SC189ASK.TRT Datasheet, PDF (1/24 Pages) Semicoa Semiconductor – 2.5MHz, 1.5A Synchronous Step Down Regulator

POWER MANAGEMENT
Features
 V_IN Range: 2.9 – 5.5V
 V_OUT Options: 1.0 - 3.3V
 Up to 1.5A Output Current
 Ultra-Small Footprint, <1mm Height Solution
 2.5MHz Switching Frequency
 Efficiency Up to 93%
 Low Output Noise Across Load Range
 Excellent Transient Response
 Start Up into Pre-Bias Output
 100% Duty-Cycle Low Dropout Operation
 <1µA Shutdown Current
 Internal Soft Start
 Input Under-Voltage Lockout
 Output Over-Voltage, Current Limit Protection
 Over-Temperature Protection
 Adjustable Output Voltage
 Available in SOT23-5 package and 2mm x 2mm x
0.6mm thermally enhanced MLPD-UT6 package
 -40 to +85°C Temperature Range
 Fully WEEE and RoHS Compliant
Applications
 Bluetooth Radios
 DSC and PMPs
 GPS Devices
 xDSL Systems
 POL Regulators
 Portable HDD
 Wireless LAN
Typical Application Circuit
V_IN
2.9V to 5.5V
C_IN
10µF
SC189C
L
1µH
VIN
LX
EN VOUT
GND
SC189
2.5MHz, 1.5A Synchronous
Step Down Regulator
Description
The SC189 is a high efficiency, synchronous step-down
regulator providing up to 1.5A output current in either
an ultra-small 2mm x 2mm, low profile package or a low
cost SOT23-5 package. The device requires only three
external filter components for a complete step down
regulator solution. The input voltage range is 2.9 to 5.5V
with either factory programmed outputs from 1.0 to 3.3V
or adjustable output via an external resistor divider.
The converter operates at fixed 2.5MHz switching
frequency allowing small L/C filtering components.
The voltage mode architecture is compatible with chip
inductors and capacitors for minimum PCB footprint and
lowest overall system cost. Total footprint of 25mm² can
be achieved - making the SC189 the ideal solution for
high density systems. Solution height of <1mm is also
possible.
Up to 93%
switches.
efficiency is achieved with
PWM constant frequency
olopweraRt^Di^So^(On^N)
internal
ensures
low output ripple across the load range. 100% duty-cycle
provides 360mV dropout voltage at 1.5A which extends
the minimum input voltage for 2.5V and 3.3V outputs.
Excellent transient response is achieved with no external
compensation components.
The SC189 provides input under-voltage, output over-
voltage, output short circuit and over-temperature
protection to safeguard the device and system under fault
conditions. The regulator provides integrated soft-start to
minimize inrush currents. Standby quiescient current is
less than 1µA.
The SC189 is available in SOT23-5 and a thermally
enhanced 2mm x 2mm x 0.6mm MLPD-UT6 package.
C_OUT
22µF
V_OUT
1.20V/1.5A
Total PCB Area ~25mm²
L
Chip
C_OUT
0805
S C1 8 9
C_IN
0603
August 27, 2010
Actual Size

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