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| 型号： | LTC3613EWKH#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/36页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 15A 56-QFN |
| 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
R SENSE RESISTOR
AND
PARASITIC INDUCTANCE
For today’s highest current density solutions the value of
the sense resistor can be less than 1mΩ and the maxi-
SW
R
ESL
V OUT
mum sense voltage can be as low as 30mV. In addition,
inductor ripple currents greater than 50% with operation
LTC3613
up to 1MHz are becoming more common. Under these
SENSE +
R F
conditions, the voltage drop across the sense resistor’s
SENSE –
C F
R F
3613 F03
parasitic inductance becomes more relevant. A small RC
filter placed near the IC has been traditionally used to re-
duce the effects of capacitive and inductive noise coupled
FILTER COMPONENTS
PLACED NEAR SENSE PINS
Figure 3. R SENSE Current Sensing
R SENSE Inductor Current Sensing
A typical R SENSE inductor current sensing scheme is
shown in Figure 3. R SENSE is chosen based on the required
maximum output current. Given the maximum current,
I OUT(MAX) , maximum sense voltage, V SENSE(MAX) , set by the
V RNG pin, and maximum inductor ripple current, Δ I L(MAX) ,
the value of R SENSE can be chosen as:
in the sense traces on the PCB. A typical filter consists of
two series 10Ω resistors connected to a parallel 1000pF
capacitor, resulting in a time constant of 20ns.
The filter components need to be placed close to the IC.
The positive and negative sense traces need to be routed
as a differential pair and Kelvin (4-wire) connected to the
sense resistor.
DCR Inductor Current Sensing
For applications requiring higher efficiency at high load
currents, the LTC3613 is capable of sensing the voltage
I OUT(MAX) –
R SENSE =
V SENSE(MAX)
Δ I L(MAX)
2
drop across the inductor DCR, as shown in Figure 4. The
DCR of the inductor represents the small amount of DC
winding resistance, which can be less than 1mΩ for to-
day’s low value, high current inductors. In a high current
Conversely, given R SENSE and I OUT(MAX) , V SENSE(MAX)
and thus the V RNG voltage could be determined from the
above equation. To assure that the maximum rated output
current can be supplied for different operating conditions
application requiring such an inductor, conduction loss
through a sense resistor would cost several points of
efficiency compared to DCR sensing.
INDUCTOR
and component variations, sufficient design margin should
L
DCR
be built into these calculations.
Because of possible PCB noise in the current sensing loop,
the current ripple of Δ V SENSE = Δ I L ? R SENSE also needs
to be checked in the design to get a good signal-to-noise
ratio. In general, for a reasonably good PCB layout, a
SW
LTC3613
SENSE +
SENSE –
C1
L/DCR = (R1||R2) C1
R1
R2
(OPT)
3613 F04
V OUT
C OUT
10mV Δ V SENSE voltage is recommended as a conservative
number to start with, either for R SENSE or DCR sensing
applications.
C1 NEAR SENSE PINS
Figure 4. DCR Current Sensing
3613fa
16
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| LTC3613IWKH#PBF | 功能描述:IC REG BUCK SYNC ADJ 15A 56QFN 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 |
| LTC3613IWKH#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 15A 56QFN 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 |
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| 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 |
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