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参数资料
| 型号： | MAX6967ATE+ |
| 厂商： | Maxim Integrated |
| 文件页数： | 25/29页 |
| 文件大小： | 0K |
| 描述： | IC LED DRIVER LINEAR 16-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 恒定电流： | 是 |
| 拓扑： | 开路漏极，PWM |
| 输出数： | 10 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 270kHz ~ 450kHz |
| 电源电压： | 2.25 V ~ 3.6 V |
| 输出电压： | 7V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN（3x3） |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 125°C |
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MAX6966/MAX6967
10-Port Constant-Current LED Drivers and I/O
Expanders with PWM Intensity Control
Figure 13 shows the typical current sunk by a LITEON
LTST-C170TBKT 3.0V blue LED as the LED supply volt-
age is varied from 2.5V to 7V. The LED currents shown
are for ports programmed for 10mA and 20mA constant
current, swept over a 2.5V to 7V LED supply voltage
range. It can be seen that the LED forward voltage falls
with current, allowing the LED current to fall gracefully,
not abruptly, in brownout. In practice, the LED current
drops to 6mA to 7mA at a 3V LED supply voltage,
which is an acceptable performance at end-of-life in
many backlight applications.
Output Level Translation
The open-drain output architecture allows the ports to
level translate the outputs to higher or lower voltages
than the MAX6966/MAX6967 supply. An external pullup
resistor can be used on any output to convert the high-
impedance logic-high condition to a positive voltage
level. The resistor can be connected to any voltage up
to 7V. When using a pullup on a constant-current out-
put, select the resistor value to sink no more than a few
hundred μA in logic-low condition. This ensures that the
current sink output saturates close to GND. For inter-
facing CMOS inputs, a pullup resistor value of 220k ? is
a good starting point. Use a lower resistance to
improve noise immunity in applications where power
consumption is less critical, or where a faster rise time
is needed for a given capacitive load.
VLED vs. VLED SUPPLY
3.05
3.00
2.95
2.90
2.85
2.80
2.75
2.70
2.65
2.60
2.55
2.50
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
VLED SUPPLY (V)
Figure 13. LED Brownout
Maxim Integrated
Using Stagger with Fewer Ports
The stagger option, when selected, applies to all ports
configured as constant-current outputs. The 10 ports’
PWM cycles are separated to eight evenly spaced start
positions ( Figure 3). This phasing can be optimized if
fewer than 10 ports are used as constant-current out-
puts by allocating the ports with the most appropriate
start positions. If eight constant-current outputs are
needed, choose P0–P7 because these all have differ-
ent PWM start positions. If four constant-current outputs
are needed, choose P0, P2, P4, P6 or P1, P3, P5, P7
because the PWM start positions are evenly spaced. In
general, choose the ports that spread the PWM start
positions as evenly as possible. This optimally spreads
out the current demand from the ports’ load supply.
Generating a Shutdown/Run Output
An I/O port can be used to automatically generate a
shutdown/run output from the MAX6966/MAX6967. The
shutdown/run output is active low when the
MAX6966/MAX6967 are in run mode, hold-off, fade-off,
or ramp-up, and go high automatically when the
MAX6966/MAX6967 finally enter shutdown after fade-
off. Program the port’s output register to value 0x00,
which puts the output into static constant-current mode
( Table 6). Program the port’s output current register to
half current ( Table 7) to minimize operating current. Fit
a 220k ? pullup resistor to this port.
ILED vs. VLED SUPPLY
20
18
16
14
12
10
8
6
4
2
0
2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0 6.5 7.0
VLED SUPPLY (V)
25
相关PDF资料 |
PDF描述 |
|---|---|
| MAX6968AAE+ | IC LED DRIVER LINEAR 16-SSOP |
| MAX6970AUE+ | IC LED DRIVER LINEAR 16-TSSOP |
| MAX6971AUG+T | IC LED DRIVER LINEAR 24-TSSOP |
| MAX6974ATL+ | IC LED DRIVER LINEAR 40-TQFN |
| MAX6977AAE+ | IC LED DRIVER LINEAR 16-SSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX6967ATE+ | 功能描述:LED显示驱动器 10-Port Constant Current LED Driver RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| MAX6967ATE+T | 功能描述:LED显示驱动器 10-Port Constant Current LED Driver RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| MAX6967ATE-T | 功能描述:LED显示驱动器 10-Port Constant Current LED Driver RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| MAX6968AAE | 功能描述:LED显示驱动器 8-Port 5.5V Constant Current LED Driver RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
| MAX6968AAE+ | 功能描述:LED显示驱动器 8-Port 5.5V Constant Current LED Driver RoHS:否 制造商:Micrel 数位数量:5 片段数量: 安装风格:SMD/SMT 封装 / 箱体:PLCC-44 工作电源电压:4.75 V to 11 V 最大电源电流:10 mA 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装:Tube |
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