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参数资料
| 型号： | ISL8022IRZ |
| 厂商： | Intersil |
| 文件页数： | 16/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 12DFN |
| 标准包装： | 75 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 2.8 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 2A，1.7A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-VFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 12-DFN（4x3） |
ISL8022
Thermal Shutdown
Let R 3 = 100k Ω , then R 2 will be as shown in Equation 2:
R 2 = R 3 ? ------------- – 1 ?
The ISL8022 has built-in thermal protection. When the internal
temperature reaches +150°C, the regulator is completely shut
down. As the temperature drops to +130°C, the ISL8022
? V OUT ?
? V FB ?
(EQ. 2)
V O ? ? 1 – -------- ?
? V IN ?
Δ I = ------------------------------------
resumes operation by stepping through a soft start-up.
Applications Information
Output Inductor and Capacitor Selection
To consider steady state and transient operation, ISL8022
typically uses a 1.2μH output inductor. Higher or lower inductor
value 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 as in Equation 1:
? V O ?
(EQ. 1)
L ? f S
The inductor’s saturation current rating needs to be at least
larger than the peak current. The ISL8022 protects the typical
peak current 3.2A/2.8A. The saturation current needs to be over
3.6A for maximum output current application.
ISL8022 uses internal compensation network and the output capacitor
value is dependent on the output voltage. The ceramic capacitor is
recommended to be X5R or X7R. The recommended minimum output
Output Voltage Selection
The output voltage of the regulator can be programmed via an external
resistor divider that is used to scale the output voltage relative to the
internal reference voltage and feed it back to the inverting input of the
error amplifier. Refer to “Typical Applications” on page 2 Figure 2.
The output voltage programming resistor, R 2 (or R 5 in Channel
2), will depend on the desired output voltage of the regulator. The
value for the feedback resistor is typically between 0 Ω and
750k Ω .
16
If the output voltage desired is 0.6V, then R 3 is left unpopulated
and short R 2 . For better performance, add 10pF in parallel to R 2 .
Input Capacitor Selection
The main functions for the input capacitor is to provide
decoupling of the parasitic inductance and to provide filtering
function to prevent the switching current flowing back to the
battery rail. One 10μF X5R or X7R ceramic capacitor is a good
starting point for the input capacitor selection per channel. An
optional input inductor can be used before the ceramic capacitor
to limit switching noise. It is recommended to limit the
inductance less than 0.15μH.
PCB Layout Recommendation
The PCB layout is a very important converter design step to make
sure the designed converter works well. Refer to ISL8022 design
procedure for suggestions. For ISL8022, the power loop is
composed of the output inductor L’s, the output capacitor C OUT1
and C OUT2 , the LX’s pins, and the GND pin. It is necessary to
make the power loop as small as possible and the connecting
traces among them should be direct, short and wide. The
switching node of the converter, the LX_ pins, and the traces
connected to the node are very noisy, so keep the voltage
feedback trace away from these noisy traces. The input capacitor
should be placed to VIN pin as close as possible and the ground
of input and output capacitors should be connected as close 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 better EMI performance. It is recommended to add at
least 5 vias ground connection within the pad for the best
thermal relief.
FN7650.3
March 14, 2013
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