lt1941 Linear Technology Corporation, lt1941 Datasheet - Page 9

• Manufacturer Part Number: lt1941
• Description: Triple Monolithic Switching Regulator
• Manufacturer: Linear Technology Corporation

BLOCK DIAGRA
NEGATIVE
OUTPUTS
OUTPUTS
POSITIVE
FOR
FOR
–V
V
FB3
OUT3
OUT3
C
R3
(EXTERNAL)
R4
(EXTERNAL)
R3
(EXTERNAL)
R4
(EXTERNAL)
F
FB3
NFB
NFB
R
C
C
C
BIAS1
RUN/SS2
RUN/SS3
RUN/SS1
GND
FB3
NFB
V
PGOOD
V
C
C3
Figure 2. Block Diagram of the LT1941 with Associated External Components
W
CLK
–
+
RUN/SS
2µA
2µA
2µA
RUN/SS
SLOPE
+
–
SLAVE
1.12V
1.25V
OSC
0.4V
0.6V
∑
0.35V
0.9V
+
–
+
–
+
–
+
–
ERROR
AMP
1.7V
+
–
AND REF
INT REG
C1
V
IN
–
+
CLAMP
I
LIMIT
GENERATOR
OSCILLATOR
SLAVE
RAMP
Σ
R
S
MASTER
–
+
OSC
Q
C2
CLK1
CLK2
CLK3
CLK3
ERROR
R
+
–
AMP
V
IN
10.8V
S
4.5V
–
+
+
–
Q
+
–
+
–
54mV
0.628V
DRIVER
+
–
0.01Ω
PGOOD3
Q1
12GOOD
5GOOD
BOOST
BIAS2
PGND
SW3
SW
V
FB
IN
1941 F02
SW3
SW3
R2
D1
C
V
C3
IN
V
V
IN
IN
IN
L1
D2
L3
L4A
R1
C5
C1
D3
INVERTING
LT1941
BOOST
D4
L4B
C4
V
OUT
OUT3
C6
1941fa
–V
9
OUT3