SC202AMLTRT Datasheet, PDF (1/19 Pages) Semtech Corporation – 3.5MHz, 500mA Step-down Regulator

POWER MANAGEMENT
SC202A
3.5MHz, 500mA Step-down Regulator
With Integrated Inductor
and Digital Programmable Output
Features
Description
 Input Voltage — 2.9V to 5.5V
 Output Voltage — 0.8V to 3.3V
 Output current capability — 500mA
 Internal inductor
 Programmable output voltages — 15
 High light-load efficiency via automatic PSAVE mode
 Fast transient response
 Temperature range — -40 to +85°C
 Oscillator frequency — 3.5MHz
 100% duty cycle capability
 Quiescent current — 38µA typical
 Shutdown current — 0.1µA typical
 Internal soft-start
 Over-voltage protection
 Current limit and short circuit protection
 Over-temperature protection
 Under-voltage lockout
 Floating control pin protection
 MLPQ-13 — 2.5 x 3.0 x 1.0 (mm) package
 Lead-free and halogen-free
 WEEE and RoHS compliant
Applications
 Point of load regulation
 Smart phones and cellular phones
 MP3/personal media players
 Personal navigation devices
 Digital cameras
 Single Li-ion cell or 3 NiMH/NiCd cell devices
 Devices with 3.3V or 5V internal power rails
The SC202A is a high efficiency 500mA step-down regula-
tor that includes an integrated inductor inside the
package. The input voltage range makes it ideal for
battery operated applications with space limitations. The
SC202A also includes 15 programmable output voltage
settings that can be selected using the four control pins,
eliminating the need for external feedback resistors. The
output voltage can be fixed to a single setting or dynami-
cally switched between different levels. Pulling all four
control pins low disables the output.
The SC202A operates at a fixed 3.5MHz switching fre-
quency in normal PWM (Pulse-Width Modulation) mode.
A variable frequency PSAVE (power-save) mode is used to
optimize efficiency at light loads for each output setting.
Built-in hysteresis prevents chattering between the two
modes.
The SC202A provides several protection features. These
include short circuit protection, over-temperature protec-
tion, under-voltage lockout, and soft-start to control
in-rush current. These features, coupled with the small
2.5 x 3.0 x 1.0 (mm) package, make the SC202A a versatile
device ideal for step-down regulation in products needing
high efficiency and a small PCB footprint.
Typical Application Circuit
V_IN
2.9V to 5.5V
CIN
4.7µF
SC202A
IN
SNS
OUT
Control Logic
Lines
CTL3
CTL2
CTL1
CTL0
GND
LX NC
VOUT
0.8V to 3.3V
COUT
10µF
Rev. 1.2
© 2011 Semtech Corporation