Part Number: FR9885

Function: 18V, 2A, 500KHz, Synchronous Step-Down DC/DC Converter

Package: SOT-23-6 Type

Manufacturer: Fiti ( fitipower integrated technology lnc )

Images:

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Description

The FR9885 is a synchronous step-down DC/DC converter that provides wide 4.5V to 18V input voltage range and 2A peak load current capability. At light load condition, the FR9885 can operate at PSM mode to support high efficiency and reduce power loss.

This is an electronic circuit used to efficiently reduce a higher input voltage to a lower output voltage. It is a type of switched-mode power supply (SMPS) that is commonly employed in a wide range of applications, including power management in electronics, battery chargers, voltage regulation, and more.

Features

1. Low Rds(on) Integrated Power MOSFET (170mΩ/135mΩ)

2. Internal Compensation Function

3. Wide Input Voltage Range: 4.5V to 18V

4. Adjustable Output Voltage Down to 0.6V

5. 2A Peak Output Current

6. 500kHz Switching Frequency

7. Internal 0.8ms Soft-Start

8. Cycle-by-Cycle Current Limit

9.  Hiccup Short Circuit Protection

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Applications:

1. STB (Set-Top-Box)

2. LCD Display, TV

3. Distributed Power System

4. Networking, XDSL Modem

FR9885 PDF Datasheet

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This post describes for the converter.

The Part Number is TD1583, TD1583P, TD1583PR.

The function of this semiconductor is PWM Buck DC/DC Converter.

The package is SOP-8 pin type

The manufacturer of this part is Techcode.

See the preview image and the PDF file for more information.

1 page

Description

The TD1583 is a 380 KHz fixed frequency monolithic step down switch mode regulator with a built in internal Power MOSFET. It achieves 3A continuous output current over a wide input supply range with excellent load and line regulation.

The device includes a voltage reference, oscillation circuit, error amplifier, internal PMOS and etc. The PWM control circuit is able to adjust the duty ratio linearly from 0 to 100%. An enable function, an over current protection function and a short circuit protection function are built inside. An internal compensation block is built in to minimize external component count.

Features

1. 3A Constant Output Current

2. 80mΩ RDSON Internal Power PMOSFET Switch

3. Up to 95% Efficiency

4. Fixed 380KHz Frequency

5. Wide 3.6V to 28V Input Voltage Range

6. Output Adjustable from 1.222V to 26V

7. Built in Frequency Compensation

8. Built in Thermal Shutdown Function

9. Built in Current Limit Function

Pinouts

Pin Number Pin Name Description
1,6, 8 NC Not Connect.

2 Vin
Supply Voltage Input Pin. TD1583 operates from a 3.6V to 28V DC voltage. Bypass Vin to GND with a suitably large capacitor to eliminate noise on the input.

3 SW Power Switch Output Pin. SW is the switch node that supplies power to the output.

4 GND
Ground Pin. Care must be taken in layout. This pin should be placed outside of the Schottky Diode to output capacitor ground path to prevent switching current spikes from inducing voltage noise into TD1583.

5 FB
Feedback Pin. Through an external resistor divider network, FB senses the output voltage and regulates it. The feedback threshold voltage is 1.222V.

7 EN
Enable Pin. EN is a digital input that turns the regulator on or off. Drive EN pin high to turn on the device, drive it low to turn it off.

Applications:

1. Portable DVD

2. LCD Monitor / TV

3. Battery Charger

4. ADSL Modem

5. Telecom / Networking Equipment

TD1583 PDF Datasheet