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參數(shù)資料
| 型號： | MAX1717 |
| 廠商： | Maxim Integrated Products, Inc. |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | Replaced by TMS320VC5506 : Digital Signal Processors 132-BQFP |
| 中文描述： | 動態(tài)可調(diào)、同步降壓型控制器，用于筆記本CPU |
| 文件頁數(shù)： | 23/32頁 |
| 文件大?。?/td> | 501K |
| 代理商： | MAX1717 |
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M
Dynamically Adjustable, Synchronous
Step-Down Controller for Notebook CPUs
______________________________________________________________________________________
23
the transitions relatively smooth. The average inductor
current required to make an output voltage transition is:
I
L
C
OUT
·
25mV
·
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
is then latched high until SKP/
SDN
is toggled or V
CC
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
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).
NO FAULT Test Mode
The over/undervoltage protection features can compli-
cate the process of debugging prototype breadboards
since there are (at most) a few milliseconds in which to
determine what went wrong. Therefore, a test mode is
provided to disable totally the OVP, UVP, and thermal
shutdown features, and clear the fault latch if it has
MAX1717
D4
D3
D2
D1
D0
A/B
*
TO REDUCE QUIESCENT CURRENT, 1k
PULL-UP RESISTORS CAN BE REPLACED BY 1M
RESISTORS WITH 4.7nF CAPACATORS IN PARALLEL.
B-MODE VID =
01000
→
1.6V
CPU VID =
01101
→
1.35V
(A-MODE)
1k
1M
1k
1k
1k
1k
4.7nF
*OPTIONAL
3.15 TO 5.5V
100k
CPU
A/B = LOW = 1.60V
A/B = HIGH = 1.35V
Figure 10. Using the Internal Mux with CPU Driving the A-Mode VID Code
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX1717EEG | Replaced by TMS320VC5506 : Digital Signal Processors 100-LQFP |
| MAX1718EEI | Notebook CPU Step-Down Controller for Intel Mobile Voltage Positioning IMVP-II |
| MAX1718 | Replaced by TMS320VC5506 : Digital Signal Processors 100-LQFP -40 to 85 |
| MAX1718BEEI | Notebook CPU Step-Down Controller for Intel Mobile Voltage Positioning IMVP-II |
| MAX1720EUTG | Switched Capacitor Voltage Inverter with Shutdown |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX17175ETG+ | 制造商:Maxim Integrated Products 功能描述:BOOST REG W/INTEGRATED CHARGE PUMPS SWITCH CONTROL & HIGH-CU - Rail/Tube |
| MAX1717BEEG | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1717BEEG+ | 功能描述:DC/DC 開關(guān)控制器 Adj Synchronous Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1717BEEG+T | 功能描述:DC/DC 開關(guān)控制器 Adj Synchronous Step-Down RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| MAX1717BEEG-T | 功能描述:DC/DC 開關(guān)控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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