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| 型号： | LT3663EMS8E-5#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK 5V 1.2A 8MSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 5V |
| 输入电压： | 7.5 V ~ 36 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 1.2A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 8-MSOP-EP |
| 产品目录页面： | 1332 (CN2011-ZH PDF) |
LT3663
APPLICATIONS INFORMATION
I D ( AVG ) = I OUT
Catch Diode
The catch diode conducts current only during switch-off
time. Average forward current in normal operation is
calculated from:
V IN – V OUT
V IN
where I OUT is the maximum output load current pro-
grammed by the I LIM resistor. Peak reverse voltage is equal
to the regulator input voltage. Use a Schottky diode with a
reverse voltage rating greater than the input voltage. The
overvoltage protection feature in the LT3663 keeps the
switch off when V IN > 39V (typical) allowing the use of a
45V rated Schottky even when V IN ranges up to 60V.
Input Capacitor
Bypass the input of the LT3663 circuit with a 1μF or higher
value ceramic capacitor of X7R or X5R type. Y5V types
have poor performance over temperature and applied volt-
age and are not recommended. If the input power source
has high impedance, or there is significant inductance
due to long wires or cables, additional bulk capacitance
may be necessary. This can be provided with a low per-
formance electrolytic capacitor. Step-down regulators
draw current from the input supply in pulses with very
fast rise and fall times. The input capacitor is required
to reduce the resulting voltage ripple at the LT3663 and
to force this very high frequency switching current into
a tight local loop, minimizing EMI. Place the capacitor in
close proximity to the LT3663 and the catch diode; (see
the PCB Layout section).
Use X5R or X7R types and keep in mind that a ceramic
capacitor biased with V OUT has less than its specified
nominal capacitance.
High performance electrolytic capacitors can be used for
the output capacitor. Low ESR is important, so choose
one that is intended for use in switching regulators. Keep
the ESR less than 0.1Ω.
I LIM Resistor
The LT3663 output current limit controls the maximum
current delivered from the LT3663 regulator. This allows
tighter control of the system power dissipation and also
protects the inductor and diode from overheating during
an overload or short circuit condition. A resistor con-
nected from I LIM pin to GND programs the output current.
Table 1 details the I LIM resistor values for specific output
current limits.
Table 1. Output Current Limit vs R LIM Value
OUTPUT CURRENT LIMIT (A) R ILIM VALUE (kΩ)
0.4 140
0.6 75
0.8 48.7
1.0 36.5
1.2 28.7
There may be a reason in some applications to move the
output current limit. The following simple circuit demon-
strates how the output current limit can be adjusted:
Output Capacitor
A 10μF or greater ceramic capacitor is recommended to
provide low output ripple and good transient response.
Ceramic capacitors have very low equivalent series re-
sistance (ESR) and provide the best ripple performance.
ON, R ILIM = RA
OFF, R ILIM = RA + RB
RA
RB
I LIM
LT3663
3663 F03
Figure 3. Circuit for Multiple Values of Output Current Limit
9
For more information For more information www.linear.com/LT3663
3663fc
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