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参数资料
| 型号： | MAX1651CPA |
| 厂商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | 5V/3.3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers |
| 中文描述： | SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封装： | PLASTIC, DIP-8 |
| 文件页数： | 11/12页 |
| 文件大小： | 167K |
| 代理商： | MAX1651CPA |
Input Bypass Capacitor
The input bypass capacitor reduces peak currents
drawn from the voltage source, and also reduces the
amount of noise at the voltage source caused by the
switching action of the MAX1649/MAX1651. The input
voltage source impedance determines the size of the
capacitor required at the V+ input. As with the output fil-
ter capacitor, a low-ESR capacitor is recommended.
Bypass the IC separately with a 0.1μF ceramic capac-
itor placed close to the V+ and GND pins.
Reference Capacitor
Bypass REF with a 0.1μF or larger capacitor.
M
5V /3.3V or Adjustable, High-Effic ienc y,
Low-Dropout, S tep-Down DC-DC Controllers
______________________________________________________________________________________
11
___________________Chip Topography
TRANSISTOR COUNT: 428
SUBSTRATE CONNECTED TO V+
0.106"
(2.692mm)
0.081"
(2.057mm)
OUT
GND
CS
EXT
V+
FB
SHDN
REF
Table 2. Component Suppliers
COMPANY
PHONE
(207) 282-5111
or
(800) 282-4975
(407) 241-7876
(708) 639-6400
(402) 564-3131
FAX
AVX
USA
(207) 283-1941
Coiltronics
CoilCraft
Dale
International
Rectifier
IRC
USA
USA
USA
(407) 241-9339
(708) 639-1469
(402) 563-1841
USA
(310) 322-3331
(310) 322-3332
USA
(512) 992-7900
(602) 244-3576
or
(602) 244-5303
(708) 843-7500
81-7-5231-8461
(805) 867-2555
81-3-3494-7411
(619) 661-6835
81-7-2070-6306
(408) 988-8000
or
(800) 554-5565
(603) 224-1961
(708) 956-0666
81-3-3607-5111
(512) 992-3377
Motorola
USA
(602) 244-4015
Nichicon
USA
J apan
USA
J apan
USA
J apan
(708) 843-2798
81-7-5256-4158
(805) 867-2556
81-3-3494-7414
(619) 661-1055
81-7-2070-1174
Nihon
Sanyo
Siliconix
USA
(408) 970-3950
Sprague
USA
USA
J apan
(603) 224-1430
(708) 956-0702
81-3-3607-5144
Sumida
United
Chemi-Con
USA
(714) 255-9500
(714) 255-9400
Layout Considerations
Proper PC board layout is essential because of high
current levels and fast switching waveforms that radi-
ate noise. Minimize ground noise by connecting the
anode of the rectifier, the input bypass capacitor
ground lead, and the output filter capacitor ground
lead to a single point (“star” ground configuration). A
ground plane is recommended. Also minimize lead
lengths to reduce stray capacitance, trace resistance,
and radiated noise. In particular, the traces connected
to FB (if an external resistor divider is used) and EXT
must be short. Place the 0.1μF ceramic bypass capac-
itor as close as possible to the V+ and GND pins.
MAX 1649/MAX 1651 vs. MAX 649/MAX 651
The MAX1649 and MAX1651 are pin compatible with
the MAX649 and MAX651, but have been optimized for
improved dropout performance and efficiency—partic-
ularly with low input voltages. The MAX1649/MAX1651
feature increased maximum switch duty cycle (96.5%)
and reduced current-limit sense voltage (110mV).
Their predecessors, the MAX649/MAX651, use a high-
er two-step (210mV/110mV) current-limit sense voltage
to provide tighter current-sense accuracy and reduced
inductor peak current at light loads.
相关PDF资料 |
PDF描述 |
|---|---|
| MAX1651CSA | 5V/3.3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers |
| MAX1651EPA | 5V/3.3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers |
| MAX1651ESA | 5V/3.3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers |
| MAX1649CPA | 5V/3.3V or Adjustable, High-Efficiency, Low-Dropout, Step-Down DC-DC Controllers |
| MAX1652 | High-Efficiency, PWM, Step-Down DC-DC Controllers in 16-Pin QSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1651CSA | 功能描述:DC/DC 开关控制器 5/3.3/Adj Low-Drop Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1651CSA+ | 功能描述:DC/DC 开关控制器 5/3.3/Adj Low-Drop Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1651CSA+T | 功能描述:DC/DC 开关控制器 5/3.3/Adj Low-Drop Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1651CSA-T | 功能描述:DC/DC 开关控制器 5/3.3/Adj Low-Drop Step-Down RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MAX1651EPA | 功能描述:DC/DC 开关控制器 RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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