ltc3869gn-2 Linear Technology Corporation, ltc3869gn-2 Datasheet - Page 9

• Manufacturer Part Number: ltc3869gn-2
• Description: Ltc3869/ltc3869-2 - Dual, 2-phase Synchronous Step-down Dc/dc Controllers
• Manufacturer: Linear Technology Corporation

FREQ
I
PIN FUNCTIONS
FUNCTIONAL BLOCK DIAGRAM
LTC3869UFD
ONLY
INTV
control circuits are powered from this voltage. Decouple
this pin to PGND with a minimum of 4.7µF low ESR tan-
talum or ceramic capacitor.
LIM
PLL-SYNC
0.6V
REF
V
IN
CC
10µA
(Pin 19/Pin 21): Internal 5V Regulator Output. The
0.5V
+
SLEEP
I
51k
THB
1
–
I
CMP
MODE/PLLIN
+
–
OSC
INTV
MODE/SYNC
CC
+
DETECT
EA
3k
+
(UFD/GN)
–
SLOPE COMPENSATION
SLOPE RECOVERY
ACTIVE CLAMP
S
R
–
+
UVLO
Q
I
REV
I
TH
0.5V
R
–
+
C
SS
C
C1
F
0.6V
–
+
EXTV
–
1.2V
–
CC
RUN
RUN
F
4.7V
FCNT
+
RUN
+
ON
OV
PGOOD (Pin 13/Pin 15): Power Good Indicator Output.
Open drain logic out that is pulled to ground when either
channel output exceeds ±10% regulation windows, after
the internal 20µs power bad mask timer expires.
THROUGH
SWITCH
BURSTEN
LOGIC
SHOOT
ANTI-
AND
REG
TK/SS
5V
1.2 µ A
C
SS
LTC3869/LTC3869-2
UV
OV
+
–
+
–
SENSE
SENSE
PGOOD
3869 FD
BOOST
INTV
C
PGND
SGND
V
SW
BG
VCC
V
TG
IN
FB
0.54V
0.66V
CC
+
–
1 µ A
+
C
D
B
B
C
IN
M1
M2
V
L1
IN
INTV
CC
R2
R1
+
V
OUT
9
3869f
C
OUT