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参数资料
| 型号： | LTC3545IUD-1#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.8A 16QFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 3 |
| 输出电压： | 0.6 V ~ 5.5 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 |
| 电流 - 输出： | 800mA |
| 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： | 16-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-QFN-EP（3x3） |
LTC3545/LTC3545-1
OPERATION
MAIN CONTROL LOOP
The LTC3545/LTC3545-1 use a constant frequency, current
mode step-down architecture. Both the main (P-channel
MOSFET) and synchronous (N-channel MOSFET) switches
are internal. During normal operation, the internal top power
MOSFET is turned on each cycle when the oscillator sets
the RS latch, and turned off when the current comparator,
I COMP , resets the RS latch. The peak inductor current at
which I COMP resets the RS latch, is controlled by the output
of error ampli?er EA. When the load current increases, it
causes a slight decrease in the feedback voltage FB rela-
tive to the 0.6V reference, which in turn, causes the EA
ampli?er’s output voltage to increase until the average
inductor current matches the new load current. While the
top MOSFET is off, the bottom MOSFET is turned on until
either the inductor current starts to reverse, as indicated by
the current reversal comparator, I RCMP , or the beginning
of the next clock cycle.
PULSE SKIPPING/Burst Mode OPERATION
At light loads, the inductor current may reach zero or
reverse on each pulse. The bottom MOSFET is turned off
by the current reversal comparator, I RCMP , and the switch
voltage will ring. This is discontinuous mode operation,
and is normal behavior for the switching regulator.
At very light loads, the LTC3545/LTC3545-1 will automati-
cally begin operating in either pulse skipping or Burst Mode
operation depending on the state of the MODE/SYNC pin
(LTC3545). In either case the part will begin to skip cycles
in order to maintain regulation.
In pulse skip mode, the current pulses are smaller and
more frequent, giving lower output ripple. In this mode,
internal circuitry remains on and the pulses occur more
frequently resulting in lower ef?ciency than in Burst Mode
operation at light loads.
In Burst Mode operation, the part supplies fewer, larger
current pulses, resulting in higher output ripple, but much
higher light load ef?ciency than pulse skip mode. Ef?ciency
is also improved by turning off much of the internal circuitry
during the dead time between pulses.
35451fb
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3545IUD-1-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Triple 800mA Synchronous Step-Down Regulator-2.25MHz |
| LTC3545IUD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Triple 800mA Synchronous Step-Down Regulator-2.25MHz |
| LTC3545IUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Triple 800mA Synchronous Step-Down Regulator-2.25MHz |
| LTC3546 | 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 |
| LTC3546EFE#PBF | 功能描述:IC REG BUCK SYNC ADJ DL 28TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
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