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PDF LTC1144 Data sheet ( Hoja de datos )
| Número de pieza | LTC1144 | |
| Descripción | Switched-Capacitor Wide Input Range Voltage Converter with Shutdown | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Features
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
Applications
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
LTC1144
Switched-Capacitor
Wide Input Range
Voltage Converter
with Shutdown
Description
The LTC®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.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
Typical Application
+
10µF
Generating –15V from 15V
LTC1144
1 BOOST
V+ 8 15V INPUT
2 CAP+
OSC 7
3 GND SHDN 6
4 CAP–
VOUT 5
–15V OUTPUT
10µF
1144 TA01
Output Voltage vs Load Current, V+ = 15V
–15
ROUT = 56Ω
TA = 25°C
–14
–13
–12
–11
–10
0
10 20 30 40 50
LOAD CURRENT (mA)
1144 TA02
For more information www.linear.com/LTC1144
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1 page  
Typical Performance Characteristics
LTC1144
Power Conversion Efficiency and
Supply Current vs Load Current
100 50
80 PEFF
40
60 30
40 IS
20
20
VTA+
=
=
25°C
5V
C1 = C2 = 10µF
10
BOOST = OPEN
(SEE TEST CIRCUIT)
00
0 4 8 12 16 20
LOAD CURRENT (mA)
LTC1144 • TPC10
Power Conversion Efficiency
vs Oscillator Frequency
100
100µF
95 100µF
10µF
90
TA = 25°C, V+ = 15V
BOOST = OPEN
10µF
85
1µF IL = 3mA
80
1µF
75
70
0.1
IL = 20mA
1 10
OSCILLATOR FREQUENCY (kHz)
100
LTC1144 • TPC11
Output Resistance
vs Oscillator Frequency
3000
VTA+
=
=
25°C
15V
2000
10µF
1000
1µF
100µF
0
0.1 1 10 100
OSCILLATOR FREQUENCY (kHz)
LTC1144 • TPC12
Ripple Voltage vs Load Current
1500
1000
V+ = 5V
TA = 25°C
C1 = C2
BOOST = 5V
BOOST =
1µF
OPEN
0.1µF
0.1µF
10µF
500
1µF
0
0.01
10µF
0.1 1 10
LOAD CURRENT (mA)
100
LTC1144 • TPC13
Output Voltage vs Load Current
0 V+ = 5V
TA = 25°C
–1
C1 = C2
BOOST = 5V
BOOST = OPEN
–2
0.1µF
–3
0.1µF 10µF
1µF
1µF
10µF
–4
–5
0.001
0.01 0.1
1
10
LOAD CURRENT (mA)
100
LTC1144 • G14
Output Voltage vs Load Current
0 V+ = 15V
TA = 25°C
C1 = C2
BOOST = 15V
–5 BOOST = OPEN
–10
–15
0.001
0.1µF
0.1µF 1µF
1µF
10µF
10µF
0.01 0.1
1
10
LOAD CURRENT (mA)
100
LTC1144 • TPC15
Pin Functions
Boost (Pin 1): This pin will raise the oscillator frequency
by a factor of 10 if tied high.
CAP+ (Pin 2): Positive Terminal for Pump Capacitor.
GND (Pin 3): Ground Reference.
CAP– (Pin 4): Negative Terminal for Pump Capacitor.
VOUT (Pin 5): Output of the Converter.
SHDN (Pin 6): Shutdown Pin. Tie to V+ pin or leave float-
ing for normal operation. Tie to ground when in shutdown
mode.
OSC (Pin 7): Oscillator Input Pin. This pin can be overdriven
with an external clock or can be slowed down by connect-
ing an external capacitor between this pin and ground.
V+ (Pin 8): Input Voltage.
For more information www.linear.com/LTC1144
1144fa
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Revision History
REV DATE DESCRIPTION
A 04/14 Change 0.0002% to 0.002% under the Ultra-Precision Voltage Divider section.
LTC1144
PAGE NUMBER
8
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconneFcotiornmoof irtseciinrcfouirtms aastdioenscwribwedwh.leinreeinarw.cilol nmot/LinTfCrin1g1e4o4n existing patent rights.
1144fa
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC1144.PDF ] | |
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