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PDF LTC3261 Data sheet ( Hoja de datos )
| Número de pieza | LTC3261 | |
| Descripción | Low Quiescent Current Inverting Charge Pump | |
| Fabricantes | Linear | |
| Logotipo |  |
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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
1 page  
LTC3261
Typical Performance Characteristics
(TA = 25°C, CFLY = 1µF, CIN = COUT = 10µF unless otherwise noted)
vVsolOtaugtpeuLtoCsusrr(eVnINt – |VOUT|)
(Constant Frequency Mode)
3.0
fOSC = 50kHz
2.5
fOSC = 200kHz
fOSC = 500kHz
VIN = 12V
2.0
Effective Open-Loop Resistance
vs Supply Voltage
90
80
70 fOSC = 200kHz
60
VOOpUeTraLtoioand(TMraOnDsEie=ntHB)urst Mode
VOUT
500mV/DIV
AC-COUPLED
1.5
50
40 fOSC = 500kHz
–5mA
IOUT
–50mA
1.0 30
0.5
0.0
0.1
1 10
OUTPUT CURRENT (mA)
20
10
0
100 0 5 10 15 20 25 30 35
SUPPLY VOLTAGE (V)
VIN = 12V
fOSC = 500kHz
2ms/DIV
3261 G11
3261 G09
3261 G10
(VMOUOTDTEra=nLsoiewntto High)
VOUT
500mV/DIV
AC-COUPLED
Average Input Current
vs Output Current
100
MODE = L
10
VOUT Ripple
VOUT
10mV/DIV
AC-COUPLED
MODE = L
MODE
MODE = H
VOUT
200mV/DIV
AC-COUPLED
1
MODE = H
VIN = 12V
fOSC = 500kHz
IOUT = –5mA
2ms/DIV
3261 G12
0.1
0.1
VIN = 12V
fOSC = 500kHz
1 10
OUTPUT CURRENT (mA)
100
3261 G13
VIN = 15V
fOSC = 500kHz
IOUT = 5mA
100µs/DIV
3261 G14
For more information www.linear.com/3261
3261fb
5
5 Page 
LTC3261
Typical Applications
High Voltage to Inverted Low Voltage Charge Pump
4.5V TO 32V
D1
MBR0540
C2
1µF
50V
D2
MBR0540
C3
1µF
50V
C1
4.7µF
50V
VIN
EN
C+
VOUT
LTC3261
D3
MBR0540
C– MODE
GND RT
VOUT
C4
4.7µF
50V
VOUT
–
VIN –Vf –
|IOUT |
2
•ROL
–Vf
3261 TA07
For more information www.linear.com/3261
3261fb
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LTC3261.PDF ] | |
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