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参数资料
| 型号： | MAX639CPA |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V/ADJ 225MA 8DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 两者兼有 |
| 输出数： | 1 |
| 输出电压： | 5V，1.3 V ~ 11.5 V |
| 输入电压： | 4 V ~ 11.5 V |
| 电流 - 输出： | 225mA |
| 同步整流器： | 无 |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 8-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
| 供应商设备封装： | 8-PDIP |
| 其它名称： | Q724982 |
5V/3.3V/3V/Adjustable, High-Efficiency,
Low I Q , Step-Down DC-DC Converters
Low-Battery Detector
The low-battery detector compares the voltage on the
LBI input with the internal 1.28V reference. LBO goes
Table 1. Component Suppliers
INDUCTORS — THROUGH HOLE
low whenever the input voltage at LBI is less than
1.28V. Set the low-battery detection voltage with resis-
tors R1 and R2 (Figure 3) as determined by the follow-
ing formula:
R1 = R2 [(VLB / LBI Threshold) - 1]
where R2 is any resistance in the 10k ? to 1M ? range
(typically 100k ? ), the LBI threshold is typically 1.28V,
and VLB is the desired low-battery detection voltage.
The low-battery comparator remains active in shutdown
PART
NUMBER
MAXL001*
7300-13**
7300-15**
7300-17**
7300-19**
7300-21**
7300-25**
SIZE
(inches)
0.65 x 0.33 dia.
0.63 x 0.26 dia.
0.63 x 0.26 dia.
0.63 x 0.26 dia.
0.63 x 0.26 dia.
0.63 x 0.26 dia.
0.63 x 0.26 dia.
VALUE
(μH)
100
100
150
220
330
470
1000
I MAX
(A)
1.75
0.89
0.72
0.58
0.47
0.39
0.27
SERIES R
( ? )
0.2
0.27
0.36
0.45
0.58
0.86
2.00
mode.
Shutdown Mode
Bringing SHDN below 0.8V places the MAX639/
MAX640/MAX643 in shutdown mode. LX becomes high
impedance, and the voltage at VOUT falls to zero. The
* Maxim Integrated Products
**Caddell-Burns
258 East Second Street
Mineola, NY 11501-3508
(516) 746-2310
INDUCTORS — SURFACE MOUNT
time required for the output to rise to its nominal regu-
lated voltage when brought out of shutdown (start-up
time) depends on the inductor value, input voltage, and
load current (see the Start-Up Time vs. Output Current
graph in the Typical Operating Characteristics ). The
low-battery comparator remains active in shutdown
mode.
__________Applications Information
PART
NUMBER
CD54
CD54
CDR74
CDR74
CDR105
CDR105
SIZE
(mm)
5.2 x 5.8 x 4.5
5.2 x 5.8 x 4.5
7.1 x 7.7 x 4.5
7.1 x 7.7 x 4.5
9.2 x 10.0 x 5.0
9.2 x 10.0 x 5.0
VALUE
(μH)
100
220
100
220
100
220
I MAX
(A)
0.52
0.35
0.52
0.35
0.80
0.54
SERIES R
( ? )
0.63
1.50
0.51
0.98
0.35
0.69
Inductor Selection
When selecting an inductor, consider these four factors:
peak-current rating, inductance value, series resistance,
and size. It is important not to exceed the inductor’s
Sumida Electric (USA)
637 East Golf Road
Arlington Heights, IL 60005
(708) 956-0666
CAPACITORS — LOW ESR
peak-current rating. A saturated inductor will pull exces-
sive currents through the MAX639/MAX640/MAX653’s
switch, and may cause damage. Avoid using RF chokes
or air-core inductors since they have very low peak-cur-
rent ratings. Electromagnetic interference must not upset
nearby circuitry or the regulator IC. Ferrite-bobbin types
PART
NUMBER
MAXC001*
267 Series**
267 Series**
SIZE
(inches)
0.49 x 0.394 dia.
D SM packages
E SM packages
VALUE
(μF)
150
47
100
ESR
( ? )
0.2
0.2
0.2
V MAX
(V)
35
10
6.3
work well for most digital circuits; toroids or pot cores
work well for EMI-sensitive analog circuits.
Recall that the inductance value determines I PEAK for all
input voltages (Equation 3). If there are no resistive loss-
es and the diode is ideal, the maximum average current
* Maxim Integrated Products
**Matsuo Electronics
2134 Main Street
Huntington Beach, CA 92648
(714) 969-2491
SCHOTTKY DIODES — SURFACE MOUNT
that can be drawn from the MAX639/MAX640/MAX653
will be one-half I PEAK . With the real losses in the switch,
inductor, and diode taken into account, the real maxi-
mum output current typically varies from 90% to 50% of
PART
NUMBER
SE014
SE024
SIZE
SOT89
SOT89
V F
(V)
0.55
0.55
I MAX
(A)
1
0.95
the ideal. The following steps describe a conservative
way to pick an appropriate inductor.
Step 1: Decide on the maximum required output
current, in amperes: I OUTMAX .
Step 2: I PEAK = 4 x I OUTMAX .
Collmer Semiconductor
14368 Proton Road
Dallas, TX 75244
(214) 233-1589
NOTE: This list does not constitute an endorsement by Maxim
Integrated Products and is not intended to be a comprehensive
list of all manufacturers of these components.
_______________________________________________________________________________________
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX639CPA+ | 功能描述:直流/直流开关转换器 5/3.3/3V Adjustable Step-Down 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 |
| MAX639CSA | 功能描述:直流/直流开关转换器 5/3.3/3V Adjustable Step-Down 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 |
| MAX639CSA+ | 功能描述:直流/直流开关转换器 5/3.3/3V Adjustable Step-Down 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 |
| MAX639CSA+T | 功能描述:直流/直流开关转换器 5/3.3/3V Adjustable Step-Down 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 |
| MAX639CSA-T | 功能描述:直流/直流开关转换器 5/3.3/3V Adjustable Step-Down 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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