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| 型号： | ISL8009AEVAL1Z |
| 厂商： | Intersil |
| 文件页数： | 12/13页 |
| 文件大小： | 0K |
| 描述： | EVALUATION BOARD FOR ISL8009A |
| 产品培训模块： | Solutions for Industrial Control Applications |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，非隔离 |
| 输出电压： | 1.8V |
| 电流 - 输出： | 1.5A |
| 输入电压： | 2.7 ~ 5.5 V |
| 稳压器拓扑结构： | 降压 |
| 频率 - 开关： | 1.6MHz |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ISL8009A |
ISL8009A
V O ? ? 1 – -------- ?
V IN ?
?
L ? f S
? R 2 ?
V O = 0.8 ? ? 1 + ------- ?
Applications Information
Output Inductor and Capacitor Selection
To consider steady state and transient operation, ISL8009A
typically uses a 3.3μH output inductor. Higher or lower inductor
values can be used to optimize the total converter system
performance. For example, for higher output voltage 3.3V
application, in order to decrease the inductor current ripple and
output voltage ripple, the output inductor value can be increased.
The inductor ripple current can be expressed in Equation 1:
? V O ?
(EQ. 1)
Δ I = ------------------------------------
The inductor’s saturation current rating needs be at least larger
than the peak current. The ISL8009A protects the typical peak
current 2.1A. The saturation current needs to be over 2.4A for
maximum output current application.
ISL8009A uses internal compensation network and the output
capacitor value is dependant on the output voltage. The ceramic
capacitor is recommended to be X5R or X7R. The recommended
minimum output capacitor values are shown in Table 1.
TABLE 1. OUTPUT CAPACITOR VALUE vs V OUT
Input Capacitor Selection
The main functions for the input capacitor are to provide
decoupling of the parasitic inductance and to provide filtering
function to prevent the switching current from flowing back to the
battery rail. A 10μF, X5R or X7R ceramic capacitor is a good
starting point for the input capacitor selection.
Output Voltage Setting Resistor Selection
The resistors R 2 and R 3 shown in Figure 24 set the output
voltage for the adjustable version. The output voltage can be
calculated by Equation 2:
(EQ. 2)
? R 3 ?
where the 0.8V is the reference voltage.
The voltage divider consists of R 2 and R 3 and increases the
quiescent current by VO/(R 2 + R 3 ), so larger resistance is
desirable. On the other hand, the VFB pin has leakage current
that will cause error in the output voltage setting. The leakage
current has a typical value of 0.1μA. To minimize the accuracy
impact on the output voltage, select the R 3 no larger than
200k Ω . For V O = 0.8V, it is recommended to short R 2 and open
R 3 .
V OUT (V)
0.8
1.2
1.6
1.8
2.5
3.3
3.6
C OUT (μF)
10
10
10
10
10
10
10
L (μH)
1.0~2.2
1.2~2.2
1.8~2.2
1.8~3.3
1.8~3.3
1.8~4.7
1.8~4.7
Layout Recommendation
The layout is a very important converter design step to make sure
the designed converter works well. For the ISL8009A buck
converter, the power loop is composed of the output inductor L,
the output capacitor C OUT , the LX pin and the GND pin. It is
necessary to make the power loop as small as possible.
The heat of the IC is mainly dissipated through the thermal pad.
Maximizing the copper area connected to the thermal pad is
preferable. In addition, a solid ground plane is helpful for EMI
performance. It is recommended to add 5 vias under the thermal
pad connection to the solid ground plane.
In Table 1, the minimum output capacitor value is given for
different output voltages to make sure the whole converter
system is stable. Maximum output capacitance should be limited
to 50μF or less.
Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted
in the quality certifications found at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time
without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be
accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
12
FN6656.3
February 28, 2013
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