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| 型号： | MAX8744AETJ+T |
| 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 |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
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ATION
EVALU
AVAIL
19-0839; Rev 0; 6/07
KIT
ABLE
High-Efficiency, Quad-Output, Main Power-
Supply Controllers for Notebook Computers
General Description
Features
The MAX8744A/MAX8745A 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-frequency
operation with optimal interleaving minimizes input rip-
ple 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 MAX8744A/MAX8745A and their gate drivers, as
well as external keep-alive loads. When the main PWM
regulator is in regulation, an automatic bootstrap switch
bypasses the internal linear regulator, providing current
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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 (MAX8744A 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
up to 200mA. An additional adjustable linear-regulator
driver with an external pnp transistor can be used with
a secondary winding to provide a 12V supply, or pow-
ered directly from the main outputs to generate low-
PART
MAX8744A ETJ+
TEMP RANGE
-40°C to +85°C
PIN-
PACKAGE
32 Thin QFN
(5mm x 5mm)
PKG
CODE
T3255-4
voltage outputs as low as 1V.
Independent enable controls and power-good signals
MAX8745A ETJ+* -40°C to +85°C
32 Thin QFN
(5mm x 5mm)
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 MAX8744A/MAX8745A feature output undervoltage
and thermal-fault protection. The MAX8744A also
includes output overvoltage-fault protection.
The MAX8744A/MAX8745A are available in a 32-pin,
+Denotes a lead-free package.
*Future product—contact factory for availability.
Pin Configuration
TOP VIEW
5mm x 5mm, thin QFN package. The exposed back-
24
23
22
21
20
19
18
17
side pad improves thermal characteristics for demand-
ing linear keep-alive applications.
Applications
DH3 25
BST3 26
PGOOD3 27
16
15
14
DH5
BST5
PGOOD5
Main Power Supplies
2 to 4 Li+ Cell Battery-Powered Devices
Notebook and Subnotebook Computers
PDAs and Mobile Communicators
CSL3 28
CSH3 29
FB3 30
FBA 31
OUTA 32
+
MAX8744A
MAX8745A
13
12
11
10
9
CSL5
CSH5
FB5
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 |
|---|---|
| MAX8744AEVKIT+ | 制造商:Maxim Integrated Products 功能描述:MAX8744A EVAL KIT - Rail/Tube |
| MAX8744ETJ+ | 功能描述:电流型 PWM 控制器 Quad-Out Main Power Supply Controller RoHS:否 制造商:Texas Instruments 开关频率:27 KHz 上升时间: 下降时间: 工作电源电压:6 V to 15 V 工作电源电流:1.5 mA 输出端数量:1 最大工作温度:+ 105 C 安装风格:SMD/SMT 封装 / 箱体:TSSOP-14 |
| MAX8744ETJ+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 |
| MAX8744EVKIT | 制造商:Maxim Integrated Products 功能描述:HIGH-EFFICIENCY QUAD OUTPUT MAIN - Rail/Tube |
| MAX8744EVKIT+ | 制造商:Maxim Integrated Products 功能描述:HIGH-EFFICIENCY QUAD OUTPUT MAIN - Rail/Tube |
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