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参数资料
| 型号： | MIC37151-2.5BR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/13页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.5V 1.5A SPAK-5 |
| 标准包装： | 48 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.5V |
| 输入电压： | 最高 6V |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1.5A（最小） |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SPAK-5 |
| 供应商设备封装： | S-PAK-5 |
| 包装： | 管件 |
Micrel, Inc.
load current variations and input voltage variations.
Large output capacitors are not required to obtain this
performance. A standard 10μF output capacitor,
preferably tantalum, is all that is required. Larger values
help to improve performance even further.
By virtue of its low dropout voltage, this device does not
saturate into dropout as readily as similar NPN-based
designs. When converting from 3.3V to 2.5V, 2.5V to
1.8V or 1.65V, or 2.5V to 1.5V, the NPN-based
regulators are already operating in dropout, with typical
dropout requirements of 1.2V or greater. To convert
down to 2.5V without operating in dropout, NPN-based
MIC37150/51/52/53
Enable Input
The MIC37151/37152/37153 also features an enable
input for on/off control of the device. Its shutdown state
draws “zero” current (only microamperes of leakage).
The enable input is TTL/CMOS compatible for simple
logic interface, but can be connected to up to V IN . When
enabled, it draws approximately 15μA.
Adjustable Regulator Design
MIC37152
regulators require an input voltage of 3.7V at the very
least. The MIC37150/51/52/53 regulator will provide
excellent performance with an input as low as 3.0V or
2.25V, respectively. This gives the PNP-based
regulators a distinct advantage over older, NPN-based
ENABLE
SHUTDOWN
V IN
IN
EN
OUT
ADJ
GND
R1
R2
V OUT
C OUT
linear regulators.
V OUT = 1.240V (1 + )
R1 = R2 ? ? OUT ? 1 ? ?
Minimum Load Current
The MIC37150/51/52/53 regulator is speci ? ed between
? nite loads. If the output current is too small, leakage
currents dominate and the output voltage rises. A 10mA
minimum load current is necessary for proper operation.
Error Flag
The MIC37151 and MIC37153 feature an error ? ag
circuit that monitors the output voltage and signals an
error condition when the voltage 5% below the nominal
output voltage. The error ? ag is an open-collector output
that can sink 10mA during a fault condition.
Low output voltage can be caused by a number of
problems, including an overcurrent fault (device in
current limit) or low input voltage. The ? ag is inoperative
during overtemperature shutdown.
R1
R2
Figure 1. Adjustable Regulator with Resistors
The MIC37152 and MIC37153 allow programming the
output voltage anywhere between 1.24V and the 5.5V
maximum operating rating of the family. Two resistors
are used. Resistors can be quite large, up to 1M ? ,
because of the very high input impedance and low bias
current of the sense comparator: The resistor values are
calculated by:
? V ?
? 1.240 ?
Where V OUT is the desired output voltage. Figure 1
shows component de ? nition. Applications with widely
varying load currents may scale the resistors to draw the
minimum load current required for proper operation (see
above).
October 2007
10
M9999-101907
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