Datasheet

3
LTC1707
Efficiency vs Input Voltage
INPUT VOLTAGE (V)
0
EFFICIENCY (%)
90
95
100
8
1707 G01
85
80
75
2
4
6
10
V
OUT
= 2.5V
L = 15µH
Burst Mode OPERATION
I
LOAD
= 100mA
I
LOAD
= 300mA
I
LOAD
= 10mA
OUTPUT CURRENT (mA)
1
70
65
60
55
50
EFFICIENCY (%)
90
95
100
10 100 1000
1707 G02
85
80
75
Burst Mode
OPERATION
PULSE SKIPPING
MODE
V
IN
= 3.6V
V
OUT
= 2.5V
L = 15µH
OUTPUT CURRENT (mA)
1
70
EFFICIENCY (%)
90
95
100
10 100 1000
1707 G03
85
80
75
V
OUT
= 2.5V
L = 15µH
Burst Mode OPERATION
V
IN
= 2.8V
V
IN
= 3.6V
V
IN
= 7.2V
Efficiency vs Load Current
Efficiency vs Load Current
Undervoltage Lockout Threshold
vs Temperature
TEMPERATURE (°C)
–50 –25
2.50
2.55
UNDERVOLTAGE LOCKOUT THRESHOLD (V)
2.60
2.70
2.75
2.80
75 100
3.00
1707 G04
2.65
0 25 50 125
2.85
2.90
2.95
V
IN
RAMPING UP
V
IN
RAMPING DOWN
DC Supply Current
vs Input Voltage
INPUT VOLTAGE (V)
2.5
DC SUPPLY CURRENT (µA)
50
100
150
6.5
350
1707 G05
0
4.5
3.5
7.5
5.5 8.5
200
250
300
T
J
= 25°C
V
OUT
= 1.8V
LOAD CURRENT = 0A
Burst Mode
OPERATION
PULSE SKIPPING
MODE
Supply Current in Shutdown
vs Input Voltage
INPUT VOLTAGE (V)
2.5
4
SUPPLY CURRENT IN SHUTDOWN (µA)
6
10
12
14
6.5
22
1707 G06
8
4.5
3.5
7.5
5.5 8.5
16
18
20
V
RUN/SS
= 0V
T
J
= 85°C
T
J
= 25°C
T
J
= –40°C
Reference Voltage
vs Temperature
Oscillator Frequency
vs Temperature
TEMPERATURE (°C)
–50 –25
1.180
REFERENCE VOLTAGE (V)
1.185
1.190
75 100
1.200
1707 G07
0 25 50 125
1.195
V
IN
= 5V
Oscillator Frequency
vs Input Voltage
TEMPERATURE (°C)
–50 –25
300
OSCILLATOR FREQUENCY (kHz)
310
330
340
350
75 100
390
1707 G08
320
0 25 50 125
360
370
380
V
IN
= 5V
INPUT VOLTAGE (V)
2.5
300
OSCILLATOR FREQUENCY (kHz)
310
330
340
350
6.5
390
1627 G09
320
4.5
3.5
7.5
5.5 8.5
360
370
380
TYPICAL PERFOR A CE CHARACTERISTICS
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