SC220_13 Datasheet, PDF (1/14 Pages) Semtech Corporation – 20MHz, 650mA, X-EMI™-Enabled Synchronous Step-Down Regulator

SC220 x
SC220Q
POWER MANAGEMENT
20MHz, 650mA, X-EMI^™-Enabled
Synchronous Step-Down Regulator
Features
 Patented X-EMI^TM Inductor Technology
 Enables Trace Inductors in PC Board Material
 Excellent EMI Performance
 Efficiency up to 90%
 19µA Quiescent Current under Very Light Loads
 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
 AEC-Q100 Qualified Version Available
Applications
 HDTV, Set Top Boxes, Gaming Consoles
 POL Applications
 White Goods
 Automotive AEC-Q100 Qualified Applications
Typical Application Circuit
Description
The SC220/Q is a 20MHz X-EMI™⁽¹⁾-enabled step-down
regulator optimized for power 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 technology meets or exceeds the EMI performance
of chip inductors and eliminates the need for discrete
inductors.
The SC220/Q uses a unique constant frequency, self-
oscillating control loop architecture to provide excellent
transient performance. Under light loads, the device
operates in Power Save mode(PSAVE) maintaining a
typical quiescent current of 19µA. At moderate to heavy
loads, this part operates in PWM mode with a constant
switching frequency of 20MHz. This high switching fre-
quency offers the advantages of using small and low cost
external components like a 1µF external capacitor and a
small 220nH inductor (including X-EMI^TM 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.
The SC220/Q is available in SOIC 8 lead package.
The SC220Q is an AEC-Q100 qualified version.
Note 1: Purchase of SC220/Q includes royalty-free right to use X-EMI^TM inductor technology with no addi-
tional cost.
V _IN
2.7~5.5V
C _IN
1 µF
E n a b le
P V IN
SW
A V IN
VOUT
SC220
SC220Q
EN
FB
PGND
AGND
L, 220nH
V OUT= 1 .8 V
up to 650mA
R₁
C_OUT
1 µF
R₂
January 15, 2013