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参数资料
| 型号： | MAX1545ETL+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 22/43页 |
| 文件大小： | 0K |
| 描述： | IC QUICK-PWM DUAL-PHASE 40-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 系列： | Quick-PWM™ |
| 应用： | 控制器，Intel Pentium? IV |
| 输入电压： | 2 V ~ 28 V |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 1.85 V |
| 工作温度： | -40°C ~ 100°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 40-WFQFN 裸露焊盘 |
| 供应商设备封装： | 40-TQFN-EP（6x6） |
| 包装： | 管件 |
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Dual-Phase, Quick-PWM Controllers for
Programmable CPU Core Power Supplies
SUS
1 LSB PER R TIME CYCLE
V DAC
OUTPUT SET BY SUS AND S0–S1
OUTPUT SET BY D0–D4
t SLEW
t BLANK = 24 CLKS
t SLEW
t BLANK = 24 CLKS
TIME
CLOCK
VROK
1 ? V OLD ? V NEW ?
f SLEW ? ?
t SLEW ≈ ? for V OUT ri sin g
1 ? ? V OLD ? V NEW ? ?
f SLEW ? ? ?
? ?
VROK BLANKING
Figure 4. Suspend Transition
than the current limit set by ILIM. The transition time is
given by:
V LSB ?
t SLEW ≈ ? ? ? + 2 ? for V OUT falling
V LSB ?
where f SLEW = 500kHz ? 30k Ω / R TIME , V OLD is the
original DAC setting, V NEW is the new DAC setting, and
V LSB is the DAC ’s smallest voltage increment. The
additional two clock cycles on the falling edge time are
due to internal synchronization delays. See TIME
Frequency Accuracy in the Electrical Characteristics for
f SLEW limits.
The practical range of R TIME is 15k Ω to 150k Ω corre-
sponding to 1.0μs to 10μs per 25mV step. Although the
DAC takes discrete steps, the output filter makes the
transitions relatively smooth. The average inductor cur-
rent required to make an output voltage transition is:
I L ? C OUT × V LSB × f SLEW
Fault Protection
Output Overvoltage Protection
(MAX1545 Only)
The overvoltage protection (OVP) circuit is designed to
protect the CPU against a shorted high-side MOSFET by
drawing high current and blowing the battery fuse. The
MAX1519/MAX1545 continuously monitor the output for
VROK BLANKING
an overvoltage fault. During normal forced-PWM opera-
tion ( SKIP = high), the controller detects an OVP fault if
the output voltage exceeds the set DAC voltage by
more than 13% (min). During pulse-skipping operation
( SKIP = REF or GND), the controller detects an OVP
fault if the output voltage exceeds the fixed 2V (typ)
threshold. When the OVP circuit detects an overvoltage
fault, it immediately sets the fault latch, pulls VROK low,
and activates the shutdown sequence.
This action 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 blows. The controller remains
shut down until the fault latch is cleared by toggling
SHDN or cycling the V CC power supply below 1V.
Overvoltage protection can be disabled 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 current
limit. If the MAX1519/MAX1545 output voltage is under
70% of the nominal value, the controller activates the
shutdown sequence and sets the fault latch.
Once the controller ramps down to the 0V DAC code
setting, it forces the DL_ low-side gate-driver high, and
pulls the DH_ high-side gate-driver low. Toggle SHDN
or cycle the V CC power supply below 1V to clear the
fault latch and reactivate the controller. UVP is ignored
during output voltage transitions and remains blanked
22
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1545ETL+ | 功能描述:电压模式 PWM 控制器 Dual-Phase Quick-PWM Controller 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 |
| MAX1545ETL+T | 功能描述:电压模式 PWM 控制器 Dual-Phase Quick-PWM Controller 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 |
| MAX1545ETL-T | 功能描述:电压模式 PWM 控制器 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 |
| MAX1546AETL | 制造商:Maxim Integrated Products 功能描述:DUAL-PHASE, QUICK-PWM CONTROLLER FOR IMVP CPU - Rail/Tube |
| MAX1546AETL+ | 制造商:Maxim Integrated Products 功能描述:DUAL-PHASE, QUICK-PWM CONTROLLER FOR IMVP CPU - Rail/Tube |
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