable of sourcing in excess of
750mA. The Õs delay time is
externally programmed using a discrete
RC network. During power up, or when
the output goes out of regulation, the
lead remains in the low state
for the duration of the delay. This function is independent of the input voltage
and will function correctly as long as
the output voltage remains at or above
1V. Hysteresis is included in the Delay
and the comparators to
improve noise immunity. A latching
discharge circuit is used to discharge
the delay capacitor when it is triggered
by a brief fault condition.
The regulator is protected against a
variety of fault conditions: i.e. reverse
battery, overvoltage, short circuit and
thermal runaway conditions. The regulator is protected against voltage transients ranging from -50V to +40V. Short
circuit current is limited to 1.2A (typ).
The CS8122 is an improved replacement
for the CS8126 and features a tighter tolerance on its output voltage (2% vs 4%).
The CS8122 is packaged in a 5 lead
TOÐ220 with copper tab. The copper tab
can be connected to a heat sink if
necessary.
RESET
RESET
RESET
1
2% 5V, 750mA Low Dropout Linear
Regulator with Delayed RESET
Features
■ 5V +/- 2% Regulated
Output
■ Low Dropout Voltage
(0.6V @ 0.5A)
■ 750mA Output Current
Capability
■ Externally Programmed
Delay
■ Fault Protection
Reverse Battery
60V Load Dump
-50V Reverse Transient
Short Circuit
Thermal Shutdown
RESET
Package Options
5 Lead TO-220
CS8122
Description
Block Diagram
CS8122
1V
IN
2V
OUT
3 Gnd
4 Delay
5 RESET
1
A Company
¨
Rev. 2/5/99
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
Charge
Current
Generator
Regulated Supply
for Circuit Bias
Bandgap
Reference
Thermal
Shutdown
Pre-
Regulator
Over Voltage
Shutdown
Error Amplifier
-
+
Anti-Saturation
and
Current Limit
V
IN
V
OUT
V
OUT
SENSE
Delay
Gnd
Latching Discharge
QRS
-
+
VDISC
-
+
Delay Comparator
+
-
RESET
2
Electrical Characteristics: -40ûC ² TA ² +125ûC, -40ûC ² TJ ² +150ûC, 6V ² V
IN
² 26V, 5mA ² I
OUT
² 500mA,
R = 4.7k½ to VCCunless otherwise noted*
RESET
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Absolute Maximum Ratings
Input Operating Range..................................................................................................................................................-0.5 to 26V
Power Dissipation.............................................................................................................................................Internally Limited
Transient Input Voltage .................................................................................................................................................-50V, 60V
Output Current .................................................................................................................................................Internally Limited
ESD Susceptibility (Human Body Model)..............................................................................................................................4kV
Junction Temperature.............................................................................................................................................-55¡C to 150¡C
Storage Temperature...............................................................................................................................................-55¡C to 150¡C
Lead Temperature Soldering
Wave Solder (through hole styles only) .....................................................................................10 sec. max, 260¡C peak
CS8122
* To observe safe operating junction temperatures, low duty cycle pulse testing is used in tests where applicable.
Delay Time =
C
Delay
x V
Delay Threshold Charge
= C
Delay
x 3.5 x 105 (typ)
I
Charge
■ Output Stage (V
OUT
)
Output Voltage 4.9 5.0 5.1 V
Dropout Voltage I
OUT
= 500mA 0.35 0.60 V
Supply Current I
OUT
² 10mA 2 7 mA
I
OUT
² 100mA 6 12
I
OUT
² 500mA 55 100
Line Regulation 6V ² V
IN
² 26V, I
OUT
= 50mA 5 50 mV
Load Regulation 50mA ² I
OUT
² 500mA, VIN= 14V 10 50 mV
Ripple Rejection f = 120Hz, VIN= 7 to 17V, 54 75 dB
I
OUT
= 250mA
Current Limit 0.75 1.20 A
Overvoltage Shutdown 32 40 V
Maximum Line Transient V
OUT
² 5.5V 60 95 V
Reverse Polarity Input V
OUT
³ -0.6V, 10½ Load -15 -30 V
Voltage DC
Reverse Polarity Input 1% Duty Cycle, T < 100ms, -50 -80 V
Voltage Transient 10½ Load
Thermal Shutdown Guaranteed by Design 150 180 210 ¡C
■ and Delay Functions
Delay Charge Current V
DELAY
= 2V 5 10 15 µA
Threshold V
OUT
Increasing, V
RT(ON)
4.65 4.90 V
OUT
-0.01 V
V
OUT
Decreasing, V
RT(OFF)
4.50 4.70 V
OUT
-0.16 V
Hysteresis V
RH
= V
RT(ON)
- V
RT(OFF)
150 200 250 mV
Delay Threshold Charge, V
DC(HI)
3.25 3.50 3.75 V
Discharge, V
DC(L)
2.85 3.10 3.35 V
Delay Hysteresis 200 400 800 mV
Output Voltage Low 1V < V
OUT
< V
RT(L)
, 3k½ to V
OUT
0.1 0.4 V
Output Leakage V
OUT
> V
RT(H)
010µA
Current
Delay Capacitor Discharge Latched ÒONÓ, 0.2 0.5 V
Discharge Voltage V
OUT
> V
RT
Delay Time C
DELAY
= 0.1µF 16 32 48 ms
RESET
RESET
RESET
RESET
RESET
3
Typical Performance Characteristics
0.0
0.0
Quiescent Current
(mA)
VIN (V)
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
5.0
10.0
15.0
20.0
25.0
30.0
35.0
40.0
45.0
50.0
55.0
125ûC
25ûC
-40ûC
R
load
= 25W
0.0
0.0
Quiescent Current
(mA)
VIN (V)
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
20.0
40.0
60.0
80.0
100.0
120.0
R
load
= 6.67W
R
load
= 10W
R
load
= 25W
R
load
= NO LOAD
Room Temp.
Output Voltage vs Input Voltage over Temperature
Quiescent Current vs Input Voltage over Load Resistance
Quiescent Current vs Input Voltage over Temperature
0.0
0.0
V
OUT
(V)
VIN (V)
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
R
load
=
NO LOAD
R
load
= 6.67W
R
load
= 10W
Room Temp.
V
OUT
vs. VINover R
LOAD
Package Lead Description
PACKAGE LEAD # LEAD SYMBOL FUNCTION
CS8122
R
load
=25½
5Lead TO-220
1V
IN
Unregulated supply voltage to IC.
2V
OUT
Regulated 5V output.
3 Gnd Ground connection.
4 Delay Timing capacitor for function.
5 CMOS/TTL compatible output lead. goes low whenev-
er V
OUT
drops below 6% of it's regulated value.
RESET
RESET
RESET
R
= 25W
5.5
load
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-40ûC
VIN (V)
125ûC
25ûC
0.0
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
(V)
OUT
V
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