LTC3569_15 Datasheet, PDF (13/26 Pages) Linear Technology – Triple Buck Regulator with 1.2A and Two 600mA Outputs and Individual Programmable References

LTC3569
Operation
60ns < WIDTH < 55µs
t_EN = 125µs (TYP)
t_EN ^{tOFF 170µs (TYP)} t_EN
EN
V_REF
COUNTER
(15:0)
DAC
(15:0)
V_REF
SHUTDOWN
COUNTER INCREMENTS ON COUNTER RESETS TO FULL-SCALE IF EN COUNTER RESETS TO FULL-SCALE IF EN
FALLING EDGES OF EN
STAYS HIGH FOR MORE THAN 125µs
STAYS LOW FOR MORE THAN 170µs
15 ₁₄
15
13
14
13 _{12 11 10 9}
DAC LOADS COUNTER VALUE IF
15 ^{EN STAYS HIGH FOR MORE THAN 125µs}
13
0mV
BUCK OFF
COUNT13 = 750mV
SOFT-START
BUCK ON
15 ₁₄
15
15
9
COUNT9
= 650mV
COUNT15 = 800mV
SOFT-START
0mV
BUCK OFF ^{BUCK ON}
3569 TD
Figure 3. V_REF and ENx Timing Diagram
For more information www.linear.com/LTC3569
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