Datasheet

3
LTC660
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
(Using Test Circuit in Figure 1)
Output Voltage and Efficiency
vs Load Current, V
+
= 5V
LOAD CURRENT (mA)
0
OUTPUT VOLTAGE (V)
EFFICIENCY (%)
–3.8
–3.4
–3.0
80
LTC660 • TPC06
–4.2
–4.6
–5.0
84
92
100
76
68
80
88
96
72
64
60
20 40 6010 9030 50 70 100
LTC660
EFFICIENCY
LTC660
OUTPUT VOLTAGE
T
A
= 25°C
BOOST = OPEN
OSCILLATOR FREQUENCY (kHz)
0.1
40
OUTPUT RESISTANCE (Ω)
50
60
70
80
1 10 100
LTC660 • TPC03
30
20
10
0
90
100
C1 = C2 = 22µF
C1 = C2 = 150µF
C1 = C2 = 1500µF
T
A
= 25°C
V
+
= 5V
BOOST = OPEN
Output Resistance
vs Oscillator Frequency
LOAD CURRENT (mA)
0
EFFICIENCY (%)
90
100
80
LTC660 • TPC07
80
70
85
95
75
65
60
20
40
60
10 90
30
50
70
100
V
+
= 5.5V
T
A
= 25°C
BOOST = OPEN
V
+
= 4.5V
V
+
= 3.5V
V
+
= 2.5VV
+
= 1.5V
Efficiency vs Load Current
SUPPLY VOLTAGE (V)
0
0
OUTPUT RESISTANCE (Ω)
2
6
8
10
2
18
LTC690 • TPC04

4
13456
12
14
16
T
A
= 25°C
BOOST = OPEN
Output Resistance
vs Supply Voltage
TEMPERATURE (°C)
–60
OUTPUT RESISTANCE (Ω)
15
20
25
100
LTC660 • TPC05

10
5
0
–20
20
60
140
80
–40
0
40
120
V
+
= 1.5V
BOOST = OPEN
V
+
= 3V
V
+
= 5V
Output Resistance vs Temperature
Output Voltage Drop
vs Load Current
LOAD CURRENT (mA)
0
OUTPUT VOLTAGE DROP FROM
SUPPLY VOLTAGE (V)
0.8
1.0
80
LTC660 • TPC09
0.6
0.4
0.7
0.9
0.5
0.3
0.2
0.1
0
20
40
60
10 90
30
50
70
100
V
+
= 5.5V
T
A
= 25°C
BOOST = OPEN
V
+
= 2.5V
V
+
= 1.5V
V
+
= 3.5V
V
+
= 4.5V
Efficiency vs Load Current
LOAD CURRENT (mA)
0
EFFICIENCY (%)
90
100
80
LTC660 • TPC08
80
70
85
95
75
65
60
20
40
60
10 90
30
50
70
100
V
+
= 5.5V
T
A
= 25°C
BOOST = V
+
V
+
= 3.5V
V
+
= 2.5V
V
+
= 1.5V
V
+
= 4.5V
SUPPLY VOLTAGE (V)
1.5
0
SUPPLY CURRENT (µA)
50
100
150
200
2.5 3.5
4.5
5.5
LTC660 • G01
250
300
23
4
5
BOOST = V
+
BOOST = OPEN
T
A
= 25°C
Supply Current vs Supply Voltage
OSCILLATOR FREQUENCY (kHz)
10
100
SUPPLY CURRENT (µA)
1000
0.01 1 10 1000
LTC660 • G02
1
0.1
100
T
A
= 25°C
V
+
= 5V
Supply Current
vs Oscillator Frequency