NCP1423 Datasheet, PDF (4/13 Pages) ON Semiconductor – 400 mA Sync−Rect PFM Step−Up DC−DC Converter with True−Cutoff and Ring−Killer

NCP1423
EN ^{0.5 V} Chip
1
Enable
FB
3
REF
2
+
−
PFM
1.2 V
Voltage
Reference
0.5 V
+
LBI
9
−
V_BAT
BAT
M3 ₆
ZLC ₊
−
+
20 mV
CONTROL LOGIC
TRUE CUTOFF
CONTROL
_ZCUR _TSDON
V_DD
_MSON
_MAINSW2ON
M2
SENSEFET™
M1
_CEN
GND
_PFM
V_DD
_MAINSWOFD
_SYNSW2ON
LX
V_DD ⁷
OUT
5
V_OUT
GND
4
GND
_SYNSWOFD
_V_REFOK
_ILIM
+
−
GND
R_SENSE
+
GND
ADEN
8
LBO
10
GND
Figure 2. Detailed Block Diagram
http://onsemi.com
4