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| 型号： | MAX8717ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 16/30页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR PWR SUP 28-TQFN |
| 标准包装： | 2,500 |
| 应用： | 控制器，笔记本电脑电源系统 |
| 输入电压： | 4 V ~ 26 V |
| 输出数： | 2 |
| 输出电压： | 3.3V，5V，1 V ~ 5.5 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-WFQFN 裸露焊盘 |
| 供应商设备封装： | 28-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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Interleaved High-Efficiency, Dual Power-Supply
Controllers for Notebook Computers
Fixed-Frequency,
Current-Mode PWM Controller
The heart of each current-mode PWM controller is a
multi-input, open-loop comparator that sums two sig-
nals: the output-voltage error signal with respect to the
reference voltage and the slope-compensation
ramp (Figure 3). The MAX8716/MAX8717/MAX8756/
MAX8757 use a direct-summing configuration,
approaching ideal cycle-to-cycle control over the out-
put voltage without a traditional error amplifier and the
phase shift associated with it. The MAX8716/MAX8717/
MAX8756/MAX8757 use a relatively low loop gain,
allowing the use of low-cost output capacitors. The low
loop gain results in the 0.1% typical load-regulation
error and helps reduce the output capacitor size and
cost by shifting the unity-gain crossover frequency to a
Frequency Selection (FSEL)
The FSEL input selects the PWM mode switching fre-
quency. Table 3 shows the switching frequency based
on the FSEL connection. High-frequency operation opti-
mizes the application for the smallest component size,
trading off efficiency due to higher switching losses.
This may be acceptable in ultra-portable devices where
the load currents are lower. Low-frequency operation
offers the best overall efficiency at the expense of com-
ponent size and board space.
Forced-PWM Mode
To maintain low ripple fixed-frequency operation, drive
SKIP_ high to put the output into forced-PWM mode.
This disables the zero-crossing comparator and allows
negative inductor current. During forced-PWM mode,
lower level.
FB
CSH
(0.05 x V LIMIT FOR MAX8756)
REF / 2
CSL
0.1 x V LIMIT
0.2 x V LIMIT
SLOPE COMP
SOFT-START
SOFT-STOP
ON
AGND
R
SKIP
DECODE
S
Q
DH DRIVER
SKIP
V LIMIT
OSC
-1.2 x V LIMIT
S
R
Q
DL DRIVER
3mV
Figure 3. PWM-Controller Functional Diagram
16
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8717EVKIT | 制造商:Maxim Integrated Products 功能描述:HIGH-EFFICIENCY DUAL POWER-SUPPLY - Rail/Tube |
| MAX8718ETA | 制造商:Maxim Integrated Products 功能描述:HIGH-VOLTAGE LOW-POWER LINEAR REGU - Rail/Tube |
| MAX8718ETA+ | 制造商:Maxim Integrated Products 功能描述: |
| MAX8718ETA-T | 功能描述:低压差稳压器 - LDO 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 |
| MAX8719ETA | 制造商:Maxim Integrated Products 功能描述:HIGH-VOLTAGE LOW-POWER LINEAR REGU - Rail/Tube |
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