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SI-8120TM Dataheets PDF



Part Number SI-8120TM
Manufacturers Sanken
Logo Sanken
Description DC/DC Step-Down Converter
Datasheet SI-8120TM DatasheetSI-8120TM Datasheet (PDF)

DC/DC Step-Down Converter IC SI-8000TM Series September 2005 ■General Descriptions SI-8000TM series has 300kHz oscillation frequency, so it contributes miniaturization of a chalk coil. Therefore, it realizes a compact and high efficient power supply together with TO 252-5 package (compatible:SC-63) . SI-8000TM series has the function required for switching regulators and protection circuits such as over-current, and overheating. With only four discrete components, it realizes a high efficient .

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DC/DC Step-Down Converter IC SI-8000TM Series September 2005 ■General Descriptions SI-8000TM series has 300kHz oscillation frequency, so it contributes miniaturization of a chalk coil. Therefore, it realizes a compact and high efficient power supply together with TO 252-5 package (compatible:SC-63) . SI-8000TM series has the function required for switching regulators and protection circuits such as over-current, and overheating. With only four discrete components, it realizes a high efficient switching regulator without adjustment. 1.5A output current by compact power surface mount package. ■Package---TO252-5 ■Applications ●DVD Recorder、FPD TV ●OA equipment, such as a printer ●On-board local power supply ■Key Specifications ■Features ●1.5A output current by compact power surface mount package. ● High Efficiency 81% (at VIN=15V, Io=0.5A,Vo=5V) ● Requires only four discrete components. (C3: required for soft start.) ●Built-in Oscillation circuit (oscillation frequency : 300kHz (TYP)) ●Constant current type overcurrent protection and overheating protection. ●Soft start function. (ON/OFF function available. Output OFF at Low level.) ● Low consumption current at Output OFF. Input Voltage Output Current Output Voltage Efficiency (TYP) SI-8008T M (ADJ Type) 0.8V (REF Voltage) 81% (5V Set-up) Typical Connection SI-8033T M SI-8050T M 43V 0 to 1.5A 3.3V 5.0V 76% 81% SI-8120T M 12.0V 87% C1:220μF C2:470μF C3:1μF (At the time of soft start functional use) L1:47μH Di:SFPB66(Sanken) . Sanken Electric Co.,Ltd. http://www.sanken-ele.co.jp/en/ 1/15 I02-001EA-050910 DC/DC Step-Down Converter IC SI-8000TM Series September 2005 1. Scope The present specifications shall apply to a DC-DC buck converter SI-8008TM. 2. Outline Classification Semiconductor IC (monolithic IC) Structure Plastic package (transfer mold) Applications ・DC voltage regulator ・Power supplies for telecommunication equipment , office equipment etc ,ON-board local regulator ・Output voltage regulator at secondary stage of switch mode power supply 3. Absolute maximum ratings 3-1 Absolute maximum ratings Characteristic DC input voltage Power dissipation 1 Power dissipation2 Junction temperature Storage temperature Thermal resistance (junction-case) Thermal resistance (junction-ambient air) Symbol VIN Pd1 Pd2 Tj Tstg θj-c θj-a Ratings 43 1.06 1.65 -40~150 -40~150 6 95 Units Remarks V W W ℃ ℃ ℃/W ℃/W Glass‐epoxy board mounting in 900square ㎜, copper area 4.3% Tjmax=125℃ Glass‐epoxy board mounting in 900square ㎜, copper area 50% Tjmax=125℃ Thermal protection circuit is built-in in this product and when junction temperature rises to 130℃ or higher, it may be caused to operate Recommended max. junction temperature at operation is 125℃. Glass‐epoxy board mounting in 900square ㎜, copper area 4.3% . Sanken Electric Co.,Ltd. 2/15 I02-001EA-050910 DC/DC Step-Down Converter IC SI-8000TM Series September 2005 3-2 Recommended operating conditions Characteristic Symbol DC input voltage range DC output voltage range DC output current range Operating junction temperature range Operating temperature range VIN Vo Io Tjop Top Ratings MIN MAX *1 Vo+3 40 0.8~24 0~1.5 -40~125 -40~125 Units V V A ℃ ℃ Remarks Io=0~1.5A *2 VIN≧Vo+3V *2 *1 The minimum value of DC input voltage range is 8V when output is less than 5V, VO+3,when the output is more than 5V.In the case of VIN=Vo+2~Vo+3V , it is set to Io=1A MAX. *2 To be used within the allowable package power dissipation characteristics (refer to P6). 4. Electrical characteristics 4-1 Electrical characteristics (Ta=25℃、Vo=5V adjusted R1=4.2kΩ,R2=0.8kΩ) Characteristic Symbol MIN Limits TYP MAX Reference voltage VADJ 0.784 0.800 0.816 Units V Reference voltage temperature coefficient ⊿VREF/⊿T ±0.1 mV/℃ Efficiency *3 η 81 % Operating frequency fo 300 kHz Test conditions VIN=15V,IO=0.1A VIN=15V IO=0.1A,Tc=0~100℃ VIN=15V,IO=0.5A , VIN=15V,IO=0.5A Line regulation VLine 60 80 mV VIN=10~30V,IO=0.5A Load regulation VLoad 10 40 mV VIN=15V,IO=0.2~1.5A Over current protection starting current IS 1.6 A VIN=15V ON/OFF terminal *4 Low level voltage Flow-out current at low level voltage Quiescent current 1 Quiescent current 2 VSSL ISSL Iq Iq(off) 0.5 V 10 40 μA VSSL=0V 6 mA VIN=15V,IO=0A 200 400 μA VIN=15V VSS=0V Sanken Electric Co.,Ltd. 3/15 I02-001EA-050910 DC/DC Step-Down Converter IC SI-8000TM Series September 2005 *3 Efficiency is calculated by the following equation. η(%)= VO・IO VIN・IIN ×100 *4 No.5 terminal is a SS terminal to enable soft start by connecting a capacitor. The output can be turned on and off by using a SS terminal. The output is stopped by decreasing the SS terminal voltage below VSSL and in order to perform ON/OFF operation of Vout, it is required to connect NPN transistor or the output of open collector type TTL between No.5 terminal and GND. In case that both soft and Vout ON/OFF are used, a protection measure such as limitation of.


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