Datasheet

LTC114 4
5
1144fa
For more information www.linear.com/LTC1144
Typical perForMance characTerisTics
Ripple Voltage vs Load Current Output Voltage vs Load Current Output Voltage vs Load Current
Power Conversion Efficiency and
Supply Current vs Load Current
Power Conversion Efficiency
vs Oscillator Frequency
Output Resistance
vs Oscillator Frequency
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.
V
OUT
(Pin 5): Output of the Converter.
SHDN (Pin 6): Shutdown Pin. Tie to V
+
pin or leave float-
ing for normal operation. Ti
e 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.
LOAD CURRENT (mA)
0
POWER CONVERSION EFFICIENCY (%)
SUPPLY CURRENT (mA)
60
80
100
16
LTC1144 • TPC10
40
20
0
30
40
50
20
10
0
4
8
12
20
P
EFF
I
S
T
A
= 25°C
V
+
= 5V
C1 = C2 = 10µF
BOOST = OPEN
(SEE TEST CIRCUIT)
LOAD CURRENT (mA)
0.01
0
RIPPLE VOLTAGE (mV)
500
1000
1µF
1µF
1500
0.1 1
LTC1144 • TPC13
10
100
0.1µF
10µF
10µF
V
+
= 5V
T
A
= 25°C
C1 = C2
BOOST = 5V
BOOST =
OPEN
0.1µF
OSCILLATOR FREQUENCY (kHz)
0.1
70
POWER CONVERSION EFFICIENCY (%)
90
95
100
1 10
100
LTC1144 • TPC11
85
80
75
T
A
= 25°C, V
+
= 15V
BOOST = OPEN
I
L
= 20mA
I
L
= 3mA
1µF
1µF
10µF
10µF
100µF
100µF
LOAD CURRENT (mA)
–4
OUTPUT VOLTAGE (V)
–3
–2
–1
0
0.001 0.1 1
100
LTC1144 • G14
–5
0.01
10
0.1µF
0.1µF 10µF
10µF
1µF
1µF
V
+
= 5V
T
A
= 25°C
C1 = C2
BOOST = 5V
BOOST = OPEN
OSCILLATOR FREQUENCY (kHz)
0.1
0
OUTPUT RESISTANCE (Ω)
2000
3000
1 10
100
LTC1144 • TPC12
1000
1µF10µF
100µF
T
A
= 25°C
V
+
= 15V
LOAD CURRENT (mA)
–10
OUTPUT VOLTAGE (V)
–5
0
0.001 0.1 1
100
LTC1144 • TPC15
–15
0.01
10
V
+
= 15V
T
A
= 25°C
C1 = C2
BOOST = 15V
0.1µF
0.1µF
1µF
1µF
10µF
10µF
BOOST = OPEN
pin FuncTions
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