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-3025ZD voltage regulator offers the reduced dropout voltage and low quiescent current essential for im- proved efficiency. this device delivers a regulated output at up to 3 a. integrated thermal and overcurrent protection enhance overall system reliability. devices with an adjustable output voltage or a 3.3 v fixed output 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 3 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 surface-mount plastic package (to-263) with ground tab to provide a low-resistance path for maximum heat dissipation. a similar device in a flange-mounted (to-220-style) high-power package is the si-3025zf. features 3 a output current at 2.5 v 0.6 v maximum dropout voltage at i o = 3 a 1 a maximum standby current remote voltage sensing foldback current limiting 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 high-current, low-dropout, 2.5 v regulator data sheet 27468.26 always order by complete part number, e.g., SI-3025ZD-tl , where ?-tl? indicates tape and reel. absolute maximum ratings input voltage, v i . . . . . . . . . . . . . 10 v output current, i o . . . . . . . . . . . . . 3 a* enable input voltage, v e . . . . . . . . 6 v junction temperature, t j . . . . +125c storage temperature range, t s . . . . . . . . . . . . -40c to +125c * output current rating is limited by input voltage, duty cycle, and ambient tempera- ture. under any set of conditions, do not exceed a junction temperature of +125c. si-3025 zd linear regulators sanken power devices from allegro microsystems
SI-3025ZD high-current, low-dropout, 2.5 v regulator 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 linear regulators 2 functional block diagram copyright ? 2004 allegro microsystems, inc. recommended operating conditions min max units dc input voltage ? 6 v dc output current 0 3 a operating junction temp. -20 +100 c allowable package power dissipation this data sheet is based on sanken data sheet ssj-02589
SI-3025ZD high-current, low-dropout, 2.5 v regulator www.allegromicro.com linear regulators 3 electrical characteristics at t a = +25c, v e = 2 v (unless otherwise noted). limits characteristic symbol test conditions min. typ. max. units output voltage v o v i = 3.3 v, i o = 10 ma 2.45 2.50 2.55 v v o(off) v e = 0 v ? ? 0.5 v output volt. temp. coeff. a vo 0c t j 100c ? 0.3 ? mv/c output short-circuit current i om v i = 3.3 v, see note 3.2 ? ? a line regulation ? v o( ? vi) v i = 3.0 ~ 5.0 v, i o = 10 ma ? ? 10 mv load regulation ? v o( ? io) v i = 3.3 v, i o = 0 a ~ 3.0 a ? ? 40 mv dropout voltage v imin - v o i o = 3.0 a ? ? 0.6 v ground terminal current i gnd v i = 3.3 v, i o = 0 ma, v e = 2.0 v ? 1.0 1.5 ma v i = 3.3 v, v e = 0 v ? ? 1.0 a enable input voltage v eh output on 2.0 ? ? v v el output off ? ? 0.8 v enable input current i eh v e = 2.7 v ? ? 100 a i el v e = 0 v ? 0 -5.0 a ripple rejection ratio psrr v i = 3.3 v, 100 hz f 120 hz ? 60 ? db thermal shutdown t j 135 152 ? c typical values are given for circuit design information only. note: output short-circuit current is at point where output voltage has decreased 5% below v o(nom) .
SI-3025ZD high-current, low-dropout, 2.5 v regulator 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 linear regulators 4 typical characteristics (t a = 25c) dropout voltage low-voltage behavior gnd pin current line regulation load regulation enable control voltage overcurrent protection enable control current thermal protection
SI-3025ZD high-current, low-dropout, 2.5 v regulator www.allegromicro.com linear regulators 5 applications information input capacitor (c i , 0.1 f to 10 f). this is necessary either when the input line includes inductance or when the wiring is long. output capacitor (c o , > 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. determination of dc input voltage. the minimum input voltage v i (min) should be higher than the sum of the output voltage and the maximum rated dropout voltage. increased output voltage. the output voltage (v o ) may be increased by inserting a resistor (r ext ) between sense and output. the current flowing into sense is typically 90 a 30%. to minimize the effect of i sense and temperature on r ext , it is recommended that a 6.8 k ? resistor be added between sense and gnd to increase the current in r ext . the value of r ext is then r ext = (v o ? 2.5) 10 6 /458 overcurrent protection. the si-3000zd 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 (t j ) 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 illus- trates the effect of the copper area on the junction-to- ambient thermal resistance (r ja ). the junction temperature (t j ) can be determined from either of the following equations: t j = (p d r ja ) + t a or t j = (p d r jt ) + t t where p d = i o (v i ? v o ) and r jt = 3c/w. parallel operation. parallel operation to increase load current is not permitted.
SI-3025ZD high-current, low-dropout, 2.5 v regulator 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 linear regulators 6 dimensions in millimeters notes: 1. dimensions do not include mold protrusions. 2. ( ) is reference. 3. [ ] is assembly out quality. 4. heat sink side flash: 0.8 mm max. 5. terminal finish: pure sn (category e3) 6. product weight: approximately 1.48 g tab temperature (t t ) measured here recommended land pattern
SI-3025ZD high-current, low-dropout, 2.5 v regulator www.allegromicro.com linear regulators 7 tape specifications 1. material: conductive polystyrene. 2. allowable camber: 1 mm/100 mm maximum. 3. a0 (10.6 mm) and b0 (15.7 mm) measured on a plane 0.3 mm above the bottom of the pocket. 4. k0 (4.9 mm) is measured from a plane on the inside bottom of the pocket to the surface of the carrier. 5. ten pitches cumulative tolerance on tape 0.2 mm. 6. the space between parts and cavity must not exceed 0.3 mm from its normal position in any direction. 7. surface resistivity of embossment: 10 7 ohm/cm 2 max. 8. k1 = 3.9 mm. tape and reel dimensions in millimeters
SI-3025ZD high-current, low-dropout, 2.5 v regulator 115 northeast cutoff, box 15036 worcester, massachusetts 01615-0036 linear regulators 8 inner box 2 reels per box, 800 pieces per reel outer box shipping container dimensions in millimeters
SI-3025ZD high-current, low-dropout, 2.5 v regulator www.allegromicro.com linear regulators 9 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 publica- tion 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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