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LR478_13 [UTC]

REGULATORRESET IC;
LR478_13
型号： LR478_13
厂家： Unisonic Technologies    Unisonic Technologies
描述：

REGULATORRESET IC
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中文：  中文翻译
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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  
www.unisonic.com.tw  
1 of 8  
Copyright © 2013 Unisonic Technologies Co., LTD  
QW-R119-003.C  
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]  
UNISONIC TECHNOLOGIES CO., LTD  
2 of 8  
QW-R119-003.C  
www.unisonic.com.tw  
LR478  
LINEAR INTEGRATED CIRCUIT  
BLACK DIAGRAM  
4
VIN  
5
VOUT  
-
+
-
+
Thermal  
Protect  
CONT  
3
+
-
-
2
RESET  
+
7
8
GND  
Cd  
UNISONIC TECHNOLOGIES CO., LTD  
3 of 8  
QW-R119-003.C  
www.unisonic.com.tw  
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
UNISONIC TECHNOLOGIES CO., LTD  
4 of 8  
QW-R119-003.C  
www.unisonic.com.tw  
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.  
UNISONIC TECHNOLOGIES CO., LTD  
5 of 8  
QW-R119-003.C  
www.unisonic.com.tw  
LR478  
LINEAR INTEGRATED CIRCUIT  
TIMING CHART  
VIN  
? Vs  
5V  
VS  
0V  
H
CONT  
L
VOUT  
5V  
0V  
5V  
tPLH1  
RESET  
0V  
UNISONIC TECHNOLOGIES CO., LTD  
6 of 8  
QW-R119-003.C  
www.unisonic.com.tw  
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)  
UNISONIC TECHNOLOGIES CO., LTD  
7 of 8  
QW-R119-003.C  
www.unisonic.com.tw  
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.  
UNISONIC TECHNOLOGIES CO., LTD  
8 of 8  
QW-R119-003.C  
www.unisonic.com.tw  

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