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UNISONIC TECHNOLOGIES CO., LTD LR478
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.
LINEAR INTEGRATED CIRCUIT
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
SOP-8
*Pb-free plating product number: LR478L
ORDERING INFORMATION
Order Number Normal Lead Free Plating LR478-xx-S08-R LR478L-xx-S08-R LR478-xx-S08-T LR478L-xx-S08-T Package SOP-8 SOP-8 Packing Tape Reel Tube
Note: xx: Output Voltage, refer to Rank List as below. OUTPUT DETECTION VOLTAGE RANK LIST
PART NUMBER LR478-3.4V LR478-3.3V LR478-2.5V REGULATOR OUTPUT VOLTAGE (V) 3.400.05 3.300.05 2.500.05 DETECTION VOLTAGE (V) 4.200.09 4.200.09 4.200.09
www.unisonic.com.tw Copyright (c) 2005 Unisonic Technologies Co., LTD
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LR478
PIN CONFIGURATION
N.C RESET CONT VIN 1 2 3 4
LINEAR INTEGRATED CIRCUIT
8 7 6 5
Cd GND N.C VOUT
PIN DESCRIPTION
PIN NO. 1 PIN NAME N.C FUNCTIONS Input voltage detection output Input voltage detection output pin RESET pin logic 2 RESET RESET VINVS H Output voltage on/off-control pin VCONT 3 CONT L H Output OFF ON EQUIVALENT CIRCUIT DIAGRAM
RESET
CONT 300K
400K
4 5 6 7
VIN VOUT N.C GND
Connect cont-terminal with VIN when it is not used. Voltage supply input pin Regulator Output pin GND pin Delay time capacitor pin RESET pin output delay time can be set by the capacitance connected to the Cd pin. tPLH=100000.C tPLH: transmission delay time[s] C: capacitor value [F]
VOUT Cd + -
8
Cd
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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BLACK DIAGRAM
LINEAR INTEGRATED CIRCUIT
4
VIN
5 +
VOUT
CONT 3
Thermal Protect + +
+
2 RESET
7 8
GND Cd
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LR478
ABSOLUTE MAXIMUM RATINGS
LINEAR INTEGRATED CIRCUIT
PARAMETER SYMBOL RATINGS UNIT Supply Voltage VIN -0.3 ~ +10 V Output Current IOUT 400 mA Power Dissipation(note3) PD 700 mW Junction Temperature TJ +125 C Operating Temperature TOPR -20 ~ +85 C Storage Temperature TSTG -40~+150 C 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 Operating Voltage Output Current SYMBOL VOPR IOUT RATINGS 0 ~ 10 0 ~ 300 UNIT V mA
ELECTRICAL CHARACTERISTICS(VCONT =1.6V, Ta=25C, unless otherwise specified )
PARAMETER No-load Input Current 1 No-load Input Current 2 Input Current (OFF) Regulator Output Voltage Input-Output Different Voltage Line Regulation Load Regulation VOUT Temperature Coefficient Ripple Rejection Output Noise Voltage CONT Terminal Current High Threshold Voltage Low Threshold Voltage Reset Detection Voltage Vs Temperature Coefficient Hysteresis Voltage Low-Level Output Voltage Output Leakage Current Output Current 1 Output Current 2 "H" Transmission Delay Time Reset Delay Time "L" Transmission Delay Time Threshold Operating Voltage SYMBOL TEST CONDITIONS IQ1 VIN=5V, IOUT=0mA IQ2 VIN=4V, IOUT=0mA IQ3 VIN=5V, VCONT=0.4V VOUT VI/O(DIFF) VOUT VOUT VOUT/T RR VIN ICONT VTHR(H) VTHR(L) VS VS/T VHYS VOL ILEAK IOUT1 IOUT2 tPLH tPLH 1 tPLH VTHR(OPR) VIN=5V, IOUT=30mA VIN=3.2V, IOUT=150mA VIN=4.4~5.5V, IOUT=30mA VIN=5V, IOUT=0~300mA VIN=5V, IOUT=30mA, TJ= -20~85C VIN=5V, IOUT=30mA, f=120Hz VRIPPLE=1VP-P VIN=5V, IOUT=30mA, f=20~80kHz VCONT=1.6V MIN TYP 3 4 250 3.40 0.15 10 20 100 80 40 5 1.6 -0.3 VIN= VTHR(H)VTHR(L) TJ= -20~85C VIN= VTHR(H)VTHR(L)VTHR(H) VIN=3.9V, RL=4.7K VIN=5V VIN=3.9V, RL=0 VIN=3.9V, RL=0, Ta= -20~85C Cd =0.0F VIN=4V5V, Cd =0.1F VoL=0.4V 4.11 100 100 5 3 5 30 10 30 0.65 90 20 90 0.85 4.20 100 MAX 8 UNIT mA mA A V V mV mV ppm/C dB 120 Vrms 10 A VIN+0.3 V 0.4 V 4.29 200 200 0.1 V ppm/C mV mV A mA mA s ms s V
3.33
3.47 0.3 20 120
50
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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LR478
TEST CIRCUIT
LINEAR INTEGRATED CIRCUIT
A 1F 4.7k
VIN
4 UTC LR478 2 3 7 GND 6
5
VOUT
A + 47 F V
8
Cd
RESET CONT
0.1 F
TYPICAL APPLICATION CIRCUIT
VIN 1F 4.7k
4 UTC LR478 2
5
VOUT COUT 47 F
8 3 7 6 GND
Cd
RESET CONT
0.1 F
Note: External output-capacitor(COUT) for stability is necessary due to without internally compensated.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
+
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LR478
TIMING CHART
LINEAR INTEGRATED CIRCUIT
VIN
5V VS
Vs
OV
CONT
H
L
VOUT
5V
OV tPLH 1
RESET
5V
OV
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www.unisonic.com.tw
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TYPICAL CHARACTERISTICS
Detection Voltage 5 Output Voltage (V) 4 3 2 1 0 0 RESET VOUT IOUT =0mA Output Voltage (V) 3.5 3.48 3.46 3.44 3.42 3.4 3.38 3.36 3.34 3.32 3.3 -25
LINEAR INTEGRATED CIRCUIT
Output Volttage vs Temperature
1
2 3 Input Voltage (V)
4
5
0
25 50 75 Temperature ( )
100
125
Line Regulation 20 15 Line Regulation (mV) 10 5 0 -5 -10 -15 -20 4 5 6 7 8 9 10 Load Regulation (mV)
30 20 10 0 -10 -20 -30 0 50
Load Regulation
100
150
200
250
300
Input Voltage (V)
Output Current (mA)
Ripple Rejection 100 90 80 70 60 50 40 30 20 10 0 10 4.3 4.28 4.26 4.24 4.22 4.2 4.18 4.16 4.14 4.12 4.1 -25
Detecting Volttage vs Temperature
Ripple Rejection (dB)
Output Voltage (V)
100
1000
10000
100000
0
25
50
75
100 )
125
Frequency (Hz)
Temperature (
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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TYPICAL CHARACTERISTICS(Cont.)
Allowable Loss
1000
LINEAR INTEGRATED CIRCUIT
On board 25*40*1mm Allowable loss (mV)
800 600 400 200 0 0 25 50 75 100 125
Temperature ( )
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
www.unisonic.com.tw
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