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| 型号： | MAX8734AEEI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 23/33页 |
| 文件大小： | 0K |
| 描述： | IC PWR SUPPLY CONTROLLER 28QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | 电源控制器 |
| 输入电压： | 4.5 V ~ 24 V |
| 电流 - 电源： | 25µA |
| 工作温度： | -40°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： | 带卷 (TR) |
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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, and 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.
synchronous rectifier drivers clamp the SMPS outputs
to GND. When PRO is high, the SMPS outputs do not
discharge and the DL_ synchronous rectifier drivers
remain low.
Shutdown Mode
Drive SHDN below the precise SHDN input falling-edge
trip level to place the MAX8732A/MAX8733A/MAX8734A
in their low-power shutdown state. The MAX8732A/
MAX8733A/MAX8734A consume only 6μA of quiescent
current while in shutdown mode. When shutdown mode
activates, the reference turns off, making the threshold
to exit shutdown inaccurate. To guarantee startup,
Table 4. Power-Up Sequencing
drive SHDN above 2V ( SHDN input rising-edge trip
level). For automatic shutdown and startup, connect
SHDN to V+. If PRO is low, both SMPS outputs are dis-
charged 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 volt-
age level and shut down the device. Once in shutdown,
the 1.6V rising-edge threshold activates, providing suffi-
cient hysteresis for most applications. For additional
hysteresis, the undervoltage threshold can be made
dependent on REF or LDO_, which go to 0V in shutdown.
SHDN
( V)
Low
“> 2.4” => High
“> 2.4” => High
“> 2.4” => High
“> 2.4” => High
“> 2.4” => High
“> 2.4” => High
V ON3
( V)
X
Low
High
High
Low
High
REF
V ON5
( V)
X
Low
High
Low
High
REF
High
LDO5
Off
On
On
On
On
On
On
LDO3
Off
On (after REF powers up)
On (after REF powers up)
On (after REF powers up)
On (after REF powers up)
On (after REF powers up)
On (after REF powers up)
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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