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参数资料
| 型号： | LTC3811EUHF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/48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
PIN FUNCTIONS
BG1, BG2: High Current Gate Driver Outputs for the
N-Channel Lower Power MOSFETs.
BOOST1, BOOST2: Bootstrapped Supply Inputs to the
Topside Floating Drivers. A low ESR (X5R or better) ceramic
bypass capacitor should be connected between the BOOST
pin and the SW pin as close as possible to the IC.
CLKOUT: A Digital Output Used for Daisy-Chaining Multiple
LTC3811 ICs in Multiphase Systems. The PHASEMODE
pin voltage controls the phase relationship between the
channel 1 TG signal and CLKOUT.
COMP1, COMP2: Error Ampli?er Output Voltages. The
error ampli?ers in the LTC3811 are high bandwidth, low
offset true operational ampli?ers that have low output
impedance. As a result, the outputs of two active error
ampli?ers cannot be directly connected together! For
multiphase operation, connecting the FB pin of a slave
error ampli?er to INTV CC will disable the output of that
ampli?er. Multiphase operation can then be achieved by
connecting all of the COMP pins together and using one
channel as the master and all of the others as slaves. The
FB and COMP pins are also used for compensating the
control loop of the converter.
CSOUT (QFN Only): Output of the Voltage Positioning
g m Ampli?er. This pin allows the user to program the
amount of voltage droop in the output voltage at high
load current. The output of the voltage positioning g m
ampli?er is a bi-directional current proportional to the
(SENSE + – SENSE – ) voltages for both channels. The
g m is internally ?xed to 5mS. Forcing the g m ampli?er
output current through a low value external resistor will
program the amount of voltage droop seen at the output.
See Applications Information for more details regarding
voltage positioning.
DIFF/IN + : Remote Sense Differential Ampli?er Positive
Input. A low offset, high bandwidth operational ampli?er
is con?gured with four precision 80k resistors for a non-
inverting gain of one. This pin is normally connected to the
positive terminal of the decoupling capacitor at the load.
DIFF/IN – : Remote Sense Differential Ampli?er Negative
Input. This pin is normally connected to the negative
terminal of the decoupling capacitor at the remote load.
The DIFF/IN + and DIFF/IN – PCB traces should be routed
as close as possible and parallel to each other from the
IC to the output capacitor.
DIFF/OUT: Remote Sense Differential Ampli?er Output
Voltage, Con?gured for a Noninverting Gain of One. The
voltage at the DIFF/OUT pin is normally connected through
an external resistor divider to the FB pin of one channel.
The bottom of the divider should be connected to the
SGND pin of the IC.
DRV CC : Output of the Internal 6V Low Dropout Regulator
(LDO), Supply Pin for the Bottom Gate Drivers and Output
of the PMOS EXTV CC Switch. A low ESR (X5R or better)
4.7μF ceramic bypass capacitor should be connected
between the DRV CC pin and the PGND pin, as close as
possible to the IC.
Exposed Pad (QFN Only): The Exposed Pad of the QFN
Leadframe is PGND.
EXTV CC : External Power Supply Input to an Internal PMOS
Power Switch Connected Between EXTV CC (Drain) and
DRV CC (Source). This pin allows an external supply to be
used for the high current gate drivers, thereby reducing
power dissipation in the LDO and increasing ef?ciency.
When EXTV CC exceeds 4.5V (rising), the high current
PMOS switch turns on and shorts EXTV CC to DRV CC ,
bypassing the internal LDO. See Applications Information
for more details.
3811f
11
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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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