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SI-3002KWF 1 A, Low-Dropout, Dual Output, 2.5 V & 3.3 V Regulator
FUNCTIONAL BLOCK DIAGRAM
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Allowable Package Power Dissipation
Recommended Operating Conditions
Min 0 -30 -20 Max 1 +85 +100 Units A C C
DC Output Current Operating Ambient Temp. Operating Junction Temp.
For the availability of parts meeting -40C requirements, contact Allegro's Sales Representative.
This data sheet is based on Sanken data sheet SSJ-02006.
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 Copyright (c) 2004, 2005 Allegro MicroSystems, Inc.
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SI-3002KWF 1 A, Low-Dropout, Dual Output, 2.5 V & 3.3 V Regulator
ELECTRICAL CHARACTERISTICS at TA = +25C, VE = 2 V (unless otherwise noted).
Limits Characteristic Channel 1 Output Voltage VO1 VO1(off) Output Volt. Temp. Coeff. Output Short-Circuit Current Line Regulation Load Regulation Dropout Voltage Ripple Rejection Ratio Channel 2 Output Voltage VO2 VO2(off) Output Volt. Temp. Coeff. Output Short-Circuit Current Line Regulation Load Regulation Dropout Voltage Ripple Rejection Ratio Logic Ground Terminal Current IGND VI = 5.0 V, IO = 0 mA, VE = 2.0 V VI = 5.0 V, VE = 0 V Enable Input Voltage VEH VEL Enable Input Current IEH IEL Thermal Shutdown TJ Output ON Output OFF VE = 2.7 V VE = 0.4 V IO = 10 mA -- -- 2.0 -- -- -- 135 1.0 -- -- -- 0 -12 150 1.5 0.5 -- 0.8 5.0 -100 -- mA mA V V A A C VI = 5.0 V, IO2 = 10 mA VE = 0 V 0C TJ 100C VI = 5.0 V, See note VI = 4.5 V ~ 10 V, IO2 = 10 mA VI = 5.0 V, IO2 = 0 A ~ 1.0 A IO2 = 1.0 A VI = 5.0 V, 100 Hz f 120 Hz 2.450 -- -- 1.2 -- -- -- -- 2.500 2.550 -- 0.3 -- -- -- -- 60 0.5 -- -- 20 30 0.6 -- V V mV/C A mV mV V dB VI = 5.0 V, IO1 = 10 mA VE = 0 V 0C TJ 100C VI = 5.0 V, See note VI = 4.5 V ~ 10 V, IO1 = 10 mA VI = 5.0 V, IO1 = 0 A ~ 1.0 A IO1 = 1.0 A VI = 5.0 V, 100 Hz f 120 Hz 3.234 -- -- 1.2 -- -- -- -- 3.300 3.366 -- 0.3 -- -- -- -- 60 0.5 -- -- 20 30 0.6 -- V V mV/C A mV mV V dB Symbol Test Conditions Min. Typ. Max. Units
aVO1
IOM1 VO(VI)1 VO(IO)1 VImin - VO1 PSRR
aVO2
IOM2 VO(VI)2 VO(IO)2 VImin - VO2 PSRR
Typical values are given for circuit design information only. Note: Output short-circuit current is at point where output voltage has decreased 5%.
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SI-3002KWF 1 A, Low-Dropout, Dual Output, 2.5 V & 3.3 V Regulator
TYPICAL CHARACTERISTICS
(VI = 5.0 V, TA = 25C) Chan. 1 Dropout Voltage Chan. 1 Low-Voltage Behavior
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Chan. 1 Overcurrent Protection
Chan. 1 Line Regulation
Chan. 1 Load Regulation
Chan. 1 Transient Response
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115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036
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(VI = 5.0 V, TA = 25C) Chan. 2 Low-Voltage Behavior
SI-3002KWF 1 A, Low-Dropout, Dual Output, 2.5 V & 3.3 V Regulator
TYPICAL CHARACTERISTICS (cont.)
Chan. 2 Overcurrent Protection
Chan. 2 Line Regulation
Chan. 2 Load Regulation
Chan. 2 Transient Response
ENABLE Control Voltage
ENABLE Control Current
Thermal Protection
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SI-3002KWF 1 A, Low-Dropout, Dual Output, 2.5 V & 3.3 V Regulator
APPLICATIONS INFORMATION
Input Capacitor (CI, 0.1 10 F). This is necessary either when the input line includes inductance or when the wiring is long. Output Capacitor (CO, >22 F). This device is not designed for a use with a very low ESR output capacitor such as a ceramic capacitor. Output oscillation may occur with that kind of capacitor. ENABLE Input. The ENABLE (control) input features an internal pull-up resistor. Leaving this input open causes the output to turn on. Parallel Operation. Parallel operation to increase load current is not permitted. Determination of DC Input Voltage. The minimum input voltage VI(min) should be higher than the sum of the fixed output voltage and the maximum rated dropout voltage. Overcurrent Protection. The SI-3000KWF series has a built-in fold-back type overcurrent protection circuit, which limits the output current at a start-up mode. It thus cannot be used in applications that require current at the start-up mode such as: (1) constant-current load, (2) power supply with positive and negative outputs to common load (a center-tap type power supply), or (3) raising the output voltage by putting a diode or a resistor between the device ground and system ground. Thermal Protection. Circuitry turns off the pass transistor when the junction temperature rises above 135C. It is intended only to protect the device from failures due to excessive junction temperatures and should not imply that output short circuits or continuous overloads are permitted.
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Heat Radiation and Reliability. The reliability of the IC is directly related to the junction temperature (TJ) in its operation. Accordingly, careful consideration should be given to heat dissipation. The inner frame on which the integrated circuit is mounted is connected to the GND terminal (pin 3). Therefore, it is very effective for heat radiation to enlarge the copper area that is connected to the GND terminal. The graph on page 2 illustrates the effect of thermal resistance on the allowable package power dissipation. The junction temperature (TJ) can be determined from either of the following equations: TJ = (PD x RJA) + TA or TJ = (PD x RJC) + TC where PD = IO1(VI - VO1) + IO2(VI - VO2) and RJC = 7C/W.
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115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036
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Dimensions in Millimeters
SI-3002KWF 1 A, Low-Dropout, Dual Output, 2.5 V & 3.3 V Regulator
Terminal Finish: Sn-3Ag-0.5Cu, 2nd level interconnect category (e1) Product Weight: Approx. 2.3 g Terminal spacing is measured at lead tips.
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