SC221 Datasheet, PDF (1/14 Pages) Polyfet RF Devices – SILICON GATE ENHANCEMENT MODE RF POWER VDMOS TRANSISTOR

SC221 x
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%
„„ 17.5µA 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 MLPD-UT 8 Lead Packages
„„ Lead-free, Halogen-free, and RoHS/WEEE Compliant
Applications
„„ HDTV, Set Top Boxes, Gaming Consoles
„„ POL Applications
„„ White Goods
Description
The SC221 is a 20MHz X-EMI™⁽¹⁾-enabled step-down regu-
lator 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 tech-
nology meets or exceeds the EMI performance of chip
inductors and eliminates the need for discrete inductors.
The SC221 uses a unique constant frequency, self-oscil-
lating 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 17.5µA. 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 SC221 is available in MLPD-UT 8 Lead package.
Note 1: Purchase of SC221 includes royalty-free right to use X-EMI^TM inductor technology with no addi-
tional cost.
Typical Application Circuit
V_IN
2.7~5.5V
C_IN
1 µF
Enable
PVIN
SW
AVIN
VOUT
SC221
VOUT=1.8V
L, 220nH _{up to 650mA}
R₁
C_OUT
1 µF
EN
PGND
AGND
FB
R₂
Revision 2.0
© 2016 Semtech Corporation
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