参数资料
| 型号： | MIC22602YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 12/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 6A 24MLF |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 0.7V |
| 输入电压： | 2.6 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 6A |
| 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： | 24-VFQFN 裸露焊盘，24-MLF? |
| 包装： | 标准包装 |
| 供应商设备封装： | 24-MLF?（4x4） |
| 其它名称： | 576-3645-6 |
Micrel, Inc.
MIC22602
Figure 2 shows an efficiency curve. The portion, from 0A
to 1A, efficiency losses are dominated by quiescent
current losses, gate drive and transition losses. In this
case, lower supply voltages yield greater efficiency in
that they require less current to drive the MOSFETs and
have reduced input power consumption.
Efficiency
95
90
85
80
75
70
Efficiency
vs. Inductance
L = 1μH
L = 4.7μH
0
100
95
90
85
80
75
V IN = 3.3V
V OUT = 1.8V
65
60
55
50
200 400 600 800
OUTPUT CURRENT (mA)
70
65
60
55
Figure 3. Efficiency vs. Inductance
Compensation
0
50
1
2 3 4 5
LOAD CURRENT (A)
6
The MIC22602 has a combination of internal and
external stability compensation to simplify the circuit for
small size, high efficiency designs. In such designs,
V OUT ? I OUT
( V OUT ? I OUT ) + L PD
Efficiency Loss = ? 1 ? ? ? ? × 100
(
) ideally less than 26kHz to ensure
L
Figure 2. Efficiency Curve
The region, 1A to 6A, efficiency loss is dominated by
MOSFET RDS (ON) and inductor DC losses. Higher input
supply voltages will increase the Gate-to-Source voltage
on the internal MOSFETs, reducing the internal RDS (ON) .
This improves efficiency by decreasing conduction loss
in the device but the inductor loss is inherent to the
converter. 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;
L PD = I OUT2 × DCR
From that, the loss in efficiency due to inductor
resistance can be calculated as follows:
? ?
? ? ? ?
? ? ? ?
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.
Alternatively, under lighter loads, the ripple current
becomes a significant factor. When light load efficiencies
become more critical, a larger inductor value maybe
desired. Larger inductance reduces the peak-to-peak
inductor ripple current, which minimize losses. The
voltage mode conversion is often the optimum solution.
Voltage mode is achieved by creating an internal 1MHz
ramp signal and using the output of the error amplifier to
modulate the pulse width of the switch node, thereby
maintaining output voltage regulation. With a typical gain
bandwidth of 100-200kHz, the MIC22602 is capable of
extremely fast transient responses.
The MIC22602 is designed to be stable with a typical
application using a 1μH inductor and a 100μF ceramic
(X5R) output capacitor. These values can be varied
dependant upon the tradeoff between size, cost and
efficiency, keeping the LC natural frequency
1
2 × π × L ? C
stability can be achieved. The minimum recommended
inductor value is 0.47μH and minimum recommended
output capacitor value is 22μF. With a larger inductor,
there is a reduced peak-to-peak current which yields a
greater efficiency at lighter loads. A larger output
capacitor will improve transient response by providing a
larger hold up reservoir of energy to the output.
The integration of one pole-zero pair within the control
loop greatly simplifies compensation. The optimum
values for C COMP (in series with a 20k resistor) are shown
below.
C 22-47μF 47μF- 100μF-
100μF 470μF
0 -15pF
following graph in Figure 3 illustrates the effects of
inductance value at light load.
0.47μH
1μH
2.2μH
0*-10pF
?
15-33pF
22pF
15-22pF
33-47pF
33pF
33pF
100-220pF
* VOUT > 1.2V, VOUT > 1V
?
October 2009
12
M9999-102809-A
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