UTC-IC LR478-3.3V

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
SOP-8
*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
*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
Packing
SOP-8
SOP-8
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)
3.40±0.05
3.30±0.05
2.50±0.05
www.unisonic.com.tw
Copyright © 2005 Unisonic Technologies Co., LTD
DETECTION VOLTAGE (V)
4.20±0.09
4.20±0.09
4.20±0.09
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QW-R112-001,B
LR478
LINEAR INTEGRATED CIRCUIT
PIN CONFIGURATION
N.C
1
8
Cd
RESET
2
7
GND
CONT
3
6
N.C
VIN
4
5
VOUT
PIN DESCRIPTION
PIN NO.
1
PIN NAME
N.C
FUNCTIONS
EQUIVALENT CIRCUIT DIAGRAM
Input voltage detection output
Input voltage detection output pin
RESET pin logic
2
RESET
RESET
VIN<VS
L
VIN>VS
H
Output voltage on/off-control pin
VCONT
3
RESET
L
H
CONT
Output
OFF
ON
CONT
300K
400K
8
VIN
VOUT
N.C
GND
Cd
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]
UNISONIC TECHNOLOGIES CO., LTD
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V OUT
Cd
+
-
4
5
6
7
Connect cont-terminal with VIN when it
is not used.
Voltage supply input pin
Regulator Output pin
2 of 8
QW-R112-001,B
LR478
LINEAR INTEGRATED CIRCUIT
BLACK DIAGRAM
4
VIN
5
VOUT
+
CONT
+
Thermal
Protect
3
+
+
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 RESET
7
GND
8
Cd
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QW-R112-001,B
LR478
LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATINGS
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
SYMBOL
VOPR
IOUT
Operating Voltage
Output Current
RATINGS
0 ~ 10
0 ~ 300
UNIT
V
mA
ELECTRICAL CHARACTERISTICS(VCONT =1.6V, Ta=25°C, 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
MIN
TYP
3
4
250
MAX
8
UNIT
mA
mA
µA
VOUT
VI/O(DIFF)
∆VOUT
∆VOUT
∆VOUT/∆T
3.33
3.40
0.15
10
20
100
3.47
0.3
20
120
V
V
mV
mV
ppm/°C
50
80
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= -20~85°C
VIN=5V, IOUT=30mA, f=120Hz
VRIPPLE=1VP-P
VIN=5V, IOUT=30mA, f=20~80kHz
VCONT=1.6V
1.6
-0.3
VIN= VTHR(H)→VTHR(L)
TJ= -20~85°C
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= -20~85°C
Cd =0.0µF
VIN=4V→5V, Cd =0.1µF
VoL=0.4V
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
40
5
4.11
4.20
100
100
dB
120 µVrms
10
µA
VIN+0.3
V
0.4
V
4.29
100
200
200
±0.1
30
10
30
0.65
90
20
90
0.85
5
3
5
V
ppm/°C
mV
mV
µA
mA
mA
µs
ms
µs
V
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QW-R112-001,B
LR478
LINEAR INTEGRATED CIRCUIT
TEST CIRCUIT
VIN
A
4
VOUT
5
A
1μF
UTC LR478
+
4.7kΩ
2
Cd
8
3
RESET
7
6
47μF
V
0.1μF
GND
CONT
TYPICAL APPLICATION CIRCUIT
VIN
4
5
VOUT
1μF
UTC LR478
+
4.7kΩ
2
RESET
8
3
7
6
COUT
47μF
Cd
0.1μF
GND
CONT
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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QW-R112-001,B
LR478
LINEAR INTEGRATED CIRCUIT
TIMING CHART
V IN
5V
ΔVs
VS
OV
CONT
H
L
V OUT
5V
OV
tPLH 1
RESET
5V
OV
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www.unisonic.com.tw
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QW-R112-001,B
LR478
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS
Detection Voltage
Output Volttage vs Temperature
IOUT =0mA
4
Output Voltage (V)
Output Voltage (V)
5
VOUT
3
2
RESET
1
0
0
1
2
3
Input Voltage (V)
4
5
Line Regulation
Load Regulation (mV)
Line Regulation (mV)
15
10
5
0
-5
-10
-15
7
8
9
3.34
3.32
3.3
-25
0
25
50
75
Temperature (℃)
100
125
250
300
Load Regulation
20
10
0
-10
-20
0
50
100
150
200
Input Voltage (V)
Output Current (mA)
Ripple Rejection
Detecting Volttage vs Temperature
100
90
80
70
60
50
40
30
20
10
0
10
3.4
3.38
3.36
-30
10
Output Voltage (V)
Ripple Rejection (dB)
6
5
3.44
3.42
30
20
-20
4
3.5
3.48
3.46
100
1000
10000
100000
Frequency (Hz)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4.3
4.28
4.26
4.24
4.22
4.2
4.18
4.16
4.14
4.12
4.1
-25
0
25
50
75
100
125
Temperature (℃)
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QW-R112-001,B
LR478
LINEAR INTEGRATED CIRCUIT
TYPICAL CHARACTERISTICS(Cont.)
Allowable Loss
1000
Allowable loss (mV)
On board 25*40*1mm
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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QW-R112-001,B