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参数资料
| 型号： | MIC23250-S4YMT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 0.4A DL 10TMLF |
| 标准包装： | 1 |
| 系列： | HyperLight Load® |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 2 |
| 输出电压： | 1.2V，3.3V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 混合物 |
| 频率 - 开关： | 4MHz |
| 电流 - 输出： | 400mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-UFDFN，10-TMLF? |
| 包装： | 标准包装 |
| 供应商设备封装： | 10-TMLF?（2x2） |
| 产品目录页面： | 1094 (CN2011-ZH PDF) |
| 其它名称： | 576-3561-6 |
Micrel, Inc.
HyperLight Load Mode?
The MIC23250 uses a minimum on and off time
proprietary control loop (patented by Micrel). When the
output voltage falls below the regulation threshold, the
error comparator begins a switching cycle that turns the
PMOS on and keeps it on for the duration of the minimum-
on-time. This increases the output voltage. If the output
voltage is over the regulation threshold, then the error
comparator turns the PMOS off for a minimum-off-time
until the output drops below the threshold. The NMOS acts
as an ideal rectifier that conducts when the PMOS is off.
Using a NMOS switch instead of a diode allows for lower
voltage drop across the switching device when it is on. The
asynchronous switching combination between the PMOS
MIC23250
As shown in the previous equation, the load at which
MIC23250 transitions from HyperLight Load? mode to
PWM mode is a function of the input voltage (V IN ), output
voltage (V OUT ), duty cycle (D), inductance (L) and
frequency (f). This is illustrated in the graph below. Since
the inductance range of MIC23250 is from 0.47μH to
4.7μH, the device may then be tailored to enter HyperLight
Load? mode or PWM mode at a specific load current by
selecting the appropriate inductance. For example, in the
graph below, when the inductance is 4.7μH the MIC23250
will transition into PWM mode at a load of approximately
5mA. Under the same condition, when the inductance is
1μH, the MIC23250 will transition into PWM mode at
approximately 70mA.
and the NMOS allows the control loop to work in
discontinuous mode for light load operations. In
discontinuous mode, the MIC23250 works in pulse
frequency modulation (PFM) to regulate the output. As the
output current increases, the off-time decreases, thus
10
4MHz
Switching Frequency
vs. Output Current
L = 4.7μH
? ( V IN ? V OUT ) × D ?
I LOAD > ? ?
11
providing more energy to the output. This switching
scheme improves the efficiency of MIC23250 during light
load currents by only switching when it is needed. As the
load current increases, the MIC23250 goes into
continuous conduction mode (CCM) and switches at a
frequency centered at 4MHz. The equation to calculate the
load when the MIC23250 goes into continuous conduction
mode may be approximated by the following formula:
? 2 L × f ?
June 2010
14
1
0.1
0.01
L = 1μH
L = 2.2μH
V IN = 3.6V
V OUT = 1.8V
C OUT = 4.7μF
0 100 1000
OUTPUT CURRENT (mA)
M9999-061110-E
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