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参数资料
| 型号： | MAX8640YEXT25+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 2.5V .5A SC70-6 |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 2.5V |
| 输入电压： | 2.7 V ~ 5.5 V |
| 频率 - 开关： | 2MHz |
| 电流 - 输出： | 500mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-TSSOP，SC-88，SOT-363 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SC-70-6 |
Tiny 500mA, 4MHz/2MHz Synchronous
Step-Down DC-DC Converters
Soft-Start
The MAX8640Y/MAX8640Z include internal soft-start
circuitry that eliminates inrush current at startup, reduc-
ing transients on the input source. Soft-start is particu-
larly useful for higher impedance input sources, such
as Li+ and alkaline cells. See the Soft-Start Response
in the Typical Operating Characteristics.
Applications Information
The MAX8640Y/MAX8640Z are optimized for use with a
tiny inductor and small ceramic capacitors. The correct
selection of external components ensures high efficien-
cy, low output ripple, and fast transient response.
Inductor Selection
A 1μH inductor is recommended for use with the
MAX8640Z, and 2.2μH is recommended for the
MAX8640Y. A 1μH inductor is physically smaller but
requires faster switching, resulting in some efficiency
loss. Table 1 lists several recommended inductors.
Table 1. Suggested Inductors
It is acceptable to use a 1.5μH inductor with either the
MAX8640Y or MAX8640Z, but efficiency and ripple
should be verified. Similarly, it is acceptable to use a
3.3μH inductor with the MAX8640Y, but performance
should be verified.
For optimum voltage positioning of load transients,
choose an inductor with DC series resistance in the
75m Ω to 150m Ω range. For higher efficiency at heavy
loads (above 200mA) or minimal load regulation (but
some transient overshoot), the resistance should be
kept as low as possible. For light-load applications up
to 200mA, higher resistance is acceptable with very lit-
tle impact on performance.
Capacitor Selection
Output Capacitor
The output capacitor, C2, is required to keep the output
voltage ripple small and to ensure regulation loop sta-
bility. C2 must have low impedance at the switching fre-
quency. Ceramic capacitors are recommended due to
MANUFACTURER
FDK
SERIES
MIPFT2520D
MIPF2520D
INDUCTANCE
(μH)
2.0
1.5
2.2
DC RESISTANCE
( Ω typ)
0.16
0.07
0.08
CURRENT RATING
(mA)
900
1500
1300
DIMENSIONS
L x W x H (mm)
2.5 x 2.0 x 0.5
2.5 x 2.0 x 1.0
3.3
1.0
0.10
0.12
1200
1200
Murata
LQM31P
1.5
0.16
1000
3.2 x 1.6 x 0.95
2.2
1.2
0.22
0.08
900
590
Sumida
CDRH2D09
1.5
0.09
520
3.0 x 3.0 x 1.0
2.2
1.0
0.12
0.11
440
1100
Taiyo Yuden
CKP3216T
1.5
0.13
1000
3.2 x 1.6 x 0.9
2.2
0.14
900
GLF201208T
1.0
2.2
0.15
0.36
460
300
2.0 x 1.25 x 0.9
TDK
TOKO
GLF2012T
GLF251812T
MDT2520-CR
D2812C
1.0
2.2
1.0
2.2
1.0
2.2
1.0
2.2
0.07
0.10
0.10
0.20
0.05
0.08
0.07
0.14
400
300
800
600
1000
700
1100
770
2.0 x 1.25 x 1.35
2.5 x 1.8 x 1.35
2.5 x 2.0 x 1.0
2.8 x 2.8 x 1.2
6
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX8640ZELT12+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX8640ZELT12+T | 功能描述:直流/直流开关转换器 500mA 4/2MHz Synch Step-Down DC/DC Conv RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX8640ZELT15+T | 制造商:Maxim Integrated Products 功能描述: |
| MAX8640ZELT18+T | 功能描述:直流/直流开关转换器 500mA 4/2MHz Synch Step-Down DC/DC Conv RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MAX8640ZELT19+T | 功能描述:直流/直流开关转换器 500mA 4/2MHz Synch Step-Down DC/DC Conv RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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