參數(shù)資料
型號： MAX1977
廠商： Maxim Integrated Products, Inc.
英文描述： High-Efficiency, Quad Output, Main Power- Supply Controllers for Notebook Computers
中文描述： 高效率、四路輸出、主電源控制器，用于筆記本電腦
文件頁數(shù)： 23/32頁
文件大?。?/td> 497K
代理商： MAX1977
M
High-Effic ienc y, Quad Output, Main Power-
S upply Controllers for Notebook Computers
______________________________________________________________________________________
23
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.
Power-Up S equenc ing 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_
MODE
CONDITION
COMMENT
Power-Up
LDO5 < UVLO threshold
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.
Run
SHDN
= high, ON3 or ON5
enabled
Normal operation
Overvoltage
Protection
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
DL_ is forced high. LDO3, LDO5 active. Exited by a V+ POR or by toggling
SHDN
, ON3, or ON5.
Undervoltage
Protection
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
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.
Standby
DL_ stays high if
PRO
is low. LDO3, LDO5 active.
Shutdown
Thermal Shutdown
All circuitry off
All circuitry off. Exited by V+ POR or cycling
SHDN
, ON3, or ON5.
Table 3. Operating Mode Truth Table
SHDN (
V)
< 1.0
> 2.4
> 2.4
> 2.4
> 2.4
V
ON3
(
V)
X
< 1.6
> 2.4
> 2.4
< 1.6
V
ON5
(
V)
X
< 1.6
> 2.4
< 1.6
> 2.4
LDO5
Off
On
On
On
On
LDO3
Off
On
On
On
On
5V SMPS
Off
Off
On
Off
On
On (after 3V
SMPS is up)
3V SMPS
Off
Off
On
On
Off
> 2.4
> 2.4
REF
On
On
On
> 2.4
REF
> 2.4
On
On
On
On (after 5V
SMPS is up)
Table 4. Power-Up Sequencing
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