参数资料
型号: MAX8834YEWP+T
厂商: Maxim Integrated
文件页数: 16/44页
文件大小: 0K
描述: IC LED DRIVR BCKLGT FLASH 20-WLP
产品培训模块: Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装: 2,500
拓扑: 线性(LDO),低端,PWM,升压(升压)
输出数: 3
内部驱动器:
类型 - 主要: 闪灯/白光
类型 - 次要: 白色 LED
频率: 1.8MHz ~ 2.2MHz
电源电压: 2.5 V ~ 5.5 V
输出电压: 5.5V
安装类型: 表面贴装
封装/外壳: 20-WFBGA,WLBGA
供应商设备封装: 20-WLP
包装: 带卷 (TR)
工作温度: -40°C ~ 85°C
MAX8834Y/MAX8834Z
Adaptive Step-Up Converters
with 1.5A Flash Driver
GSMB EVENT
GSMB (ACTIVE-HIGH)
INPUT CURRENT
PREDEFINED INPUT CURRENT
LIMIT DURING GSMB
FLED1/FLED2 DECREASED ONE
LSB SINCE I IN > I LIM[3:0]
FLED1/FLED2 INCREASED
ONE LSB SINCE I IN < I LIM[3:0]
FLED2 OUTPUT
CURRENT
FLED1 OUTPUT
CURRENT
FLASH1_CUR
SETTING
TIME
1 μ s AFTER GSMB
ACTIVATED, FLED_ GOES
TO THE MINIMUM SETTING
Figure 10. Input Current Limit During GSMB Event
HC_TMR[1:0]
1 μ s AFTER GSMB
DEACTIVATED, FLED_ GOES
TO THE PREVIOUS SETTING
GSM Blank Function (GSMB)
The GSMB input is provided to allow the flash current to
be momentarily reduced during a GSM transmit to
reduce the peak current drawn from the battery. The
input current limit ensures that the maximum possible
output current is always provided, regardless of the
input voltage and the LED forward voltages.
When a GSMB event is triggered, the FLED1 and
FLED2 current regulators go to the lowest setting to
ensure the current drawn from the battery is quickly
reduced to a safe level. The MAX8834Y/MAX8834Z
16
then start increasing the FLED1 and FLED2 current by
one LSB steps, at a time interval set by HC_TMR[1:0]
(see Table 11). The increasing continues until either the
predefined FLED1/FLED2 current setting is reached or
the input current exceeds the maximum predefined
input current limit during a GSMB event. When the input
current exceeds the predefined input current limit, the
FLED1/FLED2 current is reduced by one LSB. The
MAX8834Y/MAX8834Z continue to adjust the FLED1
and FLED2 up and down depending on the input cur-
rent limit as long as the GSMB event is present. See
Figure 10 for more detailed information.
Maxim Integrated
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