LTC3458_15 Datasheet, PDF (4/16 Pages) Linear Technology – 1.4A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect

LTC3458
TYPICAL PERFOR A CE CHARACTERISTICS (T_A = 25°C unless otherwise specified)
Frequency Accuracy
1.05
RT = 200k
1.03
1.01
0.99
0.97
0.95
–45 –30 –15 0 15 30 45 60 75 90
TEMPERATURE (°C)
3458 G07
Maximum Load Current
1200
1000
1.8 to 5.5V_IN at 700kHz
R_ILIM = 124k
5V_OUT
800
3.3V_OUT
600
7.5V_OUT
400
200
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3458 G10
Efficiency vs Frequency
95
V_IN = 3.3V
V_OUT = 5V at 100mA
93
91
89
87
85
500
700 900 1100 1300 1500
FREQUENCY (kHz)
3458 G08
SHDN Pin Threshold and
Hysteresis
1.0
0.9
OPERATING
0.8
0.7
SHUTDOWN
0.6
0.5
–45 –30 –15 0 15 30 45 60
TEMPERATURE (°C)
75 90
3458 G11
N-Channel and P-Channel R_DS(ON)
0.5
V_IN = 3.3V
V_OUT = 5V
0.4
P-CHANNEL
0.3
N-CHANNEL
0.2
0.1
0
–40 –15 10
35
60
85
TEMPERATURE (°C)
3458 G09
SYNC Pin Threshold
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
–45 –30 –15 0 15 30 45 60
TEMPERATURE (°C)
75 90
3458 G12
FB Voltage
1.25
1.24
1.23
1.22
1.21
1.20
–45 –30 –15 0 15 30 45 60
TEMPERATURE (°C)
75 90
3458 G13
3458fa
4