LTC3459_07 Datasheet, PDF (1/12 Pages) Linear Technology – 10V Micropower Synchronous Boost Converter

LTC3459
10V Micropower
Synchronous Boost Converter
FEATURES
n _{Small Solution Size}
n _{>85% Efficiency over Wide Load Range}
n _{Internal Synchronous Rectifier}
n _{VIN Range: 1.5V to 5.5V}
n _{5V at 30mA from 3.3V Input}
n _{3.3V at 20mA from 2 AA Cell Input}
n _{Programmable Output Voltages Up to 10V}
n _{Burst Mode}^® _Operation
n _{Inrush Current Limiting}
n _{Output Disconnect in Shutdown}
n _{Ultralow Quiescent (10μA) and Shutdown (<1μA)}
Currents
n _{Low Profile 2mm × 2mm DFN, 2mm × 3mm DFN or}
SOT-23 Package
APPLICATIONS
n _{General Purpose Micropower Boost}
n _{Digital Cameras}
n _PDAs
n _{LCD Bias}
n _{Small OLED Displays}
n _{Supercap Charging}
DESCRIPTION
The LTC^®3459 is a low current, high efficiency synchronous
boost converter intended for low power, size constrained
portable applications. The LTC3459 can be powered from
a single lithium ion battery, a 2- to 3-cell stack of alkaline
or nickel batteries, or any low impedance voltage source
between 1.5V and 5.5V. The output is programmable via
an external divider between 2.5V and 10V. Although the
part is primarily intended for boost applications, V_OUT will
maintain regulation below V_IN (at reduced efficiency).
The LTC3459 offers Burst Mode operation with a fixed
peak current, providing high conversion efficiency over
a wide range of load currents. During start-up, inductor
current is controlled preventing the inrush surge current
found in many boost converters. In shutdown the output
is disconnected from the input and quiescent current is
reduced to <1μA.
The LTC3459 is offered in low profile 6-pin 2mm × 2mm
DFN, 2mm × 3mm DFN or SOT-23 (ThinSOT^TM) packages,
allowing a tiny footprint for the total solution.
, LT, LTC, LTM and Burst Mode 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.
TYPICAL APPLICATION
5V to 8V Converter
5V
1μF
22μH
OFF ON
SW
V_IN
V_OUT
LTC3459
SHDN FB
GND
2M
365k
47pF
V_OUT
8V
30mA
4.7μF
3459 TA01a
Efficiency
100
V_IN = 5V
V_OUT = 8V
90
80
70
60
50
0.01
0.1
1
I_LOAD (mA)
10
100
3459 TA01b
3459fc
1