SC3303MLTRT Datasheet, PDF (1/26 Pages) Semtech Corporation – 3A EcoSpeed Step-Down Regulator with LDO and Ultrasonic Power Save

SC3303
3A EcoSpeed^® Step-Down Regulator
with LDO and Ultrasonic Power Save
POWER MANAGEMENT
Features
Description
„ Input voltage — 5.5V to 28V
„ Output voltage — 0.75V to 7.5V
„ Output current — Up to 3A
„ Internal reference — + 1%
„ Small ceramic capacitors
„ Power good pin (open-drain)
„ Adaptive on-time control:
• Excellent transient response
• Programmable pseudo-fixed frequency during
CCM
„ Fault protection features:
• Cycle-by-cycle current limit
• Short circuit protection
• Over and under output voltage protection
• Over-temperature
„ Internal soft-start
„ Ultrasonic power save and smart PSAVE
„ Internal LDO for bias voltage
„ Ultra-small lead-free 3 x 3(mm), 10-Pin MLPD package
„ WEEE and RoHS compliant and halogen free
Applications
„ Networking Equipment, Embedded Systems
„ Medical Equipment, Office Automation
„ Instrumentation, Portable Systems
„ Consumer Devices such as DTV and Set-top Boxes
„ POL Converters
The SC3303 is an integrated, synchronous 3A EcoSpeed^®
step-down regulator. It incorporates Semtech’s advanced,
patented adaptive on-time architecture to achieve best-
in-class dynamic performance using point-of-load appli-
cations. The input voltage range is 5.5V to 28V with a
programmable output voltage from 0.75V up to 7.5V. The
device features an internal LDO and ultrasonic PSAVE
mode for high efficiency across the output load range.
Adaptive on-time control provides programmable
pseudo-fixed frequency operation in continuous conduc-
tion and excellent transient performance. The switching
frequency can be set from 200kHz to 1MHz, allowing the
designer to reduce external LC filtering and minimize light
load (standby) losses.
Additional features include cycle-by-cycle current limit,
soft start, input UVLO and output OV protection, and over
temperature protection. The open-drain PGOOD pin pro-
vides output status. Standby current is less than 10μA
when disabled.
The device is available in a low profile, thermally enhanced
MLPD 3 x 3mm 10-pin package.
Typical Application Circuit
Enable
V_IN
C_IN
R_TON
C_LDO2
C_LDO1
SC3303
EN
PGOOD
VIN
BST
LX
TON
LDO
AGND
FB
PGND
C_BST
L1
C_OUT
PGOOD
V_OUT
R_TOP
R_BOT
Rev. 2.0
© 2011 Semtech Corporation
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