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| 型号： | MAX8717ETI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/30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
INPUT (V IN )
DH_
LX_
N H
C IN
L
R SENSE
MAX8716
MAX8717
DL_
N L
D L
C OUT
MAX8756 PGND
MAX8757
CSH_
CSL_
a) OUTPUT SERIES RESISTOR SENSING
INPUT (V IN )
DH_
N H
C IN
INDUCTOR
LX_
MAX8716 DL_
MAX8717
MAX8756 PGND
N L
D L
R EQ
C EQ
C OUT
MAX8757
CSH_
CSL_
b) LOSSLESS INDUCTOR SENSING
Figure 8. Current-Sense Configurations
R BIAS = R EQ
V RIPPLE ( P ? P ) = IDLE ESR
Output Capacitor Selection
The output filter capacitor must have low enough equiv-
alent series resistance (ESR) to meet output ripple and
load-transient requirements, yet have high enough ESR
to satisfy stability requirements. The output capaci-
tance must be high enough to absorb the inductor
energy while transitioning from full-load to no-load con-
ditions without tripping the overvoltage fault protection.
When using high-capacitance, low-ESR capacitors (see
the Output-Capacitor Stability Considerations section),
the filter capacitor’s ESR dominates the output voltage
ripple. So the output capacitor’s size depends on the
maximum ESR required to meet the output-voltage-rip-
ple (V RIPPLE(P-P) ) specifications:
V RIPPLE(P-P) = R ESR I LOAD(MAX) LIR
In Idle Mode, the inductor current becomes discontinu-
ous, with peak currents set by the idle-mode current-
sense threshold (V IDLE = 0.2V LIMIT ). In Idle Mode, the
no-load output ripple can be determined as follows:
V R
R SENSE
The actual capacitance value required relates to the
physical size needed to achieve low ESR, as well as to
the chemistry of the capacitor technology. Thus, the
capacitor is usually selected by ESR and voltage rating
rather than by capacitance value (this is true of tanta-
lums, OS-CONs, polymers, and other electrolytics).
When using low-capacity filter capacitors, such as
ceramic capacitors, size is usually determined by the
capacity needed to prevent V SAG and V SOAR from
causing problems during load transients. Generally,
once enough capacitance is added to meet the over-
shoot requirement, undershoot at the rising load edge
is no longer a problem (see the V SAG and V SOAR equa-
tions in the Transient Response section). However, low-
capacity filter capacitors typically have high-ESR zeros
that may effect the overall stability (see the Output-
Capacitor Stability Considerations section).
______________________________________________________________________________________
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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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