LTC3261_15 Datasheet, PDF (1/14 Pages) Linear Technology – High Voltage, Low Quiescent Current Inverting Charge Pump

Features
n _{4.5V to 32V VIN Range}
n _{Inverting Charge Pump Generates –VIN}
n _{60µA Quiescent Current in Burst Mode}^® _Operation
n _{Charge Pump Output Current Up to 100mA}
n _{50kHz to 500kHz Programmable Oscillator}
Frequency
n _{Short-Circuit/Thermal Protection}
n _{Low Profile Thermally Enhanced 12-Pin MSOP}
Package
Applications
n _{Bipolar/Inverting Supplies}
n _{Industrial/Instrumentation Bias Generators}
n _{Portable Medical Equipment}
n _{Portable Instruments}
LTC3261
High Voltage,
Low Quiescent Current
Inverting Charge Pump
Description
The LTC^®3261 is a high voltage inverting charge pump
that operates over a wide 4.5V to 32V input range and
is capable of delivering up to 100mA of output current.
The charge pump employs either low quiescent current
Burst Mode operation or low noise constant frequency
mode. In Burst Mode operation the charge pump V_OUT
regulates to –0.94 • V_IN and the LTC3261 draws only 60µA
of quiescent current. In constant frequency mode the charge
pump produces an output equal to –V_IN and operates at
a fixed 500kHz or to a programmed frequency between
50kHz to 500kHz using an external resistor. The LTC3261
is available in a thermally enhanced 12-pin MSOP package.
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
Typical Application
15V to –15V Inverter
1µF
15V
10µF
C⁺
V_IN
C^–
V_OUT
LTC3261
EN
MODE
RT
–15V
10µF
GND
3261 TA01
V_OUT Ripple
V_OUT
10mV/DIV
AC-COUPLED
V_OUT
200mV/DIV
AC-COUPLED
MODE = L
MODE = H
V_OUT = –14.8V
V_OUT = –14.1V
V_IN = 15V
f_OSC = 500kHz
I_OUT = 5mA
100µs/DIV
3261 TA01a
For more information www.linear.com/3261
3261fb
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