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| 型号： | MAX1977EEI+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/32页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR PS QUAD HI EFF 28QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 应用： | 控制器，笔记本电脑电源系统 |
| 输入电压： | 4.5 V ~ 24 V |
| 输出数： | 4 |
| 输出电压： | 3.3V，5V，2 V ~ 5.5 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-QSOP |
| 供应商设备封装： | 28-QSOP |
| 包装： | 管件 |
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High-Efficiency, Quad Output, Main Power-
Supply Controllers for Notebook Computers
Table 3. Operating Mode Truth Table
MODE
Power-Up
Run
Overvoltage
Protection
Undervoltage
Protection
Discharge
Standby
Shutdown
Thermal Shutdown
CONDITION
LDO5 < UVLO threshold
SHDN = high, ON3 or ON5
enabled
Either output > 111% of
nominal level, PRO = low
Either output < 70% of
nominal after 22ms time-
out expires and output is
enabled, PRO = low
PRO is low and either
SMPS output is still high in
either standby mode or
shutdown mode
ON5, ON3 < startup
threshold, SHDN = high
SHDN = low
T J > +160 ° C
COMMENT
Transitions to discharge mode after a V+ POR and after REF becomes valid.
LDO5, LDO3, REF remain active. DL_ is active if PRO is low.
Normal operation
DL_ is forced high. LDO3, LDO5 active. Exited by a V+ POR or by toggling
SHDN , ON3, or ON5.
If PRO is low, DL_ is forced high after discharge mode terminates. LDO3,
LDO5 active. Exited by a V+ POR or by toggling SHDN , ON3, or ON5.
Discharge switch (12 ? ) connects OUT_ to PGND. One output may still run
while the other is in discharge mode. Activates when LDO_ is in UVLO, or
transition to UVLO, standby, or shutdown has begun. LDO3, LDO5 active.
DL_ stays high if PRO is low. LDO3, LDO5 active.
All circuitry off
All circuitry off. Exited by V+ POR or cycling SHDN , ON3, or ON5.
in shutdown mode. When shutdown mode activates, the
reference turns off, making the threshold to exit shut-
down inaccurate. To guarantee startup, drive SHDN
above 2V ( SHDN input rising-edge trip level). For auto-
matic shutdown and startup, connect SHDN to V+. If
PRO is low, both SMPS outputs are discharged to 0.3V
through a 12 ? switch before entering true shutdown.
The accurate 1V falling-edge threshold on SHDN can be
used to detect a specific analog voltage level and shut
the device down. Once in shutdown, the 1.6V rising-
edge threshold activates, providing sufficient hysteresis
for most applications. For additional hysteresis, the
undervoltage threshold can be made dependent on
REF or LDO_, which go to 0V in shutdown.
Table 4. Power-Up Sequencing
Power-Up Sequencing and
On/Off Controls (ON3, ON5)
ON3 and ON5 control SMPS power-up sequencing.
ON3 or ON5 rising above 2.4V enables the respective
outputs. ON3 or ON5 falling below 1.6V disables the
respective outputs.
Connecting ON3 or ON5 to REF forces the respective
outputs off while the other output is below regulation and
starts after that output regulates. The second SMPS
remains on until the first SMPS turns off, the device shuts
down, a fault occurs, or LDO5 goes into undervoltage
lockout. Both supplies begin their power-down sequence
immediately when the first supply turns off. Driving ON_
SHDN ( V)
< 1.0
> 2.4
> 2.4
> 2.4
> 2.4
> 2.4
> 2.4
V ON3 ( V)
X
< 1.6
> 2.4
> 2.4
< 1.6
> 2.4
REF
V ON5 ( V)
X
< 1.6
> 2.4
< 1.6
> 2.4
REF
> 2.4
LDO5
Off
On
On
On
On
On
On
LDO3
Off
On
On
On
On
On
On
5V SMPS
Off
Off
On
Off
On
On (after 3V
SMPS is up)
On
3V SMPS
Off
Off
On
On
Off
On
On (after 5V
SMPS is up)
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1977EEI+ | 功能描述:DC/DC 开关控制器 Quad Out Main Power Supply Controller 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 |
| MAX1977EEI+T | 功能描述:DC/DC 开关控制器 Quad Out Main Power Supply Controller 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 |
| MAX1977EEI-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 |
| MAX1977EEI-TG068 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX1978ETM | 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 |
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