ncp1421 ON Semiconductor, ncp1421 Datasheet - Page 4

• Manufacturer Part Number: ncp1421
• Description: 600 Ma Sync-rect Pfm Step-up Dc-dc Converter Step-up Dc-dc Converter With True-cutoff And Ring-killer
• Manufacturer: ON Semiconductor

5. Loading capability increases with V
6. Design guarantee, value depends on voltage at V
7. Values are design guaranteed.
ELECTRICAL CHARACTERISTICS
otherwise noted.)
Operating Voltage
Output Voltage Range
Reference Voltage
Reference Voltage
Reference Voltage Temperature Coefficient
Reference Voltage Load Current
Reference Voltage Load Regulation
Reference Voltage Line Regulation
FB Input Threshold (I
FB Input Threshold (I
LBI Input Threshold (I
LBI Input Threshold (T
Internal NFET ON−Resistance
Internal PFET ON−Resistance
LX Switch Current Limit (N−FET) (Note 7)
Operating Current into BAT
Operating Current into OUT (V
LX Switch MAX. ON−Time (V
LX Switch MIN. OFF−Time (V
FB Input Current
True−Cutoff Current into BAT
BAT−to−LX Resistance (V
LBI/EN Input Current
LBO Low Output Voltage (V
Soft−Start Time (V
EN Pin Shutdown Threshold (T
Thermal Shutdown Temperature (Note 7)
Thermal Shutdown Hysteresis (Note 7)
(V
(V
(V
(V
(V
(V
(LBI/EN = GND, V
OUT
OUT
OUT
OUT
OUT
BAT
= 1.8 V, V
= 3.3 V, I
= 3.3 V, I
= 3.3 V, V
= 3.3 V, I
from 1.5 V to 5.0 V, C
LOAD
LOAD
LOAD
FB
REF
IN
OUT
= 1.8 V, V
= 2.5 V, V
LOAD
LOAD
LOAD
= V
= 0 mA, C
= 0 mA, C
= 0 to 100 mA, C
A
= 0, V
= 25_C)
REF_NL
FB
= 0 mA, T
= 0 mA, T
= 0 mA, T
LBI
= 1.4 V, V
Characteristic
REF
FB
FB
LX
IN
FB
OUT
A
= 0, I
REF
REF
= 1.0 V, V
= 3.3 V, LX = 3.3 V)
= 1.8 V, V
= 1.0 V, V
"1.5% C
= 25 C)
= 1.0 mF)
= 1.4 V, V
= 5.0 V, C
= 200 nF, T
= 200 nF, T
SINK
OUT.
A
A
A
= −40 C to 85 C)
= −40_C to 85_C)
= 25 C)
REF
OUT
= 1.0 mA)
(V
OUT
OUT
OUT
REF
= 1.0 mF)
OUT
= 3.3 V) (Note 7)
OUT
REF
= 3.3 V, T
= 1.0 mF) (Note 5
= 3.3 V)
= 3.3 V, T
A
A
= 3.3 V)
= 3.3 V, T
= 25 C)
= −40 C to 85 C)
= 200 nF) (Note 6)
OUT.
A
A
A
http://onsemi.com
= 25_C)
= 25_C)
= 25 C for typical value, −40 C v T
NCP1421
)
4
V
R
R
V
V
V
R
Symbol
REF_LOAD
TC
T
REF_LINE
DS(ON)_N
DS(ON)_P
V
V
T
V
REF_NL
REF_NL
I
BAT_LX
SDHYS
I
V
V
QBAT
t
I
LBO_L
V
V
I
T
SHDN
V
t
I
SHDN
REF
OFF
I
BAT
OUT
LIM
I
ON
LBI
VREF
FB
LBI
LBI
SS
FB
FB
Q
IN
A
1.183
1.174
1.192
1.184
1.162
1.182
v 85 C for min/max values unless
0.46
0.35
Min
1.0
1.5
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
−
1.200
1.200
1.200
0.03
0.05
0.05
0.72
0.12
Typ
100
2.5
0.3
0.3
1.5
1.3
8.5
1.0
1.5
1.5
0.5
50
30
−
−
−
−
−
−
1.217
1.220
1.208
1.210
1.230
1.218
Max
1.15
0.22
0.67
145
5.0
5.0
1.0
1.0
0.2
14
50
50
20
−
−
−
−
−
3
−
−
−
mV/ C
mV/V
Unit
mA
mV
mA
mA
nA
nA
nA
ms
ms
ms
W
W
W
V
V
V
V
V
V
V
V
A
V
V
C
C