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| 型号： | LT3663EMS8E-3.3#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 2.5 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封装： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件页数： | 16/16页 |
| 文件大小： | 188K |
| 代理商： | LT3663EMS8E-3.3#PBF |
LT3663
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3663fb
APPLICATIONS INFORMATION
Catch Diode
The catch diode conducts current only during switch-off
time. Average forward current in normal operation is
calculated from:
II
VV
V
D AVG
OUT
IN
OUT
IN
()
–
=
where IOUT is the maximum output load current pro-
grammed by the ILIM 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 VIN > 39V (typical) allowing the use of a
45V rated Schottky even when VIN 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 signicant 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).
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.
Use X5R or X7R types and keep in mind that a ceramic
capacitor biased with VOUT has less than its specied
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.
ILIM 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 ILIM pin to GND programs the output current.
Table 1 details the ILIM resistor values for specic output
current limits.
Table 1. Output Current Limit vs RLIM Value
OUTPUT CURRENT LIMIT (A)
RILIM 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:
Figure 3. Circuit for Multiple Values of Output Current Limit
LT3663
ON, RILIM = RA
OFF, RILIM = RA + RB
ILIM
3663 F03
RA
RB
相关PDF资料 |
PDF描述 |
|---|---|
| LT3663IMS8E-3.3#PBF | 2.5 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT3663IMS8E#TRPBF | 2.5 A SWITCHING REGULATOR, 1650 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT3663HMS8E-3.3#TRPBF | 2.5 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT3663HMS8E-3.3#PBF | 2.5 A SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, PDSO8 |
| LT3663IMS8E#PBF | 2.5 A SWITCHING REGULATOR, 1650 kHz SWITCHING FREQ-MAX, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3663EMS8E-5#PBF | 功能描述:IC REG BUCK 5V 1.2A 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LT3663EMS8E-5#PBF | 制造商:Linear Technology 功能描述:IC STEP-DOWN REGULATOR MSOP-8 |
| LT3663EMS8E-5#TRPBF | 功能描述:IC REG BUCK 5V 1.2A 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LT3663HMS8E#PBF | 功能描述:IC REG BUCK ADJ 1.2A 8MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 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:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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