Microchip | MIC2298-15YML-TR

The MIC2298 is a high power boost-switching regulator that is optimized for constant-current control. The MIC2298 is capable of driving up to 2 series 1 A white LED for photoflash, flashlight and other applications. The feedback voltage is only 200 mV, minimizing ballast power dissipa-tion in constant-current control applications for improved operating efficiency.

The MIC2298 has a brightness pin that allows for a programmable torch mode as well full flash with a single pin when driving high current LEDs. The MIC2298 implements a constant frequency 1 MHz PWM control scheme to make the smallest possible design. The 2.5 V to 10 V input voltage range of MIC2298 allows direct operation from 1- and 2-cell Li Ion as well as 3- to 6-cell NiCad/NiMH/Alkaline battery sources. Maximum battery life is assured with a low 1 µA shutdown current. The MIC2298 is available in a low profile 12-pin 3x3 MLF ® package.

Key Features:

• 3.5 A minimum switch current delivers at least 7 W of output power over temperature.
• 200 mV ± 10% feedback voltage.
• 2.5 V to 10 V input voltage.
• Output voltage up to 30 V (max).
• 12-pin 3 mm x 3 mm leadless MLF ® package.
• Output over-voltage protection (OVP).
• 1 MHz operation.
• Programmable output current.
• <1% line regulation.
• 1 µA shutdown current.
• Over temperature protection.
• Externally programmable soft-start.
• Under-voltage lockout (UVLO).
• –40 °C to +125 °C junction temperature range.

Applications:

• Cell phones.
• PDAs.
• Digital cameras.
• White LED flashlights.