SC403BEVB View Datasheet(PDF) - Semtech Corporation
Part Name
Description
MFG CO.
SC403BEVB Datasheet PDF : 32 Pages
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SC403B
6A EcoSpeed® Integrated FET
Regulator with Programmable LDO
POWER MANAGEMENT
Features
Description
Power System:
• Input voltage — 3V to 28V
• Internal or external bias voltage — 3V to 5.5V
• Reference Voltage — 600mV
• Integrated bootstrap switch
• Programmable LDO output — 200mA
• 1% reference tolerance -40 to +85 °C
• EcoSpeed® architecture with pseudo-fixed fre-
quency adaptive on-time control
Logic Input/Output Control:
• Independent control EN for LDO and switcher
• Programmable VIN UVLO threshold
• Power good output
• Selectable power save mode
• Programmable soft start time
Protections:
• Over-voltage and under-voltage
• TC compensated RDS(ON) sensed current limit
• Thermal shutdown
Any ESR — SP, POSCAP, OSCON, and ceramic capacitors
Package:
• Lead-free package — 5x5mm, 32-pin MLPQ
• Fully RoHS/WEEE compliant and halogen-free
Applications
Office automation and computing
Networking and telecommunication equipment
Point of load power supplies and module replacement
The SC403B is a stand-alone synchronous EcoSpeed® buck
power supply which incorporates Semtech’s advanced
patented adaptive on-time control architecture. It pro-
vides 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
PCB area.
The SC403B supports using standard capacitor types such
as electrolytic or special polymer, in addition to ceramic, at
switching frequencies up to 1MHz. The programmable
frequency, synchronous operation, and selectable power-
save provide high efficiency operation over a wide load
range.
Additional features include a programmable soft-start,
programmable cycle-by-cycle over-current limit protec-
tion, under and over-voltage protections, soft shutdown,
and selectable power-save. The device also provides sep-
arate enable inputs for the PWM controller and LDO as
well as a power good output for the PWM controller.
The wide input and bias voltage ranges, programmable
frequency, and programmable LDO make the device
extremely flexible and easy to use in a broad range of
applications. The SC403B can be used in server computers
and single cell or multi-cell battery systems in addition to
traditional DC power supply applications.
Typical Application Circuit
ENABLE/PSAVE
ENABLE LDO
RTON
ENL
TON
10Ω
VEXT/LDO
VDD
1µF
CSOFT
SS
BST
VIN
CIN
VIN
CBST
SC403B
LXS
PGOOD
VOUT
RILIM
LX
L1
COUT
RFB1
+
FB
RFB2
PGOOD
VOUT
Rev. 2.1
© 2011 Semtech Corporation
US Patent: 2010/0033215A1
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