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参数资料
| 型号： | LTC1735CGN-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/28页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 16-SSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 335kHz |
| 占空比： | 99.4% |
| 电源电压： | 3.5 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： | 0°C ~ 85°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
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LTC1735-1
PI FU CTIO S
C OSC (Pin 1): External capacitor C OSC from this pin to
ground sets the operating frequency.
RUN/SS (Pin 2): Combination of Soft-Start and Run
Control Inputs. A capacitor to ground at this pin sets the
ramp time to full current output. The time is approximately
1.25s/ μ F. Forcing this pin below 1.5V causes the device to
be shut down. In shutdown all functions are disabled.
Latchoff overcurrent protection is also invoked via this pin
as described in the Applications Information section.
I TH (Pin 3): Error Amplifier Compensation Point. The
current comparator threshold increases with this control
voltage. Nominal voltage range for this pin is 0V to 2.4V.
PGOOD (Pin 4): Open-Drain Logic Output and Forced
Continuous/Synchronization Input. The PGOOD pin is
pulled to ground when the voltage on the V OSENSE pin is
not within ± 7.5% of its nominal set point. If power good
indication is not needed, this pin can be tied to ground to
force continuous synchronous operation. Clocking this
pin with a signal above 1.5V P-P synchronizes the internal
oscillator to the external clock. Synchronization only
occurs while the main output is in regulation (PGOOD not
internally pulled low). When synchronized, Burst Mode
operation is disabled but cycle skipping is allowed at low
load currents. This pin requires a pull-up resistor for
power good indication. Do not connect this pin directly to
an external source (or INTV CC ). Do not exceed INTV CC on
this pin.
SENSE – (Pin 5): The (–) Input to the Current Comparator.
SENSE + (Pin 6): The (+) Input to the Current Comparator.
Built-in offsets between SENSE + and SENSE – pins in
conjunction with R SENSE set the inductor current trip
threshold.
V OSENSE (Pin 7): Receives the feedback voltage from an
external resistive divider across the output.
SGND (Pin 8): Small-Signal Ground. All small-signal
components such as C OSC , C SS , the feedback divider plus
the loop compensation resistors and capacitor(s) should
single-point tie to this pin. This pin should, in turn, connect
to PGND.
EXTV CC (Pin 9): Input to the Internal Switch Connected to
INTV CC . This switch closes and supplies V CC power when-
ever EXTV CC is higher than 4.7V. See EXTV CC connection
in Applications Information section. Do not exceed 7V on
this pin and ensure EXTV CC is ≤ V IN .
PGND (Pin 10): Driver Power Ground. This pin connects
to the source of the bottom N-channel MOSFET, the anode
of the Schottky diode and the (–) terminal of C IN .
BG (Pin 11): High Current Gate Drive for the Bottom
N-Channel MOSFET. Voltage swing at this pin is from
ground to INTV CC .
INTV CC (Pin 12): Output of the Internal 5.2V Low Dropout
Regulator and EXTV CC Switch. The driver and control
circuits are powered from this voltage. Decouple to power
ground with a 1 μ F ceramic capacitor placed directly adja-
cent to the IC together with a minimum of 4.7 μ F tantalum
or other low ESR capacitor.
V IN (Pin 13): Main Supply Pin. This pin must be closely
decoupled to power ground.
SW (Pin 14): Switch Node Connection to Inductor and
Bootstrap Capacitor. Voltage swing at this pin is from a
Schottky diode (external) voltage drop below ground to
V IN .
BOOST (Pin 15): Supply to Topside Floating Driver. The
bootstrap capacitor is returned to this pin. Voltage swing
at this pin is from a diode drop below INTV CC to V IN +
INTV CC .
TG (Pin 16): High Current Gate Drive for Top N-Channel
MOSFET. This is the output of a floating driver with a
voltage swing equal to INTV CC superimposed on the
switch node voltage SW.
7
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| LTC1735CGNPBF | 制造商:Linear Technology 功能描述:Regulator Synch Step Down LTC1735CGN |
| LTC1735CS | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC 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) |
| LTC1735CS#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC 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 |
| LTC1735CS#TR | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC 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) |
| LTC1735CS#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC 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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