LTC3802 Datasheet, PDF (6/28 Pages) Linear Technology – Dual 550kHz Synchronous 2-Phase DC/DC Controller with Programmable Up/Down Tracking

LTC3802
TYPICAL PERFOR A CE CHARACTERISTICS
Load Step in Continuous Mode
Load Step in Burst Mode Operation
Burst Mode Waveform
with 0.2A Load
V_OUT
1.2V
50mV/DIV
I_OUT
1A TO 10A
STEP
5A/DIV
V_IN = 12V
CIRCUIT ON
20µs/DIV
FIRST PAGE OF THIS DATA SHEET
Burst Mode Waveform
with 3A Load
V_OUT
1.2V
50mV/DIV
V_SW
10V/DIV
INDUCTOR
CURRENT
5A/DIV
V_IN = 12V
CIRCUIT ON
20µs/DIV
FIRST PAGE OF THIS DATA SHEET
Short-Circuit Test
TG
10V/DIV
V_OUT
1.2V
50mV/DIV
V_SW
10V/DIV
I_OUT
1A TO 10A
STEP
5A/DIV
3802 G08
V_IN = 12V
CIRCUIT ON
50µs/DIV
FIRST PAGE OF THIS DATA SHEET
V_OUT
1.2V
50mV/DIV
V_SW
10V/DIV
INDUCTOR
CURRENT
5A/DIV
3802 G09
V_IN = 12V
CIRCUIT ON
50µs/DIV
FIRST PAGE OF THIS DATA SHEET
3802 G10
I_LIM(TH) Offset vs V_IMAX
10
T_A = 25°C
V_CC = 5V
6
I_LIM(TH) Offset vs Temperature
10
V_CC = 5V
V_IMAX = 500mV
6
2
2
–2
–2
–6
–6
3802 G11
–10
0
200 400 600
V_IMAX (mV)
Switching Frequency
vs Temperature
600
V_CC = 5V
580
800 1000
3802 G12
–10
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3802 G13
Switching Frequency
vs V_CC Supply Voltage
600
T_A = 25°C
580
560
560
RUN/SS
2V/DIV
540
540
INDUCTOR
CURRENT
20A/DIV
520
520
CIRCUIT ON
5µs/DIV
3802 G14
FIRST PAGE OF THIS DATA SHEET
V_IN = 12V, V_OUT = 3.3V, C_SS = 0.01µF,
R_I(MAX) = 47k, L = 1µH (TOKO-FDA1254-1ROM)
500
–50 –25
0 25 50 75
TEMPERATURE (°C)
100 125
3802 G15
500
3
3.5 4 4.5 5 5.5 6
V_CC SUPPLY VOLTAGE (V)
3802 G16
3802f
6