LTC1144 查看數據表（PDF） - Linear Technology
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LTC1144 Datasheet PDF : 12 Pages
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Typical Performance Characteristics
LTC1144
Power Conversion Efficiency and
Supply Current vs Load Current
100
50
PEFF
80
40
60
30
40
20
IS
20
VTA+
=
=
25°C
5V
C1 = C2 = 10µF
10
BOOST = OPEN
(SEE TEST CIRCUIT)
0
0
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
IL = 20mA
70
0.1
1
10
100
OSCILLATOR FREQUENCY (kHz)
LTC1144 • TPC11
Output Resistance
vs Oscillator Frequency
3000
VTA+
=
=
25°C
15V
2000
10µF
1µF
1000
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
100
LOAD CURRENT (mA)
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
10 100
LOAD CURRENT (mA)
LTC1144 • G14
Output Voltage vs Load Current
0 V+ = 15V
TA = 25°C
C1 = C2
BOOST = 15V
BOOST = OPEN
–5
–10
–15
0.001
0.1µF
0.1µF 1µF
1µF
10µF
10µF
0.01 0.1
1
10 100
LOAD CURRENT (mA)
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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