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SI-3120KM
1 A, Low-Dropout, 12 V Regulator
Designed to meet the high-current requirements in industrial and consumer applications; embedded core, memory, or logic supplies; TVs, VCRs, and office equipment, the SI-3120KM voltage regulator offers the reduced dropout voltage and low quiescent current essential for improved efficiency. This device delivers a regulated output at up to 1 A. Integrated thermal and overcurrent protection enhance overall system reliability. Devices with other output voltages are also available. Quiescent current does not increase significantly as the dropout voltage is approached, an ideal feature in standby/resume power systems where data integrity is crucial. Regulator accuracy and excellent temperature characteristics are provided by a bandgap reference. An LS-TTL/CMOS-compatible input gives the designer complete control over power up, standby, or power down. A pnp pass element provides a dropout voltage of less than 600 mV at 1 A of load current. Low output voltages eliminate the need for expensive PWM buck converters. The low dropout voltage permits more efficient regulation before output regulation is lost. This device is supplied in a 5-lead TO-252 style surface-mount plastic package with ground tab to provide a low-resistance path for maximum heat dissipation. FEATURES 1 A Output Current at 12 V 0.6 V Maximum Dropout Voltage at IO = 1 A Fast Transient Response 1 A Maximum Standby Current Remote Voltage Sensing Foldback Current Limiting Overvoltage Protection Ground Tab for Superior Heat Dissipation Thermal Protection APPLICATIONS TVs, VCRs, Electronic Games Embedded Core, Memory, or Logic Supplies Printers and Other Office Equipment Industrial Machinery Secondary-Side Stabilization of Multi-Output SMPS
Always order by complete part number, e.g., SI-3120KM-TL , where "-TL" indicates tape and reel.
Data Sheet 27468.90
ABSOLUTE MAXIMUM RATINGS
Input Voltage, VI . . . . . . . . . . . . . 35 V
Output Current, IO . . . . . . . . . . . . . 1 A* Enable Input Voltage, VE . . . . . . . . . VI
Junction Temperature, TJ . . . . +125C Storage Temperature Range, TS . . . . . . . . . . . . -30C to +125C * Output current rating is limited by input voltage, duty cycle, and ambient temperature. Under any set of conditions, do not exceed a junction temperature of +125C.
Sanken Power Devices from Allegro MicroSystems
SI-3120KM 1 A, Low-Dropout, 12 V Regulator
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FUNCTIONAL BLOCK DIAGRAM
Allowable Package Power Dissipation
Recommended Operating Conditions
Min -- 0 -30 -20 Max 25 1 +100 +100 Units V A C C
DC Input Voltage DC Output Current Operating Ambient Temp. Operating Junction Temp.
This data sheet is based on Sanken data sheet SSJ-02039
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 Copyright (c) 2004 Allegro MicroSystems, Inc.
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SI-3120KM 1 A, Low-Dropout, 12 V Regulator
ELECTRICAL CHARACTERISTICS at TA = +25C, VE = 2 V (unless otherwise noted).
Limits Characteristic Output Voltage Symbol VO VO(off) Output Volt. Temp. Coeff. Output Short-Circuit Current Overvoltage Protection Line Regulation Load Regulation Dropout Voltage Test Conditions VI = 14 V, IO = 10 mA VE = 0 V 0C TJ 100C VI = 14 V, See note IO = 10 mA VI = 13 V ~ 25 V, IO = 10 mA VI = 14 V, IO = 0 A ~ 1.0 A IO = 0.5 A IO = 1.0 A Ground Terminal Current IGND VI = 14 V, IO = 0 mA, VE = 2.0 V VI = 14 V, VE = 0 V Enable Input Voltage VEH VEL Enable Input Current IEH IEL Ripple Rejection Ratio Thermal Shutdown PSRR TJ Output ON Output OFF VE = 2.0 V VE = 0 V VI = 14 V, 100 Hz f 120 Hz IO = 10 mA Min. 11.76 -- -- 1.1 33 -- -- -- -- -- -- 2.0 -- -- -- -- 135 Typ. Max. Units V V mV/C A V mV mV V V A A V V A A dB C
12.00 12.24 -- 1.5 -- -- -- -- -- -- -- -- -- -- -- 0 66 150 0.5 -- -- -- 72 180 0.3 0.6 600 1.0 -- 0.8 40 -5.0 -- --
aVO
IOM VIM VO(VI) VO(IO) VImin - VO
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-3120KM 1 A, Low-Dropout, 12 V Regulator
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TYPICAL CHARACTERISTICS
(VI = 14 V, TA = 25C)
Dropout Voltage
Low-Voltage Behavior
GND Pin Current
Line Regulation
Load Regulation
Overcurrent Protection
ENABLE Control Voltage
ENABLE Control Current
Thermal Protection
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115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036
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TYPICAL CHARACTERISTICS (cont.)
(VI = 14 V, TA = 25C)
SI-3120KM 1 A, Low-Dropout, 12 V Regulator
Overvoltage Protection
GND Pin Current
APPLICATIONS INFORMATION
Input Capacitor (CI, 22 F). This is necessary either when the input line includes inductance or when the wiring is long. Output Capacitor (CO, 47 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. The recommended ESR is 0.2~2 at TA = 25C. Reverse-Bias Protection Diode (D1). Diode D1 provides reverse-bias protection between the input and output. Sanken type SFPL-52 is recommended. ENABLE Input. The ENABLE (control) input features an internal pull-down resistor. Leaving this input open causes the output to turn off. Parallel Operation. Parallel operation to increase load current is not permitted. Increased Output Voltage. The output voltage (VO) may be increased by inserting a resistor (REXT) between SENSE and OUTPUT. The current flowing into SENSE is typically 90 A 30%. To minimize the effect of ISENSE and temperature on REXT, it is recommended that a 24 k resistor be added between SENSE and GND to increase the current in REXT. The value of REXT is then 6 REXT = (VO - 12) x 10 /600
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SI-3120KM 1 A, Low-Dropout, 12 V Regulator
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APPLICATIONS INFORMATION (cont.)
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. If setting the output voltage lower than 2.0 V, the minimum input voltage should be more than 2.4 V. Overcurrent Protection. The SI-3000KM 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.
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 illustrates the effect of the copper area on the junction-toambient thermal resistance (RJA). The junction temperature (TJ) can be determined from either of the following equations: TJ = (PD x RJA) + TA or TJ = (PD x RJT) + TT where PD = IO x (VI - VO) and RJT = 6C/W.
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115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036
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Dimensions in Millimeters
Tab Temperature (TT) Measured Here
SI-3120KM 1 A, Low-Dropout, 12 V Regulator
Recommended Land Pattern
Terminal Finish: Pure Sn (category e3) Product Weight: Approx. 0.33 g 3000 pieces per reel.
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SI-3120KM 1 A, Low-Dropout, 12 V Regulator
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Tape and Reel Dimensions in Millimeters
W1: 16.4 +2/-0 mm W2: 22.4 mm Max. W3: 16.4 +3/-0.5 mm
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115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036
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SI-3120KM 1 A, Low-Dropout, 12 V Regulator
The products described herein are manufactured in Japan by Sanken Electric Co., Ltd. for sale by Allegro MicroSystems, Inc. Sanken and Allegro reserve the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Therefore, the user is cautioned to verify that the information in this publication is current before placing any order. When using the products described herein, the applicability and suitability of such products for the intended purpose shall be reviewed at the users responsibility. Although Sanken undertakes to enhance the quality and reliability of its products, the occurrence of failure and defect of semiconductor products at a certain rate is inevitable. Users of Sanken products are requested to take, at their own risk, preventative measures including safety design of the equipment or systems against any possible injury, death, fires or damages to society due to device failure or malfunction. Sanken products listed in this publication are designed and intended for use as components in general-purpose electronic equipment or apparatus (home appliances, office equipment, telecommunication equipment, measuring equipment, etc.). Their use in any application requiring radiation hardness assurance (e.g., aerospace equipment) is not supported. When considering the use of Sanken products in applications where higher reliability is required (transportation equipment and its control systems or equipment, fire- or burglar-alarm systems, various safety devices, etc.), contact a company sales representative to discuss and obtain written confirmation of your specifications. The use of Sanken products without the written consent of Sanken in applications where extremely high reliability is required (aerospace equipment, nuclear power-control stations, life-support systems, etc.) is strictly prohibited. The information included herein is believed to be accurate and reliable. Application and operation examples described in this publication are given for reference only and Sanken and Allegro assume no responsibility for any infringement of industrial property rights, intellectual property rights, or any other rights of Sanken or Allegro or any third party that may result from its use.
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