LTC3458_15 Datasheet, PDF (6/16 Pages) Linear Technology – 1.4A, 1.5MHz Synchronous Step-Up DC/DC Converter with Output Disconnect

LTC3458
TYPICAL PERFOR A CE CHARACTERISTICS
Sync Operation at 1.33MHz
FF Mode 100-300mA Load Step
SW
5V/DIV
SYNC
2V/DIV
I_L
200mA/DIV
0mA
V_IN = 3.3V
V_OUT = 7V
R_OSC = 200k
500ns/DIV
Burst Mode Operation 10mA to
50mA Load Step
V_OUT
200mV/DIV
BURST
500mV/DIV
LOAD
50mA
10mA
V_OUT
200mV/DIV
COMP
500mV/DIV
I_L
0.5A/DIV
0mA
V_IN = 3.3V
V_OUT = 5V
R_Z = 33K
CC1 = 270pF
CC2 = 10pF
C_OUT = 22μF
200μs/DIV
L = 10μH
F = 1MHz
Auto Mode 10mA to 100mA Load
Step
V_OUT
200mV/DIV
BURST
1V/DIV
LOAD
100mA
10mA
I_L
200mA/DIV
I_L
200mA/DIV
V_IN = 3.3V
V_OUT = 5V
L = 10μH
C_OUT = 22μF
200μs/DIV
10mA to 200mA Load Step
Showing UV Trip
V_IN = 3.3V
500μs/DIV
V_OUT = 5V
L = 10μH
C_BURST = 0.015μF
R_BURST = 133k
Forced BURST to FF Mode
Switch with 50mA Load
V_OUT
200mV/DIV
I_L
200mA/DIV
6
– 4%
200μs/DIV
V_IN = 3.3V
V_OUT = 5V
L = 10μH
C_BURST = 0.015μF
R_BURST = 133k
V_OUT
200mV/DIV
FIXED
FREQUENCY
BURST
I_L
500mA/DIV
200μs/DIV
V_IN = 3.3V
V_OUT = 5V
L = 10μH
R_Z = 33k
CC1 = 270pF
CC2 = 10pF
C_OUT = 22μF
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