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| 型号： | MAX8742EAI+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/34页 |
| 文件大小： | 0K |
| 描述： | IC CNTRLR PWR SUP 28-SSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,000 |
| 应用： | 控制器，笔记本电脑电源系统 |
| 输入电压： | 4.2 V ~ 30 V |
| 输出数： | 2 |
| 输出电压： | 3.3V，5V，2.5 V ~ 5.5 V |
| 工作温度： | 0°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SSOP（0.209"，5.30mm 宽） |
| 供应商设备封装： | 28-SSOP |
| 包装： | 带卷 (TR) |
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500kHz Multi-Output Power-Supply Controllers
with High Impedance in Shutdown
Standard Application Circuit
The basic MAX8741 dual-output 3.3V/5V buck converter
(Figure 1) is easily adapted to meet a wide range of
applications with inputs up to 28V by substituting com-
ponents from Table 1. These circuits represent a good
set of tradeoffs between cost, size, and efficiency,
while staying within the worst-case specification limits
for stress-related parameters, such as capacitor ripple
current. Do not change the frequency of these circuits
without first recalculating component values (particularly
inductance value at maximum battery voltage). Adding
a Schottky rectifier across each synchronous rectifier
improves the efficiency of these circuits by approxi-
mately 1%, but this rectifier is otherwise not needed
because the MOSFETs required for these circuits typi-
cally incorporate a high-speed silicon diode from drain
to source. Use a Schottky rectifier rated at a DC current
Detailed Description
The MAX8741/MAX8742 are dual, BiCMOS, switch-
mode power-supply controllers designed primarily for
buck-topology regulators in battery-powered applica-
tions where high-efficiency and low-quiescent supply
current are critical. Light-load efficiency is enhanced by
automatic idle-mode operation, a variable-frequency
pulse-skipping mode that reduces transition and gate-
charge losses. Each step-down, power-switching cir-
cuit consists of two n-channel MOSFETs, a rectifier,
and an LC output filter. The output voltage is the aver-
age AC voltage at the switching node, which is regulat-
ed by changing the duty cycle of the MOSFET
switches. The gate-drive signal to the n-channel high-
side MOSFET must exceed the battery voltage, and is
provided by a flying-capacitor boost circuit that uses a
100nF capacitor connected to BST_.
equal to at least one-third of the load current.
Table 1. Component Selection for Standard 3.3V/5V Application
COMPONENT
Input Range
Frequency
Q1, Q3 High-Side
MOSFETs
Q2, Q4 Low-Side
MOSFETs with Integrated
Schottky Diodes
C3 Input Capacitor
C1 Output Capacitor
C2 Output Capacitor
R1, R2 Resistors
L1 Inductor
L2 Inductor
4A/333kHz
7V to 24V
333kHz
1/2 Fairchild FDS6982S or
1/2 International Rectifier
IRF7901D1
1/2 Fairchild FDS6982S or
1/2 International Rectifier
IRF7901D1
3 x 10μF, 25V ceramic
Taiyo Yuden TMK432BJ106KM
150μF, 6V POSCAP
Sanyo 6TPC150M
2 x 150μF, 4V POSCAP
Sanyo 4TPC150M
0.018 Ω
Dale WSL2512-R018-F
10μH, 4.5A Ferrite
Sumida CDRH124-100
7.0μH, 5.2A Ferrite
Sumida CEI122-H-7R0
LOAD CURRENT
4A/500kHz
7V to 24V
500kHz
1/2 Fairchild FDS6982S or
1/2 International Rectifier
IRF7901D1
1/2 Fairchild FDS6982S or
1/2 International Rectifier
IRF7901D1
3 x 10μF, 25V ceramic
Taiyo Yuden TMK432BJ106KM
150μF, 6V POSCAP
Sanyo 6TPC150M
2 x 150μF, 4V POSCAP
Sanyo 4TPC150M
0.018 Ω
Dale WSL2512-R018-F
7.0μH, 5.2A Ferrite
Sumida CEI122-H-7R0
5.6μH, 5.2A Ferrite
Sumida CEI122-H-5R6
6A/500kHz
7V to 24V
500kHz
Fairchild FDS6612A or
International Rectifier
IRF7807V
Fairchild FDS6670S or
International Rectifier
IRF7807DV1
4 x 10μF, 25V ceramic
Taiyo Yuden TMK432BJ106KM
2 x 150μF, 6V POSCAP
Sanyo 6TPC150M
2 x 220μF, 4V POSCAP
Sanyo 4TPC220M
0.012 Ω
Dale WSL2512-R012-F
4.2μH, 6.9A Ferrite
Sumida CEI122-H-4R2
4.2μH, 6.9A Ferrite
Sumida CEI122-H-4R2
12
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相关代理商/技术参数 |
参数描述 |
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| MAX8743EEI | 功能描述:电流型 PWM 控制器 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 |
| MAX8743EEI+ | 功能描述:电流型 PWM 控制器 Dual Step-Down 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 |
| MAX8743EEI+T | 功能描述:电流型 PWM 控制器 Dual Step-Down 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 |
| MAX8743EEI-T | 功能描述:电流型 PWM 控制器 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 |
| MAX8743ETX | 功能描述:电流型 PWM 控制器 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 |
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