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SI-8033JF
Step-Down to 3.3 V, 1.5 A, DC/DC Converter
Designed to meet high-current requirements at high efficiency in industrial and consumer applications; embedded core, memory, or logic supplies; TVs, VCRs, and office or telecommunications equipment, the SI-8033JF dc/dc step-down (buck) converter offers a constant 125 kHz switching frequency essential for low EMI noise. The npn switch is included on the die along with the oscillator, control, and logic circuitry requiring only four external components for a regulated 3.3 V output at up to 1.5 A. A wide input voltage range and integrated thermal and overcurrent protection enhance overall system reliability. Reference accuracy and excellent temperature characteristics are provided. An output-enable input gives the designer complete control over power up, standby, or power down. This device is supplied in a fully molded TO-220-style 5-lead flange-mounted , high power, isolated plastic package. A similar device in a lower-power surface-mount plastic package is the SI-8033JD.
Data Sheet 27469.22*
ABSOLUTE MAXIMUM RATINGS
Input Voltage, VI . . . . . . . . . . . . . 43 V
FEATURES 5.3 V to 40 V Input Range 1.5 A Output Current at 3.3 V 2% Output Voltage Tolerance Foldback Current Limiting Constant 125 kHz Switching Frequency 200 A Maximum Standby Current Soft Start Prevents Supply Voltage Dip Remote Voltage Sensing Thermal Protection APPLICATIONS TVs, VCRs, Electronic Games Embedded Core, Memory, or Logic Supplies Printers and Other Office Equipment Industrial Machinery Telecommunications Equipment
Output Current, IO . . . . . . . . . . . 1.5 A* Enable Input Voltage, VOE . . . . . . . . . . . 6 V Junction Temperature, TJ . . . . +125C Storage Temperature Range, TS . . . . . . . . . . . . -40C 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.
Always order by complete part number, e.g., SI-8033JF .
Sanken Power Devices from Allegro MicroSystems
SI-8033JF Step-Down to 3.3 V, 1.5 A, DC/DC Converter
FUNCTIONAL BLOCK DIAGRAM
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Allowable Package Power Dissipation
Recommended Operating Conditions
Min DC Input Voltage (IO 1 A) (IO 1.5 A) DC Output Current (VI 6.3 V) Operating Junction Temp. 5.3 6.3 0 -30 Max 6.3 40 1.5 +125 Units V V A C
For the availability of parts meeting -40C requirements, contact Allegro's Sales Representative.
This data sheet is based on Sanken data sheet SSJ-02163
115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 Copyright (c) 2004, 2005 Allegro MicroSystems, Inc.
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SI-8033JF Step-Down to 3.3 V, 1.5 A, DC/DC Converter
ELECTRICAL CHARACTERISTICS at TA = +25C, VI = 15 V, IO = 0.5 A (unless otherwise noted).
Limits Characteristic Output Voltage Ref. Volt. Temp. Coeff. Output Short-Circuit Current Efficiency Operating Frequency Line Regulation Load Regulation Quiescent Current Symbol VO Test Conditions Min. 3.234 -- See note 1.6 -- -- VI = 8 V ~ 30 V, IO = 0.5 A VI = 15 V, IO = 0.2 A ~ 0.8 A IO = 0 A VCE = 0.3 V Chip Enable Voltage Soft-Start Current VCE ISS Converter turn-off voltage VSS = 0 V -- -- -- -- -- -- Typ. 3.30 0.5 -- 77 125 25 10 7.0 -- -- -- Max. 3.366 -- -- -- -- 80 30 -- 200 0.5 -100 Units V mV/C A % kHz mV mV mA A V A
aVref
IOM f VO(VI) VO(IO) IIQ
Typical values are given for circuit design information only. Note: Output short-circuit current is at point where output voltage has decreased 5% below VO(nom).
Test Circuit SI-8033JF C1 = 220 F/50 V C2 = 470 F/25 V C3 = 0.47 F/10 V L1 = 100 H D1 = Sanken RK-16
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SI-8033JF Step-Down to 3.3 V, 1.5 A, DC/DC Converter
TYPICAL CHARACTERISTICS
(TA = 25C) Efficiency Overcurrent Protection
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Low-Voltage Behavior
Load Regulation
Temperature Stability
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115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036
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APPLICATIONS INFORMATION
Input Capacitor (C1). Capacitors with low impedance for high-frequency ripple current must be used. Output Capacitor (C2). Capacitors with low impedance for high-frequency ripple current must be used. Especially when the C2 impedance is high, the switching waveform may not be normal at low temperatures. Film or tantalum capacitor for C2 may cause abnormal oscillations. Catch Diode (D1). Diode D1 must be a Schottky diode. Other diode types will result in increased forward voltage spikes, reverse current flow, increased IC power dissipation during the off period, and possible destruction of the IC. Choke Coil (L1). If the winding resistance of the choke coil is too high, the circuit efficiency will decrease. As the overcurrent protection start current is approximately 2.5 A, attention must be paid to the heating of the coil by magnetic saturation due to overload. To reduce the output ripple, the inductor may be increased at the expense of excessive board area and cost.
SI-8033JF Step-Down to 3.3 V, 1.5 A, DC/DC Converter
Soft-Start Capacitor (C3). Soft start for the converter is enabled by connecting a capacitor between terminal 5 and ground. The converter may be turned off by decreasing the terminal 5 voltage below 0.5 V with either an npn small-signal transistor or the output of open-collector TTL. If both a large soft-start capacitor and on/off control are desired, collector current limiting must be used to prevent transistor damage. No external voltage can be applied to terminal 5.
Parallel Operation. Parallel operation to increase load current is not permitted. Overcurrent Protection. The SI-8000JF 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.
SI-8033JF
Typical Application
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SI-8033JF Step-Down to 3.3 V, 1.5 A, DC/DC Converter
APPLICATIONS INFORMATION (cont.)
Thermal Protection. Circuitry turns off the switching transistor when the junction temperature rises above 150C. 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 graph on page 2 illustrates the effect of thermal resistance on the allowable package power dissipation. When mounting to a heat sink, apply silicone grease (ShinEtsu Chemical G746, Dow Corning Toray Silicone SC102, or Toshiba Silicone SY6260). Recommended mounting hardware torque: 0.588 ~ 0.686 Nm or 6.0 ~ 7.0 kgf*cm (4.34 ~ 5.06 lbf*ft). The junction temperature (TJ) can be determined from either of the following equations: TJ = (PDRJA) + TA or TJ = (PDRJC) + TC where PD = VIII - VOIO - VFIO(1 - [VO/VI]) or the adjacent graph, VF = the Schottky diode forward voltage, and RJC = 6C/W.
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Layout Guideline
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115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036
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Dimensions in Millimeters
SI-8033JF Step-Down to 3.3 V, 1.5 A, DC/DC Converter
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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SI-8033JF Step-Down to 3.3 V, 1.5 A, DC/DC Converter
Shipping Container Dimensions in Millimeters
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Primary Packing: 50 pieces per stick
Product Thickness: 0.7 mm 0.3 mm Material: Hard polyvinylchloride (transparent) Warp: Within 2 mm against L-shape dimension
Secondary Packing: Ten sticks, four layers (2000 pieces per box). Cardboard box.
Inner Cover
Stick Stick Underlay Shock-Absorbing Material (50-100 mm)
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115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036
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SI-8033JF Step-Down to 3.3 V, 1.5 A, DC/DC Converter
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.
EI16EI www.allegromicro.com
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