參數(shù)資料
型號： SC427MLTRT
廠商： Semtech
文件頁數(shù)： 1/33頁
文件大小： 894K
描述： IC REG DL BUCK/LINEAR 32MLPQ
標(biāo)準(zhǔn)包裝： 1
系列： EcoSpeed®, SmartDrive™
拓?fù)洌?/td> 降壓（降壓）（1），線性（LDO）（1）
功能： 任何功能
輸出數(shù)： 2
頻率 - 開關(guān)： 1MHz
電壓/電流 - 輸出 1： 可調(diào)，10A
電壓/電流 - 輸出 2： 5V，200mA
帶 LED 驅(qū)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(yīng)商設(shè)備封裝： 32-MLPQ（5x5）
包裝： 標(biāo)準(zhǔn)包裝
其它名稱： SC427MLDKR
?2010 Semtech Corporation
1
SC417/SC427
10A EcoSpeed
TM
 Integrated FET
Regulator with Programmable LDO
Features
Power system:
Input voltage  3V to 28V
Integrated bootstrap switch
Programmable LDO output  200mA
1% reference tolerance  -40 to +85 癈
Selectable internal/external bias power supply
EcoSpeed
TM
 architecture with pseudo-fixed fre-
quency adaptive on-time control
Logic input/output control
Independent control EN for LDO and switcher
Programmable V
IN
 UVLO threshold
Power good output
Selectable ultrasonic/power save methods
Protections
Over-voltage/under-voltage
TC compensated R
DS(ON)
 sensed current limit
Thermal shutdown
Output capacitor types
High ESR  SP, POSCAP, OSCON
Ceramic capacitors
Package  5x5mm, 32-pin MLPQ
Lead-free and halogen free
RoHS and WEEE compliant
Applications
Office automation and computing
Networking and telecommunication equipment
Point-of-load power supplies and module replacement.
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Description
The SC417/SC427 is a stand-alone synchronous
EcoSpeed
TM
buck regulator which incorporates Semtechs
advanced, patented adaptive on-time control architecture
to provide excellent light-load efficiency and fast transient
response. It features integrated power MOSFETs, a boot-
strap switch, and a programmable LDO in a 5x5mm
package. The device is highly efficient and uses minimal
15x20mm PCB area for a total converter solution. Refer to
page 16 for information on the C-SIM simulation tool.
The SC417/SC427 supports using standard capacitor types
such as electrolytic or special polymer, in addition to
ceramic, at switching frequencies up to 1MHz. The pro-
grammable frequency, synchronous operation, and select-
able power-save provide high efficiency operation over a
wide load range. In power-save mode, the minimum oper-
ating frequency for the SC417 is 25kHz whereas the SC427
has no minimum.
Additional features include internal soft-start, program-
mable cycle-by-cycle over-current limit protection, under
and over-voltage protections and soft shutdown. The
device also provides separate enable inputs for the PWM
controller and LDO as well as a power good output for the
PWM controller.
The wide input voltage range, programmable frequency,
and programmable LDO make the device extremely flexible
and easy to use in a broad range of applications. Support is
provided for single cell or multi-cell battery systems in addi-
tion to traditional DC power supply applications.
May 20, 2010
POWER MANAGEMENT
SC417/SC427
V5V
BST
LX
PGOOD
ILIM
LXS
EN/PSV
TON
ENL
LXBST
RILIM
CBST
+
RFB1
RFB2
VOUT
COUT
1礔
L1
VEXT/LDO
CIN
PGND
AGND
VIN
VIN
VOUT
FB
PGOOD
ENABLE LDO
ENABLE/PSAVE
RTON
Typical Application Circuit
US Patent: 7,714,547 B2
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