LX8819 データシートの表示（PDF） - Microsemi Corporation
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LX8819 Datasheet PDF : 9 Pages
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LX8819
TM
®
Dual Channel 1A Low Dropout Regulator
DATA SHEET
RECOMMENDED OPERATING CONDITIONS
Parameter
Symbol
LX8819
Units
Min Typ Max
Input Voltage - 3.3V
VIN
4.5
10
V
Input Voltage - 2.5V < 200mA Load
3.5
10
V
Output Voltage (Adjustable)
Load Current (Each Output)1
Input Capacitor (VIN to GND)
Output Capacitor (VOUTx to GND)2
VOUT
IOUT
CIN
COUT
5
V
0
1000 mA
2.2 20
µF
1.0 10
µF
Note 1: Care should be taken so as to not exceed the thermal dissipation capability of the package
2: Size your output capacitor to meet the transient loading requirement. If you have a very dynamic load, a lower ESR and larger value
capacitor will improve the response to these load steps.
ELECTRICAL CHARACTERISTICS
Unless otherwise specified, the following specifications apply over the operating ambient temperature 0°C ≤ TA ≤ 125°C except where
otherwise noted and with the following test conditions: VIN = 5V, IOUT = 10mA, CIN= 10µF (Tantalum), COUT = 4.7µF (Tant.), and TJ = TA
using low duty cycling methods.
Parameter
` ADJUSTABLE OUTPUT (VOUT1)
Reference Voltage
Line Regulation
Load Regulation
Dropout Voltage
Current Limit
Minimum Load Current
Adjust Pin Bias Current
` FIXED OUTPUT (OUTPUT 2)
Symbol
Test Conditions
VREF 5mA < IOUT1 < 1A, 4.75V < VIN < 5.5V
∆VREF(VIN) 3.75V < VIN < 5.5V, IOUT1 = 5mA
∆VREF(IOUT) 5mA < IOUT1 < 1A, VIN = 4.75V
∆V
IOUT1 = 1A, ∆V1 = -1%
IOUT (MAX)
IL
Note 3
IADJ
LX8819
Units
Min Typ Max
1.225
1.0
1.25
1.5
0.18
1.3
1.4
2
-0.12
1.275 V
6
mV
0.36 %VOUT
1.46 V
A
3
mA
-1
µA
Output Voltage – LX8819-33
Output Voltage – LX8819-25
Line Regulation
Load Regulation
Dropout Voltage
Current Limit
Minimum Load Current
` ENTIRE REGULATOR
VOUT
5mA < IOUT2 < 1A, 4.75V < VIN < 5.5V
5mA < IOUT2 < 0.2A, 3.75V < VIN < 5.5V
∆VOUT(VIN) 4.75V < VIN < 5.5V, IOUT2 = 5mA
∆VOUT(IOUT) 5mA < IOUT2 < 1A, VIN = 4.75V
∆V
IOUT2 = 1A, ∆V2 = -1%
IOUT2 = 0.2A, ∆V2 = -1%
IOUT (MAX)
IOUT
3.217 3.30 3.383
V
2.437 2.5 2.562
6
8
mV
6
12 mV
1.25 1.41 V
1.25 V
1.0 1.4
A
0
mA
Quiescent Current
IQ
VIN < 5.5V, IOUT1 = 5mA, IOUT2 = 5mA
VIN < 5.5V, IOUT1 = 1A, IOUT2 = 1A
2.6 4.2
mA
3.5
5
VIN Under Voltage Lockout
Threshold
UVLO
-3.3 Voltage Rising
-2.5 Voltage Rising @ 25 °C
2.5
2.5
4.5
3.6
V
VOUT Rise Time for VIN
Switched On
VOUT(tR)
80
300 µs
Ripple Rejection
PSRR f=120Hz, VIN = 5V
60
75
dB
RMS Output Noise
VOUT (RMS) 10Hz < f < 10kHz
0.003
%VOUT
Thermal Shutdown
TJSD
150 165
°C
Note 3: Minimum load current is defined as the amount of output current required to maintain regulation. , The external resistor divider current can be
included in this requirement.
Copyright © 2003
Revision 1.0a, 4/29/2005
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
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