LTC1874 Linear Technology, LTC1874 Datasheet - Page 5

• Manufacturer Part Number: LTC1874
• Description: Dual Constant Frequency Current Mode Step-Down DC/DC Controller
• Manufacturer: Linear Technology

FUNCTIONAL DIAGRA
GND1
GND2
11
3
U
0.3V
V
IN
U
V
IN1
1
SENSE1
V
IN2
9
2
–
SENSE2
FOLDBACK
10
FREQ
OSC
–
+
SHORT-CIRCUIT
–
W
–
+
DETECT
I
CMP
CONTROLLER #2 IS THE SAME AS CONTROLLER #1
0.5 A
UNDERVOLTAGE
SLOPE
COMP
REFERENCE
VOLTAGE
LOCKOUT
V
+
–
IN
Controller #1
0.15V
Controller #2
0.3V
I
TH
/RUN2
5
V
0.8V
REF
I
TH
/RUN1
13
0.35V
–
+
RS1
R
S
+
–
Q
SHDN
BURST
CMP
CMP
SLEEP
SWITCHING
LOGIC AND
BLANKING
CIRCUIT
SHDN
UV
EAMP
OVP
+
–
+
–
1.2V
LTC1874
V
+
60mV
V
0.8V
REF
REF
V
IN
1874FD
PGATE1
PGATE2
PGND1
PGND2
5
PV
PV
V
V
16
15
14
12
FB1
FB2
4
8
7
6
IN1
IN2