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| 型号： | MAX8727ETB+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/13页 |
| 文件大小： | 0K |
| 描述： | IC DC/DC CONV TFT-LCD 10-TDFN |
| 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，TFT，LCD |
| 输入电压： | 2.6 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 2.6 V ~ 24 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 供应商设备封装： | 10-TDFN-EP（3x3） |
| 包装： | 带卷 (TR) |
TFT-LCD Step-Up DC-DC Converter
SHDN
SKIP
COMPARATOR
4 μ A
IN
BIAS
COMP
SKIP
SOFT-
START
SS
ERROR
FB
1.24V
AMPLIFIER
∞
ERROR
COMPARATOR
CONTROL
AND DRIVER
N
LX
LOGIC
CLOCK
GND
FREQ
OSCILLATOR
SLOPE
COMPEN-
SATION
Σ
CURRENT
SENSE
5 μ A
Figure 2. MAX8727 Functional Diagram
Detailed Description
The MAX8727 is a highly efficient power supply that
employs a current-mode, fixed-frequency, pulse-width
modulation (PWM) architecture for fast transient
response and low-noise operation. The device regu-
lates the output voltage through a combination of an
error amplifier, two comparators, and several signal
generators (Figure 2). The error amplifier compares the
signal at FB to 1.24V and varies the COMP output. The
voltage at COMP determines the current trip point each
time the internal MOSFET turns on. As the load
MAX8727
current limit depends on the duty cycle. The current
limit is determined by the following equation:
I LIM = (1.26 - 0.35 x D) x I LIM_EC
where I LIM _ EC is the current limit specified at 75% duty
cycle (see the Electrical Characteristics ) and D is the
duty cycle.
The output current capability depends on the current-
limit value and is governed by the following equation:
0 . 5 × D × V IN ? V IN
changes, the error amplifier sources or sinks current to
the COMP output to command the inductor peak cur-
rent necessary to service the load. To maintain stability
at high duty cycles, a slope-compensation signal is
?
I OUT ( MAX ) = ? I LIM ?
? ?
?
f OSC × L ? V OUT
? × × η
summed with the current-sense signal.
At light loads, this architecture allows the MAX8727 to
“skip” cycles to prevent overcharging the output voltage.
In this region of operation, the inductor ramps up to a
where I LIM is the current limit calculated above, η is the
regulator efficiency (85% nominal), and D is the duty
cycle. The duty cycle when operating at the current
limit is:
peak value of approximately 50mA, discharges to the
output, and waits until another pulse is needed again.
Output Current Capability
D =
V OUT ? I LIM × R ON + V DIODE
V OUT ? V IN + V DIODE
The output current capability of the MAX8727 is a func-
tion of current limit, input voltage, operating frequency,
and inductor value. Because of the slope compensa-
tion used to stabilize the feedback loop, the inductor
where V DIODE is the rectifier diode forward voltage and
R ON is the on-resistance of the internal MOSFET.
_______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8727EUB+ | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube |
| MAX8727EVKIT | 功能描述:电源管理IC开发工具 MAX8727 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 |
| MAX8728ETJ | 功能描述:LCD 驱动器 RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
| MAX8728ETJ+ | 功能描述:直流/直流开关调节器 Power Supply for LCD/TV RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MAX8728ETJ+T | 功能描述:LCD 驱动器 Power Supply for LCD/TV RoHS:否 制造商:Maxim Integrated 数位数量:4.5 片段数量:30 最大时钟频率:19 KHz 工作电源电压:3 V to 3.6 V 最大工作温度:+ 85 C 最小工作温度:- 20 C 封装 / 箱体:PDIP-40 封装:Tube |
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