Buck Regulator is housed in 7-lead SPAK package.

Press Release Summary:

MIC4685 PWM, 200 KHz buck regulator carries input voltage range of 4 to 34 V and has 3 A output current. Output voltage is adjustable down to 1.25 V. Junction-to-case thermal impedance of 2.2°C/W enables device to provide more than 3 A of continuous output current without heatsink. Features include typical 150 microamp shutdown current, cycle-by-cycle current limit, and frequency foldback short circuit protection.

Original Press Release:

Micrel Releases 3A SuperSwitcher(TM) Buck Regulator in SPAK

- 36% smaller footprint than TO-263 (D²PAK) devices
- Wide input voltage range of 4V to 34V, and high 3A output current.

SAN JOSE, Calif. -- (May 9, 2002) -- A high-current, high-efficiency buck regulator in a package 36% smaller than the commonly used TO-263 (D²PAK) is now available from Micrel Semiconductor (NASDAQ: MCRL), an industry leader in analog, power management and high-speed communication integrated circuits.

The MIC4685, the newest member of the SuperSwitcher(TM) family, is a 200KHz, PWM buck regulator housed in a 7-lead SPAK package. The device boasts a wide input voltage range of 4V to 34V, and a high 3A output current. Output voltage is adjustable down to 1.25V.

"The MIC4685 is ideal for applications where space and efficiency are critical. Its high efficiency operation and low junction-to-case thermal impedance of 2.2degC/W enables the device to provide more than 3A of continuous output current without a heatsink. In many applications, the MIC4685 can replace other regulators in bulky D²PAK and TO-220 packages," says Tony Grizelj, Micrel's marketing manager for power products.

The MIC4685 allows bulletproof designs with built-in safety features such as a cycle-by-cycle current limit, frequency foldback short circuit protection, and thermal shutdown.

The MIC4685BM is priced at $2.85 when purchased in 1,000-piece quantities. Samples are available from stock, and production quantities are stock to 12 weeks ARO.

Summary of Features & Applications:
MIC4685 SPAK-07L SuperSwitcher Buck Regulator

- 4V to 34V input voltage
- 3A continuous current
- 200kHz constant frequency PWM control
- Over 85% efficient
- Adjustable output voltages down to 1.25V
- Typical 150uA shutdown current
- Internally compensated with fast response times
- Bullet proof protection includes
- Cycle-by-cycle current limit
- Frequency foldback short circuit protection
- Thermal shutdown

- Distributed-power designs
- Point of load power supplies
- LCD power supplies
- Local 12V to 5V/3.3V/2.5V/1.8V conversion
- Local 5V to 3.3V/2.5V/1.8V conversion
- Battery chargers
- Replaces larger TO-220 and TO-263 designs

Micrel Semiconductor is a leading manufacturer of advanced, high performance communications, clock management, Ethernet switch and physical layer transceiver, mixed signal, analog and power ICs. These products include devices for fiber-optic telecommunications and networking, cellular telephones, servers, portable computer systems, computer peripherals, process control systems, consumer electronics and power supplies.

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