LTC3458L Datasheet, PDF (4/16 Pages) Linear Technology – 1.7A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect

LTC3458L
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)
3458L G07
Maximum Load Current
1600
1.8 to 5.5V_IN at 1MHz
1400 ^RILIM ^{= 84.5k}
5V_OUT
1200
1000
800
3.3V_OUT
600
400
200
0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
V_IN (V)
3458L G10
Efficiency vs Frequency
95
93
91
89
87 _{VIN = 3.3V}
V_OUT = 5V at 200mA
L = 7.4µH
85
500 700 900
1100
FREQUENCY (kHz)
1300
1500
3458L 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
3458L G11
N-Channel and P-Channel R_DS(ON)
0.5
V_IN = 3.3V
V_OUT = 5V
P-CHANNEL
0.3
0.2
N-CHANNEL
0.1
0
–40 –15 10
35
60
85
TEMPERATURE (°C)
3458L 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
3458L 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
3458L G13
3458lf
4