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参数资料
| 型号： | LTC3852EUDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR DOUBLER PWM 24-QFN |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 810kHz |
| 占空比： | 99% |
| 电源电压： | 2.7 V ~ 38 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 是 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3852
PIN FUNCTIONS
C – (Pin 8): Flying Capacitor Negative Terminal.
SHDN (Pin 10): Active Low Shutdown Input. A low on
SHDN disables the charge pump. This pin must not be
allowed to ?oat.
GND1 (Pin 11): Charge Pump Ground. The (–) terminals of
C IN and C VPUMP should be closely connected to this pin.
V IN1 (Pin 12): Input Supply Voltage to Charge Pump. V IN1
should be bypassed with a 1μF to 4.7μF low ESR ceramic
capacitor.
V PUMP (Pin 13): Regulated Output Voltage from Charge
Pump. For best performance, V PUMP should be bypassed
with a low ESR ceramic capacitor providing at least 2.2μF
of capacitance as close to the pin as possible.
INTV CC (Pin 14): Gate Drive Supply. The MOSFET drivers
and internal logic are powered from this voltage. Bypass
this pin to GND with a minimum 2.2μF low ESR tantalum
or ceramic capacitor, C INTVCC .
V IN2 (Pin 15): Main Supply Pin for Step-Down Controller.
A bypass capacitor should be tied between this pin and
the GND2 pin.
BOOST (Pin 16): Boosted Floating Driver Supply. The
(+) terminal of the booststrap capacitor is connected to
this pin. This pin swings from a diode voltage drop below
INTV CC up to V IN1 + INTV CC .
TG (Pin 17): Top Gate Driver Output. This is the output
of a ?oating driver with a voltage swing equal to INTV CC
superimposed on the switch node voltage.
SW (Pin 18): Switch Node Connection to the Inductor. Vol-
MODE/PLLIN (Pin 19): Forced Continuous Mode, Burst
Mode operation or Pulse-Skipping Mode Selection Pin
and External Synchronization Input to Phase Detector
Pin. Connect this pin to INTV CC to force continuous
conduction mode of operation. Connect to GND2 to enable
pulse-skipping mode of operation. To select Burst Mode
operation, tie this pin to INTV CC through a resistor no less
than 50k, but no greater than 250k. A clock on the pin
will force the controller into forced continuous mode of
operation and synchronize the internal oscillator.
FREQ/PLLFLTR (Pin 20): The phase-locked loop’s lowpass
?lter is tied to this pin. Alternatively, a resistor can be
connected between this pin and GND2 to vary the frequency
of the internal oscillator.
RUN (Pin 21): Run Control Input. Forcing the pin below
1.25V shuts down the step-down controller. There is a
2μA pull-up current on this pin.
TRACK/SS (Pin 22): Output Voltage Tracking and Soft-Start
Input. A capacitor to ground at this pin sets the ramp rate
for the output voltage. An internal soft-start current of 1μA
charges this capacitor.
I TH (Pin 23): Error Ampli?er Output and Switching
Regulator Compensation Point. The current comparator
input threshold increases with this control voltage.
V FB (Pin 24): Error Ampli?er Feedback Input. This pin
receives the remotely sensed feedback voltage from an
external resistive divider across the output.
GND (Exposed Pad Pin 25): Ground. Must be soldered to
PCB, providing a local ground for the IC.
tage swing at this pin is from a diode (external) voltage drop
below ground to the buck regulator power stage V IN .
3852f
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3852IUDD#PBF | 功能描述:IC REG CTRLR DOUBLER PWM 24-QFN 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) |
| LTC3852IUDD#TRPBF | 功能描述:IC REG CTRLR DOUBLER PWM 24-QFN 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) |
| LTC3853EUJ#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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 |
| LTC3853EUJ#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 40-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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 |
| LTC3853EUJPBF | 制造商:Linear Technology 功能描述:DC-DC Controller Triple Buck 24V QFN40 |
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