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MIC2845A

Status: End of Life

Features:

  • High efficiency (no voltage boost losses)
  • Dynamic Average Matching™ (DAM™)
  • Ultra Fast PWM™ control (200Hz to 500kHz)
  • Input voltage range: 3.0V to 5.5V
  • Dropout of 40mV at 20mA
  • Matching better than ±1.5% (typical)
  • Current accuracy better than ±1.5% (typical)
  • Maintains proper regulation regardless of how many channels are utilized
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Device Overview

Summary

The MIC2845A is a high efficiency White LED (WLED) driver designed to drive up to six LEDs, greatly extending battery life for portable display backlighting, keypad backlighting, and camera flash in mobile devices. The MIC2845A provides the highest possible efficiency as this architecture has no switching losses present in traditional charge pumps or inductive boost circuits. The MIC2845A provides six linear drivers channels which maintain constant current for up to six LEDs. It features a typical dropout of 40mV at 20mA. This allows the LEDs to be driven directly from the battery eliminating switching noise/losses present with the use of boost circuitry.

The MIC2845A features Dynamic Average Matching™ (DAM™) which is specifically designed to provide optimum matching across all WLEDs. The six channels are matched better than ±1.5% typical, ensuring uniform display illumination under all conditions. The brightness is controlled through an Ultra Fast PWM™ Control interface operating down to less than 1% duty cycle.

The MIC2845A also features two independently enabled low quiescent current LDOs. Each LDO offers ±3% accuracy from the nominal voltage over temperature, low dropout voltage (150mV @ 150mA), and low ground current under all load conditions (typically 35µA). Both LDOs can be disabled to draw virtually no current.

The MIC2845A is available in the 14-pin 2.5mm x 2.5mm Thin MLF® leadless package with a junction temperature range of -40°C to +125°C.

Please consider this device MIC2846A

Additional Features
    • High efficiency (no voltage boost losses)
    • Dynamic Average Matching™ (DAM™)
    • Ultra Fast PWM™ control (200Hz to 500kHz)
    • Input voltage range: 3.0V to 5.5V
    • Dropout of 40mV at 20mA
    • Matching better than ±1.5% (typical)
    • Current accuracy better than ±1.5% (typical)
    • Maintains proper regulation regardless of how many channels are utilized
Parametrics
Name
Value
+Vin min (V)
3
+Vin max (V)
5.5
Product Type
Linear LED Drivers
# of White LEDs
6 @ 20mA
Operating Iq (µA)
1.4
ILED Matching
±1.5%
Θja (C/W)
90
Vdropout @ 20mA
40mV
Extra LDOs
2
Vdropout (mV)
150
IQ LDO
35

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