LTC3546 Datasheet, PDF (11/28 Pages) Linear Technology – Dual Synchronous, 3A/1A or 2A/2A Confi gurable Step-Down DC/DC Regulator

FUNCTIONAL DIAGRAM
I_TH1
+
V_FB1
–
–
V_B +
0.552V +
–
+
0.63V –
RUN1
V_CCA
TRACK/SS1
INTERNAL
1.15μA _SOFT-START
MUX
VOLTAGE
REFERENCE
SYNC/MODE
V_CCA
GNDA
V_CCD
DEPENDENT SWITCH
AUTO DETECT AND CONTROL
GNDD
V_CCA
INTERNAL
1.15μA ^SOFT-START
TRACK/SS2
MUX
RUN2
0.63V –
+
–
0.552V +
V_FB2
V_{B +}
–
–
+
I_TH2
LTC3546
BMC1
I_TH LIMIT
1A REGULATOR ^VIN1
SLOPE
COMPENSATION
ANTI-SHOOT
SW1
THRU
LOGIC
PGND1
PGOOD1
OSCILLATOR
PHASE
FREQ
1A DEPENDENT
SWITCHES
MUX
ANTI-SHOOT
THRU
V_IN1D
SW1D
PGND1D
PGOOD2
PGND2
LOGIC
ANTI-SHOOT
THRU
SLOPE
COMPENSATION
SW2A
SW2B
I_TH LIMIT
BMC2
2A REGULATOR VIN2
3546 BD
3546fb
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