Summary:
The MAX1578 provides four regulated outputs for all voltage requirements of small active matrix TFT-LCD displays used in handheld devices where minimal external components and high efficiency are required. Each device contains three advanced charge pumps for LCD bias supplies, and a boost converter that can drive up to eight series white LEDs for backlighting. The input voltage range is 2.7V to 5.5V.
The charge pump provides fixed +5V, +15V, and -10V voltages to the LCD bias circuit, eliminating the need for an external diode. An efficient, fractional (1.5x/2x) charge pump is followed by a low dropout linear regulator that supplies +5V to the source driver. Automatic mode switching achieves the highest conversion efficiency. Two multistage, high voltage charge pumps generate +15V and -10V to provide VON and VOFF. With a unique clocking scheme and internal drivers, these charge pumps eliminate parasitic charging current pulse interference and reduce the maximum input current, thus ensuring very low electromagnetic emissions. Sequential output is achieved at startup and shutdown. When turned off, the output is discharged to zero.
Key characteristics
Four regulators in one package
Bias supply uses a charge pump
25mA, +5V for source driver
100μA, +15V for VON
100μA, -10V for VOFF
No need for external diode sequential output
POS, NEG, and MAIN are automatically discharged when turned off
LED backlight power supply uses boost converter series LED connection to achieve uniform illumination
Supports up to 8 LEDs at 25mA current (max)
900mW (max) output power
PWM or analog brightness control overvoltage protection low input/output ripple voltage soft start without surge current
1MHz fast PWM operation with small size component cooling (MAX1579)
High efficiency bias: 83% (5.0V output 25mA current, 15V/-10V output 100μA current)
LED: 84% (6 LEDs at 20mA)
Use only ceramic capacitors and an inductor
Independent LED and bias supply enable input
Thermal shutdown protection
1μA shutdown current
Tiny 4mm x 4mm thin QFN package
Application field
Internet application
LCD display with white LED backlight
PDA, PDA
smartphone
Typical application circuit
For more information on related devices, please see: http://
The MAX1578 data sheet can be found in the PDF document (click on the PDF file to download)
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