SC220(2012) Просмотр технического описания (PDF) - Semtech Corporation
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SC220 Datasheet PDF : 14 Pages
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SC220
POWER MANAGEMENT
20MHz, 650mA, X-EMI™-Enabled
Synchronous Step-Down Regulator
Features
Patented X-EMITM Inductor Technology
Enables Trace Inductors in PC Board Material
Excellent EMI Performance
Efficiency up to 90%
19μA Quiescent Current under Very Light-load
Wide Input Voltage Range — 2.7V to 5.5V
Adjustable Output Voltage Down to 1.0V
Output DC Current — up to 650mA
High Light-load Efficiency via Automatic PSAVE Mode
Ultra-fast Transient Response — <1μs
Temperature Range — -40 to +85°C
Shutdown Current — 0.1μA (typical)
Requires Tiny 220nH Inductor
Requires Only 1μF of Output Capacitance
External Switching Frequency Synchronization
Protection Features Including
Over-Current Protection
Output Short-Circuit Protection
Thermal Shutdown Protection
Offered in SOIC 8 Lead Package
Lead-free, Halogen-free, and RoHS/WEEE Compliant
Applications
Description
The SC220 is a 20MHz X-EMI™(1)-enabled step-down regu-
lator optimized for powering low voltage rails from 2.7 to
5.5V input voltage. X-EMI™ inductor technology enables
inductors to be drawn directly on the PC board. This tech-
nology meets or exceeds the EMI performance of chip
inductors and eliminates the need for discrete inductors.
The SC220 uses a unique constant frequency, self-oscil-
lating control loop architecture to provide excellent
transient performance. Under light load condition, the
device operates in Power Save Mode (PSAVE) and main-
tains a typical quiescent current of 19μA. At moderate to
heavy loads, this part operates in PWM mode with a con-
stant switching frequency of 20MHz. This high switching
frequency offers the advantages of using small and low
cost external components like a 1μF external capacitor
and a small 220nH inductor (including X-EMITM PCB trace
inductors).
The device provides adjustable output voltages down to
1.0V and an output current up to 650mA. An EN pin can
be used to synchronize to an external source and includes
de-glitching to reduce noise sensitivity.
HDTV, Set Top Boxes, Gaming Consoles
POL Applications
White Goods
Automotive (EMI sensitive console applications)
Typical Application Circuit
The SC220 is available in SOIC 8 lead package.
Note 1: Purchase of SC220 includes royalty-free rights to use X-EMITM
inductor technology with no additional cost.
V IN
2.7~5.5V
C IN
1 μF
P V IN
SW
A V IN
VOUT
SC220
V OUT= 1 .8 V
L, 220nH up to 650mA
R1
COUT
1 μF
E n a b le
EN
PGND
AGND
FB
R2
January 25, 2012
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