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WillSEMI |
WD3133
HIGH EFFICIENCY, 1.2-MHz DC-DC STEP-UP
CONVERTERS
Descriptions
The WD3133 is a high efficiency, high power, peak
current mode step-up converter. Internal 0.35Ω HV
power MOSFET with Min. 1A current limit. For portable
device with Li-ion battery application, WD3133 could
output typical 12V / 200mA ~300mA from 3.3V~5V
input.
The boost converter WD3133 runs in Pulse-Width
Modulation (PWM) mode, at 1.2MHz fixed switching
frequency to reduce output ripple, improve conversion
efficiency. It allows for the use of small external
components. At light load currents the converter enters
Skipping Mode to maintain a high efficiency over a
wide load current range. The build-in soft start circuitry
minimizes the inrush current at start-up.
The WD3133 is available in SOT-23-5L package.
Standard product is Pb-free and Halogen-free.
Features
Wide input voltage range from 2.7-V to 5.5-V
1.25-V (±2%) high accuracy reference voltage
1.2-MHz switching frequency
Up to 93% efficiency
Over 1-A (min.) power switch current limit
Provide typical 12V / 200mA~300mA output from
3.3V~5V input
Built-in Soft-Start
Applications
Smart Phones
Tablets
Portable games
PADs
WD3133
Http//:www.sh-willsemi.com
SOT-23-5L
LX 1
GND
2
FB 3
5 VIN
4 EN
Pin configuration (Top view)
54
3133
EAYW
1 23
3133 = Device code
EA = Special code
Y = Year code
W = Week code
Marking
Order information
Device
Package
Shipping
WD3133E-5/TR SOT-23-5L 3000/Reel&Tape
Will Semiconductor Ltd.
1 Aug, 2016 - Rev. 1.2
WD3133
Typical applications
Pin descriptions
VIN
CIN
10μF
ON/OFF
L1
10μH
WSB5508L VOUT
VIN LX
COUT
10μF
R1
EN
GND
FB
R2
Symbol
LX
GND
FB
EN
VIN
SOT-23-5L
1
2
3
4
5
Descriptions
Switch Node
Ground
Feedback
Enable, Active High
Power Supply
Block diagram
VIN UVLO
EN Chip Enable
Thermal
Shutdown
PWM
COMP
Current
Sense
PWM
Logic
Gate
Driver
ISENSE
Current
Limit
OSC
1.2MHz
Soft
Start
EA VREF
LX
FB
GND
Will Semiconductor Ltd.
2 Aug, 2016 - Rev. 1.2
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