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LTC3260IMSE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
LTC3260
1
3260fa
Typical applicaTion
FeaTures DescripTion
Low Noise Dual Supply
Inverting Charge Pump
The LT C
®
3260 is a low noise dual polarity output power
supply that includes an inverting charge pump with both
positive and negative LDO regulators. The charge pump
operates over a wide 4.5V to 32V input range and can deliver
up to 100mA of output current. Each LDO regulator can
provide up to 50mA of output current. The negative LDO
post regulator is powered from the charge pump output.
The LDO output voltages can be adjusted using external
resistor dividers.
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 LTC3260 draws only
100µA of quiescent current with both LDO regulators on.
In constant frequency mode the charge pump produces
an output equal to –V
IN
and operates at a fixed 500kHz
or to a programmed value between 50kHz to 500kHz us-
ing an external resistor. The LTC3260 is available in low
profile (0.75mm) 3mm x 4mm 14-pin DFN and thermally
enhanced 16-pin MSOP packages.
±12V Outputs from a Single 15V Input
LDO Rejection of V
OUT
Ripple
applicaTions
n
V
IN
Range: 4.5V to 32V
n
Inverting Charge Pump Generates –V
IN
n
Charge Pump Output Current Up to 100mA
n
Low Noise Negative LDO Post Regulator
(I
LDO
–
= 50mA Max)
n
Low Noise Independent Positive LDO Regulator
(I
LDO
+
= 50mA Max)
n
100µA Quiescent Current in Burst Mode
®
Operation
with Both LDO Regulators On
n
50kHz to 500kHz Programmable Oscillator Frequency
n
Stable with Ceramic Capacitors
n
Short-Circuit/Thermal Protection
n
Low Profile 3mm × 4mm 14-Pin DFN and Thermally
Enhanced 16-Pin MSOP Packages
n
Low Noise Bipolar/Inverting Supplies
n
Industrial/Instrumentation Low Noise Bias
Generators
n
Portable Medical Equipment
n
Portable Instruments
L, LT , LT C , LT M , 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.
10µF10µF
1µF
10nF
10nF
10µF10µF
909k
909k
200k
100k
100k
12V
–12V
3260 TA01a
LDO
+
15V
LDO
–
ADJ
+
LTC3260
RT
ADJ
–
GND
BYP
+
BYP
–
V
IN
V
OUT
–15V
EN
+
C
–
MODE
EN
–
C
+
V
LDO
+
10mV/DIV
AC-COUPLED
V
LDO
–
10mV/DIV
AC-COUPLED
V
OUT
10mV/DIV
AC-COUPLED
1µs/DIV
3260 TA01b
V
IN
= 15V
V
LDO
+
= 12V
V
LDO
–
= –12V
f
OSC
= 500kHz
I
LDO
+
= 50mA
I
LDO
–
–50mA
LTC3260
2
3260fa
absoluTe MaxiMuM raTings
V
IN
, EN
+
, EN
–
, MODE.. ............................... –0.3V to 36V
LDO
+
...........................................................–16V to 36V
V
OUT
, LDO
–
............................................... –36V to 0.3V
RT, ADJ
+
...................................................... –0.3V to 6V
BYP
+
......................................................... –0.3V to 2.5V
ADJ
–
............................................................ –6V to 0.3V
BYP
–
......................................................... –2.5V to 0.3V
(Notes 1, 3)
1
2
3
4
5
6
7
14
13
12
11
10
9
8
BYP
+
ADJ
+
MODE
EN
–
LDO
+
V
IN
C
+
EN
+
RT
BYP
–
ADJ
–
LDO
–
V
OUT
C
–
TOP VIEW
15
GND
DE PACKAGE
14-LEAD (4mm × 3mm) PLASTIC DFN
T
JMAX
= 150°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 15) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
5
6
7
8
EN
+
RT
BYP
–
ADJ
–
LDO
–
V
OUT
C
–
NC
16
15
14
13
12
11
10
9
BYP
+
ADJ
+
MODE
EN
–
LDO
+
V
IN
C
+
NC
TOP VIEW
MSE PACKAGE
16-LEAD PLASTIC MSOP
17
GND
T
JMAX
= 150°C, θ
JA
= 43°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
pin conFiguraTion
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3260EDE#PBF LTC3260EDE#TRPBF 3260
14-Lead (4mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3260IDE#PBF LTC3260IDE#TRPBF 3260
14-Lead (4mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3260EMSE#PBF LTC3260EMSE#TRPBF 3260 16-Lead Plastic MSOP –40°C to 125°C
LTC3260IMSE#PBF LTC3260IMSE#TRPBF 3260 16-Lead Plastic MSOP –40°C to 125°C
LTC3260HMSE#PBF LTC3260HMSE#TRPBF 3260 16-Lead Plastic MSOP –40°C to 150°C
LTC3260MPMSE#PBF LTC3260MPMSE#TRPBF 3260 16-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/
V
OUT
, LDO
+
, LDO
–
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)
MSE Only ..........................................................300°C
LTC3260
3
3260fa
elecTrical characTerisTics
The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T
A
= 25°C (Note 2). V
IN
= EN
+
= EN
–
= 12V, MODE = 0V, RT = 200kΩ.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
Charge Pump
V
IN
Input Voltage Range
l
4.5 32 V
V
UVLO
V
IN
Undervoltage Lockout Threshold V
IN
Rising
V
IN
Falling
l
l
3.4
3.8
3.6
4 V
V
I
VIN
V
IN
Quiescent Current Shutdown, EN
+
= EN
–
= 0V
EN
–
= 0V, I
LDO
+
= 0mA
MODE = V
IN
, EN
+
= 0V, I
VOUT
= I
LDO
–
= 0mA
MODE = V
IN
, I
VOUT
= I
LDO
+
= I
LDO
–
= 0mA
MODE = 0V, I
VOUT
= 0mA
2
30
80
100
3.5
5
50
160
200
5.5
µA
µA
µA
µA
mA
V
RT
RT Regulation Voltage 1.200 V
V
OUT
V
OUT
Regulation Voltage MODE = 12V
MODE = 0V
–0.94 • V
IN
–V
IN
V
V
f
OSC
Oscillator Frequency RT = GND 450 500 550 kHz
R
OUT
Charge Pump Output Impedance MODE = 0V, RT = GND 32 Ω
I
SHORT_CKT
Max I
VOUT
Short-Circuit Current V
OUT
= GND
l
100 160 250 mA
V
MODE(H)
MODE Threshold Rising
l
1.1 2.0 V
V
MODE(L)
MODE Threshold Falling
l
0.4 1.0 V
I
MODE
MODE Pin Internal Pull-Down Current V
IN
= MODE = 32V 0.7 µA
50mA Positive Regulator
LDO
+
Output Voltage Range
l
1.2 32 V
V
ADJ
+
ADJ
+
Reference Voltage
l
1.176 1.200 1.224 V
I
ADJ
+
ADJ+ Input Current V
ADJ
+
= 1.2V –50 50 nA
I
LDO
+
(SC)
LDO
+
Short-Circuit Current
l
50 100 mA
Line Regulation 0.04 mV/V
Load Regulation 0.03 mV/mA
V
DROPOUT
+
LDO
+
Dropout Voltage I
LDO
+
= 50mA 400 800 mV
Output Voltage Noise C
BYP
+
= 10nF 100 µV
RMS
V
EN
+
(H)
EN
+
Threshold Rising
l
1.1 2.0 V
V
EN
+
(L)
EN
+
Threshold Falling
l
0.4 1.0 V
I
EN
+
EN
+
Pin Internal Pull-Down Current V
IN
= EN
+
= 32V 0.7 µA
50mA Negative Regulator
LDO
–
Output Voltage Range
l
–32 –1.2 V
V
ADJ
–
ADJ
–
Reference Voltage
l
–1.224 –1.200 –1.176 V
I
ADJ
–
ADJ
–
Input Current V
ADJ
–
= –1.2V –50 50 nA
I
LDO
–
(SC)
LDO
–
Short-Circuit Current
l
50 100 mA
Line Regulation 0.002 mV/V
Load Regulation 0.02 mV/mA
V
DROPOUT
–
LDO
–
Dropout Voltage I
LDO
–
= 50mA 200 500 mV
Output Voltage Noise C
BYP
–
= 10nF 100 µV
RMS
V
EN(H)
EN
–
Threshold Rising
l
1.1 2.0 V
V
EN(L)
EN
–
Threshold Falling
l
0.4 1.0 V
I
EN
–
EN
–
Pin Internal Pull-Down Current V
IN
= EN
–
= 32V 1.4 µA
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

LTC3260IMSE#PBF

Mfr. #:
Buy LTC3260IMSE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Controllers Low Noise Dual Supply Inverting Charge Pump
Lifecycle:
New from this manufacturer.
Delivery:
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