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| 型号： | MAX744AEWE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 0.75A 16SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 1,000 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 6 V ~ 16 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 185kHz |
| 电流 - 输出： | 750mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SOIC（0.295"，7.50mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-SOIC W |
5V, Step-Down,
Current-Mode PWM DC-DC Converters
Table 2. Component Values and Suppliers
Production
Method
MAX730AC/MAX738AC/MAX744AC
Commercial Temp. Range
MAX730AE/M, MAX738AE/M, MAX744AE/M
Wide Temp. Range
Inductors
L1 = 33μH to 100μH
Sumida (708) 956-0666
Capacitors
C3 = 68μF, 16V
C4 = 100μF, 6.3V
Inductors
L1 = 33μH
Sumida (708) 956-0666
Capacitors
C3 = 68μF, 16V
C4 = 100μF, 6.3V
Surface
Mount
CD54-101KC (MAX730AC)
CD105-101KC
(MAX738AC/MAX744AC)
Coiltronics (407) 241-7876
CTX100 series
Matsuo (714) 969-2491
267 series
Sprague (603) 224-1961
595D/293D series
CD54-330N (MAX730AC)
CD105-330N
(MAX738AE/M, MAX744AE/M)
Coiltronics (407) 241-7876
CTX50 series
Matsuo (714) 969-2491
267 series
Sprague (603) 224-1961
595D/293D series
C3 = 150μF, 16V
C4 = 220μF, 10V
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)
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)
C3 = 150μF, 16V
L1 = 100μH
C4 = 390μF, 6.3V
Low-Cost
Through-
Hole
Maxim
MAXL001
100μH iron-power toroid
Renco (516) 586-5566
RL1284-100
Maxim
MAXC001
150μF, low-ESR
electrolytic
United Chemicon
(708) 843-7500
Printed Circuit 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.
______________________________________________________________________________________
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