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| 型号： | MAX6948BGWA+T |
| 厂商： | Maxim Integrated |
| 文件页数： | 1/28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 |
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EVALUATION KIT AVAILABLE
MAX6948B
High-Efficiency PWM LED Driver with Boost
Converter and Five Constant-Current GPIO Ports
General Description
The MAX6948B general-purpose input/output (GPIO)
peripheral drives a series string of white LEDs (WLEDs),
and contains up to five general-purpose input/output
(GPIO) ports to drive additional LEDs.
The integrated 2MHz boost converter minimizes the size
and cost of external components and supplies 30mA of
load current at up to 28V. The converter is stable under
all load conditions from 5V up to 28V and includes
open-circuit detection to prevent damage to the IC. An
I 2 C-programmable 10-bit pulse-width modulation (PWM)
signal enables 1024 levels of WLED intensity.
The five GPIO ports function as logic inputs, open-
drain logic outputs, or constant-current sinks in any
combination. Ports withstand 5.5V independent of the
MAX6948B’s supply voltage. Two of the ports drive addi-
tional LEDs up to 30mA/port, while the other three ports
drive LEDs at up to 10mA/port. The MAX6948B features
shutdown and standby modes for low-power dissipa-
tion. The constant-current drivers contain programmable
PWM outputs and allow staggering to reduce the input
peak-current requirements. The I/O ports also feature
ramp-up and ramp-down controls.
The MAX6948B features a single input to select from four
I 2 C slave addresses. Programming and functionality for
the five GPIO ports is identical to the MAX6946/MAX6947
I/O expanders.
Features
S 28V Step-Up DC-DC Converter with Integrated
nMOS Power Switch
S Built-In 10-Bit PWM Control for Improved Efficiency
S No Discharge Path During PWM Off Period for
Increased Battery Life
S Fixed 2MHz Switching for Smaller Components
Drives up to 6 Series WLEDs
S ±8kV Human Body Model (HBM) ESD Protection
for GPIOs and Boost-Converter Output
S Five Open-Drain GPIOs Capable of Constant-
Current LED Drive with Individual 8-Bit PWM
Intensity Control
S 2.7V to 5V Power-Supply Operation
S 400kbps, 5.5V Tolerant I 2 C Interface
S Four I 2 C Slave Address Choices
S RST Input Clears Serial Interface and Exits
Shutdown (Reset-Run Option)
S Small (2.31mm x 2.31mm) WLP Package
Ordering Information
PART TEMP RANGE PIN-PACKAGE
MAX6948BGWA+ -40 N C to +105 N C 25 WLP
+ Denotes a lead(Pb)-free/RoHS-compliant package.
Typical Operating Circuit
The MAX6948B is available in a 25-bump (2.31mm x
2.31mm) WLP package for cell phones, PDAs, and
2.7V TO 5.0V
10 μ H
other portable consumer electronic applications. The
MAX6948B operates over the -40 N C to +105 N C tempera-
ture range.
2.2 F F
LX
OUT
0.22 F F
LED Backlighting for LCDs
Applications
V+ PGND
MAX6948B
SCL FB
R B
Cell Phones
PDAs
SDA
LEDSW
V EX T
Handheld Games
Portable Consumer Electronics
1.7V TO V+
RST
V DD
P0
P1
0.1 F F
COMP
P2
B
47nF
P3
G
AD0
GND
P4
R
NOTE: R B = 0.2V/I LED = 0.2V/0.03A = 6.7 I .
For pricing, delivery, and ordering information, please contact Maxim Direct
at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com.
19-4935; Rev 0; 9/09
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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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