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Highest Efficiency Supply for 2 to 6
Series WLEDs in a 2mm x 2mm TDFN Package
MAX8901A
THERMAL
REF
GND
SHUTDOWN
INTERNAL
750kHz OSC
SHUTDOWN
TIMER
Gm
BOOST
CONTROL
LOGIC
D*0.5V
IC
POWER
IN
LX
PGND
OVP
CS
PWM
COMP
ON
EP
Figure 2. MAX8901A Block Diagram
Detailed Description
The high efficiency and tiny size of the MAX8901A/
MAX8901B WLED step-up converters make them ideally
suited for driving LCD backlighting in cell phones, PDAs,
and other portable and handheld devices. The
MAX8901_ drive from 2 to 6 series-connected WLEDs
with constant current for uniform WLED intensity and are
optimized for the highest possible efficiency (up to 91%)
over the full 1-cell Li+/Li-Poly battery range. These tiny
2mm x 2mm devices operate at a constant 750kHz
switching frequency, and use small external components
to achieve minimal input and output ripple while occupy-
ing the smallest possible footprint.
These converters use a single input (ON) to enable the IC
and to control WLED intensity. The MAX8901A requires a
direct PWM input to modulate WLED intensity, with WLED
current proportional to the PWM duty cycle. The
MAX8901B uses single-wire, serial-pulse dimming that
reduces the WLED intensity in 32 equal steps. Full-scale
WLED current for serial-pulse dimming is 24.75mA.
8
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相关代理商/技术参数
MAX8901EVKIT+ 功能描述:LED 照明开发工具 Evaluation Kit for the MAX8901A and MAX8901B RoHS:否 制造商:Fairchild Semiconductor 产品:Evaluation Kits 用于:FL7732 核心: 电源电压:120V 系列: 封装:
MAX8902AATA+ 制造商:Maxim Integrated Products 功能描述:LDO REGULATORS 制造商:Maxim Integrated Products 功能描述:LOW-NOISE 500MA LDO REGULATORS IN A 2MM X 2MM TDFN PACKAGE - Bulk
MAX8902AATA+T 功能描述:低压差稳压器 - LDO 500mA LDO Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20
MAX8902AATAT 制造商:MAXIM/DALLAS 功能描述:
MAX8902BATA/V+ 制造商:Maxim Integrated Products 功能描述:LOW-NOISE 500MA LDO REGULATORS IN A 2MM X 2MM TDFN PACKAGE - Rail/Tube
MAX8902BATA/V+T 功能描述:低压差稳压器 - LDO 150mA LDO Linear Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20
MAX8902BATA+ 制造商:Maxim Integrated Products 功能描述:LOW-NOISE 500MA LDO REGULATORS IN A 2MM X 2MM TDFN PACKAGE - Rail/Tube
MAX8902BATA+T 功能描述:低压差稳压器 - LDO 500mA LDO Regulator RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20