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参数资料
| 型号： | LTC3809EDD-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 10-DFN |
| 标准包装： | 121 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 600kHz |
| 占空比： | 100% |
| 电源电压： | 2.75 V ~ 9.8 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： | 10-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 产品目录页面： | 1336 (CN2011-ZH PDF) |
LTC3809-1
PIN FUNCTIONS
MODE (Pin 1): This pin performs two functions: 1) auxiliary
winding feedback input, and 2) Burst Mode operation,
pulse skipping or forced continuous mode select.
To select Burst Mode operation at light loads, tie this
pin to V IN . Grounding this pin selects forced continuous
operation which allows the inductor current to reverse.
Tying this pin to V FB selects pulse-skipping mode. Do not
leave this pin ?oating.
TRACK/SS (Pin 2): Tracking Input for the Controller or
Optional External Soft-Start Input. This pin allows the
start-up of V OUT to “track” the external voltage at this pin
using an external resistor divider. Tying this pin to V IN
allows V OUT to start up with the internal 0.74ms soft-start.
An external soft-start can be programmed by connecting
a capacitor between this pin and ground. Do not leave
this pin ?oating.
V FB (Pin 3): Feedback Pin. This pin receives the remotely
sensed feedback voltage for the controller from an external
resistor divider across the output.
I TH (Pin 4): Current Threshold and Error Ampli?er
Compensation Point. Nominal operating range on this pin
is from 0.7V to 2V. The voltage on this pin determines the
threshold of the main current comparator.
RUN (Pin 5): Run Control Input. Forcing this pin below
1.1V shuts down the chip. Driving this pin to V IN or
IPRG (Pin 6): Three-State Pin to Select Maximum Peak
Sense Voltage Threshold. This pin selects the maximum
allowed voltage drop between the V IN and SW pins
(i.e., the maximum allowed drop across the external
P-channel MOSFET). Tie to V IN , GND or ?oat to select
204mV, 85mV or 125mV respectively.
BG (Pin 7): Bottom (NMOS) Gate Drive Output. This pin
drives the gate of the external N-channel MOSFET. This
pin has an output swing from PGND to V IN .
TG (Pin 8): Top (PMOS) Gate Drive Output. This pin drives
the gate of the external P-channel MOSFET. This pin has
an output swing from PGND to V IN .
V IN (Pin 9): Chip Signal Power Supply. This pin powers
the entire chip, the gate drivers and serves as the positive
input to the differential current comparator.
SW (Pin 10): Switch Node Connection to Inductor. This
pin is also the negative input to the differential current
comparator and an input to the reverse current comparator.
Normally this pin is connected to the drain of the external
P-channel MOSFET, the drain of the external N-channel
MOSFET and the inductor.
GND (Exposed Pad, Pin 11): Ground connection for
internal circuits, the gate drivers and the negative input to
the reverse current comparator. The Exposed Pad must
be soldered to the PCB ground.
releasing this pin enables the chip to start-up with the
internal soft-start.
38091fc
7
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3809EMSE | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP 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) |
| LTC3809EMSE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP 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) |
| LTC3809EMSE#TR | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP 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) |
| LTC3809EMSE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP 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) |
| LTC3809EMSE-1 | 功能描述:IC REG CTRLR BUCK PWM CM 10-MSOP 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) |
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