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| 型号： | MIC4681-5.0BM |
| 厂商： | Micrel Inc |
| 文件页数： | 1/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 1A 8SOIC |
| 标准包装： | 380 |
| 系列： | SuperSwitcher™ |
| 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： | 4 V ~ 30 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
MIC4681
General Description
Micrel
MIC4681
2A-Peak SuperSwitcher? SOP-8 Buck Regulator
Features
The MIC4681 SuperSwitcher? is an easy-to-use step-down
(buck) voltage-mode switching regulator. The 200kHz
MIC4681 achieves over 1A of continuous output current over
a 4V to 30V input range in an 8-lead SOPpackage . The
MIC4681 features a high 2.1A minimum current limit, making
the device ideal for pulsed current applications such as GSM
and TDMA cell phone battery chargers and power supplies.
The MIC4681 sustains an output of 4.2V/2A within a typical
GSM charging environment.
The MIC4681 has an input voltage range of 4V to 30V, with
excellent line, load, and transient response. The regulator
performs cycle-by-cycle current limiting and thermal shut-
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SO-8 package with over 1A continuous output current
Capable of 2A pulse charging for GSM applications
All surface mount solution
Only 4 external components required
Fixed 200kHz operation
Output adjustable down to 1.25V
Internally compensated with fast transient response
Wide 4V to 30V operating input voltage range
Less than 6 μ A typical shutdown-mode current
Up to 90% efficiency
Thermal shutdown
Overcurrent protection
down for protection under fault conditions. In shutdown
mode, the regulator draws less than 6 μ A of standby current.
The MIC4681 SuperSwitcher? regulator requires a mini-
mum number of external components and can operate using
a standard series of inductors and capacitors. Frequency
compensation is provided internally for fast transient re-
sponse and ease of use.
The MIC4681 is available in the 8-lead SOP with a
–40 ° C to +125 ° C junction temperature range.
Applications
? Cellular phone battery charger
? Cellular phone power supply
? Simple 1A continuous high-efficiency step-down (buck)
regulator
? Replacement of a TO-220 and TO-263 designs
? Positive-to-negative converter (inverting buck-boost)
? Negative boost converter
? Higher output current regulator using external FET
Typical Applications
+5V to +30V
C1
22 μ F
SHUTDOWN 35V
ENABLE
Power
SOP-8
2
1
MIC4681BM
IN SW
SHDN FB
GND
5 – 8
3
4
L1
68 μ H
D1
B340A or
SS36
R1
3.01k
R2
2.94k
2.5V/1A
C2
220 μ F
10V
Adjustable Regulator Circuit
SuperSwitcher is a trademark of Micrel, Inc.
Micrel, Inc. ? 1849 Fortune Drive ? San Jose, CA 95131 ? USA ? tel + 1 (408) 944-0800 ? fax + 1 (408) 474-1000 ? http://www.micrel.com
April 2005
1
MIC4681
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC4681BM | 功能描述:IC REG BUCK ADJ 1A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:SuperSwitcher™ 标准包装:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
| MIC4681BM TR | 功能描述:IC REG BUCK ADJ 1A 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:SuperSwitcher™ 标准包装:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
| MIC4681YM | 功能描述:直流/直流开关调节器 2A Peak SuperSwitcher in SO-8 (Lead Free) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC4681YM TR | 功能描述:直流/直流开关调节器 2A Peak SuperSwitcher in SO-8 (Lead Free) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC4682 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:PRECISION CURRENT LIMIT SO-8 SUPERSWITCHER BUCK REGULATOR |
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