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MIC3289

1.2MHz 0.5A Switch WLED Driver with Digital Brightness Control

Status: In Production

Features:

  • Single wire combines 16 level logarithmic brightness and shutdown control
  • 16V/24V OVP options supports up to 4 and 6 WLEDs
  • Start-up in any one of 16 brightness levels
  • Internal Schottky diode
  • 2.5V to 6.5V input voltage
  • 1.2MHz PWM operation
  • Over 500mA switch current
  • 250mV reference voltage
  • ±5% LED current accuracy
  • <1µA shutdown current
  • Over temperature protection
  • UVLO
  • Thin SOT23-6L package option
  • -40°C to 125°C junction temperature range
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Overview
Documents
Development Environment
Similar Devices
RoHS Information
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Device Overview

Summary

The MIC3289 is a PWM boost-switching regulator that is optimized for constant-current white LED driver applications. The MIC3289 features an internal Schottky diode, allowing an efficient DC/DC solution that requires only four external components.

The MIC3289 allows for a single wire simple digital interface to control the dimming over 16 steps with a log scale to give better resolution at the lower currents to better match the sensitivity of the human eye. The pre-programming feature allows the user to select any one of the 16 WLED current levels as the start-up brightness level.

The feedback voltage of the MIC3289 is only 250mV, allowing high efficiency while retaining excellent accuracy for the white LED current.

The MIC3289 implements a constant frequency 1.2MHz PWM control scheme. The high frequency PWM operation saves board space by reducing external component sizes. The 1.2MHz PWM scheme also reduces switching noise and ripple to the input power source.

The 2.5V to 6.5V input voltage range of MIC3289 allows direct operation from single cell Li-Ion as well as 3- to 4-cell NiCad/NiMH/Alkaline batteries. Battery life is preserved with a low 1µA shutdown current.

The MIC3289 is available in a low profile Thin SOT23 6-lead package and has a junction temperature range of -40°C to +125°C.

Additional Features
    • Single wire combines 16 level logarithmic brightness and shutdown control
    • 16V/24V OVP options supports up to 4 and 6 WLEDs
    • Start-up in any one of 16 brightness levels
    • Internal Schottky diode
    • 2.5V to 6.5V input voltage
    • 1.2MHz PWM operation
    • Over 500mA switch current
    • 250mV reference voltage
    • ±5% LED current accuracy
    • <1µA shutdown current
    • Over temperature protection
    • UVLO
    • Thin SOT23-6L package option
    • -40°C to 125°C junction temperature range
Parametrics
Name
Value
Topology
Boost
+Vin min (V)
2.5
+Vin max (V)
6.5
Output Current
2A BJT
Dimming
1-Wire
Package
TSOT, VDFN
Product Type
LED Backlight
VOUT
24
llim Typ (A)
0.75
llim Max (A)
1.2
lq Typ
1.4mA
Int Diode
Yes
Vfb (V)
0.25
Tol Typ %
±5
Duty Cycle Max
0.9
Freq (Hz)
1.2M
OVP
Yes
VEN (V)
1.1
EN
Yes
UVLO Typ (V)
2.1
Ceramic Cap
Yes
Θja (C/W)
235, 93

Documents

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RoHS Information

Part Number
Device Weight (g)
Shipping Weight (grams)
Lead Count
Package Type
Package Width
Solder Composition
JEDEC Indicator
RoHS
China EFUP
MIC3289-24YD6-TR
0.012400
0.149600
6
TSOT
2.9x1.6x1.0mm
NiPdAu
e4
MIC3289-16YD6-TR
0.012400
0.149600
6
TSOT
2.9x1.6x1.0mm
NiPdAu
e4
MIC3289-24YML-TR
0.010900
0.339227
8
VDFN
2x2x0.9mm
NiPdAu
e4
MIC3289-16YML-TR
0.010900
0.339227
8
VDFN
2x2x0.9mm
NiPdAu
e4
To see a complete listing of RoHS data for this device, please Click here
Shipping Weight = Device Weight + Packing Material weight. Please contact sales office if device weight is not available.

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