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MIC3291

EOL

Status: End of Life

Features:

  • Single wire combines 16 level linear brightness and shutdown control
  • 18V/25V OVP options supports up to four and six WLEDs
  • Startup 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
  • UVLO and over-temperature protection
  • Thin SOT23-6L package option
  • 2mm x 2mm leadless MLF®package option
  • -40°C to +125 °C junction temperature range
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Device Overview

Summary

The MIC3291 is a PWM switching boost regulator that is optimized for constant current white LED (WLED) driver applications. The MIC3291 features an internal Schottky diode, allowing an efficient DC/DC solution that requires only four external components.

The MIC3291 allows for a single-wire simple digital interface to control the dimming over 16 steps with a linear scale. The preprogramming 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 MIC3291 is only 250mV, allowing high efficiency while retaining excellent accuracy for the WLED current.

The MIC3291 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 the MIC3291 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 MIC3291 is available in a low profile Thin SOT23 6-pin and 2mm x 2mm MLF® 8-pin packages with a junction temperature range of -40°C to +125°C.

Please consider this device MIC3289

Additional Features
    • Single wire combines 16 level linear brightness and shutdown control
    • 18V/25V OVP options supports up to four and six WLEDs
    • Startup 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
    • UVLO and over-temperature protection
    • Thin SOT23-6L package option
    • 2mm x 2mm leadless MLF®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
25
llim Typ (A)
0.75
llim Max (A)
1.2
lq Typ
2.0mA
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, 95

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