Datasheet > MAX20070B

MAX20070B

更新时间： 2024-11-17 02:52:55

品牌	Logo	应用领域
美信 - MAXIM		/
页数	文件大小	规格书
13页	572K
描述
2.7V to 5.5V Input Range for TFT Power Section

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中文翻译

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数据手册

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MAX20070B 数据手册

Evaluates: MAX20070/MAX20070B

MAX20070 Evaluation Kit

General Description

Features

The MAX20070 evaluation kit (EV kit) demonstrates

the MAX20070 IC, which is a highly integrated power

supply plus LED backlight driver for automotive TFT-LCD

applications. The EV kit is a fully assembled and tested

surface-mount PCB that provides a complete power-

management solution for small-size automotive displays.

The EV kit demonstrates one buck-boost converter, one

boost converter, two gate-voltage controllers, and a boost

converter that powers a dual-string LED driver.

● 2.7V to 5.5V Input Range for TFT Power Section

● 4.5V to 16V Input Range for LED Driver Section

● 1MHz Boost and Inverted Buck-Boost Switching

Frequency on TFT Power Section

● TFT Section Output Voltages

• +6.5V Output at 100mA (Step-Up Switching

Regulator)

• -6.5V Output at 100mA (Inverting Buck-Boost

Switching Regulator)

• +16V Output at 3mA (Positive-Charge Pump)

• -7V Output at 3mA (Negative-Charge Pump)

The DC-DC converter portion of the EV kit operates

from a 2.7V to 5.5V DC supply voltage. The step-up

switching regulator (POS) is conﬁgured for a 6.5V or 15V

output that provides 100mA. The inverting buck-boost

converter (NEG) generates a negative output that tracks

the positive output and provides 100mA. The gate-driver

power supplies consist of regulated charge pumps that

generate +16V (GVDD) and -7V (GVEE) and can deliver

up to 3mA each. It is also possible to completely turn off

the inverting buck-boost regulator by changing the value

of the R15 resistor to 140kΩ.

● HB LED String Output Currents Configurable for

80mA or 160mA

● Demonstrates Cycle-by-Cycle Current-Limit and

Thermal-Shutdown Features on Boost LED Driver

● Demonstrates Adaptive Voltage Optimization on LED

Driver Section

● Proven PCB Layout and Thermal Design

● Fully Assembled and Tested

The LED driver section demonstrates a step-up DC-DC

preregulator followed by two channels of linear current

sinks. The step-up preregulator switches at 1MHz and

operates as a current-mode-controlled regulator capable

of providing up to 300mA for the linear circuits. Each

channel is capable of operating up to 38V and provides

up to 160mA. The channels are conﬁgurable for 80mA or

160mA HB LED output current.

Ordering Information appears at end of data sheet.

The LED driver portion of the EV kit operates from a DC

supply voltage of 4.5V up to the HB LED string-forward

voltage. The EV kit can withstand a 40V load-dump condi-

tion. The EV kit also demonstrates the IC’s features, such

as adaptive voltage optimization, overvoltage protection

(OVP), cycle-by-cycle current limit, thermal shutdown,

and digital PWM dimming operation using a digital PWM

input signal to control the brightness of the HB LEDs.

The EV kit is shipped with the MAX20070, but can also

be used to evaluate the MAX20070B with IC replacement

of U1.

19-7549; Rev 1; 9/15

12 3 4 5 6 7...13

中文翻译

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与MAX20070B相关器件

型号	品牌	获取价格	描述	数据表
MAX20070BGTJA/V+	MAXIM	获取价格	LED Driver,
MAX20070EVKIT	MAXIM	获取价格	2.7V to 5.5V Input Range for TFT Power Section
MAX20071	ADI	获取价格	Single 600mA/1A 2.2MHz Low-Voltage Step-Down DC-DC Converter
MAX20072	ADI	获取价格	Single 600mA/1A 2.2MHz Low-Voltage Step-Down DC-DC Converter
MAX20073	MAXIM	获取价格	Single 2A/3A 2.2MHz Low-Voltage Step-Down DC-DC Converters
MAX20073	ADI	获取价格	单通道、2A/3A、2.2MHz、低电压、降压型DC-DC转换器
MAX20073ATBA/V+	MAXIM	获取价格	Switching Regulator/Controller,
MAX20073ATBAV	MAXIM	获取价格	Single 2A/3A 2.2MHz Low-Voltage Step-Down DC-DC Converters
MAX20073ATBBV	MAXIM	获取价格	Single 2A/3A 2.2MHz Low-Voltage Step-Down DC-DC Converters
MAX20073EVKIT	MAXIM	获取价格	2.7V to 5.5V Input Voltage Range

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