- 您現在的位置：買賣IC網 > Datasheet目錄46 > SC424MLTRT (Semtech)IC REG DL BUCK/LINEAR 28MLPQ Datasheet資料下載
參數資料
| 型號： | SC424MLTRT |
| 廠商： | Semtech |
| 文件頁數： | 16/29頁 |
| 文件大小： | 496K |
| 描述： | IC REG DL BUCK/LINEAR 28MLPQ |
| 標準包裝： | 1 |
| 系列： | SmartDrive™ |
| 拓撲： | 降壓（降壓）（1），線性（LDO）（1） |
| 功能： | 任何功能 |
| 輸出數： | 2 |
| 頻率 - 開關： | 200kHz ~ 1MHz |
| 電壓/電流 - 輸出 1： | 可調至 0.75V，6A |
| 電壓/電流 - 輸出 2： | 5V，150mA |
| 帶 LED 驅動器： | 無 |
| 帶監控器： | 無 |
| 帶序列發生器： | 無 |
| 電源電壓： | 3 V ~ 28 V |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-VFQFN 裸露焊盤 |
| 供應商設備封裝： | 28-MLPQ（4x4） |
| 包裝： | 標準包裝 |
| 其它名稱： | SC424MLDKR |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁當前第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁
SC414/SC424
16
is recommended to force 33% of the V5V voltage on the
EN/PSV pin to operate in forced continuous mode.
When EN/PSV is high (above 45% of the voltage at V5V)
for SC414, the switching regulator turns on with ultrasonic
power-save enabled. The SC414 ultrasonic power-save
operation maintains a minimum switching frequency of
25kHz, for applications with stringent audio
requirements.
When EN/PSV is high (above 45% of the voltage at V5V)
for SC424, the switching regulator turns on with power-
save enabled. The SC424 power-save operation is designed
to maximize effi ciency at light loads with no minimum
frequency limits. This makes the SC424 an excellent choice
for portable and battery-operated systems.
The ENL input is used to control the internal LDO. This
input provides a second function by acting as a V
IN
ULVO
sensor for the switching regulator. When ENL is low
(grounded), the LDO is off . When ENL is a logic high but
below the V
IN
UVLO threshold (2.6V typical), then the LDO
is on and the switcher is off . When ENL is above the V
IN
UVLO threshold, the LDO is enabled and the switcher is
also enabled if the EN/PSV pin is not grounded.
Forced Continuous Mode Operation
The SC414/SC424 operates the switcher in Forced
Continuous Mode (FCM) by fl oating the EN/PSV pin (see
Figure 4). In this mode of operation, the MOSFETs are
turned on alternately to each other with a short dead time
between them to avoid cross conduction. This feature
results in uniform frequency across the full load range
with the trade-off being poor effi ciency at light loads due
to the high-frequency switching of the MOSFETs.
For V5V < 4.5V, it is recommended to force 33% of the V5V
voltage on the EN/PSV pin to operate in forced continuous
mode.
FB Ripple
Voltage (V
FB
)
FB threshold
DL
DH
Inductor
Current
DC Load Current
DH on-time is triggered when
V
FB
reaches the FB Threshold.
(750mV)
On-time
(T
ON
)
DL drives high when on-time is completed.
DL remains high until V
FB
falls to the FB threshold.
Figure 4 Forced Continuous Mode Operation
Ultrasonic Power-save Operation (SC414)
The SC414 provides ultrasonic power-save operation at
light loads, with the minimum operating frequency fi xed
at slightly under 25kHz. This is accomplished by using an
internal timer that monitors the time between consecu-
tive high-side gate pulses. If the time exceeds 40約, DL
drives high to turn the low-side MOSFET on. This draws
current from V
OUT
through the inductor, forcing both V
OUT
and V
FB
to fall. When V
FB
drops to the 750mV threshold, the
next DH (the drive signal for the high side FET) on-time is
triggered. After the on-time is completed the high-side
MOSFET is turned off and the low-side MOSFET turns on.
The low-side MOSFET remains on until the inductor
current ramps down to zero, at which point the low-side
MOSFET is turned off .
Applications Information (continued)
相關PDF資料 |
PDF描述 |
|---|---|
| SC4250LISTRT | IC HOT SWAP CTRLR 8-SOIC |
| SC427MLTRT | IC REG DL BUCK/LINEAR 32MLPQ |
| SE95D,112 | IC SENSOR TEMP 2.8-5.5V SOT96-1 |
| SE97BTP,547 | IC TEMP SENSOR DIMM 8HWSON |
| SE98ATP,547 | IC TEMP SENSOR DDR 8-HWSON |
相關代理商/技術參數 |
參數描述 |
|---|---|
| SC4-25 | 制造商:JAMECO VALUEPRO 功能描述:CABLE,SHIELDED,4 CONDUCTOR,GRAY,24AWG,25 FEET,ROUND |
| SC4250 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Negative Voltage Hot Swap Controller |
| SC4250_05 | 制造商:SEMTECH 制造商全稱:Semtech Corporation 功能描述:Negative Voltage Hot Swap Controller |
| SC4250HISTR | 制造商:Semtech Corporation 功能描述: |
| SC4250HISTRT | 制造商:Semtech Corporation 功能描述:Hot Swap Controller 1-CH -80V 8-Pin SOIC T/R |
發布緊急采購，3分鐘左右您將得到回復。