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参数资料
| 型号： | LTC3713EG |
| 厂商： | Linear Technology |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 24-SSOP |
| 标准包装： | 59 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1.5MHz |
| 占空比： | 90% |
| 电源电压： | 1.5 V ~ 36 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 24-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
LTC3713
OPERATIO
switch cycle, turning on the switch. When the summation
of a signal representing switch current and a ramp gen-
erator (introduced to avoid subharmonic oscillations at
duty factors greater than 50%) exceeds the V C signal,
comparator A2 changes state, resetting the flip-flop and
turning off the switch. More power is delivered to the
output as switch current is increased. The output voltage,
attenuated by external resistor divider R7 and R8, appears
at the V FB2 pin, closing the overall loop. Frequency com-
pensation is provided internally by R C and C C . Transient
APPLICATIO S I FOR ATIO
A typical LTC3713 application circuit is shown in
Figure 1. External component selection is primarily de-
termined by the maximum load current and begins with
the selection of the sense resistance and power MOSFET
switches. The LTC3713 uses the on-resistance of the
synchronous power MOSFET for determining the induc-
tor current. The desired amount of ripple current and
operating frequency largely determines the inductor value.
Finally, C IN is selected for its ability to handle the large
RMS current into the converter and C OUT is chosen with
low enough ESR to meet the output voltage ripple and
transient specification.
Maximum Sense Voltage and V RNG Pin
Inductor current is determined by measuring the voltage
across a sense resistance that appears between the
SENSE + and SENSE – pins. The maximum sense voltage
is set by the voltage applied to the V RNG pin and is equal
to approximately (0.133)V RNG . The current mode control
loop will not allow the inductor current valleys to exceed
(0.133)V RNG /R SENSE . In practice, one should allow some
margin for variations in the LTC3713 and external com-
ponent values and a good guide for selecting the sense
resistance is:
response can be optimized by the addition of a phase lead
capacitor C PL in parallel with R7 in applications where
large value or low ESR output capacitors are used.
As the load current is decreased, the switch turns on for
a shorter period each cycle. If the load current is further
decreased, the boost converter will skip cycles to main-
tain output voltage regulation. If the V FB2 pin voltage is
increased significantly above 1.23V, the boost converter
will enter a low power state.
resulting in nominal sense voltages of 50mV to 200mV.
Additionally, the V RNG pin can be tied to SGND or INTV CC
in which case the nominal sense voltage defaults to 70mV
or 140mV, respectively. The maximum allowed sense
voltage is about 1.33 times this nominal value.
Connecting the SENSE + and SENSE – Pins
The LTC3713 can be used with or without a sense resistor.
When using a sense resistor, it is placed between the
source of the bottom MOSFET M2 and ground. Connect
the SENSE + and SENSE – pins as a Kelvin connection to the
sense resistor with SENSE + at the source of the bottom
MOSFET and the SENSE – pin to PGND1. Using a sense
resistor provides a well defined current limit, but adds cost
and reduces efficiency. Alternatively, one can eliminate the
sense resistor and use the bottom MOSFET as the current
sense element by simply connecting the SENSE + pin to the
drain and the SENSE – pin to the source of the bottom
MOSFET. This improves efficiency, but one must carefully
choose the MOSFET on-resistance as discussed in a later
section.
Applications Requiring Symmetric Current Limit
The I TH voltage has a range of 0V to 2.4V with 0.8V
R SENSE =
V RNG
10 ? I OUT ( MAX )
corresponding to 0A. In applications in which the output
will only be sourcing current, this allows the output to sink
An external resistive divider from INTV CC can be used to
set the voltage of the V RNG pin between 0.5V and 2V
one third of the maximum source current. For applications
in which the output will be sourcing and sinking current,
it might be desirable to have a symmetrical output current
3713fa
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相关代理商/技术参数 |
参数描述 |
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| LTC3713EG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3713EG#TR | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3713EG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3714EG | 功能描述:IC STP-DWN CNTRLR W/OPAMP 28SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LTC3714EG#PBF | 功能描述:IC STP-DWN CNTRLR W/OPAMP 28SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
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