Datasheet

LTC1700
4
1700fa
TEMPERATURE (°C)
–55 –35 –15 5 45 85 125
START-UP CURRENT LIMIT (A)
25
0.16
0.14
0.12
0.10
0.08
0.06
0.04
0.02
0
1700 G8
10565
TEMPERATURE (°C)
–55 –35 –15 5 45 85 125
SENSE VOLTAGE (mV)
25
90
80
70
60
1700 G7
10565
TEMPERATURE (°C)
–55 –35 –15 5 45 85 125
NORMALIZED FREQUENCY
25
1.08
1.06
1.04
1.02
1.00
0.98
0.96
0.94
1700 G5
10565
RUN/SS Current vs Temperature
Normalized Oscillator Frequency
vs Temperature
Minimum Operating Voltage
vs Temperature
Maximum Current Sense Voltage
vs Temperature
Start-Up Current Limit vs
Temperature
Efficiency vs Load Current
(Burst Mode Operation Disabled)
3.3V Output Efficiency, Circuit of
Figure 1 with Burst Mode
Operation
3.3V Output Efficiency, Circuit of
Figure 1 with Burst Mode
Operation Inhibited
Load Step Transient Response
Burst Mode Operation Enabled
TYPICAL PERFORMANCE CHARACTERISTICS
UW
V
IN
= 3.3V
V
OUT
= 5V
2A/DIV
V
SYNC
= V
IN
LOAD STEP = 100mA TO 1.7A
A/C COUPLED
OUTPUT
VOLTAGE
(0.2V/DIV)
INDUCTOR
CURRENT
(2A/DIV)
1700 G12
TEMPERATURE (°C)
–55
RUN/SS CURRENT (µA)
6
5
4
3
2
1
0
–15
25
45 125
1700 G04
–35 5
65
85
105
LOAD CURRENT (A)
EFFICIENCY (%)
100
90
80
70
60
50
40
30
0.001 0.1 1.0
1700 G10
0.01
V
IN
= 2.7V
V
IN
= 2V
LOAD CURRENT (A)
EFFICIENCY (%)
100
90
80
70
60
50
40
30
0.001 0.1 1.0
1700 F16
0.01
V
IN
= 2.7V
V
IN
= 2V
LOAD CURRENT (A)
EFFICIENCY (%)
100
90
80
70
60
50
40
0.001 0.1 1.0
1700 G09
0.01
V
IN
= 4.2V
V
IN
= 3.3V
TEMPERATURE (°C)
–55 –35 –15 5 45 85 125
START-UP VOLTAGE (V)
25
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1700 G6
10565
START-UP
CIRCUIT
START-UP VOLTAGE (V)
2.28
2.26
2.24
2.22
2.20
2.18
2.16
2.14
MAIN
CONTROLLER