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| 型号： | MAX8575EUT+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC CONV LCD BOOST SOT23-6 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 转换器，LCD |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 15V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-6 |
| 包装： | 带卷 (TR) |
High-Efficiency LCD Boost
with True Shutdown
Table 1. Protection Features
COMMON APPLICATION FAULTS
OUT to FB resistor missing or
disconnected.
Output cap missing and FB open.
FB shorted to GND.
Diode missing or disconnected.
Diode reverse polarity.
FB node open.
OUT shorted to ground.
RESULT WITH COMPETING
STEP-UP CONVERTERS
OUT voltage rises until the output
capacitor is destroyed and/or
downstream components are damaged.
OUT voltage rises until the output
capacitor is destroyed and/or
downstream components are damaged.
OUT voltage rises until the output
capacitor is destroyed and/or
downstream components are damaged.
Inductor energy forces LX node high,
possibly damaging the internal switch.
Unpredictable, possibly boosting output
voltage beyond acceptable design
range.
Current ramps up through inductor and
diode, generally destroying one of the
RESULT WITH MAX8570 FAMILY
Converter stops switching.
LX may boost one or two times before the FB
voltage exceeds the trip point. In the rare case
where the capacitive loading and external
loading on OUT is small enough that the energy
in one cycle can slew it more than 50V, the
internal MOSFET will clamp between 35V and
70V (nondestructively).
Converter stops switching and OUT is resistively
loaded to GND.
OUT is resistively loaded to GND and the
converter stops switching.
FB node driven above its regulation point, the
converter stops switching, and OUT is resistively
loaded to GND.
True off-switch detects short, opens when
current reaches pMOS current limit, and restarts
devices.
Design Procedure
Inductor Selection
Smaller inductance values typically offer smaller physi-
cal size for a given series resistance or saturation cur-
rent. Circuits using larger inductance values may
provide more output power. The inductor’s saturation
current rating should be greater than the peak switch-
ing current. Recommended inductor values range from
10μH to 100μH.
Selecting the Current Limit
The peak LX current limit (I LX(MAX) ) required for the
application is calculated from the following equation:
soft-start. This protects the inductor and diode.
value. See the Selector Guide on page 1 for selecting
the IC with the correct current limit.
Diode Selection
The high switching frequency of up to 800kHz requires
a high-speed rectifier. Schottky diodes are recom-
mended due to their low forward-voltage drop. To
maintain high efficiency, the average current rating of
the diode should be greater than the peak switching
current. Choose a reverse breakdown voltage greater
than the output voltage.
Capacitors
Small ceramic surface-mount capacitors with X7R or
X5R temperature characteristics are recommended
due to their small size, low cost, low equivalent series
P OUT ( MAX ) ?
I LX ( MAX ) ≥ 1 . 25 ×
P OUT ( MAX )
V BATT ( MIN )
?
+ ? 1 . 25 ×
?
2
? + 3 μ s ×
V BATT ( MIN ) ?
P OUT ( MAX )
L
resistance (ESR), and low equivalent series inductance
(ESL). If nonceramic capacitors are used, it is important
that they have low ESR to reduce the output ripple volt-
age and peak-peak load-transient voltage.
where P OUT(MAX) is the maximum output power
required by the load and V BATT(MIN) is the minimum
supply voltage used to supply the inductor (this is V CC
unless a separate supply is used for the inductor). The
IC current limit must be greater than this calculated
For most applications, use a 1μF ceramic capacitor for
the output and V CC bypass capacitors. For SW or the
inductor supply, a 4.7μF or greater ceramic capacitor
is recommended.
8
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相关代理商/技术参数 |
参数描述 |
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| MAX8576EUB | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8576EUB+ | 功能描述:DC/DC 开关控制器 3-28V Hystrtic Synch Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8576EUB+T | 功能描述:DC/DC 开关控制器 3-28V Hystrtic Synch Step-Down Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8576EUB-T | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX8576EVKIT | 功能描述:DC/DC 开关控制器 MAX8576 Evaluation Kit RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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