Datasheet

NCP1421
http://onsemi.com
2
Chip
Enable
Figure 1. Detailed Block Diagram
_ZCUR
_MSON
_CEN
_PFM
_TSDON
_MAINSW2ON
_MAINSWOFD
_SYNSW2ON
_SYNSWOFD
_V
REFOK
CONTROL LOGIC
20 mV
+
−
PFM
Voltage
Reference
REF
4
LBI/EN
2
+
−
FB
1
+
−
ZLC
+
TRUE CUTOFF
CONTROL
V
DD
GND
V
DD
GND
+
−
+
GND
R
SENSE
GND
SENSEFET
M1
V
DD
M3
BAT
5
LX
7
OUT
8
V
BAT
6
GND
V
OUT
LBO
3
_ILIM
0.5 V
1.20 V
M2