W83321G Nuvoton Technology Corporation of America, W83321G Datasheet

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... N-Channel FET Synchronous Buck Regulator Controller W83321S/W83321G Winbond W83321S W83321G Publication Release Date: January, 2006 - 1 - Revision 0.51 ...

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... Winbond for any damages resulting from such improper use or sales. W83321S VERSION ON WEB 0.5 N.A All versions before 0.5 are for internal use only. 1. Add Pb-free part no:W83321G 0.51 N.A 2. Add separate VCC12 rail for VBOOT application circuit W83321S/W83321G ...

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... PIN-OUT ..................................................................................................................................... 5 5. PIN DESCRIPTION..................................................................................................................... 6 6. INTERNAL BLOCK DIAGRAM ................................................................................................... 7 7. APPLICATION CIRCUIT............................................................................................................. 8 8. LAYOUT PLACEMENT............................................................................................................... 9 9. ELECTRICAL CHARACTERISTICS......................................................................................... 10 10. TYPICAL OPERATING WAVEFORMS .................................................................................... 11 11. PACKAGE DIMENSION OUTLINE........................................................................................... 16 12. ORDERING INSTRUCTION ..................................................................................................... 17 13. HOW TO READ THE TOP MARKING...................................................................................... 17 W83321S/W83321G Publication Release Date: January, 2006 - 3 - Revision 0.51 ...

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... Fast Transient Response Lossless, Programmable Overcurrent Protection - Uses Lower MOSFET’s Rds (on) - Current limit without sense resistor Small Converter Size - 250 kHz Fixed Frequency Oscillator - Internal Soft Start - Tiny plastic SOP-8 package varies. The adaptive non-overlapping MOSFET gate drivers help W83321S/W83321G ...

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... Cable Modems, Set Top Boxes, and DSL Modems DSP and Core Communications Processor Supplies Memory Power Supplies Personal Computer Peripherals Industrial Power Supplies 5V-Input DC-DC Regulators Low-Voltage Distributed Power Supplies 4. PIN-OUT 1 BOOT 2 UGATE 3 GND LGATE 4 W83321S/W83321G W83321 Publication Release Date: January, 2006 - ISEN 7 COMP FB 6 VCC 5 Revision 0.51 ...

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... Internal Error Amplifier Output Pin. This pin is available for compensation of the 7 COMP control loop and pulling this pin low with an open drain device will shutdown the IC. Current limit threshold setting. Connect a resistor (R 8 ISEN the drain of the low-side MOSFET. W83321S/W83321G FUNCTION ) between this pin and OCSET - 6 - ...

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... ISEN, causing a fixed voltage drop. This fixed voltage is compared against V and if the latter is higher, the chip enters current limit mode. In the current DS limit mode both the high-side and low-side MOSFETS are turned off. After a 25ms delay, a soft-start W83321S/W83321G VDD POR Soft Start Control ...

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... L1 3.3uH N DSG DSG C10 6.8nF R7 10 VCC12 C1 VCC5 1000uF 2000uF 1uF 3 L1 3.3uH N DSG DSG C10 6.8nF - 8 - W83321S/W83321G R1 3. BOOT ISEN C4 (OPT UGATE COMP 2.2nF GND LGATE VCC W83321S C9 1uF R5 16K(1%) R6 7.5K(1%) R1 3.7K C11 1uF BOOT ...

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... W83321S BOOT Layout Notes: 1.Put Q1 and Q2 as close as possible and using wide,short printed circuit traces between Q1 source and Q2 drain. 2.Put C2 and near the Q1 drain and Q2 source nodes. 3.Put C1 as close as to BOOT pin. 4.Put C9 as close as to VCC pin. W83321S/W83321G ...

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... High-side Gate I HGATE-SRC Source High-side Gate Sink I HGATE-SNK Low-side Gate I LGATE-SRC Source Low-side Gate Sink I LGATE-SNK PROTECTION/DISABLE ISEN Current I SEN Source Disable Threshold V COMP W83321S/W83321G TEST CONDITIONS EN=V ; UGATE and LGATE CC Open V =12V,V =6V BOOT UGATE V =12V,V =6V BOOT UGATE V =5V, V =2.5V CC LGATE V =5V ...

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... TYPICAL OPERATING WAVEFORMS Dead Time: VCC=5V; VOUT=2.5V Channel 1: UGATE Channel 2: LGATE Dead Time: VCC=5V; VOUT=2.5V Channel 1: UGATE Channel 2: LGATE W83321S/W83321G Publication Release Date: January, 2006 - 11 - Revision 0.51 ...

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... Power On: VCC=5V; VOUT=2.5V Channel 1: VCC Channel 2: VOUT Power Off: VCC=5V; VOUT=2.5V Channel 1: VCC Channel 2: VOUT W83321S/W83321G - 12 - ...

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... Bootstrap: VCC=5V; VOUT=2.5V Channel 1: UGATE Channel 2: LGATE Channel 3: BOOT Soft Start: VCC=5V; VOUT=2.5V Channel 1: UGATE Channel 2: VOUT W83321S/W83321G Publication Release Date: January, 2006 - 13 - Revision 0.51 ...

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... Load Transient: VCC=5V; VOUT=2.5V; Cout=2200uF Channel 3: VOUT Channel 4: Iout (Loading=0 5A) Load Transient: VCC=5V; VOUT=2.5V; Cout=2200uF Channel 3: VOUT Channel 4: Iout (Loading=5 0A) W83321S/W83321G - 14 - ...

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... Short Hiccup: VCC=5V; VOUT=2.5V; Cout=2200uF with R=0.1(ohm) load. Channel 1: UGATE Channel 2: VOUT Channel4: Iout W83321S/W83321G Publication Release Date: January, 2006 - 15 - Revision 0.51 ...

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... PACKAGE DIMENSION OUTLINE 8L SOP (150mil) W83321S/W83321G - 16 - ...

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... Line: the part number,321G is for Pb-free package rd 3 Line: Tracking Code 323: packages assembled in Year 03’, week 23 G: assembly house ID; G means GR, O means OSE, etc. A: the IC version W83321S/W83321G REMARKS Operation - Commercial 0~70℃ Operation - Commercial 0~70℃ Pb-free package Publication Release Date: January, 2006 - 17 - ...

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... Winbond products could result or lead to a situation wherein personal injury, death or severe property or environmental damage could occur. Winbond customers using or selling these products for use in such applications their own risk and agree to fully indemnify Winbond for any damages resulting from such improper use or sales. W83321S/W83321G Important Notice - 18 - ...