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参数资料
| 型号： | LTC3613IWKH#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/36页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 15A 56QFN |
| 标准包装： | 40 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 4.5 V ~ 24 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 1MHz |
| 电流 - 输出： | 15A |
| 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： | 56-VFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 56-QFN 多焊盘（7x9） |
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LTC3613
APPLICATIONS INFORMATION
be placed close to each ITH pin. If a compensation scheme
is stable on a single phase application, a polyphase ap-
plication with N phases should be compensated as:
C ITH1 = N ? C ITH(SINGLE) , C ITH2 = N ? C ITH2(SINGLE) and
R ITH = R ITH(SINGLE) /N.
The TRACK/SS pins should be connected together so
that all LTC3613s start up with the same slew rate. The
V OSENSE+ pins of paralleled LTC3613s should be connected
together to prevent any false triggering of overvoltage and
short circuit protection. Only one divider is necessary. The
remote output and ground traces should be routed together
as differential pairs and terminated at the same remote
sensing location (preferably Kelvin connected across the
bulk capacitors at the remote output point). The smaller
value ceramic input and output capacitors, however, should
be in close proximity to the ICs.
C IN and C OUT Selection
In continuous mode, the current into PV IN is a square wave
of duty cycle V OUT /V IN . To prevent large voltage transients,
a low ESR input capacitor sized for the maximum RMS
current must be used. The maximum RMS capacitor cur-
rent is given by:
The output ripple is highest at maximum input voltage
since Δ I L increases with input voltage. Typically, once the
ESR requirement for C OUT has been met, the RMS current
rating generally far exceeds the peak-to-peak current ripple
requirement. The choice of using smaller output capaci-
tance increases the ripple voltage due to the discharging
term but can be compensated for by using capacitors of
very low ESR to maintain the ripple voltage.
Multiple capacitors placed in parallel may be needed to
meet the ESR and RMS current handling requirements.
Dry tantalum, special polymer, aluminum electrolytic and
ceramic capacitors are all available in surface mount pack-
ages. 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 significantly higher ESR, but can be used
in cost-sensitive applications provided that consideration
is given to ripple current ratings and long-term reliability.
Ceramic capacitors have excellent low ESR characteristics
but can have a high voltage coefficient and audible piezo-
electric effects. The high Q of ceramic capacitors with trace
inductance can also lead to significant ringing. When using
I RMS ? I OUT(MAX) ?
V OUT
V IN
?
V IN
V OUT
–1
ceramic input capacitors, care must be taken to ensure
that ringing from inrush currents and switching does not
pose an overvoltage hazard to the regulator.
This formula has a maximum at V IN = 2V OUT , where I RMS
= I OUT(MAX) /2. This simple worst-case condition is com-
monly used for design because even significant deviations
do not offer much relief. Note that capacitor manufactur-
ers’ ripple current ratings for electrolytic and conductive
polymer capacitors are often based on only 2000 hours of
life. This makes it advisable to further derate the capacitor
or to choose a capacitor rated at a higher temperature
than required.
The selection of C OUT is primarily determined by the effec-
tive series resistance, ESR, to minimize voltage ripple. The
output ripple, Δ V OUT , in continuous mode is determined by:
For high switching frequencies, reducing output ripple and
better EMI filtering may require small-value capacitors that
have low ESL (and correspondingly higher self resonant
frequencies) to be placed in parallel with larger value
capacitors that have higher ESL. This will ensure good
noise and EMI filtering in the entire frequency spectrum
of interest. Even though ceramic capacitors generally
have good high frequency performance, small ceramic
capacitors may still have to be parallel connected with
large ones to optimize performance.
Δ V OUT ≤ Δ I L ? R ESR +
?
?
1 ?
8 ? f ? C OUT ? ?
3613fa
18
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3614EUDD#PBF | 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN 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 |
| LTC3614EUDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN 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 |
| LTC3614IUDD#PBF | 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN 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 |
| LTC3614IUDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN 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 |
| LTC3614MPUDD#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN |
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