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参数资料
| 型号： | LTC3707IGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-SSOP |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 360kHz |
| 占空比： | 99.4% |
| 电源电压： | 4.5 V ~ 28 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： | 28-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
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LTC3707
PIN FUNCTIONS
RUN/SS1, RUN/SS2 (Pins 1, 15): Combination of soft-start,
run control inputs and short-circuit detection timers. 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. Latchoff overcurrent
protection is also invoked via this pin as described in the
Applications Information section.
SENSE1 + , SENSE2 + (Pins 2, 14): The (+) Input to the
Differential Current Comparators. The I TH pin voltage and
controlled offsets between the SENSE – and SENSE + pins in
conjunction with R SENSE set the current trip threshold.
SENSE1 – , SENSE2 – (Pins 3, 13): The (–) Input to the
Differential Current Comparators.
V OSENSE1 , V OSENSE2 (Pins 4, 12): Receives the remotely-
sensed feedback voltage for each controller from an external
resistive divider across the output.
FREQSET (Pin 5): Frequency Control Input to the Oscillator.
This pin can be left open, tied to ground, tied to INTV CC
or driven by an external voltage source. This pin can also
be used with an external phase detector to build a true
phase-locked loop.
STBYMD (Pin 6): Control pin that determines which cir-
cuitry remains active when the controllers are shut down
and/or provides a common control point to shut down both
controllers. See the Operation section for details.
FCB (Pin 7): 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 on both controllers.
Do not leave this pin ?oating.
I TH1, I TH2 (Pins 8, 11): Error Ampli?er Output and Switching
Regulator Compensation Point. Each associated channels’
current comparator trip point increases with this control
voltage.
SGND (Pin 9): Small Signal Ground common to both
controllers, must be routed separately from high current
grounds to the common (–) terminals of the C OUT
capacitors.
3.3V OUT (Pin 10): Output of a linear regulator capable
of supplying 10mA DC with peak currents as high as
50mA.
PGND (Pin 20): Driver Power Ground. Connects to the
sources of bottom (synchronous) N-channel MOSFETs,
anodes of the Schottky recti?ers and the (–) terminal(s)
of C IN .
INTV CC (Pin 21): Output of the Internal 5V Linear Low
Dropout Regulator and the EXTV CC 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. The INTV CC regulator
standby function is determined by the STBYMD pin.
EXTV CC (Pin 22): External Power Input to an Internal Switch
Connected to INTV CC . This switch closes and supplies V CC
power, bypassing the internal low dropout regulator, when-
ever EXTV CC is higher than 4.7V. See EXTV CC connection
in Applications section. Do not exceed 7V on this pin.
BG1, BG2 (Pins 23, 19): High Current Gate Drives for Bot-
tom (Synchronous) N-Channel MOSFETs. Voltage swing
at these pins is from ground to INTV CC .
V IN (Pin 24): Main Supply Pin. A bypass capacitor should
be tied between this pin and the signal ground pin.
BOOST1, BOOST2 (Pins 25, 18): 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 INTV CC pins. Voltage swing at
the boost pins is from INTV CC to (V IN + INTV CC ).
SW1, SW2 (Pins 26, 17): Switch Node Connections to
Inductors. Voltage swing at these pins is from a Schottky
diode (external) voltage drop below ground to V IN .
TG1, TG2 (Pins 27, 16): High Current Gate Drives for
Top N-Channel MOSFETs. These are the outputs of ?oat-
ing drivers with a voltage swing equal to INTV CC – 0.5V
superimposed on the switch node voltage SW.
PGOOD (Pin 28): Open-Drain Logic Output. PGOOD is
pulled to ground when the voltage on either V OSENSE pin
is not within ± 7.5% of its set point.
3707fb
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相关代理商/技术参数 |
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| LTC3708EUH | 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 |
| LTC3708EUH#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® 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 |
| LTC3708EUH#TR | 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 |
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| LTC3708EUHPBF | 制造商:Linear Technology 功能描述:LTC3708 dual SD tracking PS controller |
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