LTC3426 Datasheet, PDF (1/12 Pages) Linear Technology – 1.2MHz Step-Up DC/DC Converter in SOT-23

LTC3426
1.2MHz Step-Up DC/DC
Converter in SOT-23
FEATURES
■ _{Internal 2A MOSFET Switch}
■ _{1.2MHz Switching Frequency}
■ _{Integrated Soft-Start}
■ _{VIN Range: 1.6V to 4.3V}
■ _{Low RDS(ON) Switch: 100mΩ at 5V Output}
■ _{Delivers 5V at 800mA from a 3.3V Input}
■ _{Delivers 3.3V at 800mA from a 2.5V Input}
■ _{Uses Small, Low Profile External Components}
■ _{Low Profile (1mm) SOT-23 (ThinSOT}^TM_{) Package}
U
APPLICATIO S
■ _{White LED Driver Supply}
■ _{Local 3.3V or 5V Supply}
■ _{Battery Back-Up}
TYPICAL APPLICATIO
3.3V to 5V Boost Converter
2.2µH
V_IN
3.3V
10µF
SW
V_IN
V_OUT
LTC3426
OFF ON
SHDN FB
GND
V_OUT
5V
800mA
22µF
3426 TA01
DESCRIPTIO
The LTC^®3426 step-up switching regulator generates an
output voltage of up to 5.5V from an input voltage as low
as 1.6V. Ideal for applications where space is limited, it
switches at 1.2MHz, allowing the use of tiny, low cost and
low profile external components. Its internal 2A, 100mΩ
NMOS switch provides high efficiency even at heavy load,
while the constant frequency, current mode architecture
results in low, predictable output noise that is easy to filter.
Antiringing circuitry reduces EMI concerns by damping
the inductor while in discontinuous mode, and internal
soft-start eases inrush current worries. Internal frequency
compensation is designed to accommodate ceramic out-
put capacitors, further reducing noise. The device features
very low shutdown current of 0.5µA.
The LTC3426 is available in the 6-lead SOT-23 package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
ThinSOT is a trademark of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
Protected by U.S. Patents, including 6498466, 6611131
Efficiency
100
V_IN = 3.3V
95 _{VOUT = 5V}
90
85
80
75
70
65
60
55
50
1
10
100
LOAD CURRENT (mA)
1000
3426 TA01b
3426f
1