Features: 1.8V to 5.5V DC input voltage
160V PP regulated AC output waveform
Independently adjustable EL lamp frequency
Independently adjustable boost converter frequency
0.1A shutdown currentApplicationLCD panel backlight
Cellular phones
PDAs
Pagers
Calculators
Remote controls
Portable phonesPinout
SpecificationsSupply Voltage (VDD )................................................ 0.5V to +6V
Output Voltage (VCS ) ........................................... 0.5V to +100V
Frequency Control Voltage (VRSW , V REL DD )...0.5V to (V + 0.3V)
Power Dissipation @ T A = 85°C .........................................200mW
Storage Temperature (TS ) ...............................65°C to +150°C
ESD Rating ........................................................................... Note 3DescriptionMicrel's MIC4826 is a high output voltage, DC to AC con- verter, 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 MIC4826 con- verts a low voltage DC input to a 160VPP AC output signal that drives the EL lamp.
The MIC4826 is comprised of two stages: a boost stage, and an H-bridge, lamp driver, stage. The boost stage steps the input voltage up to +80V. The H-bridge stage then alternately
switches the +80V output to each terminal of the EL lamp, thus creating a 160V PP AC signal to drive the EL lamp andgenerate light.
The MIC4826 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 MIC4826 uses a single inductor and a minimum number of external components, making it ideal for portable, space- sensitive applications. The MIC4826 is available in an 8-pin MSOP package with an ambient temperature range of 40°C to +85°C.
MIC4826 Data Sheet
