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参数资料
| 型号： | LTC3413EFE |
| 厂商： | Linear Technology |
| 文件页数： | 9/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 16TSSOP |
| 标准包装： | 95 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 5.5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 3A |
| 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： | 16-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-TSSOP-EP |
LTC3413
APPLICATIONS INFORMATION
Δ V OUT
≤ Δ I L ? ESR +
V OUT =
V OUT =
? ? 1 + R 1 ? ?
and load step transients as well as the amount of bulk
capacitance that is necessary to ensure that the control
loop is stable. Loop stability can be checked by viewing
the load transient response as described in a later section.
The output ripple, ΔV OUT , is determined by:
? 1 ?
?
? 8 fC OUT ?
The output ripple is highest at maximum input voltage
since Δ I L increases with input voltage. Multiple capaci-
tors placed in parallel may be needed to meet the ESR
and RMS current handling requirements. Dry tantalum,
special polymer, aluminum electrolytic and ceramic capaci-
tors are all available in surface mount packages. Special
polymer capacitors offer very low ESR but have lower
capacitance density than other types. Tantalum capacitors
have the highest capacitance density but it is important
to only use types that have been surge tested for use in
switching power supplies.
Aluminum electrolytic capacitors have signi?cantly higher
ESR, but can be used in cost-sensitive applications pro-
vided that consideration is given to ripple current ratings
When choosing the input and output ceramic capacitors,
choose the X5R or X7R dielectric formulations. These
dielectrics have the best temperature and voltage charac-
teristics of all the ceramics for a given value and size.
Output Voltage Programming
In most applications, V OUT is connected directly to V FB .
The output voltage will be equal to one-half of the volt-
age on the V REF pin for this case.
V REF
2
If a different output voltage relationship is desired, an
external resistor divider from V OUT to V FB can be used.
The output voltage will then be set according to the fol-
lowing equation:
V REF ? R 2 ?
2
V OUT
R2
and long term reliability. Ceramic capacitors have excel-
lent low ESR characteristics but can have a high voltage
coef?cient and audible piezoelectric effects. The high Q
of ceramic capacitors with trace inductance can also lead
V FB
LTC3413
SGND
3413 F02
R1
to signi?cant ringing.
Figure 2. Setting the Output Voltage
Using Ceramic Input and Output Capacitors
Higher values, lower cost ceramic capacitors are now
becoming available in smaller case sizes. Their high ripple
current, high voltage rating and low ESR make them ideal
for switching regulator applications. However, care must
be taken when these capacitors are used at the input and
output. When a ceramic capacitor is used at the input and
the power is supplied by a wall adapter through long wires,
a load step at the output can induce ringing at the input,
V IN . At best, this ringing can couple to the output and be
mistaken as loop instability. At worst, a sudden inrush
of current through the long wires can potentially cause a
voltage spike at V IN large enough to damage the part.
Soft-Start
The RUN/SS pin provides a means to shut down the
LTC3413 as well as a timer for soft-start. Pulling the
RUN/SS pin below 0.5V places the LTC3413 in a low
quiescent current shutdown state (I Q < 1μA).
The LTC3413 contains an internal soft-start clamp that
gradually raises the clamp on I TH after the RUN/SS pin is
pulled above 2V. The full current range becomes available
on I TH after 1024 switching cycles. If a longer soft-start
period is desired, the clamp on I TH can be set externally
with a resistor and capacitor on the RUN/SS pin as shown
3413fc
9
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3413EFE#PBF | 功能描述:IC REG BUCK SYNC ADJ 3A 16TSSOP 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 |
| LTC3413EFE#TR | 功能描述:IC REG BUCK SYNC ADJ 3A 16TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LTC3413EFE#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 3A 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LTC3413EFEPBF | 制造商:Linear Technology 功能描述: 制造商:Linear Technology 功能描述:3A 2MHz Reg. for DDR Termination TSSOP16 |
| LTC3413EFE-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:3A, 2MHz Monolithic Synchronous Regulator for DDR/QDR Memory Termination |
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