Datasheet

MCP1256/7/8/9
DS21989B-page 2  2006-2013 Microchip Technology Inc.
Package Pinouts
Functional Block Diagram
TABLE 1: SWITCH LOGIC
PGOOD
1
2
3
4
MCP1258
56
7
8
9
10
BYPASS
LBO 1
2
3
4
56
7
8
9
10
BYPASS
MCP1259
C
1
-C
2
-
PGOOD
GND
SHDN
1
2
3
4
MCP1256
C
1
+
V
OUT
C
2
+
5
6
7
8
9
10
V
IN
SLEEP
LBO 1
2
3
4
56
7
8
9
10
SLEEP
MCP1257
C
2
-
C
1
+
V
OUT
C
2
-
C
1
+
V
OUT
C
2
-
C
1
+
V
OUT
C
1
-
GND
SHDN
C
2
+
V
IN
C
1
-
GND
SHDN
C
2
+
V
IN
C
1
-
GND
SHDN
C
2
+
V
IN
S1
S2 S3
S4
S5
S7
S6
+
-
1.5x, 2x Mode
Comparator
840 k
720k
D Q
S5,S7
S6
S4
S1,S3,CE
Gate Drives
V
IN
C
2
-C
2
+C
1
-C
1
+
V
OUT
GND
480 k
840 k
+
-
Feedback
Amplifier
V
OUT
CE
Bandgap
Ref.
650 kHz
Osc.
Mode Phase Oscillator Q S1 S2(CE) S3 S4 S5 S6 S7
1.5x Charging H L H H H L H L H
1.5x Transfer L L L L L H L H L
2x Charging H H H H H L L H L
2x Transfer L H L L L H L H L
BYPASS — — — H L H H H L L
Legend: L is Logic Low, H is Logic High