LTC3424_15 Datasheet, PDF (4/12 Pages) Linear Technology – Low Output Voltage, 3MHz Micropower Synchronous Boost Converters

LTC3423/LTC3424
TYPICAL PERFOR A CE CHARACTERISTICS
Converter Efficiency 1.2V to 1.8V
100
90
Burst Mode
80 _OPERATION
70
300MHz
3MHz
60
1MHz
50
40
30
20
10
0
0.1
WITH MBRM120T3 SCHOTTKY
1
10
100
OUTPUT CURRENT (mA)
1000
3223/24 G05
EA FB Voltage
1.28
1.27
1.26
1.25
1.24
1.23
LTC3424 Current Limit
3.4
3.2
3.0
2.8
2.6
2.4
2.2
2.0
–55
–15
25
65
TEMPERATURE (°C)
105 125
3423/24 G06
Oscillator Frequency Accuracy
2.10 _{RT = 15k}
2.05
2.00
1.95
LTC3423 Current Limit
1.80
1.75
1.70
1.65
1.60
1.55
1.50
1.45
1.40
–55
–15
25
65
TEMPERATURE (°C)
NMOS R_DS(ON)
0.30 _{VOUT = 1.8V}
V_DD = 3.3V
0.25
105 125
3423/24 G07
0.20
0.15
0.10
1.22
–55
–15
25
65
TEMPERATURE (°C)
105 125
3423/24 G08
1.90
–55
–15
25
65
TEMPERATURE (°C)
105 125
3423/24 G09
0.05
–55
–15
25
65
TEMPERATURE (°C)
PMOS R_DS(ON)
0.40
V_OUT = 1.8V
V_DD = 3.3V
0.35
0.30
Efficiency Loss Without Schottky
vs Frequency
14
T_A = 25°C
12
10
8
0.25
6
4
0.20
2
0.15
–55
–15
25
65
TEMPERATURE (°C)
105 125
3423/24 G11
0
0.2 0.6
1.0 1.4 1.8 2.2
FREQUENCY (MHz)
2.6 3.0
3423/24 G12
105 125
3423/24 G10
34234f
4