SC202 Datasheet, PDF (1/19 Pages) Semtech Corporation – 3.5MHz, 500mA Step-down Regulator with Integrated Inductor

SC202
POWER MANAGEMENT
3.5MHz, 500mA Step-down
Regulator with Integrated Inductor
Features
Description
 Input Voltage — 2.9V to 5.5V
 Output Voltage — 0.8V to 3.3V
 Output current capability — 500mA
 Internal inductor
 15 programmable output voltages
 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 typ
 Shutdown current — 0.1µA typ
 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 SC202 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
SC202 also includes fifteen 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 SC202 operates at a fixed 3.5MHz switching frequency
in normal PWM (Pulse-Width Modulation) mode. A vari-
able 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 SC202 provides several protection features to safe-
guard the device under stressed conditions. 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 SC202 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
C_IN
4.7µF
SC202
IN
SNS
OUT
V_OUT
0.8V to 3.3V
Control Logic
Lines
CTL3
CTL2
CTL1
CTL0
GND
LX NC
C_OUT
10µF
June 30, 2010
© 2010 Semtech Corporation