LTC1144 Datasheet, PDF (4/8 Pages) Linear Technology – Switched-Capacitor Wide Input Range Voltage Converter with Shutdown

LTC1144
TYPICAL PERFORMANCE CHARACTERISTICS
Power Conversion Efficiency and
Supply Current vs Load Current
100
50
P_EFF
80
40
60
30
40
20
I_S
20
VT^A+
=
=
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
Ripple Voltage vs Load Current
1500
1000
V⁺ = 5V
T_A = 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
Power Conversion Efficiency
vs Oscillator Frequency
100
100µF
95 _100µF
10µF
90
T_A = 25°C, V⁺ = 15V
BOOST = OPEN
10µF
85
1µF
I_L = 3mA
80
1µF
75
I_L = 20mA
70
0.1
1
10
100
OSCILLATOR FREQUENCY (kHz)
LTC1144 • TPC11
Output Resistance
vs Oscillator Frequency
3000
VT^A+
=
=
25°C
15V
2000
10µF
1µF
1000
100µF
0
0.1
1
10
100
OSCILLATOR FREQUENCY (kHz)
LTC1144 • TPC12
Output Voltage vs Load Current
0
V⁺ = 5V
T_A = 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}
T_A = 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
PI FU CTIO S
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 floating
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.
4