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MFG:1565  Package Cooled:MIC  D/C:TSOP8  

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Part Number: MIC4827

 

MFG: 1565

Package Cooled: MIC

D/C: TSOP8

Description: Micrel's MIC4827 is a high output voltage, DC to AC converter,designed for driving EL (Electroluminesc...


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MIC4827 General Description


Micrel's MIC4827 is a high output voltage, DC to AC converter,designed for driving EL (Electroluminescent) lamps.The device operates from an input voltage range of 1.8V to 5.5V, making it suitable for 1-cell Li Ion and 2- or 3-cell alkaline/NiCad/NiMH battery applications. The MIC4827 converts a low voltage DC input to a 180VPP AC output signal that drives the EL lamp.

The MIC4827 is comprised of two stages: a boost stage, and an H-bridge, lamp driver, stage. The boost stage steps the input voltage up to +90V. The H-bridge stage then alternately switches the +90V output to each terminal of the EL lamp,thus creating a 180VPP AC signal to drive the EL lamp and generate light.

The MIC4827 features separate oscillators for the boost- and H-bridge stages. External resistors independently set the operating frequency of each stage. This flexibility allows the EL lamp circuit to be optimized for maximum efficiency and brightness.

The MIC4827 uses a single inductor and a minimum number of external components, making it ideal for portable, spacesensitive applications.

The MIC4827 is available in an 8-pin MSOP package with an ambient temperature range of 40°C to +85°C.

MIC4827 Maximum Ratings

Supply Voltage (VDD) ................................................0.5V to 6V
Output Voltage (VCS) ........................................... 0.5V to 100V
Frequency Control Voltage (VRSW, VREL) ... 0.5V to (VDD +0.3V)
Power Dissipation @ TA = 85°C .......................................200mW
Storage Temperature (TS) ............................... 65°C to +150°C
ESD Rating ........................................................................Note 3

MIC4827 Features

• 1.8V to 5.5V DC input voltage
• 180VPP regulated AC output waveform
• Independently adjustable EL lamp frequency
• Independently adjustable boost converter frequency
• 0.1A shutdown current

MIC4827 Typical Application

• LCD panel backlight
• Cellular phones
• PDAs
• Pagers
• Calculators
• Remote controls
• Portable phones

MIC4827 Connection Diagram

MIC4827  Connection Diagram

MIC4827 datasheet

MIC4827BMM
PDF/DataSheet Download

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