參數(shù)資料
型號(hào)： MAX738AMJA
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： Dual 4-Input Positive-NAND Gates 14-CDIP -55 to 125
中文描述： 2 A SWITCHING REGULATOR, 190 kHz SWITCHING FREQ-MAX, CDIP8
封裝： CERDIP-8
文件頁(yè)數(shù)： 11/16頁(yè)
文件大小： 229K
代理商： MAX738AMJA
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
MAX744ACPA 5V, Step-Down, Current-Mode PWM DC-DC Converters
MAX744ACWE 5V, Step-Down, Current-Mode PWM DC-DC Converters
MAX744AEPA 8-Bit Parallel-Out Serial Shift Registers 20-LCCC -55 to 125
MAX744AMJA 8-Bit Parallel-Out Serial Shift Registers 14-CDIP -55 to 125
MAX730ACPA 5V, Step-Down, Current-Mode PWM DC-DC Converters
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX738AMJA/883B 功能描述:直流/直流開(kāi)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(kāi)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
MAX738C/D 制造商:MAXIM 制造商全稱(chēng):Maxim Integrated Products 功能描述:Current-Mode SMPS Controller
MAX738CPA 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 NULL RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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
MAX738CWE 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 NULL RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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
MAX738CWE-T 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 NULL RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)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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