sc1485itstr Semtech Corporation, sc1485itstr Datasheet - Page 7

• Manufacturer Part Number: sc1485itstr
• Description: Dual Synchronous Buck Pseudo Fixed Frequency Power Supply Controller
• Manufacturer: Semtech Corporation

POWER MANAGEMENT
Block Diagram
2005 Semtech Corp.
VCCA1 (25)
EN/SPV1 (22)
TON1 (23)
VOUT1 (24)
FB1 (26)
PGD1 (27)
VSSA1 (28)
VCCA2 (11)
EN/SPV2 (8)
TON2 (9)
VOUT2 (10)
FB2 (12)
PGD2 (13)
VSSA2 (14)
POR / SS
1.5V REF
POR / SS
1.5V REF
X3
X3
TON
TOFF
TON
TOFF
+
-
+
-
FAULT
MONITOR
FAULT
MONITOR
OT
OT
FIGURE 1.
7
ON
OFF
PWM
REF + 10%
REF - 10%
REF - 30%
ON
OFF
PWM
REF + 10%
REF - 10%
REF - 30%
ZERO I
OV
UV
ZERO I
OV
UV
OC
OC
CONTROL
LOGIC
CONTROL
LOGIC
ISENSE
ISENSE
HI
LO
HI
LO
BST1 (7)
DH1 (6)
LX1 (5)
ILIM1 (4)
VDDP1 (3)
DL1 (2)
PGND1 (1)
BST2 (21)
DH2 (20)
LX2 (19)
ILIM2 (18)
VDDP2 (17)
DL2 (16)
PGND2 (15)
SC1485
www.semtech.com