LTC3355_15 Datasheet, PDF (7/20 Pages) Linear Technology – 20V 1A Buck DC/DC with Integrated SCAP Charger and Backup Regulator

LTC3355
TYPICAL PERFORMANCE CHARACTERISTICS T_A = 25°C unless otherwise noted
Boost Line Regulation
4.050
PWM MODE
4.045
4.040
4.035
4.030
4.025
50mA
500mA
4.020
4.015
4.010
4.005
4.000
0.75 1.25 1.75 2.25 2.75
V_CAP (V)
3.25 3.75
3355 G19
Buck Load Step PWM
Logic Input Threshold vs
Temperature (EN_CHG, MODE)
1000
950
900
850
800
750
700
650
600
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3355 G20
Buck Load Step Burst Mode
Operation
PFI Threshold vs Temperature
810
805
800
795
790
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3355 G21
Boost Load Step PWM
V_OUT
100mV/DIV
AC-COUPLED
LOAD
CURRENT
500mA/DIV
50µs/DIV
LOAD STEP = 100mA to 600mA
V_IN = 12V
V_OUT = 4V
V_OUT
100mV/DIV
AC-COUPLED
LOAD
CURRENT
500mA/DIV
3355 G22
50µs/DIV
LOAD STEP = 100mA to 600mA
V_IN = 12V
V_OUT = 4V
V_OUT
100mV/DIV
AC-COUPLED
LOAD
CURRENT
500mA/DIV
3355 G23
50µs/DIV
LOAD STEP = 100mA to 600mA
V_CAP = 2.4V
V_OUT = 4V
3355 G24
Boost Load Step Burst Mode
Operation
V_OUT
100mV/DIV
AC-COUPLED
LOAD
STEP
500mA/DIV
50µs/DIV
LOAD STEP = 100mA to 600mA
V_CAP = 2.4V
V_OUT = 4V
3355 G25
Boost Error Amplifier Voltage
Gain vs Temperature
750
700
650
600
550
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3355 G30
Boost Error Amplifier
Transconductance vs Temperature
30
29
28
27
26
25
24
23
22
21
20
–50 –25
0 25 50 75 100 125
TEMPERATURE (°C)
3355 G27
For more information www.linear.com/LTC3355
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