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MAX8834Y/MAX8834Z
Adaptive Step-Up Converters
with 1.5A Flash Driver
I INDLED = FULL SCALE
128ms
256ms
512ms
1024ms
I INDLED = 1/2 SCALE
0mA
Figure 5. Ramp-Up Behavior
I INDLED = FULL SCALE
I INDLED = 1/2 SCALE
0mA
128ms
256ms
512ms
1024ms
Figure 6. Ramp-Down Behavior
t IND_OFF
t IND_ON
t IND_OFF
t IND_ON
t IND_OFF
I IND_LED = IND_LED[4:0]
I IND_LED = CODE 0111
I IND_LED = CODE 0011
I IND_LED = OFF
t=
t IND_RU
32
t=
t IND_RD
32
Figure 7. Combining RAMP Function and Blink Timer
t IND _ ON ≥
( IND _ LED + 1 )
t IND _ OFF ≥
( IND _ LED + 1 )
programmed current not being reached during the ON
time, or the INDLED current not returning to 0mA during
the OFF time. See Figure 7.
t IND _ RU
32
t IND _ RD
32
where IND_LED is the code from 0 to 31 specified in
the IND_LED[4:0].
LED Enable Input (LED_EN)
The LED_EN logic input can enable/disable the FLED1,
FLED2, and INDLED current regulators. It can be
programmed to control movie mode, flash mode, and
indicator mode by using the IND_EN, MOVIE_EN,
and FLASH_EN bits, respectively. See Table 8 for
more information.
14
If FLED1/FLED2 is enabled for both movie and flash
modes at the same time, flash mode has priority. Once
the safety timer expires, the current regulator then
returns to the movie mode.
Watchdog Timer
The MAX8834Y/MAX8834Z include a watchdog timer
function that can be programmed using the I 2 C inter-
face from 4 seconds to 16 seconds with a 4-second
step. If the watchdog timer expires, the MAX8834Y/
MAX8834Z interpret it as an indication that the system
is no longer responding and enters safe mode. In safe
mode, the MAX8834Y/MAX8834Z disable all current
regulators and the step-up DC-DC converter to prevent
potential damage to the system. The I 2 C setting for the
respective registers does not change, therefore, reset-
ting the watchdog timer reverts the MAX8834Y/
MAX8834Z back to the state present before entering
safe mode.
Maxim Integrated
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MAX8836ZEREEE+T
功能描述:电流型 PWM 控制器 1.2A PWM Step-Down Converter RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14
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