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参数资料
| 型号： | MAX1533AETJ+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 27/38页 |
| 文件大小： | 0K |
| 描述： | IC POWER SUPPLY CONTROLER 32TQFN |
| 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 ~ 26 V |
| 电流 - 电源： | 15µA |
| 工作温度： | -40°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, 5x Output, Main Power-Supply
Controllers for Notebook Computers
Thermal Fault Protection
The MAX1533A/MAX1537A 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 discharge mode (see the Output
Discharge (Soft-Shutdown) section). When an SMPS
SECONDARY
FEEDBACK
output voltage drops to 0.3V, its synchronous rectifier
turns on, clamping the discharged output to GND.
INA
LDOA
R 1 = R 2 ? LDOA - 1 ?
Cycle V CC below 1V or toggle either ON3, ON5, or
SHDN to clear the fault latch and restart the controllers
after the junction temperature cools by 15 ° C.
Auxiliary LDO Detailed
Description (MAX1537A Only)
The MAX1537A includes an auxiliary linear regulator
that delivers up to 150mA of load current. The output
(LDOA) can be preset to 12V, ideal for PCMCIA power
requirements, and for biasing the gates of load switch-
es in a portable device. In adjustable mode, LDOA can
be set to anywhere from 5V to 23V. The auxiliary regu-
lator has an independent ON/OFF control, allowing it to
be shut down when not needed, reducing power con-
sumption when the system is in a low-power state.
A flyback-winding control loop regulates a secondary
winding output, improving cross-regulation when the pri-
mary output is lightly loaded or when there is a low
input-output differential voltage. If V INA - V LDOA falls
below 0.8V, the low-side switch is turned on for a time
equal to 33% of the switching period. This reverses the
inductor (primary) current, pulling current from the out-
put filter capacitor and causing the flyback transformer
to operate in forward mode. The low impedance pre-
sented by the transformer secondary in forward mode
dumps current into the secondary output, charging up
the secondary capacitor and bringing V INA - V LDOA
back into regulation. The secondary feedback loop does
not improve secondary output accuracy in normal fly-
back mode, where the main (primary) output is heavily
loaded. In this condition, secondary output accuracy is
determined by the secondary rectifier drop, transformer
turns ratio, and accuracy of the main output voltage.
Adjustable LDOA Voltage
(Dual-Mode Feedback)
Connect ADJA to GND to enable the fixed, preset 12V
auxiliary output. Connect a resistive voltage-divider at
ADJA between LDOA and GND to adjust the respective
output voltage between 5V and 23V (Figure 8). Choose
R2 (resistance from ADJA to GND) to be approximately
FIXED 12V
ONA
5R
REF (2.0V)
R
ADJA
0.15V
Figure 8. Linear-Regulator Functional Diagram
100k Ω and solve for R1 (resistance from LDOA to
ADJA) using the following equation:
? V ?
? V ADJA ?
where V ADJA = 2V nominal.
Design Procedure
Firmly establish the input voltage range and maximum
load current before choosing a switching frequency
and inductor operating point (ripple-current ratio). The
primary design trade-off lies in choosing a good switch-
ing frequency and inductor operating point, and the fol-
lowing four factors dictate the rest of the design:
? Input Voltage Range. The maximum value
(V IN(MAX) ) must accommodate the worst-case, high
AC-adapter voltage. The minimum value (V IN(MIN) )
must account for the lowest battery voltage after
drops due to connectors, fuses, and battery-selector
switches. If there is a choice at all, lower input volt-
ages result in better efficiency.
______________________________________________________________________________________
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1533ETJ | 功能描述:电流和电力监控器、调节器 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 |
| MAX1533ETJ+ | 功能描述:电流和电力监控器、调节器 PS Controllers for for Notebooks 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 |
| MAX1533ETJ+T | 功能描述:电流和电力监控器、调节器 PS Controllers for for Notebooks 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 |
| MAX1533ETJ-T | 功能描述:电流和电力监控器、调节器 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 |
| MAX1533EVKIT | 功能描述:电流和电力监控器、调节器 Evaluation Kit for the MAX1533 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 |
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