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参数资料
| 型号： | MAX1744AUB/V+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 12/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM 10-UMAX |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| PWM 型： | 控制器 |
| 输出数： | 1 |
| 频率 - 最大： | 330kHz |
| 占空比： | 100% |
| 电源电压： | 4.5 V ~ 36 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
High-Voltage, Step-Down DC-DC
Controllers in μMAX
Table 1. Component Suppliers
Capacitor Selection
Choose filter capacitors to service input and output
COMPANY
AVX
COUNTRY
USA
PHONE
803-946-0690
or
FAX
803-626-3123
peak currents with acceptable voltage ripple. ESR in
the output capacitor is a major contributor to output rip-
ple, so low-ESR capacitors are recommended. Low-
ESR tantalum, polymer, or ceramic capacitors are best.
800-282-4975
Low-ESR aluminum electrolytic capacitors are tolera-
Coilcraft
Coiltronics
Dale/Vishay
Kemet
International
Rectifier
IRC
Motorola
Nichicon
Nihon
USA
USA
USA
USA
USA
USA
USA
USA
Japan
USA
Japan
847-639-6400
516-241-7876
402-564-3131
408-986-0424
310-322-3331
512-992-7900
602-303-5454
847-843-7500
81-7-5231-8461
805-867-2555
81-3-3494-7411
847-639-1469
516-241-9339
402-563-6418
408-986-1442
310-322-3332
512-992-3377
602-994-6430
847-843-2798
81-7-5256-4158
805-867-2698
81-3-3494-7414
ble, but standard aluminum electrolytic capacitors are
not recommended.
Voltage ripple is the sum of contributions from ESR and
the capacitor value:
V RIPPLE ≈ V RIPPLE , ESR + V RIPPLE , C
For tantalum capacitors, the ripple is determined by the
ESR, but for ceramic capacitors, the ripple is mostly
due to the capacitance. Voltage ripple as a conse-
quence of ESR is approximated by:
V RIPPLE,ESR ≈ ( R ESR ) Δ Ip ? p
The ripple due to the capacitance is approximately:
Sanyo
USA
Japan
619-661-6835
81-7-2070-6306
408-988-8000
619-661-1055
81-7-2070-1174
V RIPPLE,C ≈
LI 2 PEAK
2CV O
Siliconix
USA
or
408-970-3950
Estimate input and output capacitor values for given
800-554-5565
voltage ripple as follows:
Sprague
USA
603-224-1961
603-224-1430
1 LI 2
V RIPPLE , CIN IN
Sumida
USA
Japan
847-956-0666
81-3-3607-5111
847-956-0702
81-3-3607-5144
C IN =
2 Δ L
V
1 LI 2 ? ?
United
Chemi-Con
USA
714-255-9500
714-255-9400
C OUT =
? ?
V RIPPL E , COUT V OUT ? V IN ? V OUT ?
2 Δ L V IN
Diode Selection
The MAX1744/MAX1745’s high switching frequency
demands a high-speed rectifier. Schottky diodes, such
as the 1N5817–1N5822 family or surface-mount equiva-
lents, are recommended. Ultra-high-speed rectifiers
with reverse recovery times around 50ns or faster
should be used for high output voltages, where the
increased forward drop causes less efficiency degra-
dation. Make sure that the diode’s peak current rating
exceeds the peak current limit set by R SENSE , and that
its breakdown voltage exceeds V IN . Schottky diodes
are preferred for heavy loads due to their low forward
voltage, especially in low-voltage applications. For
high-temperature applications, some Schottky diodes
may be inadequate due to their high leakage currents.
In such cases, ultra-high-speed rectifiers are recom-
mended, although a Schottky diode with a higher
reverse voltage rating can often provide acceptable
performance.
where I Δ L is the change in inductor current.
These equations are suitable for initial capacitor selec-
tion; final values should be set by testing a prototype or
evaluation kit. When using tantalum capacitors, use
good soldering practices to prevent excessive heat
from damaging the devices and increasing their ESR.
Also, ensure that the tantalum capacitors’ surge-current
ratings exceed the startup inrush and peak switching
currents.
Pursuing output ripple lower than the error compara-
tor’s hysteresis (0.6% of the output voltage) is not prac-
tical, since the MAX1744/MAX1745 will switch at slower
frequencies, increasing inductor ripple current thresh-
old. Choose an output capacitor with a working voltage
rating higher than the output voltage.
The input filter capacitor reduces peak currents drawn
from the power source and reduces noise and voltage
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX1744EUB | 功能描述:DC/DC 开关控制器 Step-Down DC/DC Controller 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 |
| MAX1744EUB/V+ | 功能描述:DC/DC 开关控制器 Step-Down DC/DC Controller 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 |
| MAX1744EUB/V+T | 功能描述:DC/DC 开关控制器 Step-Down DC/DC Controller 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 |
| MAX1744EUB+ | 功能描述:DC/DC 开关控制器 Step-Down DC/DC Controller 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 |
| MAX1744EUB+ | 制造商:Maxim Integrated Products 功能描述:CONTROLLER STEP DOWN DC-DC 1744 制造商:Maxim Integrated Products 功能描述:CONTROLLER, STEP DOWN, DC-DC, 1744 |
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