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NCP1404 Datasheet PDF : 8 Pages
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NCP1404 Series
ELECTRICAL CHARACTERISTICS (For all values TA = 25_C unless otherwise noted.)
Characteristic
Symbol
Min
OSCILLATOR
Frequency (VOUT = VSET × 0.96) (Note 4)
Frequency Temperature Coefficient (TA = –40 to +85_C)
Maximum PWM Duty Cycle (VOUT = VSET × 0.96)
PFM Duty Cycle
Minimum Start–up Voltage (IO = 0 mA, VDD = VOUT = VSET)
Minimum Start–up Voltage Temperature Coefficient (TA = –40 to +85_C)
Soft–Start Time (VOUT = VSET)
LX (PIN 6)
Internal Switching N–Channel FET Drain Voltage
LX On–State Current (VDD = VOUT = VSET × 0.96, VLX = 0.6 V)
Device Suffix:
19T1
27T1
30T1
33T1
50T1
fOSC
480
Df
–
DMAX
70
DPFM
12
Vstart
–
DVstart
–
tSS
0.3
VLX
–
VLX
350
550
550
550
600
Current Limit
Off–State Leakage Current (VLX = 6.0 V, TA = –40 to +85_C)
LBI (PIN 1)
LBI Threshold Voltage Falling
LBI Hysteresis
LBI Input Current
LBO (PIN 5)
LBO Low Output Voltage
LBO Off–State Leakage Current
TOTAL DEVICE
Supply Voltage
Output Voltage
Device Suffix:
19T1
27T1
30T1
33T1
50T1
ILXLIM
ILKG
700
–
VLBI
VHYS
ILBI
0.396
–
–
VLBO(low)
–
ILBOLKG
–
VDD
VOUT
0.8
1.853
2.632
2.925
3.218
4.875
Output Voltage Temperature Coefficient (TA = –40 to +85_C)
Operating Current (VOUT = VSET × 0.96, VDD = VSET × 0.6) (Note 5)
No Switching Operating Current (VOUT = VSET + 0.5 V)
No Load Operating Current
(VDD = VSET × 0.6, IOUT = 0 mA ) (Note 7)
Maximum Output Current
(VDD = VOUT, VIN = VSET × 0.8, Voltage Regulation < 3%)
Device Suffix:
19T1
27T1
30T1
33T1
50T1
DVOUT
–
IDD1
–
IDD2
–
IDD(no load)
–
IOUT
150
300
300
300
350
4. VSET means setting of output voltage.
5. Operating current is the current consumption of the device in PWM mode.
6. No switching operating current is the current consumption of the device when there is no switching.
7. No load operating current is the current consumption of the device in PFM mode at no load.
Typ
600
0.11
78
17
0.8
–1.6
2.0
–
400
600
600
600
650
750
0.5
0.400
30
1.5
–
1
1.9
2.7
3.0
3.3
5.0
100
220
40
65
200
350
350
350
400
Max
Unit
720
kHz
–
%/_C
86
%
22
%
0.95
V
–
mV/_C
–
ms
6.0
V
mA
–
–
–
–
–
800
mA
1.0
mA
0.404
V
–
mV
8.0
nA
0.05
V
100
nA
5.5
1.948
2.768
3.075
3.383
5.125
–
300
55
80
V
V
ppm/_C
mA
mA
mA
mA
–
–
–
–
–
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