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Linear Technology Electronic Components Datasheet

LTC3261 Datasheet

Low Quiescent Current Inverting Charge Pump

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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 VOUT
regulates to –0.94 • VIN and the LTC3261 draws only 60µA
of quiescent current. In constant frequency mode the charge
pump produces an output equal to –VIN 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+
VIN
C
VOUT
LTC3261
EN
MODE
RT
GND
–15V
10µF
3261 TA01
VOUT Ripple
VOUT
10mV/DIV
AC-COUPLED
VOUT
200mV/DIV
AC-COUPLED
MODE = L
MODE = H
VOUT = –14.8V
VOUT = –14.1V
VIN = 15V
fOSC = 500kHz
IOUT = 5mA
100µs/DIV
3261 TA01a
For more information www.linear.com/3261
3261fb
1


Linear Technology Electronic Components Datasheet

LTC3261 Datasheet

Low Quiescent Current Inverting Charge Pump

No Preview Available !

LTC3261
Absolute Maximum Ratings
(Notes 1, 3)
VIN, EN, MODE............................................ –0.3V to 36V
VOUT............................................................ –36V to 0.3V
RT................................................................. –0.3V to 6V
VOUT Short-Circuit Duration.............................. Indefinite
Operating Junction Temperature Range
(Note 2)................................................... –55°C to 150°C
Storage Temperature Range.................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec).................... 300°C
Pin Configuration
TOP VIEW
NC 1
12 NC
RT 2
11 MODE
NC 3 13 10 EN
VOCU–T
4
5
GND
9
8
VCI+N
NC 6
7 NC
MSE PACKAGE
12-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 40°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3261EMSE#PBF
LTC3261EMSE#TRPBF 3261
12-Lead Plastic MSOP
–40°C to 125°C
LTC3261IMSE#PBF
LTC3261IMSE#TRPBF 3261
12-Lead Plastic MSOP
–40°C to 125°C
LTC3261HMSE#PBF
LTC3261HMSE#TRPBF 3261
12-Lead Plastic MSOP
–40°C to 150°C
LTC3261MPMSE#PBF
LTC3261MPMSE#TRPBF 3261
12-Lead Plastic MSOP
–55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3261fb
2 For more information www.linear.com/3261


Part Number LTC3261
Description Low Quiescent Current Inverting Charge Pump
Maker Linear
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LTC3261 Datasheet PDF





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