FR9886 Datasheet – 2A, Step-Down DC/DC Converter IC
23V, 2A, 380KHz Synchronous Step-Down DC/DC Converter
Package SOP 8 Pin Type
FR9886 overview
The FR9886 is a synchronous step-down DC/DC converter that provides wide 4.5V to 23V input voltage range and 2.5A continuous load current capability.
The FR9886 fault protection includes cycle-by-cycle current limit, UVLO, output overvoltage protection and thermal shutdown. The adjustable soft-start function prevents inrush current at turn-on. This device uses current mode control scheme which provides fast transient response. Internal compensation function reduces external compensation components and simplifies the design process. In shutdown mode, the supply current is less than 1μA.
The FR9886 is available in a SOP-8/SOP-8 exposed pad package, and provides good thermal conductance.
| Part Number | FR9886 |
| Function | 23V, 2A, 380KHz Synchronous Step-Down DC/DC Converter |
| Package | SOP 8 Pin Type |
| Manufacturer | Fitipower integrated technology |
| Datasheet | Download PDF  |
Datasheet
fr9886-datasheet.pdf
FR9886 features
- High Efficiency up to 96%
- Low Rds(on) Integrated Power MOSFET
- Internal Compensation Function
- Wide Input Voltage Range: 4.5V to 23V
- Adjustable Output Voltage from 0.925V to 20V
- 2.5A Output Current
- Fixed 340KHz Switching Frequency
- Current Mode Operation
- Adjustable Soft-Start
- Cycle-by-Cycle Current Limit
- Over-Temperature Protection with Auto Recovery
- Output Overvoltage Protection
- Under Voltage Lockout
- SOP-8 and SOP-8 Exposed Pad Packages
FR9886 pinout
| Pin | Name | Description |
|---|---|---|
| 5 | FB | Voltage Feedback Input Pin. Connect FB and VOUT with a resistive voltage divider. This IC senses feedback voltage via FB and regulates it at 0.925V. |
| 2 | VIN | Power Supply Input Pin. Drive VIN pin by 4.5V to 23V voltage to power on the chip. |
| 7 | SHDN | Enable Input Pin. This pin is a digital control input that turns the converter on or off. Connect to VIN with a 100KΩ resistor for self-startup. |
| 4 | GND | Ground Pin. Connect GND to exposed pad. |
| 3 | LX | Power Switching Output. LX is the output of the internal high side NMOS switch. |
| 8 | SS | Soft-Start Pin. SS controls the soft-start period. Connect a capacitor from SS to GND to set the soft start period. |
| 1 | BOOST | High Side Gate Drive Boost Pin. A 10nF or greater capacitor must be connected from this pin to LX. It can boost the gate drive to fully turn on the internal high side NMOS. |
| 6 | NC | No connection. |
Absolute maximum ratings
| Parameter | Value |
|---|---|
| Supply Voltage VIN | -0.3V to +25V |
| Enable Voltage VSHDN | -0.3V to +25V |
| LX Voltage VLX (50ns) | -1V to VIN+0.3V |
| BOOST Pin Voltage VBOOST | VLX-0.3V to VLX+6V |
| All Other Pins Voltage | -0.3V to +6V |
| Maximum Junction Temperature (TJ) | +150°C |
| Storage Temperature (TS) | -65°C to +150°C |
| Lead Temperature (Soldering, 10sec.) | +260°C |
| Power Dissipation @TA=25°C, (PD) SOP-8 SOP-8 (Exposed Pad) | 1.39 W2.08 W |
| Package Thermal Resistance, (θJA) SOP-8 SOP-8 (Exposed Pad) | 90°C/W60°C/W |
| Package Thermal Resistance, (θJC) SOP-8 SOP-8 (Exposed Pad) | 39°C/W15°C/W |
FR9886 applications
- STB (Set-Top-Box)
- LCD Display, TV
- Distributed Power System
- Networking, XDSL Modem
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