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| 型号： | MAX17480EVKIT+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 38/48页 |
| 文件大小： | 0K |
| 描述： | EVALUATION KIT FOR MAX17480 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 3，非隔离 |
| 输入电压： | 4 ~ 26 V |
| 稳压器拓扑结构： | 降压 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | MAX17480 |
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AMD 2-/3-Output Mobile Serial
VID Controller
Table 6. ILIM3 Setting
ILIM3
V CC
GND
PEAK CURRENT
LIMIT (A)
5.25
4.25
SKIP CURRENT
LIMIT (A)
1.3
1.05
MAX DC
CURRENT (A)
4.75
3.75
FULL-LOAD
DROOP (mV)
-26.13
-20.63
OFFSET
(mV)
12.5
12.5
Offset and Current-Limit Setting
for NB SMPS (ILIM3)
The offset and current-limit settings of the NB SMPS
can be set by the ILIM3 pin setting. Table 6 shows the
ILIM3 pin voltage levels and the corresponding settings
for the offset and current limit of the NB SMPS. The NB
offset is always present regardless of PSI_L setting.
The I LX3MIN minimum current-limit threshold in skip
mode is precisely 25% of the corresponding positive
current-limit threshold.
SMPS Design Procedure
Firmly establish the input voltage range and maximum
load current before choosing a switching frequency
and inductor operating point (ripple-current ratio). The
primary design trade-off lies in choosing a good switch-
ing frequency and inductor operating point, and the fol-
lowing four factors dictate the rest of the design:
? Input Voltage Range: The maximum value (V IN(MAX) )
must accommodate the worst-case high AC adapter
voltage. The minimum value (V IN(MIN) ) must account for
the lowest input voltage after drops due to connectors,
fuses, and battery selector switches. If there is a choice
? Core Switching Frequency: This choice determines
the basic trade-off between size and efficiency. The
optimal frequency is largely a function of maximum
input voltage, due to MOSFET switching losses that
are proportional to frequency and V IN 2 . The optimum
frequency is also a moving target, due to rapid
improvements in MOSFET technology that are making
higher frequencies more practical.
When selecting a switching frequency, the minimum
on-time at the highest input voltage and lowest output
voltage must be greater than the 150ns (max) mini-
mum on-time specification in the Electrical
Characteristics table:
V OUT(MIN) /V IN(MAX) x t SW > t ON(MIN)
A good rule is to choose a minimum on-time of at
least 200ns.
When in pulse-skipping operation (PSI_L = 0), the
minimum on-time must take into consideration the
time needed for proper skip-mode operation. The on-
time for a skip pulse must be greater than the 170ns
(max) minimum on-time specification in the Electrical
Characteristics table:
R SENSE ( IN ( MAX ) ? V OUT ( MIN )
at all, lower input voltages result in better efficiency.
? Maximum Load Current: There are two values to
consider. The peak load current (I LOAD(MAX) ) deter-
t ON ( MIN ) ≤
V
LV IDLE
)
I LOAD ( PHASE ) = LOAD
mines the instantaneous component stresses and fil-
tering requirements, and thus drives output capacitor
selection, inductor saturation rating, and the design
of the current-limit circuit. The continuous load cur-
rent (I LOAD ) determines the thermal stresses and thus
drives the selection of input capacitors, MOSFETs,
and other critical heat-contributing components.
Modern notebook CPUs generally exhibit I LOAD =
I LOAD(MAX) x 80%.
For multiphase systems, each phase supports a frac-
tion of the load, depending on the current balancing.
When properly balanced, the load current is evenly
distributed among each phase:
I
η PH
where η PH is the total number of active phases.
? Inductor Operating Point: This choice provides
trade-offs between size vs. efficiency and transient
response vs. output noise. Low inductor values pro-
vide better transient response and smaller physical
size, but also result in lower efficiency and higher out-
put noise due to increased ripple current. The mini-
mum practical inductor value is one that causes the
circuit to operate at the edge of critical conduction
(where the inductor current just touches zero with
every cycle at maximum load). Inductor values lower
than this grant no further size-reduction benefit. The
optimum operating point is usually found between
20% and 50% ripple current.
38
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX17480EVKIT+ | 功能描述:电源管理IC开发工具 MAX17480 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 |
| MAX17480GTL+ | 功能描述:显示驱动器和控制器 2-/3-Output Mobile erial VID Ctlr RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX17480GTL+T | 功能描述:显示驱动器和控制器 2-/3-Output Mobile erial VID Ctlr RoHS:否 制造商:Panasonic Electronic Components 工作电源电压:2.7 V to 5.5 V 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:QFN-44 封装:Reel |
| MAX17482GTL+ | 功能描述:电压模式 PWM 控制器 NDA IC RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
| MAX17482GTL+T | 功能描述:电压模式 PWM 控制器 NDA IC RoHS:否 制造商:Texas Instruments 输出端数量:1 拓扑结构:Buck 输出电压:34 V 输出电流: 开关频率: 工作电源电压:4.5 V to 5.5 V 电源电流:600 uA 最大工作温度:+ 125 C 最小工作温度:- 40 C 封装 / 箱体:WSON-8 封装:Reel |
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