NCP1421 View Datasheet(PDF) - ON Semiconductor
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NCP1421 Datasheet PDF : 14 Pages
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NCP1421
ELECTRICAL CHARACTERISTICS (VOUT = 3.3 V, TA = 25°C for typical value, −40°C v TA v 85°C for min/max values unless
otherwise noted.)
Characteristic
Symbol
Min
Typ
Max
Unit
Operating Voltage
Output Voltage Range
Reference Voltage
(VOUT = 3.3 V, ILOAD = 0 mA, CREF = 200 nF, TA = 25°C)
Reference Voltage
(VOUT = 3.3 V, ILOAD = 0 mA, CREF = 200 nF, TA = −40°C to 85°C)
VIN
1.0
−
5.0
V
VOUT
1.5
−
5.0
V
VREF_NL
1.183
1.200
1.217
V
VREF_NL
1.174
−
1.220
V
Reference Voltage Temperature Coefficient
Reference Voltage Load Current
(VOUT = 3.3 V, VREF = VREF_NL "1.5% CREF = 1.0 mF) (Note 5)
TCVREF
IREF
−
0.03
−
mV/°C
−
2.5
−
mA
Reference Voltage Load Regulation
(VOUT = 3.3 V, ILOAD = 0 to 100 mA, CREF = 1.0 mF)
VREF_LOAD
−
0.05
1.0
mV
Reference Voltage Line Regulation
(VOUT from 1.5 V to 5.0 V, CREF = 1.0 mF)
FB Input Threshold (ILOAD = 0 mA, TA = 25°C)
FB Input Threshold (ILOAD = 0 mA, TA = −40°C to 85°C)
LBI Input Threshold (ILOAD = 0 mA, TA= −40_C to 85_C)
LBI Input Threshold (TA = 25_C)
Internal NFET ON−Resistance
Internal PFET ON−Resistance
LX Switch Current Limit (N−FET) (Note 7)
Operating Current into BAT
(VBAT = 1.8 V, VFB = 1.8 V, VLX = 1.8 V, VOUT = 3.3 V)
VREF_LINE
VFB
VFB
VLBI
VLBI
RDS(ON)_N
RDS(ON)_P
ILIM
IQBAT
−
1.192
1.184
1.162
1.182
−
−
−
−
0.05
1.200
−
1.200
0.3
0.3
1.5
1.3
1.0
mV/V
1.208
V
1.210
V
1.230
V
1.218
V
−
W
−
W
−
A
3
mA
Operating Current into OUT (VFB = 1.4 V, VOUT = 3.3 V)
LX Switch MAX. ON−Time (VFB = 1.0 V, VOUT = 3.3 V, TA = 25_C)
LX Switch MIN. OFF−Time (VFB = 1.0 V, VOUT = 3.3 V, TA = 25_C)
FB Input Current
True−Cutoff Current into BAT
(LBI/EN = GND, VOUT = 0, VIN = 3.3 V, LX = 3.3 V)
IQ
−
8.5
14
mA
tON
0.46
0.72
1.15
ms
tOFF
−
0.12
0.22
ms
IFB
−
1.0
50
nA
IBAT
−
50
−
nA
BAT−to−LX Resistance (VFB = 1.4 V, VOUT = 3.3 V) (Note 7)
LBI/EN Input Current
LBO Low Output Voltage (VLBI = 0, ISINK = 1.0 mA)
Soft−Start Time (VIN = 2.5 V, VOUT = 5.0 V, CREF = 200 nF) (Note 6)
EN Pin Shutdown Threshold (TA = 25°C)
Thermal Shutdown Temperature (Note 7)
Thermal Shutdown Hysteresis (Note 7)
5. Loading capability increases with VOUT.
6. Design guarantee, value depends on voltage at VOUT.
7. Values are design guaranteed.
RBAT_LX
−
100
−
W
ILBI
−
1.5
50
nA
VLBO_L
−
−
0.2
V
TSS
−
1.5
20
ms
VSHDN
0.35
0.5
0.67
V
TSHDN
−
−
145
°C
TSDHYS
−
30
−
°C
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