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MAX8834/MAX8834Y/MAX8834Z,pdf
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2009-10-10
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The MAX8834Y/MAX8834Z flash drivers integrate a
1.5A PWM DC-DC step-up converter and three programmable
low-side, low-dropout LED current regulators.
The step-up converter features an internal
switching MOSFET and synchronous rectifier to
improve efficiency and minimize external component
count. An I2C interface provides flexible control of stepup
converter output voltage setting, movie/flash mode
selection, flash timer duration settings, and current regulator
settings. The MAX8834Y/MAX8834Z operate
down to 2.5V, making them future proof for new battery
technologies.
The MAX8834Y/MAX8834Z consist of two current regulators
for the flash/movie mode. Each current regulator can
sink 750mA in flash mode and 125mA in movie mode.
The MAX8834Y/MAX8834Z also integrate a 16mA lowcurrent
regulator that can be used to indicate camera
status. The indicator current regulator includes programmable
ramp and blink timer settings. A programmable
input current limit, invoked using the GSMB control,
reduces the total current drawn from the battery during
PA transmit events. This ensures the flash current is set
to the maximum possible for any given operating condition.
Additionally, the MAX8834Y/MAX8834Z include a
MAXFLASH* function that adaptively reduces flash current
during low battery conditions to help prevent system
undervoltage lockup.
1.5A PWM DC-DC step-up converter and three programmable
low-side, low-dropout LED current regulators.
The step-up converter features an internal
switching MOSFET and synchronous rectifier to
improve efficiency and minimize external component
count. An I2C interface provides flexible control of stepup
converter output voltage setting, movie/flash mode
selection, flash timer duration settings, and current regulator
settings. The MAX8834Y/MAX8834Z operate
down to 2.5V, making them future proof for new battery
technologies.
The MAX8834Y/MAX8834Z consist of two current regulators
for the flash/movie mode. Each current regulator can
sink 750mA in flash mode and 125mA in movie mode.
The MAX8834Y/MAX8834Z also integrate a 16mA lowcurrent
regulator that can be used to indicate camera
status. The indicator current regulator includes programmable
ramp and blink timer settings. A programmable
input current limit, invoked using the GSMB control,
reduces the total current drawn from the battery during
PA transmit events. This ensures the flash current is set
to the maximum possible for any given operating condition.
Additionally, the MAX8834Y/MAX8834Z include a
MAXFLASH* function that adaptively reduces flash current
during low battery conditions to help prevent system
undervoltage lockup.
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