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FR9810 Dataheets PDF



Part Number FR9810
Manufacturers Fiti
Logo Fiti
Description 500KHz Synchronous PWM-Buck DC/DC Converter
Datasheet FR9810 DatasheetFR9810 Datasheet (PDF)

fitipower integrated technology lnc. Preliminary FR9810 21V, 6A, 500KHz Synchronous PWM-Buck DC/DC Converter Description FR9810 is a high-efficiency synchronous mode step-down DC/DC converter that employs a special process technique to obtain very low RDS(ON) for the internal metal–oxide–semiconductor field-effect transistor (MOSFET), with operation voltage in a wide 4.75V to 21V input voltage range. The output current is over 6A, and the efficiency is over 90%. Controller circuit design by .

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fitipower integrated technology lnc. Preliminary FR9810 21V, 6A, 500KHz Synchronous PWM-Buck DC/DC Converter Description FR9810 is a high-efficiency synchronous mode step-down DC/DC converter that employs a special process technique to obtain very low RDS(ON) for the internal metal–oxide–semiconductor field-effect transistor (MOSFET), with operation voltage in a wide 4.75V to 21V input voltage range. The output current is over 6A, and the efficiency is over 90%. Controller circuit design by a particular current mode operation provides fast transient response and eases loop stabilization. This product has a very low standby current less than 1µA in shutdown mode. When the pin voltage is less than 0.4V, FR9810 will turn off the switching voltage regulator function and enter the standby mode. Fault protection includes current protect mode over current protection (OCP), voltage protect mode under voltage lockout protection (UVLO), and internal thermal shutdown. This high-efficiency current mode step-down “Green Power Converter” Fitipower offers the standard small-outline integrated chip (SOIC) package with an exposed pad. Features ● Internal MOSFET RDS(ON) (high side/low side): 120mΩ/20mΩ typ. ● Operation voltage: 4.75V to 21V ● Continuous output current support: 6A ● Feedback voltage: 0.805V ● High efficiency (up to 90%) ● Oscillation frequency (typical): 500 KHz ● Sync to external clock from 300 KHz to 800 KHz ● Internal compensation ● OCP/UVLO protection ● Over Temperature Protection (OTP) with hiccup mode ● < 1µA shutdown current ● Thermal Enhanced SOP-8(Exposed Pad) Package ● RoHS Compliant Applications ● Networking equipment ● OLPC, Netbooks ● Distributed power systems ● LCD monitors/TVs/STBs ● External HDDs ● Security Systems Pin Assignments SP Package (SOP- 8 Exposed pad ) Ordering Information FR9810□□□ TR: Tape / Reel G: Green Package Type SP: SOP-8(Exposed Pad) Figure 1. Pin Assignment of FR9810 FR9810-Preliminary 0.1-FEB-2011 1 fitipower integrated technology lnc. Preliminary Typical Application Circuit FR9810 VIN 4.75V to 18V C4 0.1uF R3 100KΩ 5 SHDN/S 1 VIN 4 BOOST LX 2,3 C1 22uF/25V CERAMIC C3 0.1uF FR9810 7 VCC FB 6 GND 8 L1 1.8uH R1 4.99KΩ/1% R2 10KΩ/1% VOUT 1.2V C2 47uF/6.3V CERAMIC Figure 2. Output 1.2V Application Circuit Figure 3. High Input Voltage Application Circuit FR9810-Preliminary 0.1-FEB-2011 2 fitipower integrated technology lnc. Preliminary FR9810 Functional Pin Description I/O Pin Name Pin No. Pin Function I FB 6 Voltage Feedback Input Pin. FB and VOUT are connected using a resistive voltage divider. This IC senses feedback voltage via FB and regulates it at 805mV. I VIN 1 Power Supply Input Pin. Drive 4.75V to 21V voltage to this pin to power on this chip. A 22µF ceramic bypass capacitor is connected between VIN and GND to eliminate noise. O VCC 7 Bias Supply Output Pin. A 0.1µF capacitor must be connected from this pin to GND. This pin provides a digital control to turn the converter on or off. For automatic start-up, I 5 connect the pin to VIN pin with a 100K ohm resistor. An external clock from 300KHz to 800 KHz can be applied to the pin to change oscillation frequency. O LX 2,3 Power Switching Output Pin. This is the output pin that internal high-side NMOS switches to supply power. O BOOST 4 High-Side Gate-Drive Boost Input. A 0.1µF capacitor is connected from this pin to LX. It can boost the gate drive to fully turn on the internal high-side NMOS. I GND 8 Ground Pin. This pin is connected to the exposed pad with copper. I Exposed Pad Ground Pin. The exposed pad must be soldered to a large PCB area and connected to GND for maximum power dissipation. Block Diagram Figure 4. Block Diagram of FR9810 FR9810-Preliminary 0.1-FEB-2011 3 fitipower integrated technology lnc. Preliminary FR9810 Absolute Maximum Ratings ● Input Supply Voltage VIN--------------------------------------------------------------------------------- -0.3V to +22V ● LX Voltage VLX------------------------------------------------------------------------------------------- -0.3V to VIN +1V ● Boost Voltage VBS ---------------------------------------------------------------------------------------- VLX -0.3V to VLX +6V ● All Other Pins Voltage ---------------------------------------------------------------------------------- -0.3V to +6V ● Maximum Junction Temperature (TJ)----------------------------------------------------------------- +150℃ ● Storage Temperature (TS)------------------------------------------------------------------------------- -65℃ to +150℃ ● Lead Temperature (Soldering, 10sec.) -------------------------------------------------------------- +260°C ● Power Dissipation @TA=25℃, (PD) SOP-8 (Exposed Pad )---------------------------------------------------------------------- 1.25W ● Package Thermal Resistance, (θJA): SOP-8 Exposed Pad------------------------------------------------------------------------- 50°C/W ● Packa.


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