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参数资料
| 型号： | LTC3546IFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/30页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 28TSSOP |
| 标准包装： | 2,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz，750kHz ~ 4MHz |
| 电流 - 输出： | 1A，2A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 28-SOIC（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 28-TSSOP 裸露焊盘 |
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LTC3546
OPERATION
The output capacitor and the inductor supply the power
to the load until I TH exceeds 0.31V, turning on the switch
and the main control loop which starts another cycle.
The Burst Mode peak inductor current can be set externally
via the BMC pin. When this pin is set somewhere between
0V to 0.6V, the voltage on this pin controls the Burst Mode
clamp level. When the BMC pin is pulled to V IN , an internal
Burst Mode clamp level is used.
For lower output voltage ripple at low currents, pulse-
skipping mode can be used. In this mode, the LTC3546
continues to switch at constant frequency down to very low
currents, where it will eventually begin skipping pulses.
Finally, in forced continuous mode, the inductor current
is constantly cycled which creates a fixed output voltage
ripple at all output current levels. This feature is desirable in
telecommunications since the noise is a constant frequency
and is thus easy to filter out. Another advantage of this mode
is that the regulator is capable of both sourcing current into
a load and sinking some current from the output. In forced
continuous operation, an overvoltage comparator monitors
the V FB pin and decreases the current limit whenever an
overvoltage condition is detected (V FB > 0.63V).
The SYNC/MODE pin selects what mode the LTC3546 is in.
The SYNC/MODE pin sets the mode for both regulators.
Dropout Operation
When the input supply voltage decreases toward the
output voltage, the duty cycle increases to 100% which
is the dropout condition. In the dropout condition, the
PMOS switch is turned on continuously with the output
voltage being equal to the input voltage minus the volt-
age drops across the internal P-channel MOSFETs and
inductors.
Low Supply Operation
The LTC3546 incorporates an undervoltage lockout circuit
which shuts down the part when the input voltage drops
below about 2.14V to prevent unstable operation.
13
For more information www.linear.com/3546
3546fc
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3546IUFD#PBF | 功能描述:IC REG BUCK SYNC ADJ 1A/2A 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
| LTC3546IUFD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 1A/2A 28QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LTC3546IUFDPBF | 制造商:Linear Technology 功能描述:Conv DC-DC Dual Step-Down 5.5V QFN28EP |
| LTC3546IUFDTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, 3A/1A or 2A/2A Confi gurable Step-Down DC/DC Regulator |
| LTC3547 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Monolithic 300mA Synchronous Step-Down Regulator |
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