Semtech Corporation
SC418
EcoSpeed
TM
DC-DC Buck Controller
with Programmable LDO
Features
Power system
Input voltage 3V to 28V
Integrated bootstrap switch
Programmable LDO output 200mA
% 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 power save mode
Programmable ultrasonic power save mode
Protections
Over-voltage/under-voltage
TC compensated R
DS(ON)
sensed current limit
Thermal shutdown
Smart power save
Output capacitor types
High ESR SP, POSCAP, OSCON
Ceramic capacitors
Package 3 x 3mm, 20-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 SC48 is a synchronous EcoSpeed
TM
buck regulator
which incorporates Semtechs advanced, patented adap-
tive on-time control architecture to provide excellent
light-load efficiency and fast transient response. It fea-
tures an integrated bootstrap switch and programmable
LDO in a 3 x 3mm package. The device is highly efficient
and uses minimal PCB area.
The SC48 supports using standard capacitor types such
as electrolytic or special polymer, in addition to ceramic, at
switching frequencies up to MHz. The programmable
frequency, synchronous operation, and programmable
power-save provide high efficiency operation over a wide
load range.
Additional features include cycle-by-cycle current limit,
soft-start, under and over-voltage protection, program-
mable over-current protection, soft shutdown, selectable
power-save modes, and programmable ultrasonic power-
save. 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 input voltage can range from 3V to 28V. The wide
input voltage range, programmable frequency, and pro-
grammable 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
addition to traditional DC power supply applications.
Rev 2.0
POWER MANAGEMENT
Typical Application Circuit
VDDA
PGOOD
EN
TON
ENL
1礔
VEXT or VLDO
PGND
AGND
VLDO
ENABLE LDO
RTON
SC418
VDDP
VLDO
FBL
0.1礔
1礔
ENABLE
PGOOD
PSV
PSV
LX
ILIM
RILIM
+
VOUT
COUT
L1
VOUT
FB
CIN
DH
BST
DL
VIN
VIN
VEXT or VLDO
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