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參數(shù)資料
| 型號： | MAX1533A |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | High-Efficiency, 5x Output, Main Power-Supply Controllers for Notebook Computers |
| 中文描述： | 高效率、5路輸出、主電源控制器，用于筆記本電腦 |
| 文件頁數(shù)： | 26/38頁 |
| 文件大?。?/td> | 1427K |
| 代理商： | MAX1533A |
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M
High-Efficiency, 5x Output, Main Power-Supply
Controllers for Notebook Computers
26
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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
cannot 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 overvolt-
age persists (such as a shorted high-side MOSFET),
the battery fuse blows. Cycle V
CC
below 1V or toggle
either ON3, ON5, or
SHDN
to clear the fault latch and
restart the SMPS controllers.
Connect
OVP
to V
CC
to disable the output overvoltage
protection.
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 pro-
tection is enabled (
UVP
= GND), the UVP circuit sets
the fault latch, pulls PGOOD low, and shuts down both
controllers using discharge mode (see the
Output
Discharge (Soft-Shutdown)
section). When an SMPS
output voltage drops to 0.3V, its synchronous rectifier
turns on, clamping the discharged output to GND.
Cycle V
CC
below 1V or toggle either ON3, ON5, or
SHDN
to clear the fault latch and restart the SMPS
controllers.
Connect
UVP
to V
CC
to disable the output undervoltage
protection.
Table 5. Operating Modes Truth Table
MODE
CONDITION
COMMENTS
Power-Up
LDO5 < UVLO threshold.
Transitions to discharge mode after V
IN
POR and after REF
becomes valid. LDO5, LDO3, REF remain active. DL_ is active
if
OVP
is low.
Run
SHDN
= high, ON3 or ON5 enabled.
Normal operation.
Output Overvoltage
Protection (OVP)
Either output > 111% of nominal level,
OVP
= low.
Exited by POR or cycling
SHDN
, ON3, or ON5.
Output Undervoltage
Protection (UVP)
Either output < 70% of nominal level, UVP
is enabled 6144 clock cycles (1 / f
OSC
)
after the output is enabled and
UVP
= low.
Exited by POR or cycling
SHDN
, ON3, or ON5. If
OVP
is not
high, DL3 and DL5 go high after discharge.
Discharge
OVP
is low and either SMPS output is still
high in either standby mode or shutdown
mode.
Discharge switch (10
Ω
) connects CSL_ to PGND. This is a
temporary state entered when LDO5 is undervoltage or on the
way to output UVLO, standby, shutdown, or thermal-shutdown
states. One SMPS can be in discharge mode while the other is
in run mode. If both outputs are discharged to 0.3V (on CSL_),
discharge mode transitions to the appropriate state.
Standby
ON5 and ON3 < startup threshold,
SHDN
= high.
DL_ stays high if
OVP
is low. LDO3, LDO5 active.
Shutdown
SHDN
= low.
All circuitry off.
Thermal Shutdown
T
J
> +160°C.
Exited by POR or cycling
SHDN
, ON3, or ON5.
If
OVP
is not high, DL3 and DL5 go high before LDO5 turns off.
Switchover Fault
Excessive current on LDO3 or LDO5
switchover transistors.
Exited by POR or cycling
SHDN
, ON3, or ON5.
If
OVP
is not high, DL3 and DL5 go high before LDO5 turns off.
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX1533AETJ+ | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 PS Controllers for for Notebooks RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| MAX1533AETJ+T | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 PS Controllers for for Notebooks RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| MAX1533ETJ | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| MAX1533ETJ+ | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 PS Controllers for for Notebooks RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
| MAX1533ETJ+T | 功能描述:電流和電力監(jiān)控器、調(diào)節(jié)器 PS Controllers for for Notebooks RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Current Regulators 電源電壓-最大:48 V 電源電壓-最小:5.5 V 工作溫度范圍:- 40 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:HPSO-8 封裝:Reel |
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