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8-String White LED Driver with
SMBus for LCD Panel Applications
The MAX17061 includes a 5V linear regulator that pro-
vides the internal bias and gate drive for the step-up
controller. When an external 5V is available, the internal
LDO can be overdriven to decrease power dissipation.
Otherwise, connect the IN pin to an input greater than 5.5V.
Fixed-Frequency Step-Up Controller
The MAX17061’s fixed-frequency, current-mode, step-
up controller automatically chooses the lowest active
FB_ voltage to regulate the output voltage. Specifically,
the difference between the lowest FB_ voltage and the
current-source control signal plus an offset (VSAT) is
integrated at the CCV output. The resulting error signal
is compared to the external switch current plus slope
compensation to determine the switch on-time. As the
load changes, the error amplifier sources or sinks cur-
rent to the CCV output to deliver the required peak-
inductor current. The slope-compensation signal is
added to the current-sense signal to improve stability at
high duty cycles.
When the input voltage is close to the output voltage, the
MAX17061 automatically skips pulses to prevent over-
charging the output capacitor. In SKIP mode, the induc-
tor current ramps up for a minimum on-time of
approximately 90ns, and then discharges the stored
energy to the output. The switch remains off until another
pulse is needed to boost the output voltage.
Internal 5V Linear Regulator
V CC and UVLO
The MAX17061 includes an internal low-dropout linear
regulator (V CC ). When V IN is higher than 5.5V, this lin-
ear regulator generates a 5V supply to power internal
PWM controller, control logic, and MOSFET driver. The
V CC voltage drops to 4.35V in shutdown. If V IN is less
than or equal to 5.5V, V CC and IN can be tied together
and powered from an external 5V supply. There is an
internal diode from V CC to IN, so V IN must be greater
than V CC (see Figure 3).
V IN
7V TO 21V
4.7 μ F
1 μ F
0.1 μ F
V DD
V CC
OSC
ISET
IN
L1
10 μ H
LX1
LX2
PGND1
D1
2 μ F
C OUT
V OUT
UP TO 45V
464k Ω
5.1k Ω
220pF
FSET
CCV
MAX17061
PGND2
OV
R1
2.21M Ω
PWM
0.022 μ F
PWMI
R2
61.9k Ω
1 μ F
PWMO
FB1
FB2
FB3
FB4
CLK
SCL
FB5
DATA
SDA
GND
FB6
FB7
FB8
V CC
EP
Figure 1. Typical Operating Circuit
12
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相关代理商/技术参数
MAX17061EVCMAXQU+
功能描述:LED 照明开发工具 Evaluation Kit/Evaluation System for the MAX17061 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:
MAX17061EVKIT+
功能描述:LED 照明开发工具 MAX17061 Eval Kit 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:
MAX17062ETB+
制造商:Maxim Integrated Products 功能描述: 制造商:Maxim Integrated Products 功能描述:TFT-LCD STEP-UP DC-DC CONVERTER - Rail/Tube
MAX17062ETB+T
功能描述:直流/直流开关转换器 TFT-LCD Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT
MAX17062EVKIT
功能描述:电源管理IC开发工具 MAX17062 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
MAX17062EVKIT+
功能描述:电源管理IC开发工具 MAX17062 Eval Kit RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V
MAX17065ETI+
功能描述:直流/直流开关转换器 TFT-LCD Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT
MAX17065ETI+T
功能描述:直流/直流开关转换器 TFT-LCD Step-Up DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT
