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参数资料
| 型号： | LTC3728LIUH-1 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 3 A DUAL SWITCHING CONTROLLER, 590 kHz SWITCHING FREQ-MAX, PQCC32 |
| 封装： | 5 X 5 MM, PLASTIC, MO-220WHHD, QFN-32 |
| 文件页数： | 31/32页 |
| 文件大小： | 475K |
| 代理商： | LTC3728LIUH-1 |
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LTC3728L-1
8
3728l1fc
PIN FUNCTIONS
VOSENSE1, VOSENSE2: Error Amplier Feedback Input.
Receives the remotely-sensed feedback voltage for each
controller from an external resistive divider across the
output.
PLLFLTR: Filter Connection for Phase-Locked Loop. Alter-
natively, this pin can be driven with an AC or DC voltage
source to vary the frequency of the internal oscillator.
PLLIN: External Synchronization Input to Phase Detector.
This pin is internally terminated to SGND with 50kΩ. The
phase-locked loop will force the rising top gate signal of
controller 1 to be synchronized with the rising edge of
the PLLIN signal.
FCB: Forced Continuous Control Input. This input acts
on both controllers and is normally used to regulate a
secondary winding. Pulling this pin below 0.8V will force
continuous synchronous operation.
ITH1, ITH2: Error Amplier Output and Switching Regulator
Compensation Point. Each associated channels’ current
comparator trip point increases with this control voltage.
SGND: Small Signal Ground. Common to both controllers,
this pin must be routed separately from high current
grounds to the common (–) terminals of the COUT
capacitors.
3.3VOUT: Linear Regulator Output. Capable of supplying
10mA DC with peak currents as high as 50mA.
NC: No Connect.
SENSE2–, SENSE1–:
The (–) Input to the Differential Cur-
rent Comparators.
SENSE2+, SENSE1+:
The (+) Input to the Differential Current
Comparators. The ITH pin voltage and controlled offsets
between the SENSE– and SENSE+ pins in conjunction with
RSENSE set the current trip threshold.
RUN/SS2, RUN/SS1: Combination of soft-start and run
control inputs. A capacitor to ground at each of these pins
sets the ramp time to full output current. Forcing either of
these pins back below 1.0V causes the IC to shut down
the circuitry required for that particular controller.
TG2, TG1: High Current Gate Drives for Top N-Channel
MOSFETs. These are the outputs of oating drivers with
a voltage swing equal to INTVCC – 0.5V superimposed on
the switch node voltage SW.
SW2, SW1: Switch Node Connections to Inductors. Voltage
swing at these pins is from a Schottky diode (external)
voltage drop below ground to VIN.
BOOST2, BOOST1: Bootstrapped Supplies to the Top
Side Floating Drivers. Capacitors are connected between
the boost and switch pins and Schottky diodes are tied
between the boost and INTVCC pins. Voltage swing at the
boost pins is from INTVCC to (VIN + INTVCC).
BG2, BG1: High Current Gate Drives for Bottom (Synchro-
nous) N-Channel MOSFETs. Voltage swing at these pins
is from ground to INTVCC.
PGND: Driver Power Ground. Connects to the sources of
bottom (synchronous) N-channel MOSFETs, anodes of the
Schottky rectiers and the (–) terminal(s) of CIN.
INTVCC: Output of the Internal 5V Linear Low Dropout
Regulator and the EXTVCC Switch. The driver and control
circuits are powered from this voltage source. Must be
decoupled to power ground with a minimum of 4.7μF
tantalum or other low ESR capacitor.
EXTVCC: External Power Input to an Internal Switch Con-
nected to INTVCC. This switch closes and supplies VCC
power, bypassing the internallow dropout regulator, when-
ever EXTVCC is higher than 4.7V. See EXTVCC connection
in Applications section. Do not exceed 7V on this pin.
VIN: Main Supply Pin. A bypass capacitor should be tied
between this pin and the signal ground pin.
PGOOD: Open-Drain Logic Output. PGOOD is pulled to
ground when the voltage on either VOSENSE pin is not
within ±7.5% of its set point.
Exposed Pad (UH Package Only): Signal Ground. Must
be soldered to the PCB, providing a local ground for the
control components of the IC, and be tied to the PGND
pin under the IC.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3728LIUH-1#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3728LIUH-1#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3728LXCUH | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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 ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3728LXCUH#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 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:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
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