LR478L-25-S08-R [UTC]
REGULATORRESET IC;型号: | LR478L-25-S08-R |
厂家: | Unisonic Technologies |
描述: | REGULATORRESET IC |
文件: | 总8页 (文件大小:240K) |
中文: | 中文翻译 | 下载: | 下载PDF数据表文档文件 |
UNISONIC TECHNOLOGIES CO., LTD
LR478
LINEAR INTEGRATED CIRCUIT
REGULATOR+RESET IC
DESCRIPTION
The UTC LR478 developed for use in CD-ROM drives,
combines a 3V regulator adapted to low power consumption with
a much-sought reset function (regulator input monitoring),with
internal delay circuit, set to detect 4.2V.
FEATURES
*Large Output Current: 300mA (max.)
*High Ripple Rejection Rate: 80dB(typ.)
*Internal Thermal Shutdown Circuit
*Internal Current Limiting Circuit
*Easy Set Delay Time from Voltage Detection to Reset Release
ORDERING INFORMATION
Order Number
Package
Packing
Lead Free
Halogen Free
LR478G-xx-S08-T
LR478G-xx-S08-R
LR478L-xx-S08-T
LR478L-xx-S08-R
SOP-8
SOP-8
Tube
Tape Reel
Note: XX: Output Voltage, refer to Marking Information.
OUTPUT DETECTION VOLTAGE RANK LIST
PART NUMBER
LR478-3.4V
LR478-3.3V
LR478-2.5V
REGULATOR OUTPUT VOLTAGE (V)
DETECTION VOLTAGE (V)
4.20±0.09
3.40±0.05
3.30±0.05
2.50±0.05
4.20±0.09
4.20±0.09
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
MARKING
25: 2.5V
33: 3.3V
34: 3.4V
SOP-8
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LR478
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
N.C
Cd
1
8
RESET
GND
N.C
2
3
7
6
CONT
VIN
VOUT
5
4
PIN DESCRIPTION
PIN NO.
PIN NAME
N.C
FUNCTIONS
EQUIVALENT CIRCUIT DIAGRAM
RESET
1
Input voltage detection output
Input voltage detection output pin
RESET pin logic
RESET
2
RESET
VIN<VS
VIN>VS
L
H
CONT
300K
Output voltage on/off-control pin
VCONT
Output
OFF
ON
L
3
CONT
H
400K
Connect cont-terminal with VIN when it
is not used.
4
5
6
7
VIN
Voltage supply input pin
Regulator Output pin
VOUT
N.C
GND
GND pin
Delay time capacitor pin
RESET pin output delay time can be
set by the capacitance connected to
the Cd pin.
VOUT
Cd
-
+
8
Cd
t
t
PLH=100000.C
PLH: transmission delay time[s]
C: capacitor value [F]
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LR478
LINEAR INTEGRATED CIRCUIT
BLACK DIAGRAM
4
VIN
5
VOUT
-
+
-
+
Thermal
Protect
CONT
3
+
-
-
2
RESET
+
7
8
GND
Cd
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LR478
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
PARAMETER
SYMBOL
VIN
RATINGS
-0.3 ~ +10
400
UNIT
V
Supply Voltage
Output Current
IOUT
mA
mW
C
C
C
Power Dissipation(note3)
Junction Temperature
Operating Temperature
Storage Temperature
PD
700
TJ
+125
TOPR
TSTG
-40 ~ +85
-40~+150
Note 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2. The device is guaranteed to meet performance specification within 0℃ ~ +70℃ operating temperature range
and assured by design from –20℃ ~ +85℃.
RECOMMENDED OPERATION CONDITIONS
PARAMETER
SYMBOL
VOPR
RATINGS
0 ~ 10
UNIT
V
Operating Voltage
Output Current
IOUT
0 ~ 300
mA
ELECTRICAL CHARACTERISTICS(VCONT =1.6V, Ta=25C, unless otherwise specified )
PARAMETER
SYMBOL
IQ1
TEST CONDITIONS
VIN=5V, IOUT=0mA
MIN
TYP
3
MAX UNIT
No-load Input Current 1
No-load Input Current 2
Input Current (OFF)
Regulator
8
mA
mA
μA
IQ2
VIN=4V, IOUT=0mA
4
IQ3
VIN=5V, VCONT=0.4V
250
Output Voltage
VOUT
VIN=5V, IOUT=30mA
3.33
3.40
0.15
10
3.47
0.3
V
V
Input-Output Different Voltage
Line Regulation
VI/O(DIFF) VIN=3.2V, IOUT=150mA
∆VOUT
∆VOUT
VIN=4.4~5.5V, IOUT=30mA
VIN=5V, IOUT=0~300mA
20
mV
Load Regulation
20
120
mV
VOUT Temperature Coefficient
∆VOUT/∆T VIN=5V, IOUT=30mA, TJ= -20~85C
100
ppm/C
VIN=5V, IOUT=30mA, f=120Hz
Ripple Rejection
RR
50
80
dB
VRIPPLE=1VP-P
Output Noise Voltage
CONT Terminal Current
High Threshold Voltage
Low Threshold Voltage
Reset
VIN
VIN=5V, IOUT=30mA, f=20~80kHz
VCONT=1.6V
40
5
120 μVrms
ICONT
10
VIN+0.3
0.4
μA
V
VTHR(H)
VTHR(L)
1.6
-0.3
V
Detection Voltage
VS
VIN= VTHR(H)→VTHR(L)
4.11
100
4.20
100
4.29
V
ppm/C
mV
mV
μA
Vs Temperature Coefficient
Hysteresis Voltage
∆VS/∆T TJ= -20~85C
VHYS
VOL
VIN= VTHR(H)→VTHR(L)→VTHR(H)
200
200
±0.1
Low-Level Output Voltage
Output Leakage Current
Output Current 1
VIN=3.9V, RL=4.7K
VIN=5V
100
ILEAK
IOUT
IOUT
1
2
VIN=3.9V, RL=0
5
3
mA
mA
μs
Output Current 2
VIN=3.9V, RL=0, Ta= -20~85C
Cd =0.0μF
“H” Transmission Delay Time
Reset Delay Time
tPLH
tPLH
tPLH
VTHR(OPR) VoL=0.4V
30
10
90
20
1
VIN=4V→5V, Cd =0.1μF
5
ms
“L” Transmission Delay Time
Threshold Operating Voltage
30
90
μs
0.65
0.85
V
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LR478
LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT
VIN
VOUT
A
4
2
5
A
1µF
4.7kO
+
UTC LR478
7
47µF
Cd
8
V
3
6
RESET
0.1µF
GND
CONT
TYPICAL APPLICATION CIRCUIT
VIN
4
VOUT
5
1µF
COUT
47µF
+
UTC LR478
7
4.7kO
2
Cd
8
3
6
RESET
0.1µF
GND
CONT
Note: External output-capacitor(COUT) for stability is necessary due to without internally compensated.
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LR478
LINEAR INTEGRATED CIRCUIT
TIMING CHART
VIN
? Vs
5V
VS
0V
H
CONT
L
VOUT
5V
0V
5V
tPLH1
RESET
0V
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LR478
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
Detection Voltage
IOUT =0mA
Output Volttage vs Temperature
3.5
3.48
3.46
5
4
3.44
3.42
VOUT
3
3.4
3.38
3.36
2
1
RESET
3.34
3.32
3.3
0
0
25
50
75
-25
0
100 125
2
3
4
1
5
Temperature (°C)
Input Voltage (V)
Line Regulation
Load Regulation
30
20
15
10
5
20
10
0
0
-5
-10
-10
-20
-30
-15
-20
100 150
200
6
7
8
0
50
250 300
4
5
9
10
Input Voltage (V)
Output Current (mA)
Ripple Rejection
Detecting Volttage vs Temperature
100
90
4.3
4.28
4.26
80
70
60
4.24
4.22
50
40
30
4.2
4.18
4.16
20
4.14
4.12
4.1
10
0
10
25
50
Temperature (°C)
75
100
1000
10000
100000
-25
0
100
125
Frequency (Hz)
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LR478
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS(Cont.)
Allowable Loss
1000
800
On board 25×40×1mm
600
400
200
0
0
50
75
100
25
125
Temperature (°C)
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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