Cherry Semiconductor CS8129YTVA5, CS8129YTHA5, CS8129YT5, CS8129YDWR16, CS8129YDW16 Datasheet
1
5V, 750mA Low Dropout Linear
Regulator with Lower RESET Threshold
Features
■ 5V +/- 3% Regulated
Output
■ Low Dropout Voltage
(0.6V @ 0.5A)
■ 750mA Output Current
Capability
■ Reduced Threshold
for use with 4V Microprocessors
■ Externally Programmed
Delay
■ Fault Protection
Reverse Battery
60V, -50V Peak Transient
Voltage
Short Circuit
Thermal Shutdown
RESET
RESET
Package Options
5 Lead TO-220
CS8129
V
IN
NC
NC
Gnd
Gnd
NC
Delay
RESET
V
OUT
NC
V
OUT(SENSE)
Gnd
Gnd
Gnd
NC
NC
Description
The CS8129 is a precision 5V linear regulator capable of sourcing 750mA.
The threshold voltage has been
lowered to 4.2V so that the regulator
can be used with 4V microprocessors.
The lower threshold also permits operation under low battery conditions (5.5V plus a diode). The Õs
delay time is externally programmed
using a discrete RC network. During
power up, or when the output goes out
of regulation, 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 CS8129 is packaged in a 5 lead
TOÐ220 and a 16 lead surface mount
package.
RESET
RESET
RESET
RESET
RESET
Block Diagram
CS8129
1V
IN
2
3 Gnd
4 Delay
5V
OUT
RESET
1
16 Lead SOIC Wide
A Company
¨
Rev. 3/31/99
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
Pre-
Regulator
Charge
Current
Generator
Regulated Supply
for Circuit Bias
Bandgap
Reference
Thermal
Shutdown
Over Voltage
Shutdown
Error
Amplifier
-
+
Anti-Saturation
and
Current Limit
V
V
V
IN
OUT
OUT
SENSE
1
Delay
Gnd
Latching Discharge
QRS
-
+
VDISCHARGE
-
+
Delay Comparator
+
-
RESET
* To observe safe operating junction temperatures, low duty cycle pulse testing is used in tests where applicable.
Delay Time = = C
Delay
x 3.5 x 105(typ)
Note 1: assuming ideal capacitor
C
Delay
x V
Delay Threshold Charge
I
Charge
Electrical Characteristics: -40ûC ² T
A
² + 125ûC, -40ûC ² TJ ² +150ûC, 6V ² V
IN
² 26V, 5mA ² I
OUT
² 500mA, R = 4.7k½ to V
OUT
unless otherwise noted*
RESET
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
Absolute Maximum Ratings
Input Operating Range..................................................................................................................................................-0.5 to 26V
Power Dissipation.............................................................................................................................................Internally Limited
Peak Transient Voltage (46V Load Dump @ 14V VIN) ...............................................................................................-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
Reflow (SMD styles only) ......................................................................................60 sec. max above 183¡C, 230¡C peak
CS8129
2
■ Output Stage (V
OUT
)
Output Voltage 4.85 5.00 5.15 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
Reverse Polarity Input V
OUT
³ -0.6V, 10½ Load -15 -30 V
Voltage DC
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)
4.05 4.35 4.50 V
V
OUT
Decreasing, V
RT(OFF)
4.00 4.20 4.45 V
Hysteresis VRH=V
RT(ON)
- V
RT(OFF)
50 150 250 mV
Delay Threshold Charge, V
DC(HI)
3.25 3.50 3.75 V
Discharge, V
DC(LO)
2.85 3.10 3.35 V
Delay Hysteresis 200 400 800 mV
Output Voltage Low1V < 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 (Note 1) 16 32 48 ms
RESET
RESET
RESET
RESET
RESET
3
Typical Performance Characteristics
0.0
0.0
I
CQ
(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.
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
= 25W
125ûC
25ûC
-40ûC
Output Voltage vs Input Voltage over Temperature
Quiescent Current vs Input Voltage over Load Resistance
Quiescent Current vs Input Voltage over Temperature
V
OUT
vs. VINover R
LOAD
Package Lead Description
PACKAGE LEAD # LEAD SYMBOL FUNCTION
CS8129
-100
0
LINE REGULATION (mV)
OUTPUT CURRENT (mA)
-80
-60
-40
-20
0
20
40
60
80
100
100 200 300 400 500 600 700 800
VIN 6-26V
TEMP = 25ûC
TEMP = -40ûC
TEMP = 125ûC
Load Regulation vs. Output Current
Line Regulation vs. Output Current
R
load
=25½
16L SOIC Wide 5L TO-220
11VINUnregulated supply voltage to IC.
16 5 V
OUT
Regulated 5V output.
4, 5, 11, 12, 13 3 Gnd Ground connection.
8 4 Delay Timing capacitor for function.
6 2 CMOS/TTL compatible output lead. goes low whenev-
er V
OUT
drops below 6% of it's regulated value.
14 N/A V
OUT(SENSE)
Remote sensing of output voltage.
RESETRESET
RESET
55.0
R
= 25W
50.0
45.0
40.0
35.0
30.0
(mA)
25.0
CQ
I
20.0
15.0
10.0
5.0
0.0
load
25ûC
125ûC
-40ûC
0.0
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
VIN (V)
5.5
Room Temp.
5.0
4.5
(V)
OUT
V
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
Rload =
NO LOAD
Rload = 10W
Rload = 6.67W
0.0
1.0 2.0 3.0 4.0 5.0 6.0 7.0 8.0 9.0 10.0
0.0
VIN (V)
6
4
2
0
-2
-4
-6
-8
LOAD REGULATION (mV)
-10
-12
-14
100 200 300 400 500 600 700 800
0
TEMP = -40ûC
TEMP = 25ûC
VIN = 14V
TEMP = 125ûC
OUTPUT CURRENT (mA)
Loading...