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参数资料
| 型号： | MIC3839YMM |
| 厂商： | Micrel Inc |
| 文件页数： | 2/11页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM 10-MSOP |
| 标准包装： | 100 |
| PWM 型： | 电流/电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 50% |
| 电源电压： | 2 V ~ 14 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： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1086 (CN2011-ZH PDF) |
| 其它名称： | 576-2283 MIC3839YMM-ND |
MIC3838/3839
Ordering Information
Part Number
Turn On
Turn Off
Micrel
Standard
MIC3838BMM
MIC3839BMM
Lead-Free
MIC3838YMM
MIC3839YMM
Threshold
12.5V
4.3V
Threshold
8.3V
4.1V
Temperature Range
–40 ° C to +85 ° C
–40 ° C to +85 ° C
Package
10-Pin MSOP
10-Pin MSOP
Pin Configuration
Pin Description
COMP 1
FB 2
ILIM 3
RAMP 4
RC 5
MSOP-10 (MM)
10 VREF
9 VDD
8 OUTA
7 OUTB
6 GND
Pin Number
1
2
3
4
5
Pin Name
COMP
FB
ILIM
RAMP
RC
Pin Function
COMP is the output of the error amplifier and the input of the PWM
comparator. The error amplifier in the MIC3838 is a true low-output imped-
ance, 4MHz operational amplifier. As such, the COMP pin can both source
and sink current. However, the error amplifier is internally current limited, so
that zero duty cycle can be externally forced by pulling COMP to GND.
The MIC3838 family features built-in full cycle soft start. Soft start is imple-
mented as a clamp on the maximum COMP voltage.
The inverting input to the error amplifier.
The input to the peak current, and overcurrent comparators. The
overcurrent comparator is only intended for fault sensing. Exceeding the
overcurrent threshold will cause a soft start cycle. An internal MOSFET
discharges the current sense filter capacitor to improve dynamic perfor-
mance of the power converter.
Input to the PWM comparator. Sawtooth ramp for PWM control. Allows for
either current-mode or voltage-mode control. An internal MOSFET dis-
charges the current sense filter capacitor.
The oscillator programming pin. Only two components are required to
program the oscillator, a resistor (tied between V DD and RC), and a capaci-
tor (tied between RC and GND). The approximate oscillator frequency is
determined by the simple formula:
F OSCILLATOR =
1.41
R × C
The recommended range of timing resistors is between 7k ? and 200k ? and
range of timing capacitors is between 100pF and 1000pF. Timing resistors
less than 7k ? should be avoided. For best performance, keep the leads
between components as short as possible. Separate ground and VDD
traces to the external timing network are encouraged.
6
GND
Ground. Return path for signal and gate drive functions.
MIC3838/3839
2
April 2005
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| MIC384-0BM | 功能描述:IC SUPERVSR THERM LOC/REM 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 标准包装:1 系列:- 功能:温度监控系统（传感器） 传感器类型:内部和外部 感应温度:-40°C ~ 125°C，外部传感器 精确度:±2.5°C 本地（最大值），±5°C 远程（最大值） 拓扑:ADC，比较器，寄存器库 输出类型:2 线 SMBus? 输出警报:无 输出风扇:无 电源电压:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:SOT-23-8 供应商设备封装:SOT-23-8 包装:Digi-Reel® 其它名称:296-22675-6 |
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