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LTC3265

Description
low noise dual supply with boost and inverting charge pumps
Categorysemiconductor    Power management   
File Size799KB,20 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
Download Datasheet View All

LTC3265 Overview

low noise dual supply with boost and inverting charge pumps

FEATURES
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LTC3265
Low Noise Dual Supply
with Boost and Inverting
Charge Pumps
DESCRIPTION
The
LTC
®
3265
is a low noise dual polarity output power
supply including a boost charge pump, an inverting charge
pump and two low noise positive and negative LDO post
regulators. The boost charge pump powers the positive
LDO post regulator while the inverting charge pump pow-
ers the negative LDO regulator. Each LDO can provide up
to 50mA of output current. The LDO output voltages can
be adjusted using external resistor dividers.
The charge pumps employ low quiescent current
Burst Mode operation or low noise constant frequency
mode. During Burst Mode operation, the boost charge
pump regulates its output (V
OUT+
) to 0.94 • 2 • V
IN_P
while
the inverting charge pump regulates its output (V
OUT–
)
to –0.94 • V
IN_N
. In Burst Mode operation the LTC3265
draws only 135µA of quiescent current with both LDOs
on. In constant frequency mode, the boost and inverting
charge pumps produce outputs equal to 2 • V
IN_P
and
–V
IN_N
respectively and operate at a fixed 500kHz or to
a programmed value between 50kHz to 500kHz using an
external resistor. The LTC3265 is available in low profile
3mm
×
5mm
×
0.75mm 18-lead DFN and thermally
enhanced 20-lead TSSOP packages.
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Boost Charge Pump Generates 2 • V
IN_P
(V
IN_P
Range: 4.5V to 16V)
Inverting Charge Pump Generates –V
IN_N
(V
IN_N
Range: 4.5V to 32V)
Low Noise Positive LDO Post Regulator Up to 50mA
Low Noise Negative LDO Post Regulator Up to 50mA
135µA Quiescent Current in Burst Mode
®
Operation
with Both LDO Regulators On
50kHz to 500kHz Programmable Oscillator Frequency
Stable with Ceramic Capacitors
Short-Circuit/Thermal Protection
Low Profile 3mm
×
5mm 18-Lead DFN and Thermally
Enhanced 20-Lead TSSOP Packages
APPLICATIONS
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Low Noise Bipolar/Inverting Supplies
Industrial/Instrumentation Low Noise Bias Generators
L,
LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
TYPICAL APPLICATION
Low Noise ±15V Outputs from a Single 12V Input
1µF
LDO Rejection of V
OUT ±
Ripple
V
OUT+
10mV/DIV
AC-COUPLED
CBST
+
CBST
V
OUT+
V
IN_N
LDO
+
LTC3265
EN
+
EN
MODE
1µF
CINV
+
CINV
V
OUT
10µF
+15V
10µF
604K
52.3k
12V
10µF
V
IN_P
ADJ
+
BYP
+
GND
BYP
ADJ
V
LDO+
10mV/DIV
AC-COUPLED
V
LDO–
10mV/DIV
AC-COUPLED
V
OUT–
10mV/DIV
AC-COUPLED
1µs/DIV
3265 TA01b
100nF
100nF
52.3k
604K
10µF
LDO
RT
10µF
3265 TA01a
–15V
V
IN_P
= 12V, V
IN_N
= V
OUT+
V
LDO+
= 15V
V
LDO–
= –15V
f
OSC
= 500kHz
I
LDO+
= 20mA
I
LDO–
= –20mA
For more information
www.linear.com/LTC3265
1
3265f

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