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| 型号： | MAX8745ETJ+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 1/36页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR PWR SUP QUAD 32TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 60 |
| 应用： | 控制器，笔记本电脑电源系统 |
| 输入电压： | 6 V ~ 26 V |
| 输出数： | 4 |
| 输出电压： | 3.3V，5V，1 V ~ 26 V |
| 工作温度： | 0°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： | 管件 |
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ATION
EVALU
AVAIL
19-3796; Rev 0; 4/06
KIT
ABLE
High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
General Description
Features
The MAX8744/MAX8745 are dual step-down, switch-
mode, power-supply (SMPS) controllers with synchro-
nous rectification, intended for main 5V/3.3V power
generation in battery-powered systems. Fixed-frequen-
cy operation with optimal interleaving minimizes input
ripple current from the lowest input voltages up to the
26V maximum input. Optimal 40/60 interleaving allows
the input voltage to go down to 8.3V before duty-cycle
overlap occurs, compared to 180° out-of-phase regula-
tors where the duty-cycle overlap occurs when the
input drops below 10V.
Output current sensing provides peak current-limit pro-
tection, using either an accurate sense resistor or using
lossless inductor DCR current sensing. A low-noise
mode maintains high light-load efficiency while keeping
the switching frequency out of the audible range.
An internal, fixed 5V, 100mA linear regulator powers up
the MAX8744/MAX8745 and their gate drivers, as well
as external keep-alive loads. When the main PWM reg-
ulator is in regulation, an automatic bootstrap switch
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o
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Fixed-Frequency, Current-Mode Control
40/60 Optimal Interleaving
Internal BST Switches
Internal 5V, 100mA Linear Regulator
Auxiliary Linear-Regulator Driver (12V or
Adjustable Down to 1V)
Dual Mode? Feedback—3.3V/5V Fixed or
Adjustable Output Voltages
200kHz/300kHz/500kHz Switching Frequency
Undervoltage and Thermal-Fault Protection
Overvoltage-Fault Protection (MAX8744 Only)
6V to 26V Input Range
2V ±0.75% Reference Output
Independent Enable Inputs and Power-Good
Outputs
Soft-Start and Soft-Shutdown (Voltage Ramp)
8μA (typ) Shutdown Current
Ordering Information
bypasses the internal linear regulator, providing current
up to 200mA. An additional adjustable linear-regulator
driver with an external pnp transistor may be used with
a secondary winding to provide a 12V supply, or pow-
ered directly from the main outputs to generate low-
voltage outputs as low as 1V.
Independent enable controls and power-good signals
PART
MAX8744 ETJ+
MAX8745 ETJ+
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
32 Thin QFN
(5mm x 5mm)
32 Thin QFN
(5mm x 5mm)
PKG
CODE
T3255-4
T3255-4
allow flexible power sequencing. Voltage soft-start
gradually ramps up the output voltage and reduces
inrush current, while soft-shutdown gradually ramps the
output voltage down, preventing negative voltage dips.
The MAX8744/MAX8745 feature output undervoltage
and thermal-fault protection. The MAX8744 also
includes output overvoltage-fault protection.
+Denotes lead-free package.
TOP VIEW
Pin Configuration
The MAX8744/MAX8745 are available in a 32-pin, 5mm
24
23
22
21
20
19
18
17
x 5mm, thin QFN package. The exposed backside pad
improves thermal characteristics for demanding linear
keep-alive applications.
DH3 25
BST3 26
PGOOD3 27
16
15
14
DH5
BST5
PGOOD5
Main Power Supplies
Applications
CSL3 28
CSH3 29
MAX8744
MAX8745
13
12
CSL5
CSH5
2 to 4 Li+ Cell Battery-Powered Devices
FB3 30
11
FB5
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
FBA 31
OUTA 32
+
10
9
SKIP
FSEL
1
2
3
4
5
6
7
8
Dual Mode is a trademark of Maxim Integrated Products, Inc.
THIN QFN
5mm x 5mm
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8745ETJ+ | 功能描述:电流和电力监控器、调节器 Quad-Out Main Power Supply Controller 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 |
| MAX8745ETJ+T | 功能描述:电流和电力监控器、调节器 Quad-Out Main Power Supply Controller 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 |
| MAX874C/D | 功能描述:基准电压& 基准电流 RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| MAX874CPA | 功能描述:基准电压& 基准电流 RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
| MAX874CPA+ | 功能描述:基准电压& 基准电流 RoHS:否 制造商:STMicroelectronics 产品:Voltage References 拓扑结构:Shunt References 参考类型:Programmable 输出电压:1.24 V to 18 V 初始准确度:0.25 % 平均温度系数（典型值）:100 PPM / C 串联 VREF - 输入电压（最大值）: 串联 VREF - 输入电压（最小值）: 分流电流（最大值）:60 mA 最大工作温度:+ 125 C 封装 / 箱体:SOT-23-3L 封装:Reel |
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