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参数资料
| 型号： | MAX1717EEG+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/33页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 24-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 100% |
| 电源电压： | 4.5 V ~ 5.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
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Dynamically Adjustable, Synchronous
Step-Down Controller for Notebook CPUs
3.15 TO 5.5V
*OPTIONAL
4.7nF
1M Ω
1k Ω
1k Ω
1k Ω
1k Ω
1k Ω
MAX1717
D4
100k Ω
D3
CPU
D2
D1
D0
A/B
CPU VID =
01101 → 1.35V
B-MODE VID =
01000 → 1.6V
A/B = LOW = 1.60V
A/B = HIGH = 1.35V
(A-MODE)
* TO REDUCE QUIESCENT CURRENT, 1k Ω PULLUP RESISTORS CAN BE REPLACED BY 1M Ω RESISTORS WITH 4.7nF CAPACATORS IN PARALLEL.
Figure 10. Using the Internal Mux with CPU Driving the A-Mode VID Code
The transition time is given by:
is then latched high until SKP/ SDN is toggled or V CC
?
≤ 4 μ s + ?
? f SLEW
? ? ?
?
1
?
? 1 +
?
V OLD ? V NEW
25 mV
? ?
? ?
power is cycled below 1V. This action turns on the syn-
chronous-rectifier MOSFET with 100% duty and, in turn,
rapidly discharges the output filter capacitor and forces
the output to ground. If the condition that caused the
where f SLEW = 150kHz x 120k Ω / R TIME , V OLD is the
original output voltage, and V NEW is the new output volt-
age. See Time Frequency Accuracy in the Electrical
Characteristics for f SLEW accuracy.
The practical range of R TIME is 47k Ω to 470k Ω , corre-
sponding to 2.6μs to 26μs per 25mV step. Although the
DAC takes discrete 25mV steps, the output filter makes
the transitions relatively smooth. The average inductor
current required to make an output voltage transition is:
I L ? C OUT x 25mV x f SLEW
Output Overvoltage Protection
The overvoltage protection (OVP) circuit is designed to
protect against a shorted high-side MOSFET by draw-
ing high current and blowing the battery fuse. The out-
put voltage is continuously monitored for overvoltage. If
the output is more than 2.25V, OVP is triggered and the
circuit shuts down. The DL low-side gate-driver output
overvoltage (such as a shorted high-side MOSFET)
persists, the battery fuse will blow. DL is also kept high
continuously when V CC UVLO is active, as well as in
shutdown mode (Table 5).
Overvoltage protection can be defeated through the
NO FAULT test mode (see the NO FAULT Test Mode
section).
Output Undervoltage Shutdown
The output UVP function is similar to foldback current
limiting, but employs a timer rather than a variable cur-
rent limit. If the MAX1717 output voltage is under 70% of
the nominal value, the PWM is latched off and won’t
restart until V CC power is cycled or SKP/ SDN is tog-
gled. To allow startup, UVP is ignored during the under-
voltage fault-blanking time (the first 256 cycles of the
slew rate after startup).
UVP can be defeated through the NO FAULT test mode
(see the NO FAULT Test Mode section).
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1717EEG+ | 功能描述:DC/DC 开关控制器 Adj Synchronous Step-Down 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 |
| MAX1717EEG+C71058 | 功能描述:DC/DC 开关控制器 Step-Down Controller for Notebook CPU 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 |
| MAX1717EEG+T | 功能描述:DC/DC 开关控制器 Adj Synchronous Step-Down 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 |
| MAX1717EEG-C71058 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1717EEG-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 |
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