Buck Controller. SC508A Datasheet

SC508A Controller. Datasheet pdf. Equivalent

Part SC508A
Description EcoSpeed DC-DC Buck Controller
Feature SC508/SC508A POWER MANAGEMENT EcoSpeed® DC-DC Buck Controller with Integrated LDO Features Descr.
Manufacture Semtech
Datasheet
Download SC508A Datasheet

SC508/SC508A POWER MANAGEMENT EcoSpeed® DC-DC Buck Control SC508A Datasheet
Recommendation Recommendation Datasheet SC508A Datasheet





SC508A
SC508/SC508A
POWER MANAGEMENT
EcoSpeed® DC-DC Buck Controller
with Integrated LDO
Features
Description
Power system
Input voltage — 4.5V to 46V
Output voltage — 0.6V to >85% x VIN
Integrated bootstrap switch
Fixed 5V LDO output — 200mA
1% reference
Selectable internal/external bias power supply
EcoSpeed® architecture with pseudo-fixed fre-
quency adaptive on-time control
The SC508/SC508A is a synchronous EcoSpeed® buck reg-
ulator which incorporates Semtech’s advanced, patented
adaptive on-time control architecture to provide excellent
light-load efficiency and fast transient response. It fea-
tures an integrated bootstrap switch and a fixed 5V LDO in
a 3 x 3(mm) package. The device is highly efficient and
uses minimal PCB area. The SC508A is available for auto-
motive applications and is qualified to AEC-Q100.
Logic input and output control
Independent control EN for LDO and switcher
Programmable soft-start time
•• PPorowgerar mGomoadboleuVtpINuUtVLO threshold
Selectable power-save mode for >80% effi-
ciency under light load
Programmable ultrasonic power-save mode
SmartDriveTM for reduced EMI
Protections
Automatic restart on fault shutdown
Over-voltage and under-voltage
•• TTChecrommapl sehnusatdteodwRnDS(ON) sensed current limit
Smart power-save
Pre-bias start-up
Capacitor types: SP, POSCAP, OSCON, and ceramic
Package — 3 x 3(mm), 20-pin MLPQ
The SC508 supports using standard capacitor types such as
electrolytic or special polymer, in addition to ceramic, at switch-
ing frequencies up to 1MHz. 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,
programmable soft-start, under and over-voltage protec-
tion, programmable over-current protection, start-up into
pre-biased output, automatic fault recovery (hiccup restart),
soft-shutdown, selectable power-save modes, and pro-
grammable 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. Output
voltage range is 0.6 to 5V, with output voltages greater than
5V supported using additional components.
Lead-free and halogen-free
RoHS and WEEE compliant
AEC-Q100 Qualified available in SC508A
The input voltage can range from 4.5V to 46V. The wide
input voltage range, programmable frequency, and inte-
grated 5V LDO make the device extremely flexible and
Applications
Office automation and computing
Networking and telecommunication equipment
easy to use in a broad range of applications. Support is
provided for multi-cell battery systems in addition to tra-
ditional DC power supply applications.
Point-of-load power supplies and module replacement
Automotive applications
Typical Application Circuit
PGOOD
ENABLE
ENABLE LDO
VEXT or VLDO
VEXT or VLDO
RTON
0.1µF
1µF
PGOOD
EN
ENL
TON
VDDA
VDDP
SC508
SC508A
VIN
DH
LX
BST
ILIM
DL
3.3O
RLIM
VIN
CIN
L1
+ COUT
VOUT
VLDO
1µF
10nF
VLDO
SS
PSV
VOUT
FB
AGND PGND
PSV
Revision 4.3
© 2012 Semtech Corporation




SC508A
SC508/SC508A
Pin Configuration
20 19 18 17 16
FB 1
Top View
15 PGOOD
VOUT
VDDA
2
3
AGND PAD
14 PSV
13 VDDP
VLDO
VIN
4
5
12 DL
11 PGND
6 7 8 9 10
Ordering Information
Device
Package
SC508ULTRT(1)(2)
SC508AULTRT(1)(2)(3)
SC508EVB
SC508AEVB
MLPQ-UT20
MLPQ-UT20
Evaluation Board
Evaluation Board
Notes:
1) Available in tape and reel only. A reel contains 3000 devices.
2) Lead-free packaging only. Device is WEEE and RoHS compliant
and halogen-free.
3) AEC-Q100 Qualified.
MLPQ-UT20
Marking Information
508
yyww
xxxx
yyww = Date Code
xxxx = Semtech Lot Number
508A
yyww
xxxx
yyww = Date Code
xxxx = Semtech Lot Number






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