參數(shù)資料
型號(hào)： MAX738A
廠商： Maxim Integrated Products, Inc.
元件分類： DC/DC變換器
英文描述： 5V, Step-Down, Current-Mode PWM DC-DC Converters
中文描述： 5V、降壓型、電流模式PWM DC-DC轉(zhuǎn)換器
文件頁數(shù)： 11/16頁
文件大?。?/td> 229K
代理商： MAX738A
Printed Circ uit Layouts
A good layout is essential for clean, stable operation.
The layouts and component placement diagrams given
in Figures 4, 5, 6, and 7 have been successfully tested
over a wide range of operating conditions. Note that the
1μF bypass capacitor (C2) must be positioned as close
to the V+ and GND pins as possible. Also, place the out-
put capacitor as close to the OUT and GND pins as pos-
sible. The traces connecting the input and output filter
capacitors and the catch diode must be short to mini-
mize inductance and capacitance. For this reason, avoid
using sockets, and solder the IC directly to the PC
board. Use an uninterrupted ground plane if possible.
Output-Ripple Filtering
A simple lowpass pi-filter (Figure 3) can be added to
the output to reduce output ripple to about 5mVp-p.
The cutoff frequency shown is 21kHz. Since the filter
inductor is in series with the circuit output, its resis-
tance should be minimized so the voltage drop across
it is not excessive.
M
5V, S tep-Down,
Current-Mode PWM DC-DC Converters
______________________________________________________________________________________
11
Table 2. Component Values and Suppliers
MAX730AC/MAX738AC/MAX744AC
Commercial Temp. Range
MAX730AE/M, MAX738AE/M, MAX744AE/M
Wide Temp. Range
Surface
Mount
C3 = 68μF, 16V
C4 = 100μF, 6.3V
Matsuo (714) 969-2491
267 series
Sprague (603) 224-1961
595D/293D series
L1 = 33μH
Sumida (708) 956-0666
CD54-330N (MAX730AC)
CD105-330N
(MAX738AE/M, MAX744AE/M)
Coiltronics (407) 241-7876
CTX50 series
C3 = 68μF, 16V
C4 = 100μF, 6.3V
Matsuo (714) 969-2491
267 series
Sprague (603) 224-1961
595D/293D series
Miniature
Through-
Hole
L1 = 33μH to 100μH
Sumida (708) 956-0666
RCH654-101K (MAX730A)
RCH895-101K
(MAX738A/MAX744A)
C3 = 150μF, 16V
C4 = 150μF, 16V or
390μF, 6.3V
Nichicon (708) 843-7500
PL series
Low-ESR electrolytics
L1 = 33μH
Sumida (708) 956-0666
RCH654-330M (MAX730A)
RCH895-330M
(MAX738A/MAX744A)
Low-Cost
Through-
Hole
Inductors
Capacitors
Inductors
Capacitors
Production
Method
L1 = 33μH to 100μH
Sumida (708) 956-0666
CD54-101KC (MAX730AC)
CD105-101KC
(MAX738AC/MAX744AC)
Coiltronics (407) 241-7876
CTX100 series
C3 = 150μF, 16V
C4 = 220μF, 10V
Sanyo (619) 661-6322
OS-CON series
Low-ESR
organic semiconductor
(Rated from -55°C to +105°C)
Mallory (317) 273-0090
THF series
C3 = 100μF, 20V
C4 = 220μF, 10V
(Rated from -55°C to +125°C)
L1 = 100μH
Maxim
MAXL001
100μH iron-power toroid
Renco (516) 586-5566
RL1284-100
C3 = 150μF, 16V
C4 = 390μF, 6.3V
Maxim
MAXC001
150μF, low-ESR
electrolytic
United Chemicon
(708) 843-7500
相關(guān)PDF資料
PDF描述
MAX744A 5V, Step-Down, Current-Mode PWM DC-DC Converters
MAX738AEWE LJT 37C 37#22D SKT PLUG
MAX744AEWE Circular Connector; No. of Contacts:26; Series:MS27467; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:17; Circular Contact Gender:Pin; Circular Shell Style:Straight Plug; Insert Arrangement:17-26 RoHS Compliant: No
MAX738ACWE Replaced by SN54197 : 50/30/100-Mhz Presettable Decade OR Binary Counters/Latches 14-CFP -55 to 125
MAX738AEPA Dual 4-Input Positive-NAND Gates 20-LCCC -55 to 125
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX738AC/D 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 DICE SALES DICE RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX738AC/D DIE 制造商:Maxim Integrated Products 功能描述:
MAX738ACPA 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 5V Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX738ACPA+ 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 5V Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
MAX738ACWE 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 5V Step-Down DC/DC Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
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