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UD05208 Datasheet Preview

UD05208 Datasheet

SYNCHRONOUS STEP-DOWN CONVERTER

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UNISONIC TECHNOLOGIES CO., LTD
UD05208
Preliminary
1.5MHz, 2A, VFB=0.6V
SYNCHRONOUS STEP-DOWN
CONVERTER
CMOS IC
DESCRIPTION
UTC UD05208 devices are synchronous step-down converters
optimized for small solution size and high efficiency. The devices
integrate switches capable of delivering an output current up to 2A.
The devices are based on an adaptive on time with valley current
mode control scheme. Typical operating frequency is 1.5MHz at
medium to heavy loads. The devices are optimized to achieve very
low output voltage ripple even with small external components and
feature an excellent load transient response. During a light load,
the UD05208 automatically enter into Power Save Mode at the
lowest quiescent current (50μA typ) to maintain high efficiency over
the entire load current range. In shutdown, the current consumption
is reduced to 1μA. The UD05208 provide an adjustable output
voltage via an external resistor divider. The output voltage start-up
ramp is controlled by an internal soft start, typically 250 μs. Power
sequencing is possible by configuring the Enable pin. Other
features like over current protection and over temperature
protection are built in.
FEATURES
* 2.7V to 5.5V Input Voltage Range
* 1.5MHz Typical Switching Frequency
* Output Current up to 2A
* Adaptive On-Time Current Control
* Power Save Mode for Light Load Efficiency
* 50μA Operating Quiescent Current
* Over Current Protection
* Internal Soft Startup of 250μs (Typ.)
* Adjustable Output Voltage
* Thermal Shutdown Protection
* Available in SOT25 Package
ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
UD05208L-AF5-R
UD05208G-AF5-R
Package
SOT-25
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2018 Unisonic Technologies Co., Ltd
1 of 7
QW-R115-028.a




UTC

UD05208 Datasheet Preview

UD05208 Datasheet

SYNCHRONOUS STEP-DOWN CONVERTER

No Preview Available !

UD05208
MARKING
Preliminary
PIN CONFIGURATION
CMOS IC
PIN DESCRIPTION
PIN NO.
1
2
3
4
5
PIN NAME
EN
GND
SW
VIN
FB
DESCRIPTION
Enable pin
H: Normal operationL: Shutdown
Ground Pin
Switch pin connected to the internal MOSFET switches and inductor terminal. Connect the inductor
of the output filter to this pin.
Power Supply Input Pin
Feedback pin for the internal control loop. Connect this pin to the external feedback divider.
BLOCK DIAGRAM
VIN
Thermal
Shutdown
UVLO
EN
Control Logic
Current Limit
Detect
Soft Start
FB
Vref
GM
SW
PWM
Gate Drive
Valley
Current
Detect
PMOS
NMOS
SW
GND
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
2 of 7
QW-R115-028.a


Part Number UD05208
Description SYNCHRONOUS STEP-DOWN CONVERTER
Maker UTC
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UD05208 Datasheet PDF






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