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参数资料
型号： MAX6948BGWA+T
厂商： Maxim Integrated
文件页数： 27/28页
文件大小： 0K
描述： IC LED DVR PWM GPIO 25WLP
产品培训模块： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
标准包装： 2,500
恒定电流： 是
拓扑： 开路漏极，PWM，升压（升压）
输出数： 6
内部驱动器： 是
类型 - 主要： 背光
类型 - 次要： 白色 LED
频率： 2MHz
电源电压： 2.7 V ~ 5 V
输出电压： 28V
安装类型： 表面贴装
封装/外壳： 25-WFBGA，WLCSP
供应商设备封装： 25-WLP（2.09x2.09）
包装： 带卷 (TR)
工作温度： -40°C ~ 105°C
MAX6948B
High-Efficiency PWM LED Driver with Boost
Converter and Five Constant-Current GPIO Ports
The MAX6948B can use an I/O port to automatically gen-
erate a shutdown/run output. The shutdown/run output is
active-low when the MAX6948B is in run mode, hold-off,
ramp-down, or ramp-up, and goes high automatically
when the device finally enters shutdown after ramp-
down. Programming the port’s output register to value
0x02 puts the output into static constant-current mode
(Table 7). Program the port’s output current to half cur-
rent (Table 9) to minimize operating current. Connect a
220k I pullup resistor to this port.
In run mode, the output port goes low, approaching 0V,
as the port’s static constant current saturates trying to
sink a higher current than the 220k I pullup resistor can
source.
In shutdown mode, the output goes high impedance
together with any other constant-current outputs. This
output remains low during ramp-up and ramp-down
sequences because the current drawn by the 220k I
pullup resistor is much smaller than the available output
constant current, even at the lowest fade-current step.
Driving Load Currents Higher than 30mA
The MAX6948B can drive loads needing more than
30mA, like high-current white LEDs, by paralleling out-
puts. For example, consider a white LED that requires
90mA. Drive this LED using the ports P0–P4 connected
in parallel (shorted together). Configure all of the five
ports for full current (2 x 30mA + 3 x 10mA) to meet the
90mA requirement. Control the five ports simultaneously
Maxim Integrated
with one write access using register 0x0C (Table 1).
Note that because the output ports are current limiting,
they do not need to switch simultaneously to ensure safe
current sharing.
Power-Supply Considerations
V+ operates with a 2.7V to 5.5V power-supply voltage.
Bypass V+ to GND with a 2.2 F F or higher ceramic
capacitor as close as possible to the device. V DD oper-
ates with a 1.7V to V+ power-supply voltage. Bypass
V DD to GND with a 0.1 F F or higher ceramic capacitor as
close as possible to the device.
PCB Layout Considerations
Due to fast switching waveforms and high-current paths,
careful PCB layout is required. Minimize trace lengths
between the IC and the inductor, the diode, the input
capacitor, and the output capacitor. Minimize trace
lengths between the input and output capacitors and
the MAX6948B GND terminal, and place input and
output capacitor grounds as close together as pos-
sible. Use separate power-ground and analog-ground
copper areas, and connect them together at the output-
capacitor ground. Keep traces short, direct, and wide.
Keep noisy traces, such as the LX node trace, away from
sensitive analog circuitry. For improved thermal per-
formance, maximize copper area of the LX and PGND
traces. Refer to the MAX6948B EV kit data sheet for an
example layout.
27
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MAX694C/D 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel
MAX694CPA 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel
MAX694CPA+ 功能描述:监控电路 MPU Supervisor RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel
MAX694EJA 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel
MAX694EPA 功能描述:监控电路 RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel
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