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| 型号： | MIC23250-S4YMT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 13/20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.
MIC23250
V OUT (V)
0.8
0.9
1
1.1
1.2
1.3
1.4
1.5
R TOP (k ? )
49
111
172
233
295
356
417
479
R BOTTOM (k ? )
442
442
442
442
442
442
442
442
CFF (pF)
120
120
120
120
120
120
120
120
There are two types of losses in switching converters; DC
losses and switching losses. DC losses are simply the
power dissipation of I 2 R. Power is dissipated in the high
side switch during the on cycle. Power loss is equal to the
high side MOSFET R DSON multiplied by the Switch Current
squared. During the off cycle, the low side N-channel
MOSFET conducts, also dissipating power. Device
operating current also reduces efficiency. The product of
the quiescent (operating) current and the supply voltage is
another DC loss. The current required driving the gates on
and off at a constant 4MHz frequency and the switching
transitions make up the switching losses.
1.6
1.7
1.8
1.9
2
2.1
2.2
540
602
663
724
786
847
909
442
442
442
442
442
442
442
120
120
120
120
120
120
120
100
80
60
40
Efficiency V OUT = 1.8V
V IN = 2.7V
V IN = 3.6V
V IN = 3.3V
0.1
2.3
2.4
2.5
970
1031
1093
442
442
442
120
120
120
20
0
11
V OUT = 1.8V
L = 1μH
0 100 1000
LOAD (mA)
2.6
2.7
2.8
2.9
3
1154
1216
1277
1338
1400
442
442
442
442
442
120
120
120
120
120
The Figure above shows an efficiency curve. From no load
to 100mA, efficiency losses are dominated by quiescent
current losses, gate drive and transition losses. By using
the HyperLight Load? mode the MIC23250 is able to
maintain high efficiency at low output currents.
Over 100mA, efficiency loss is dominated by MOSFET
Efficiency % = ? ? OUT
? ? × 100
? V IN IN
?
V OUT × I OUT
Efficiency Loss = ? 1 ? ? ?
? ? ? × 100
3.1 1461 442 120
3.2 1522 442 120
3.3 1584 442 120
Table 1. Recommended Feedback Component Values
Efficiency Considerations
Efficiency is defined as the amount of useful output power,
divided by the amount of power supplied.
? V × I OUT ?
× I
Maintaining high efficiency serves two purposes. It
reduces power dissipation in the power supply, reducing
the need for heat sinks and thermal design considerations
and it reduces consumption of current for battery powered
applications. Reduced current draw from a battery
increases the devices operating time and is critical in hand
held devices.
R DSON and inductor losses. Higher input supply voltages
will increase the Gate-to-Source threshold on the internal
MOSFETs, thereby reducing the internal R DSON . This
improves efficiency by reducing DC losses in the device.
All but the inductor losses are inherent to the device. In
which case, inductor selection becomes increasingly
critical in efficiency calculations. As the inductors are
reduced in size, the DC resistance (DCR) can become
quite significant. The DCR losses can be calculated as
follows:
DCR Loss = I OUT2 × DCR
From that, the loss in efficiency due to inductor resistance
can be calculated as follows:
? ? ? ?
? ? V OUT × I OUT + L _ P D ? ?
Efficiency loss due to DCR is minimal at light loads and
gains significance as the load is increased. Inductor
selection becomes a trade-off between efficiency and size
in this case.
June 2010
13
M9999-061110-E
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