Datasheet

LTC3549
5
3549f
INPUT VOLTAGE (V)
1.5
OSCILLATOR FREQUENCY SHIFT (%)
0.5
1.0
1.5
5.5
3549 G08
0
–0.5
–1.5
2.5
3.5
4.5
–1.0
2.5
2.0
2.05
2.15
2.25
2.35
2.10
2.20
2.30
TEMPERATURE (°C)
–50
OSCILLATOR FREQUENCY (MHz)
–25 0 25 50
3549 G07
75 100 125
V
IN
= 2.7V
V
IN
= 1.6V
V
IN
= 4.2V
LOAD CURRENT (mA)
0
OUTPUT VOLTAGE (V)
1.203
1.204
300
3549 G09
1.202
1.201
1.199
100
200
1.200
1.205
V
OUT
PULSE SKIP
BURST
Oscillator Frequency
vs Temperature
Oscillator Frequency Shift
vs Input Voltage
Output Voltage vs Load Current
V
IN
= 1.6V, V
OUT
= 1.2V
R
DS(ON)
vs Input Voltage R
DS(ON)
vs Temperature
Dynamic Input Current
V
OUT
= 1.5V, 247kΩ Load
Dynamic Supply Current vs
Temperature, V
IN
= 3.6V,
V
OUT
= 1.5V, No Load
Switch Leakage vs Temperature
V
IN
= 5.5V Switch Leakage vs Input Voltage
TYPICAL PERFOR A CE CHARACTERISTICS
UW
(From Typical Application on the front page, except for the resistive divider resistor values)
INPUT VOLTAGE (V)
1.5
R
DS(ON)
(Ω)
0.4
0.5
0.6
5.5
3549 G10
0.3
0.2
0
2.5
3.5
4.5
0.1
0.9
0.8
0.7
MAIN SWITCH
SYNCHRONOUS SWITCH
TEMPERATURE (°C)
–50
R
DS(ON)
(Ω)
–25 0 25 50
3549 G11
75 100 125
0.15
0.25
0.35
0.45
0.65
0.85
0.95
0.75
0.55
V
IN
= 1.6V
V
IN
= 2.7V
V
IN
= 4.2V
V
IN
= 1.6V
V
IN
= 2.7V
V
IN
= 4.2V
MAIN SWITCH SYNCHRONOUS SWITCH
TEMPERATURE (°C)
–50
DYNAMIC SUPPLY CURRENT (µA)
–25 0 25 50
3549 G13
75 100 125
50
0
150
250
350
100
200
300
PULSE SKIP
BURST
SYNCHRONOUS SWITCH
TEMPERATURE (°C)
–50
SWITCH LEAKAGE (nA)
–25 0 25 50
3549 G14
75 100 125
50
0
150
250
100
200
MAIN SWITCH
INPUT VOLTAGE (V)
0
SWITCH LEAKAGE (nA)
0.8
1.0
1.2
3549 G15
0.6
0.4
0
2
4
6
0.2
1.6
1.4
MAIN SWITCH
SYNCHRONOUS
SWITCH
INPUT VOLTAGE (V)
2.0
DYNAMIC SUPPLY CURRENT—PULSE SKIP (µA)
DYNAMIC SUPPLY CURRENT—BURST MODE (µA)
3.0
10000 70
60
50
40
30
20
10
0
3549 G12
100
1000
2.5
6.0
5.55.04.5
4.0
3.5
1.5
Burst Mode
OPERATION
PULSE SKIP MODE