LTC3426 Datasheet, PDF (3/12 Pages) Linear Technology – 1.2MHz Step-Up DC/DC Converter in SOT-23

TYPICAL PERFOR A CE CHARACTERISTICS
LTC3426
Oscillator Frequency
vs Temperature
1.40
1.3
1.2
1.1
1.0
–50 –30 –10 10 30 50 70 90
TEMPERATURE (°C)
3426 G01
Efficiency vs V_IN
100
FIGURE 1 CIRCUIT
98 T_A = 25°C
96
I_LOAD = 150mA
V_OUT = 5V
94 ^COUT ^{= 22µF}
L = 2.2µH
92
90
88
86
84
82
80
1.8 2.2 2.6 3 3.4
V_IN (V)
3.8 4.2
LT1108 • TPC12
I_OUT(MAX) vs V_IN
1.3
FIGURE 1 CIRCUIT
T_A = 25°C
1.1
V_OUT = 5V
C_OUT = 22µF
L = 2.2µH
0.9
0.7
0.5
0.3
1.8 2.2 2.6 3 3.4
V_IN (V)
3.8 4.2
3426 G03
R_DS(ON) vs Temperature
0.15
0.14
0.13
0.12
V_OUT = 2.5V
0.11
0.10
V_OUT = 5V
0.09
V_OUT = 3.3V
0.08
0.07
0.06
0.05
–50 –25 0
25 50
75 100
TEMPERATURE (°C)
3426 G04
FB Pin Voltage
1.25
1.24
Switching Waveforms
V_OUT
500mV/DIV
1.23
SW
2V/DIV
1.22
1.21
I_L
200mA/DIV
1.20
1.19
–50 –25 0
25 50
TEMPERATURE (°C)
75 100
3426 G05
V_IN = 1.8V
V_OUT = 3.3V
C_OUT = 22µF
L = 2.5µH
100ns/DIV
3426 G06
SW Pin Antiringing Operation
V_OUT Transient Response
SW
1V/DIV
V_OUT
500mV/DIV
I_OUT
200mA/DIV
250mA
500mA
I_L
50mA/DIV
V_IN = 1.8V
V_OUT = 3.3V
100ns/DIV
3426 G07
I_L
500mA/DIV
V_IN = 1.8V
V_OUT = 3.3V
C_OUT = 22µF
L = 2.5µH
40µs/DIV
3426 G08
3426f
3