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参数资料
| 型号： | MIC2193BM |
| 厂商： | Micrel Inc |
| 文件页数： | 6/10页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 8-SOIC |
| 标准包装： | 95 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 440kHz |
| 占空比： | 100% |
| 电源电压： | 2.9 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： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
MIC2193
Functional Diagram
C DECOUP
C IN
V IN
Micrel
VIN
1
VREF
1.245V
OVERCURRENT
COMPARATOR
R SENSE
VDD
5
VDD
BIAS
GAIN
3
4
CSL
ON
CURRENT
SENSE
AMP
VIN
fs/4
CONTROL
8
OUTP
Q1
L1
V OUT
OSC
RESET
7
OUTN
Q2
D1
C OUT
SLOPE
COMPENSATION
∑
PWM
COMPARATOR
gm = 0.0002 V REF
gain = 20
COMP
2
ERROR
fs/4
100k
FREQUENCY
AMP
0.3V
3
6
FB
GND
FOLDBACK
Figure 1. MIC2193 Block Diagram
Functional Characteristics
Controller Overview and Functional Description
The MIC2193 is a BiCMOS, switched mode, synchronous
step down (buck) converter controller. It uses both N- and P-
channel MOSFETs, which allows the controller to operate at
100% duty cycle and eliminates the need for a high-side drive
boot-strap circuit. Current mode control is used to achieve
superior transient line and load regulation. An internal correc-
tive ramp provides slope compensation for stable operation
above a 50% duty cycle. The controller is optimized for high
efficiency, high performance DC-DC converter applications.
Figure 1 is a block diagram of the MIC2193 configured as a
synchronous buck converter. At the beginning of the switch-
ing cycle, the OUTP pin pulls low and turns on the high-side
P-Channel MOSFET, Q1. Current flows from the input to the
output through the current sense resistor, MOSFET, and
inductor. The current amplitude increases, controlled by the
inductor. The voltage developed across the current sense
resistor, R SENSE , is amplified inside the MIC2193 and com-
bined with an internal ramp for stability. This signal is com-
pared to the output of the error amplifier. When the current
signal equals the error voltage signal, the P-channel MOSFET
is turned off. The inductor current flows through the diode, D1,
until the synchronous, N-channel MOSFET turns on. The
voltage drop across the MOSFET is less than the forward
voltage drop of the diode, which improves the converter
efficiency. At the end of the switching period, the synchro-
nous MOSFET is turned off and the switching cycle repeats.
M9999-042704
6
April 2004
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2193BM TR | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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 ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| MIC2193PM | 制造商:Micrel Inc 功能描述: |
| MIC2193YM | 功能描述:DC/DC 开关控制器 SO-8 3V Synchronous Buck Contoller (Lead Free) 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 |
| MIC2193YM TR | 功能描述:DC/DC 开关控制器 SO-8 3V Synchronous Buck Contoller (Lead Free) 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 |
| MIC2193YM-TR | 功能描述:Buck Regulator Positive Output Step-Down DC-DC Controller IC 8-SOIC 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 输出类型:晶体管驱动器 功能:降压 输出配置:正 拓扑:降压 输出数:1 输出阶段:1 电压 - 电源（Vcc/Vdd）:2.9 V ~ 14 V 频率 - 开关:400kHz 占空比（最大）:1 同步整流器:是 时钟同步:无 串行接口:- 控制特性:- 工作温度:-40°C ~ 125°C （TJ） 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商器件封装:8-SOIC 标准包装:1 |
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