Microchip Technology MIC2297-38YML-TR

Description
The MIC2297 is a 600KHz PWM boost-switching regulator optimized for driving 6-10 series white LEDs. With an internal 40V switch and a guaranteed switch current of 1.2A, it can easily drive a string of 10 white LEDs in series at 20mA, ensuring high brightness and eliminating the need for ballast resistors.
The MIC2297 implements constant frequency 600KHz PWM control, saving board space by reducing external component sizes. The constant frequency PWM operation also results in lower noise and input ripple injected back to the battery source compared to variable frequency topologies.
To optimize efficiency, the feedback voltage is set to 200mV, reducing power dissipation in the current set resistor and allowing for the lowest total output voltage, minimizing current draw from the battery.
The MIC2297 is available with output over-voltage protection, safeguarding the IC and external components in case of open LED conditions.

Features
Input voltage range: 2.5V to 10V
Output voltage up to 40V
Switch current: 1.2A
600KHz PWM operation
Trimmed 200mV feedback voltage
Output over-voltage protection (fixed or adjustable)
PWM Brightness Control
DAC Brightness Control
<1% line regulation
1μA shutdown current
Over-temperature protection
UVLO
10-pin 2.5mm x 2.5mm MLF package
Junction temperature range: -40°C to 125°C

Applications
PDAs
GPS systems
Smartphones
Mini PCs
Digital cameras
IP phones
LED flashlights