Document
Data Sheet 27469.32*
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SI-8050JF
Step-Down to 5.0 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-8050JF 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 5.0 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-8050JD.
ABSOLUTE MAXIMUM RATINGS
Input Voltage, VI . . . . . . . . . . . . . 43 V
Output Current, IO . . . . . . . . . . . 1.5 A*
Enable Input Voltage, VOE . . . . . . . . . . . 6 V
Junction Temperature, TJ . . . . +125°C
Storage Temperature Range, TS . . . . . . . . . . . . -40°C to +125°C
* 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 +125°C.
FEATURES ■ 7 V to 40 V Input Range ■ 1.5 A Output Current at 5.0 V ■ 2% Output Voltage Tolerance ■ Foldback Current Limiting ■ Constant 125 kHz Switching Frequency ■ 200 µA 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
Always order by complete part number, e.g., SI-8050JF .
Sanken Power Devices from Allegro MicroSystems
SI-8050JF Step-Down to 5.0 V, 1.5 A, DC/DC Converter
FUNCTIONAL BLOCK DIAGRAM
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Allowable Package Power Dissipation
Recommended Operating Conditions
DC Input Voltage (IO ≤ 1 A) (IO ≤ 1.5 A)
DC Output Current (VI ≥ 6.3 V) Operating Junction Temp.
Min
7 8 0 -30
Max Units
8V 40 V 1.5 A +125 °C
For the availability of parts meeting -40°C requirements, contact Allegro’s Sales Representative.
This data sheet is based on Sanken data sheet SSJ-02162
115 Northeast Cutoff, Box 15036
2 Worcester, Massachusetts 01615-0036
Copyright © 2004, 2005 Allegro MicroSystems, Inc.
SwRitecghuinlagtors
SI-8050JF Step-Down
to 5.0 V, 1.5 A, DC/DC Converter
ELECTRICAL CHARACTERISTICS at TA = +25°C, VI = 20 V, IO = 0.5 A (unless otherwise noted).
Limits
Characteristic
Symbol Test Conditions
Min. Typ. Max.
Output Voltage Ref. Volt. Temp. Coeff. Output Short-Circuit Current Efficien.