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MIC3287

Features: • 2.8V to 5.5V Input Voltage• 350mA Switch Current• 1.2 MHz PWM Operation• 250mV Feedback Voltage• 24V Output Over-Voltage Protection (OVP) Option• <1% Line and Load Regulation• <1A Shutdown Current• Over-Temperature Protection•...

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SeekIC No. : 004420875 Detail

MIC3287: Features: • 2.8V to 5.5V Input Voltage• 350mA Switch Current• 1.2 MHz PWM Operation• 250mV Feedback Voltage• 24V Output Over-Voltage Protection (OVP) Option• <...

MIC3287 Data Sheet

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Part Number:
MIC3287
Supply Ability:
5000

Price Break

  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Upload time: 2024/11/26

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Product Details

Description



Features:

• 2.8V to 5.5V Input Voltage
• 350mA Switch Current
• 1.2 MHz PWM Operation
• 250mV Feedback Voltage
• 24V Output Over-Voltage Protection (OVP) Option
• <1% Line and Load Regulation
• <1A Shutdown Current
• Over-Temperature Protection
• Under-Voltage Lock Out (UVLO)
• Low Profile Thin SOT-23-5 Package Option
• Low Profile Thin SOT-23-6 Package Option
• 8-pin 2mm x 2mm MLF™ Package Option
• 40°C to +125°C Junction Temperature Range


Application

• White LED Driver for Backlighting:
- Cell phones
- PDAs
- GPS systems
- Digital cameras
- MP3 players
- IP phones
• LED Flashlights
• Constant Current Power Supplies


Pinout

Connection Diagram


Specifications

Supply Voltage (VIN) ...................................................... 6V
Switch Voltage (VSW) ....................................0.3V to 34V
Enable Pin Voltage (VEN) ................................. 0.3 to VIN
FB Voltage (VFB) ........................................................... 6V
Switch Current (ISW) .................................................. 1.2A
Ambient Storage Temperature (TS) .... 65°C to +150°C
ESD Rating(3) ............................................................. 2kV


Description

The MIC3287 is a 1.2MHz pulse width modulated (PWM) step-up switching regulator that is optimized for constant current white LED driving applications. With a maximum output voltage of 24V and a switch current of over 350mA, the MIC3287 drives a string of up to 4 white LEDs in series, ensuring uniform brightness and eliminating several ballast resistors.

The MIC3287 implements a constant frequency 1.2MHz PWM current-mode control scheme. The high frequency PWM operation saves board space by reducing external component sizes. The added benefit of the constant frequency PWM control scheme as opposed to variable frequency control schemes is much lower noise and input ripple injected back to the battery source. To optimize efficiency, the feedback voltage is set to only 250mV. The MIC3287 is also available with a maximum 24V over-voltage protection.

The MIC3287 is available in low profile Thin SOT-23 5-pin and Thin SOT-23 6-pin packages. The MIC3287 has a junction temperature range of 40°C to +125°C.

All support documentation can be found on Micrel's web site at: www.micrel.com.




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