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| 型号： | MAX8744AETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 24/36页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR PWR SUP QUAD 32TQFN |
| 标准包装： | 2,500 |
| 应用： | 控制器，笔记本电脑电源系统 |
| 输入电压： | 6 V ~ 26 V |
| 输出数： | 4 |
| 输出电压： | 3.3V，5V，1 V ~ 26 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 32-WFQFN 裸露焊盘 |
| 供应商设备封装： | 32-TQFN-EP（5x5） |
| 包装： | 带卷 (TR) |
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High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
Table 5. Operating Modes Truth Table
MODE
Power-Up
Run
Output Overvoltage
(OVP) Protection
(MAX8744A)
Output Undervoltage
Protection (UVP)
Standby
Shutdown
Thermal Shutdown
Switchover Fault
CONDITION
LDO5 < UVLO threshold
SHDN = high, ON3 or ON5 enabled
Either output > 111% of nominal level
Either output < 70% of nominal level,
UVP is enabled 6144 clock cycles
(1/f OSC ) after the output is enabled
ON5 and ON3 < startup threshold,
SHDN = high
SHDN = low
T J > +160°C
Excessive current on LDO5 switchover
transistors
COMMENT
Transitions to discharge mode after V IN POR and after REF
becomes valid. LDO5, REF remain active. DL_ is active
(high).
Normal operation.
Exited by POR or cycling SHDN , ON3, or ON5.
Exited by POR or cycling SHDN , ON3, or ON5.
DL_ stays high. LDO5 active.
All circuitry off.
Exited by POR or cycling SHDN , ON3, or ON5.
DL3 and DL5 go high before LDO5 turns off. They remain
high as long as possible thereafter.
Exited by POR or cycling SHDN , ON3, or ON5.
Fault Protection
Output Overvoltage Protection (OVP)—
MAX8744A Only
If the output voltage of either SMPS rises above 111% of
its nominal regulation voltage and the OVP protection is
enabled, the controller sets the fault latch, pulls PGOOD
low, shuts down the SMPS controllers that tripped the
fault, and immediately pulls DH_ low and forces DL_
high. This turns on the synchronous-rectifier MOSFETs
with 100% duty, rapidly discharging the output capaci-
tors and clamping both outputs to ground. However,
immediately latching DL_ high typically causes slightly
negative output voltages due to the energy stored in the
output LC at the instant the OVP occurs. If the load can-
not tolerate a negative voltage, place a power Schottky
diode across the output to act as a reverse-polarity
clamp. If the condition that caused the overvoltage per-
sists (such as a shorted high-side MOSFET), the battery
blows. The other output is shut down using the soft-shut-
down sequence. Cycle LDO5 below 1V or toggle either
ON3, ON5, or SHDN to clear the fault latch and restart
the SMPS controllers.
Output Undervoltage Protection (UVP)
Each SMPS controller includes an output UVP protec-
tion circuit that begins to monitor the output 6144 clock
cycles (1/f OSC ) after that output is enabled (ON_ pulled
high). If either SMPS output voltage drops below 70%
of its nominal regulation voltage and the UVP protection
is enabled, the UVP circuit sets the fault latch, pulls
PGOOD low, and shuts down both controllers using the
soft-shutdown sequence. When an SMPS output volt-
age drops to 0.1V, its synchronous rectifier turns on,
clamping the discharged output to GND. Cycle LDO5
below 1V or toggle either ON3, ON5, or SHDN to clear
the fault latch and restart the SMPS controllers.
Thermal-Fault Protection
The MAX8744A/MAX8745A feature a thermal fault-pro-
tection circuit. When the junction temperature rises
above +160 ° C, a thermal sensor activates the fault
latch, pulls PGOOD low, and shuts down both SMPS
controllers using the soft-shutdown sequence. When an
SMPS output voltage drops to 0.1V, its synchronous
rectifier turns on, clamping the discharged output to
GND. Toggle either ON3, ON5, or SHDN to clear the
fault latch and restart the controllers after the junction
temperature cools by 15 ° C.
24
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相关代理商/技术参数 |
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|---|---|
| MAX8744AEVKIT+ | 制造商:Maxim Integrated Products 功能描述:MAX8744A EVAL KIT - Rail/Tube |
| MAX8744ETJ+ | 功能描述:电流型 PWM 控制器 Quad-Out Main Power Supply Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX8744ETJ+T | 功能描述:电流和电力监控器、调节器 Quad-Out Main Power Supply Controller RoHS:否 制造商:STMicroelectronics 产品:Current Regulators 电源电压-最大:48 V 电源电压-最小:5.5 V 工作温度范围:- 40 C to + 150 C 安装风格:SMD/SMT 封装 / 箱体:HPSO-8 封装:Reel |
| MAX8744EVKIT | 制造商:Maxim Integrated Products 功能描述:HIGH-EFFICIENCY QUAD OUTPUT MAIN - Rail/Tube |
| MAX8744EVKIT+ | 制造商:Maxim Integrated Products 功能描述:HIGH-EFFICIENCY QUAD OUTPUT MAIN - Rail/Tube |
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