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参数资料
| 型号： | MIC5157YM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/13页 |
| 文件大小： | 271K |
| 描述： | IC REG CTRLR SGL MULTI 14SOIC |
| 标准包装： | 2,500 |
| 类型： | 正，固定式 |
| 输出数： | 1 |
| 输出电压： | 3.3V，5V，12V |
| 电流 - 电源： | 4.5mA |
| 输入电压： | 3 V ~ 36 V |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC5157YMTR MIC5157YMTR-ND |
MIC5156/5157/5158
Micrel, Inc.
MIC5156/5157/5158
10
August 2005
Current Limiting
Current sensing requires a low-value series resistance (R
s
)
between V
DD
and D (drain). Refer to the typical applications.
The internal current-limiting circuit limits the voltage drop
across the sense resistor to 35mV. Equation (2) provides the
sense resistor value required for a given maximum current.
2)
S
=
35mV
I
LIM
where:
R
S
= sense resistor value
I
LIM
= maximum output current
Most current-limited applications require low-value resistors.
See Application Hints 21 and 25 for construction hints.
Non-Current-Limited Applications
For circuits not requiring current limiting, do not use a sense
resistor between V
DD
and D (drain). See gure (3). The con-
troller will not limit current when it does not detect a 35mV
drop from V
DD
to D.
S
G
MIC5156
D
V
DD
V
IN
Figure 3. No Current Limit
3.3V Microprocessor Applications
For computer designs that use 3.3V microprocessors with 5V
logic, the FLAG output can be used to suppress the 5V sup-
ply until the 3.3V output is in regulation. Refer to the external
components shown with the MIC5156 Block Diagram.
SMPS Post Regulator Application
A Super LDO regulator can be used as a post regulator for a
switch-mode power supply. The Super LDO regulator can pro-
vide a signicant reduction in peak-to-peak ripple voltage.
High-Current Switch Application
All versions of the MIC5156/7/8 may be used for current-lim-
ited, high-current, high-side switching with or without voltage
regulation. See gure (4a). Simply leave the S terminal
open. A 16V zener diode from the gate to the source of the
MOSFET protects the MOSFET from overdrive during fault
conditions.
G
MIC5156-x.x
D
V
DD
V
IN
V
G
Gate Supply
Enable
hutdown
EN
GND
R
S
S
Figure 4a. High-Side Switch
If a MIC5157 or MIC5158 is used and is shutdown for a
given time, the charge pump reservoir V
CP
will bleed off. If
recharging the reservoir causes an unacceptable delay in the
load reaching its operating voltage, do not use the EN pin
for on/off control. Instead, use the MIC5158, hold EN high to
keep the charge pump in continuous operation, and switch
the MOSFET on or off by overriding the error amplier input
as shown in gure (4b).
GND
S
EA
MIC5158
G
EN
utput Off
utput On
1N4148
V
IN
V
DD
Figure 4b. Fast High-Side Switch
Battery Charger Application
The MIC5158 may be used in constant-current applications
such as battery chargers. See gure (5). The regulator supplies
a constant-current (35mV ?R3) until the battery approaches
the oat voltage:
FL
= 1.235 (1 + )
R1
R2
where:
V
FL
= oat voltage
At oat voltage, the MOSFET is shut off. A trickle charge is
supplied by R4.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5157YN | 功能描述:低压差控制器 - LDO Super LDO Regulator-Selectable(Lead Free) RoHS:否 制造商:Micrel 最大输入电压:5.5 V 输出电压:Adjustable 输出电流:10 mA 负载调节: 输出类型:Adjustable, Fixed 输出端数量:1 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-6 |
| MIC5158BM | 功能描述:IC REG CTRLR SGL FIX/ADJ 14SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| MIC5158BM TR | 功能描述:IC REG CTRLR SGL FIX/ADJ 14-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| MIC5158BN | 功能描述:IC REG CTRLR SGL FIX/ADJ 14-DIP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性晶体管驱动器 系列:- 产品培训模块:More Information on LDOs 标准包装:2,500 系列:- 类型:正，固定式 输出数:2 输出电压:2.8V，3.3V 电流 - 电源:12mA 输入电压:5 V ~ 22 V 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC 包装:带卷 (TR) |
| MIC5158YM | 功能描述:低压差控制器 - LDO Super LDO Regulator-5 volt/adj -(Lead Free) RoHS:否 制造商:Micrel 最大输入电压:5.5 V 输出电压:Adjustable 输出电流:10 mA 负载调节: 输出类型:Adjustable, Fixed 输出端数量:1 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-23-6 |
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