Regulator Gives Bright Light with Few Components
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Micrel's MIC2297 can be used to drive a string of 10 white LEDs at 20mA, ensuring a high level of brightness
while requiring very few ballast resistors. |
The device is a 600kHz, PWM boost-switching regulator with an internal 40V switch and a guaranteed switch current of 1.2A. It employs
constant frequency, PWM control and the high frequency allows smaller external components to be used, reducing the board space requirement.
An additional benefit of the MIC2297's constant frequency PWM operation is lower noise.
To optimize efficiency, the feedback voltage is set to 200mV. This low voltage supports a minimal level of power dissipation in the current
set resistor. It also provides a low total output voltage, minimizing the current drawn from the battery.
The MIC2297 is available with output over voltage protection. It safeguards the IC and external components in the event of open
LED conditions.
The MIC2297 helps produce high brightness light while optimizing power efficiency
| Features |
- 2.5V to 10V input voltage
- Up to 40V output voltage
- PWM brightness control
- DAC brightness control
- <1% line regulation
- Over temperature protection
- Under voltage lockout
- 2.5mm x 2.5mm MLF-10L package
- -40°C to 125°C temperature range
- 1.2A switch current
- 600kHz PWM operation
- Trimmed 200mV feedback voltage
- Output over voltage protection (fixed or adjustable)
- 1µA shutdown current
- UVLO
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| Applications |
- Portable appliances
- Instrumentation
- LED flashlights
- PDAs
- GPS systems
- Smart phones
- Mini PCs
- Digital cameras
- IP phones
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Featured Products
| Part Number |
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Description |
Data
Sheet |
App.
Notes |
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| MIC2297-42YML TR |
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40V PWM Boost Regulator White LED Driver
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