ADP1853 Datasheet, PDF (16/28 Pages) Analog Devices – Synchronous, Step-Down DC-to-DC Controller

ADP1853
THERMAL OVERLOAD PROTECTION
The ADP1853 has an internal temperature sensor that senses
the junction temperature of the chip. When the junction
temperature of the ADP1853 reaches approximately 155°C, the
ADP1853 goes into thermal shutdown, the converter is turned
off, and SS discharges toward zero through an internal 3 kΩ
resistor. At the same time, VCCO discharges to zero. When
the junction temperature drops below 135°C, the ADP1853
resumes normal operation after the soft start sequence.
INTERLEAVED DUAL-PHASE OPERATION
Two ADP1853 controllers can be configured to design a
dual-phase, interleaved, step-down, switching dc-to-dc
regulators. In dual-phase operation, the two outputs of the
switching regulators are tied together and can source more
than 50 A of output current depending on the selection of
the power components. See Figure 24 for a configuration of a
typical dual-phase application circuit. Note that only one error
amplifier, in the master ADP1853, works; the error amplifier in
the slave ADP1853 output is turned to tristate by tying FB to
VCCO. The CLKOUT signal from the master is connected to
the SYNC input of the slave controller; the SS signals of the
master and slave are tied together; COMP of the slave must be
tied to COMP of the master; and PGOOD of the slave must be
tied to PGOOD of the master.
Data Sheet
R_RAMP
RAMP VIN
EN
DH
TRK
BST
SW
VCCO
CS
ILIM
ADP1853
MASTER
DL
SYNC
FREQ
SS
PGND
FB
COMP
AGND
PGOOD
CLKOUT
V_IN
M1
L1
M2
R_CSG
V_OUT
R_RAMP
RAMP VIN
EN
DH
TRK
BST
SW
VCCO
CS
ILIM
ADP1853
SLAVE
DL
SYNC
FREQ
PGND
SS
AGND
COMP
FB
PGOOD
CLKOUT
V_IN
M3
L2
M4
R_CSG
Figure 24. Dual-Phase Application
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