LTC3569_15 Datasheet, PDF (6/26 Pages) Linear Technology – Triple Buck Regulator with 1.2A and Two 600mA Outputs and Individual Programmable References

LTC3569
Typical Performance Characteristics T_A = 25°C, unless otherwise noted.
Buck1 Load Regulation
0.6
BUCK2, 3 OFF
0.4
0.2
V_IN = 5.5V
PULSE-SKIPPING
V_IN = 4.5V
0.0
–0.2
V_IN = 2.5V V_IN = 3.5V
–0.4
–0.6
0
0.2 0.4 0.6 0.8
I_LOAD (A)
1 1.2
3569 G13
Buck2 Load Regulation
0.6
BUCK1, 3 OFF
0.4
0.2
V_IN = 5.5V
PULSE-SKIPPING
V_IN = 4.5V
0.0
–0.2
V_IN = 2.5V V_IN = 3.5V
–0.4
–0.6
0
0.1 0.2 0.3 0.4 0.5 0.6
I_LOAD (A)
3569 G14
Buck3 Load Regulation
0.6
BUCK1, 2 OFF
0.4
0.2
0.0
PULSE-SKIPPING
–0.2
–0.4
V_OUT3 = 1.5V
–0.6
0 0.1 0.2 0.3 0.4
I_LOAD (A)
0.5 0.6
3569 G15
FB Pin Leakage
1000
V_IN = 5.5V
100
SLAVE
DETECTOR = 250nA
10
1
I_FB2,3
0.1
I_FB1
0.01
0.001
0
1
2
3
4
5
6
V_FB (V)
3569 G17
Line Regulation
0.15
EACH BUCK TESTED INDIVIDUALLY
0.10
BUCK2 = 1.2V
0.05
BUCK1 = 1.8V
0.00
–0.05
BUCK3 = 1.5V
–0.10
–0.15
2
PULSE-SKIPPING MODE
I_LOAD1 = 200mA
I_{LOAD2, 3} = 150mA
3
4
5
V_SUPPLY (V)
6
3569 G16
I_QSD vs Temperature
10000
V_IN = 5.5V
1000
100
10
1
0.1
–50
0
50
100
TEMPERATURE (°C)
150
3569 G18
6
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