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| 型号： | FAN4603MM13X |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC MOD BUCK PWR SUPPLY 6-MLP |
| 标准包装： | 7,000 |
| 系列： | FAN4603 |
| 类型： | 非隔离（POL） |
| 输出数： | 1 |
| 电压 - 输入（最小）： | 2.3V |
| 电压 - 输入（最大）： | 5.5V |
| Voltage - Output 1： | 1.8V |
| 电流 - 输出（最大）： | 600mA |
| 电源（瓦） - 制造商系列： | 780mW |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 6-MLP |
| 尺寸/尺寸： | 0.16" L x 0.10" W x 0.04" H（4.0mm x 2.5mm x 1.1mm） |
| 包装： | 带卷 (TR) |
| 工作温度： | -40°C ~ 85°C |
| 效率： | 91% |
| 电源（瓦特）- 最大： | 780mW |
Reducing PFM Output Ripple
PFM output ripple amplitude can be reduced by adding
external C OUT , with negligible impact on efficiency.
Reduced output ripple also results in less DC voltage
excursion at very light loads. Maximum PFM ripple occurs at
no load and is V IN and V OUT proportional.
PCB Layout Guideline
Figure 29.
Recommended PCB Layout
Figure 28. Typical 1.82V OUT No Load PFM Ripple vs. V IN
Note:
4. Ripple is less for lower V OUT levels.
The effective value of external C OUT for a desired ripple
amplitude can be determined using:
FB (pin 5) must be directly connected to VOUT (pin 4).
Figure 29 shows the recommended locations of optional C IN
and C OUT , shown as 0603 size devices.
Pad P1, shown in Figure 30 “Land Pattern,” is an optional
GND pin. Connection is not required on the PCB.
C OUT . ( μ F ) = ? ?
? ( V IN ? V OUT ) ? V OUT ? 62 ?
? ? 1
V IN ? V R
?
?
?
(3)
where V R is the desired output ripple amplitude in mV and
V IN and V OUT are in Volts.
The simplified equation above is representative of nominal
component values and does not account for device
tolerances. The bias level effects associated with case size,
voltage rating, and dielectric type of ceramic capacitors
should be considered when selecting C OUT .
Minimum Off-Time Effect on Switching
Frequency
t OFF(MIN) is 50ns, while t ON(MIN) is 35nS This imposes
constraints on the maximum/minimum OUT
V
V IN
that the
FAN4603 can provide while maintaining a fixed switching
frequency in PWM mode.
When V IN is LOW, fixed switching is maintained as long as
V OUT
V IN
≤ 1 ? t OFF ( MIN ) ? f SW ≈ 0 . 7 .
When V IN is HIGH, fixed switching is maintained as long as
V OUT
V IN
≥ t ON ( MIN ) ? f SW ≈ 0 . 2
The switching frequency drops when the regulator cannot
provide sufficient duty cycle at 6MHz to maintain regulation.
Lowering the switching frequency allows V OUT to remain in
regulation, even at very low or very high duty cycle.
? 2009 Fairchild Semiconductor Corporation
FAN4603 ? Rev. 1.0.1
10
www.fairchildsemi.com
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