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参数资料
| 型号： | LTC3811EUHF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 32/48页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 38-QFN |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 850kHz |
| 占空比： | 90% |
| 电源电压： | 4.5 V ~ 30 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： | 38-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3811
APPLICATIONS INFORMATION
node voltage, SW, rises to V IN and the BOOST pin follows.
With the topside MOSFET on, the boost voltage is above
the input supply: V BOOST = V IN + V DRVCC . The value of the
boost capacitor C B needs to be 100 times that of the total
input capacitance of the topside MOSFET(s). The reverse
breakdown of the external Schottky diode must be greater
than V IN(MAX) . When adjusting the gate drive level, the
?nal arbiter is the total input current for the regulator. If
V X (MASTER)
V OUT (SLAVE)
a change is made and the input current decreases, then
the ef?ciency has improved. If there is no change in input
current, then there is no change in ef?ciency.
Overvoltage Protection
The LTC3811 contains a comparator that monitors the
FB pin voltage for potential overvoltage conditions. This
comparator (OV in the Functional Diagram) detects when
the FB pin voltage exceeds 0.66V, or is 10% above nominal
regulation. When this condition is sensed, the top MOSFET
is turned off and the bottom MOSFET is turned on. For an
overvoltage condition that persists, the inductor current will
reverse until the negative current limit of the converter is
reached. If the OV condition terminates V OUT will return to
regulation and normal operation automatically resumes.
The OV signal that controls the top and bottom MOSFET
switching does not propagate through the PGOOD ?lter
before action is taken. The OV comparator is capable of
TIME
3811 F19a
sensing a fault condition within 100ns to 200ns, after
(19a) Coincident Tracking
V X (MASTER)
V OUT (SLAVE)
which the top MOSFET is turned off. The PGOOD ?lter
will delay the signal to the open-drain NMOS transistor
connected to the PGOOD pin, however, preventing OV (and
UV) transients of less than about 130μs from forcing a
system reset.
Phase-Locked Loop and Frequency Synchronization
The LTC3811 has a phase-locked loop (PLL) comprised of
an internal voltage-controlled oscillator (VCO) and a phase
detector. This allows the turn-on of the top MOSFET of
TIME
3811 F19b
controller 1 to be locked to the rising edge of an external
(19b) Ratiometric Tracking
Figure 19. Two different Modes of Output Votlage Tracking
V x V OUT
clock signal applied to the MODE/SYNC pin. The turn-on
phase of controller 2’s top MOSFET is controlled by the
voltage on the PHASEMODE pin. The phase detector is
an edge sensitive digital type that provides zero degrees
R B
R A
LTC3811
V FB
phase shift between the external and internal oscillators.
This type of phase detector does not exhibit false lock to
harmonics of the external clock.
R TRACKB
SS/TRACK
The output of the phase detector is a pair of comple-
mentary current sources that charge or discharge the
R TRACKA
2.5μA
3811 F20
external ?lter network connected to the PLL/LPF pin. The
relationship between the voltage on the PLL/LPF pin and
Figure 20. Using the SS/TRACK Pin for Tracking
operating frequency, when there is a clock signal applied
3811f
32
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相关代理商/技术参数 |
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| LTC3812EFE5#PBF | 制造商:Linear Technology 功能描述: |
| LTC3812EFE-5#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 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:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3812EFE-5#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP 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) |
| LTC3812IFE-5#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP 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) |
| LTC3812IFE-5#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP 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) |
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