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參數(shù)資料
| 型號： | SC427MLTRT |
| 廠商： | Semtech |
| 文件頁數(shù)： | 14/33頁 |
| 文件大?。?/td> | 894K |
| 描述： | IC REG DL BUCK/LINEAR 32MLPQ |
| 標準包裝： | 1 |
| 系列： | EcoSpeed®, SmartDrive™ |
| 拓撲： | 降壓（降壓）（1），線性（LDO）（1） |
| 功能： | 任何功能 |
| 輸出數(shù)： | 2 |
| 頻率 - 開關： | 1MHz |
| 電壓/電流 - 輸出 1： | 可調，10A |
| 電壓/電流 - 輸出 2： | 5V，200mA |
| 帶 LED 驅動器： | 無 |
| 帶監(jiān)控器： | 無 |
| 帶序列發(fā)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： | 32-VFQFN 裸露焊盤 |
| 供應商設備封裝： | 32-MLPQ（5x5） |
| 包裝： | 標準包裝 |
| 其它名稱： | SC427MLDKR |
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頁當前第14頁第15頁第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頁第30頁第31頁第32頁第33頁
SC417/SC427
14
Pin Descriptions
Pin # Pin Name Pin Function
1
FB
Feedback input for switching regulator used to program the output voltage connect to an external resis-
tor divider from VOUT to AGND.
2
FBL
Feedback input for the LDO connect to an external resistor divider from VLDO to AGND used to pro-
gram the LDO output.
3
V5V
5V power input for internal analog circuits and gate drives connect to external 5V supply or configure
the LDO for 5V and connect to VLDO.
4, 30, PAD 1 AGND Analog ground
5
VOUT
Switcher output voltage sense pin also the input to the internal switch-over between VOUT and VLDO.
The voltage at this pin must be less than or equal to the voltage at the V5V pin.
6, 9-11,
PAD 2
VIN Input supply voltage
7
VLDO LDO output The voltage at this pin must be less than or equal to the voltage at the V5V pin.
8
BST
Bootstrap pin connect a capacitor of at least 100nF from BST to LX to develop the floating supply for the
high-side gate drive.
12
DH High-side gate drive do not connect this pin
13
LXBST LX Boost connect to the BST capacitor.
23-25, PAD 3
LX Switching (phase) node
14
DL Low-side gate drive do not connect this pin
15-22
PGND Power ground
26
PGOOD
Open-drain power good indicator high impedance indicates power is good. An external pull-up
resistor is required.
27
ILIM Current limit sense pin used to program the current limit by connecting a resistor from ILIM to LX.
28
LXS LX sense connects to R
ILIM
.
29
EN/PSV
Enable/power-save input for the switching regulator connect to AGND to disable the switching regulator.
Float to operate in forced continuous mode (power-save disabled). SC417 connect to V5V to operate with
ultra-sonic power-save mode enabled. SC427 connect to V5V to operate with power-save mode enabled
with no minimum frequency.
31
TON On-time programming input set the on-time by connecting through a resistor to AGND
32
ENL
Enable input for the LDO connect ENL to AGND to disable the LDO. Drive with logic to +3V for logic con-
trol, or program the VIN UVLO with a resistor divider between VIN, ENL, and AGND.
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