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参数资料
| 型号： | LTC1628CUH |
| 厂商： | Linear Technology |
| 文件页数： | 8/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 32-QFN |
| 标准包装： | 73 |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 360kHz |
| 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： | 32-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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LTC1628/LTC1628-PG
PI FU CTIO S
RUN/SS1, RUN/SS2: Combination of soft-start, run con-
trol 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 + : The (+) Input to the Differential
Current Comparators. The I th pin voltage and controlled
offsets between the SENSE – and SENSE + pins in conjunc-
tion with R SENSE set the current trip threshold.
SENSE1 – , SENSE2 – : The (–) Input to the Differential
Current Comparators.
V OSENSE1 , V OSENSE2 : Receives the remotely-sensed feed-
back voltage for each controller from an external resistive
divider across the output.
FREQSET: 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: Control pin that determines which circuitry re-
mains active when the controllers are shut down and/or
provides a common control point to shut down both con-
trollers. See the Operation section for details.
FCB: Forced Continuous Control Input. This input acts on
the first controller (or both controllers depending upon
the FLTCPL pin —see pin description), and is
normally used to regulate a secondary winding. Pulling
this pin below 0.8V will force continuous synchronous
operation for the first and optionally the second control-
ler. Do not leave this pin floating.
I TH1, I TH2 : Error Amplifier 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 con-
trollers, must be routed separately from high current
3.3V OUT : Output of a linear regulator capable of supplying
10mA DC with peak currents as high as 50mA.
PGND: Driver Power Ground. Connects to the sources of
bottom (synchronous) N-channel MOSFETs, anodes of the
Schottky rectifiers and the (–) terminal(s) of C IN .
INTV CC : 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 4.7 μ F tanta-
lum or other low ESR capacitor. The INTV CC regulator
standby function is determined by the STBYMD pin.
EXTV CC : External Power Input to an Internal Switch Con-
nected 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: High Current Gate Drives for Bottom (Synchro-
nous) N-Channel MOSFETs. Voltage swing at these pins is
from ground to INTV CC .
V IN : Main Supply Pin. A bypass capacitor should be tied
between this pin and the signal ground pin.
BOOST1, BOOST2: Bootstrapped Supplies to the Top Side
Floating Drivers. Capacitors are connected between the
boost and switch pins and Schottky diodes are tied be-
tween the boost and INTV CC pins. Voltage swing at the
boost pins is from INTV CC to (V IN + INTV CC ).
SW1, SW2: Switch Node Connections to Inductors. Volt-
age swing at these pins is from a Schottky diode (external)
voltage drop below ground to V IN .
TG1, TG2: High Current Gate Drives for Top N-Channel
MOSFETs. These are the outputs of floating drivers with a
voltage swing equal to INTV CC – 0.5V superimposed on
the switch node voltage SW.
FLTCPL: (LTC1628 Only) Fault Coupling Control Pin that
determines if fault/normal conditions on one controller
will act on the other controller. FLTCPL = INTV CC to couple
channels; FLTCPL = 0V to decouple.
grounds to the common (–) terminals of the C OUT
capacitors.
1628fb
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| LTC1628CUH#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:- 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) |
| LTC1628CUH#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:- 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 |
| LTC1628CUH#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:- 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 |
| LTC1628IG | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP 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: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 |
| LTC1628IG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 28-SSOP 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 |
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