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參數(shù)資料
| 型號(hào)： | LTC3833EUDC#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | 3 X 3 MM, LEAD FREE, PLASTIC, QFN-20 |
| 文件頁數(shù)： | 15/36頁 |
| 文件大小： | 513K |
| 代理商： | LTC3833EUDC#TRPBF |
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LTC3833
22
3833f
APPLICATIONS INFORMATION
For light loading conditions, the phase and frequency
synchronization will be active if there is a clock input ap-
plied. If there is no clock input during light loading, then
theswitchingfrequencyisbasedonwhattheMODE/PLLIN
pin is tied to. When MODE/PLLIN is tied to INTVCC, the
LTC3833 will operate in forced continuous mode at the RT
programmed free-running frequency. When MODE/PLLIN
pin is tied to signal ground, the LTC3833 will operate in
pulse-skipping discontinuous conduction mode for light
loading and will switch to continuous conduction (at the
free-running frequency) for normal and heavy loads.
Minimum On-Time, Minimum Off-Time
and Dropout Operation
The minimum on-time is the smallest duration of time
in which the LTC3833 can keep the top power MOSFET’s
gate (TG) in its on state. This minimum on-time is 20ns
for the LTC3833 and is achieved when the VOUT pin is
tied to its minimum value of 0.6V while the VIN is tied to
its maximum value of 38V. For larger values of VOUT or
smaller values of VIN, the minimum on-time achievable
will be longer than 20ns. The minimum on-time will have
a dependency on the operating conditions of the switching
regulator, but is intended to be smaller for high step-down
ratio applications that will require low on-times.
The effective minimum on-time of the switching regula-
tor, however, will depend also on external components
(especially the characteristics of the power MOSFETs) as
wellasoperatingconditionsoftheswitchingregulator.The
effective on-time is defined as the time period that the SW
node stays high and this period can be different from the
time period that the top MOSFET’s gate stays high. One
of the factors that contributes to this discrepancy is the
on/off switching characteristics of the power MOSFETs. If,
for example, the power MOSFET’s turn-on delay is much
smaller than the turn-off delay, then the effective on-time
willbelongerthantheMOSFET’sgateturn-on-time,thereby
limiting the minimum on-time to a longer value than that
forced by the LTC3833.
Light loading operation in forced continuous mode will
also elongate the effective minimum on-time, as shown
in Figure 8. At light loading, the dead times between the
top MOSFET switching on/off and the bottom MOSFET
switching on/off add to the intrinsic on-time of the top
MOSFET. In forced continuous light loading, when the
inductor current flows in the reverse direction, the SW
node is pre-biased high during the dead time from the
bottom FET turning off to the top FET turning on. On the
other edge, when the top MOSFET turns off and before
the bottom MOSFET turns on, the SW node lingers high
for a longer duration of time due to a smaller magnitude
of inductor current available in light loading to pull the
SW node low.
In continuous mode operation, the minimum on-time limit
imposes a minimum duty cycle of:
DMIN = f tON(MIN)
LOSES PHASE
LOCK DUE
TO FAST
LOAD STEP
ESTABLISHES
FREQUENCY
LOCK SOON
ESTABLISHES
PHASE LOCK
AFTER ~600s
ESTABLISHES
FREQUENCY
LOCK SOON
3833 F07
PHASE LOCKED
ILOAD
CLOCK
INPUT
SW
VOUT
LOSES PHASE
LOCK DUE TO
FAST LOAD
RELEASE
Figure 7. Phase and Frequency Locking Behavior During Transient Load Conditions
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LTC3833IFE#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3833IFE#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 20TSSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3833IUDC#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 20-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3833IUDC#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 20-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無 升壓:是 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC3834EDHC-1#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR) |
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