LTC3260
Low Noise Dual Supply
Inverting Charge Pump
Fea T Descrip T
n
V Range: 4.5V to 32V
The LTC 3260 is a low noise dual polarity output power
IN
n
Inverting Charge Pump Generates V
supply that includes an inverting charge pump with both
IN
n
Charge Pump Output Current Up to 100mA
positive and negative LDO regulators. The charge pump
n
Low Noise Negative LDO Post Regulator
operates over a wide 4.5V to 32V input range and can deliver
(I = 50mA Max)
up to 100mA of output current. Each LDO regulator can
LDO
n
Low Noise Independent Positive LDO Regulator
provide up to 50mA of output current. The negative LDO
+
(I = 50mA Max)
post regulator is powered from the charge pump output.
LDO
n
100A Quiescent Current in Burst Mode Operation
The LDO output voltages can be adjusted using external
with Both LDO Regulators On
resistor dividers.
n
50kHz to 500kHz Programmable Oscillator Frequency
The charge pump employs either low quiescent current
n
Stable with Ceramic Capacitors
Burst Mode operation or low noise constant frequency
n
Short-Circuit/Thermal Protection
mode. In Burst Mode operation the charge pump V
OUT
n
Low Profile 3mm 4mm 14-Pin DFN and Thermally
regulates to 0.94 V , and the LTC3260 draws only
IN
Enhanced 16-Pin MSOP Packages
100A of quiescent current with both LDO regulators on.
In constant frequency mode the charge pump produces
an output equal to V and operates at a fixed 500kHz
a T
IN
or to a programmed value between 50kHz to 500kHz us-
n
Low Noise Bipolar/Inverting Supplies
ing an external resistor. The LTC3260 is available in low
n
Industrial/Instrumentation Low Noise Bias
profile (0.75mm) 3mm x 4mm 14-pin DFN and thermally
Generators
enhanced 16-pin MSOP packages.
n
Portable Medical Equipment
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
n
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
Portable Instruments
property of their respective owners.
Typical a T
LDO Rejection of V Ripple
OUT
12V Outputs from a Single 15V Input
+
+
V
15V V LDO 12V
LDO
IN
10mV/DIV
10F 10F
909k
LTC3260
AC-COUPLED
+ +
EN ADJ
V
LDO
+
10mV/DIV
EN BYP
100k
10nF
AC-COUPLED
MODE GND
V
OUT
10nF
+ 10mV/DIV
100k
C BYP
1F AC-COUPLED
C ADJ
909k
3260 TA01b
V = 15V 1s/DIV
IN
12V +
15V V LDO
OUT
V = 12V
LDO
10F 10F
RT V = 12V
LDO
3260 TA01a f = 500kHz
OSC
+
200k I = 50mA
LDO
I 50mA
LDO
3260fa
1
ion pplica
ions pplica
ion uresLTC3260
a T e Maxi Mu M r a T (Notes 1, 3)
+ +
V , EN , EN , MODE.. ............................... 0.3V to 36V V , LDO , LDO Short-Circuit Duration ........ Indefinite
IN OUT
+
LDO ...........................................................16V to 36V Operating Junction Temperature Range
V , LDO ............................................... 36V to 0.3V (Note 2) .................................................. 55C to 150C
OUT
+
RT, ADJ ...................................................... 0.3V to 6V Storage Temperature Range ................. 65C to 150C
+
BYP ......................................................... 0.3V to 2.5V Lead Temperature (Soldering, 10 sec)
ADJ ............................................................ 6V to 0.3V MSE Only ..........................................................300C
BYP ......................................................... 2.5V to 0.3V
p c F T
TOP VIEW
TOP VIEW
+ +
EN 1 14 BYP
+ +
+ EN 1 16 BYP
RT 2 13 ADJ
+
RT 2 15 ADJ
BYP 3 12 MODE
BYP 3 14 MODE
15 ADJ 4 17 13 EN
ADJ 4 11 EN
+
GND LDO 5 GND 12 LDO
+
LDO 5 10 LDO V 6 11 V
OUT IN
+
C 7 10 C
V 6 9 V
OUT IN
NC 8 9 NC
+
C 7 8 C
MSE PACKAGE
16-LEAD PLASTIC MSOP
DE PACKAGE
T = 150C, = 43C/W
JMAX JA
14-LEAD (4mm 3mm) PLASTIC DFN
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
T = 150C, = 43C/W
JMAX JA
EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB
o r D i n F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3260EDE#PBF LTC3260EDE#TRPBF 3260 14-Lead (4mm 3mm) Plastic DFN 40C to 125C
LTC3260IDE#PBF LTC3260IDE#TRPBF 3260 14-Lead (4mm 3mm) Plastic DFN 40C to 125C
LTC3260EMSE#PBF LTC3260EMSE#TRPBF 3260 16-Lead Plastic MSOP 40C to 125C
LTC3260IMSE#PBF LTC3260IMSE#TRPBF 3260 16-Lead Plastic MSOP 40C to 125C
LTC3260HMSE#PBF LTC3260HMSE#TRPBF 3260 16-Lead Plastic MSOP 40C to 150C
LTC3260MPMSE#PBF LTC3260MPMSE#TRPBF 3260 16-Lead Plastic MSOP 55C to 150C
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: