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LTC1144CN8#PBF

P1-P3P4-P6P7-P9P10-P12
LTC114 4
1
1144fa
For more information www.linear.com/LTC1144
Typical applicaTion
FeaTures DescripTion
Switched-Capacitor
Wide Input Range
Voltage Converter
with Shutdown
The LT C
®
1144 is a monolithic CMOS switched-capacitor
voltage converter. It performs supply voltage conversion
from positive to negative from an input range of 2V to
18V, resulting in complementary output voltages of –2V to
–18V. Only two noncritical external capacitors are needed
for the charge pump and charge reservoir functions.
The converter has an internal oscillator that can be
overdriven by an external clock or slowed down when
connected to a capacitor. The oscillator runs at a 10kHz
frequency when unloaded. A higher frequency outside the
audio band can also be obtained if the Boost Pin is tied to
V
+
. The SHDN pin reduces supply current to 8µA and can
be used to save power when the converter is not in use.
The LTC1144 contains an internal oscillator, divide-by- two,
voltage level shifter, and four power MOSFETs. A special
logic circuit will prevent the power N-channel switch
substrate from turning on.
applicaTions
n
Wide Operating Supply Voltage Range: 2V to 18V
n
Boost Pin (Pin 1) for Higher Switching Frequency
n
Simple Conversion of 15V to –15V Supply
n
Low Output Resistance: 120Ω Maximum
n
Power Shutdown to 8µA with SHDN Pin
n
Open Circuit Voltage Conversion Efficiency:
99.9% Typical
n
Power Conversion Efficiency: 93% Typical
n
Easy to Use
n
Conversion of 15V to ±15V Supplies
n
Inexpensive Negative Supplies
n
Data Acquisition Systems
n
High Voltage Upgrade to LTC1044 or 7660
n
Voltage Division and Multiplications
n
Automotive Applications
n
Battery Systems with Wall Adapter/Charger
L, LT , LT C, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Output Voltage vs Load Current, V
+
= 15VGenerating –15V from 15V
1
2
3
4
8
7
6
5
BOOST
CAP
+
GND
CAP
–
V
+
OSC
SHDN
V
OUT
+
+
10µF
–
15V OUTPUT
15V INPUT
LTC1144
10µF
1144 TA01
LOAD CURRENT (mA)
0 10
OUTPUT VOLTAGE (V)
–15
–14
–13
–12
–11
–10
40
1144 TA02
20
30
50
R
OUT
= 56Ω
T
A
= 25°C
LTC114 4
2
1144fa
For more information www.linear.com/LTC1144
absoluTe MaxiMuM raTings
Supply Voltage (V
+
) (Transient) ...............................20V
Supply Voltage (V
+
) (Operating) .............................. 18V
Input Voltage on Pins 1, 6, 7
(No
te 2)
............................ –0.3V < V
IN
< (V
+
) + 0.3V
Output Short-Circuit Duration
V
+
≤ 10V ..................................................... Indefinite
V
+
≤ 15V .......................................................... 30 sec
V
+
≤ 20V ............................................. Not Protected
Power Dissipation ............................................. 500mW
Operating Temperature Range
LTC1144C
................................................. 0°C to 70°C
LTC1144I
..............................................–40°C to 85°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec) ................... 300°C
(Note 1)
orDer inForMaTion
LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC1144CN8#PBF LTC1144CN8#TRPBF LTC1144CN8 8-Lead Plastic DIP 0°C to 70°C
LTC1144IN8#PBF LTC1144IN8#TRPBF LTC1144IN8 8-Lead Plastic DIP –40°C to 85°C
LTC1144CS8#PBF LTC1144CS8#TRPBF 1144 8-Lead Plastic SOIC 0°C to 70°C
LTC1144IS8#PBF LTC1144IS8#TRPBF 1144I 8-Lead Plastic SOIC –40°C to 85°C
Consult LT C Marketing for parts specified with wider operating temperature ranges.
Consult LT C
Marketing for information on nonstandard 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/
1
2
3
4
8
7
6
5
TOP VIEW
BOOST
CAP
+
GND
CAP
–
V
+
OSC
SHDN
V
OUT
N8 PACKAGE
8-LEAD PLASTIC DIP
T
JMAX
= 110°C, θ
JA
= 100°C/W
TOP VIEW
1
2
3
4
8
7
6
5
BOOST
CAP
+
GND
CAP
–
V
+
OSC
SHDN
V
OUT
S8 PACKAGE
8-LEAD PLASTIC SOIC
T
JMAX
= 110°C, θ
JA
= 130°C/W
pin conFiguraTion
LTC114 4
3
1144fa
For more information www.linear.com/LTC1144
elecTrical characTerisTics
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: Connecting any input terminal to voltages greater than V
+
or less
than ground may cause destructive latch-up. It is recommended that no
inputs from sources operating from external supplies be applied prior to
power-up of the LTC1144.
Note 3: f
OSC
is tested with C
OSC
= 100pF to minimize the effects of test
fixture capacitance loading. The 0pF frequency is correlated to this 100pF
test point, and is intended to simulate the capacitance at pin 7 when the
device is plugged into a test socket and no external capacitor is used.
SYMBOL PARAMETER CONDITIONS
LTC1144C LTC1144I
UNITSMIN TYP MAX MIN TYP MAX
Supply Voltage Range R
L
= 10k
l
2 18 2 18 V
I
S
Supply Current R
L
= ∞, Pins 1, 6 No Connection,
f
OSC
= 10kHz
l
1.1
1.3
1.1
1.6
mA
mA
SHDN = 0V, R
L
= ∞, Pins 1, 7
No Connection
l
0.008 0.03 0.008 0.035 mA
V
+
= 5V, R
L
= ∞, Pins 1, 6
No Connection, f
OSC
= 4kHz
l
0.10
0.13
0.10
0.15
mA
mA
V
+
= 5V, SHDN = 0V, R
L
= ∞,
Pins 1, 7 No Connection
l
0.002 0.015 0.002 0.018 mA
R
OUT
Output Resistance V
+
= 15V, I
L
= 20mA at 10kHz
l
56 100
120
56 100
140
Ω
Ω
V
+
= 5V, I
L
= 3mA at 4kHz
l
90 250 90 300 Ω
f
OSC
Oscillator Frequency V
+
= 15V (Note 3)
V
+
= 5V
10
4
10
4
kHz
kHz
Power Efficiency R
L
= 2k at 10kHz
l
90 93 90 93 %
Voltage Conversion Efficiency R
L
= ∞
l
97.0 99.9 97.0 99.9 %
Oscillator Sink or Source Current V
+
= 5V (V
OSC
= 0V to 5V)
V
+
= 15V (V
OSC
= 0V to 15V)
0.5
4
0.5
4
µA
µA
The l denotes the specifications which apply over the full operating
temperature range,V
+
= 15V, C
OSC
= 0pF, Test Circuit Figure 1, otherwise specifications are at T
A
= 25°C.
P1-P3P4-P6P7-P9P10-P12

LTC1144CN8#PBF

Mfr. #:
Buy LTC1144CN8#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Switched Cap Volt Conv 20V
Lifecycle:
New from this manufacturer.
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