NCP1450A
http://onsemi.com
4
ELECTRICAL CHARACTERISTICS (For all values T
A
= 25°C, unless otherwise noted.)
Characteristic
Symbol Min Typ Max Unit
OSCILLATOR
Frequency (V
OUT
= V
SET
0.96, Note 5) f
OSC
144 180 216 kHz
Frequency Temperature Coefficient (T
A
= −40°C to 85°C)
f
− 0.11 − %/°C
Maximum PWM Duty Cycle (V
OUT
= V
SET
0.96) D
MAX
70 80 90 %
Minimum Startup Voltage (I
O
= 0 mA) V
start
− 0.8 0.9 V
Minimum Startup Voltage Temperature Coefficient (T
A
= −40°C to 85°C)
V
start
− −1.6 − mV/°C
Minimum Operation Hold Voltage (I
O
= 0 mA) V
hold
− 0.6 0.7 V
Soft−Start Time (V
OUT
= V
SET,
Note 6) t
SS
− 100 250 ms
CE (PIN 1)
CE Input Voltage (V
OUT
= V
SET
0.96)
High State, Device Enabled
Low State, Device Disabled
V
CE(high)
V
CE(low)
0.9
−
−
−
−
0.3
V
CE Input Current (Note 6)
High State, Device Enabled (V
OUT
= V
CE
= 5.0 V)
Low State, Device Disabled (V
OUT
= 5.0 V, V
CE
= 0 V)
I
CE(high)
I
CE(low)
−0.5
0
0
0.15
0.5
0.5
A
EXT (PIN 5)
EXT “H” Output Current (V
EXT
= V
OUT
−0.4 V)
Device Suffix:
19T1
27T1
30T1
33T1
50T1
I
EXTH
−
−
−
−
−
−25.0
−35.0
−37.7
−40.0
−53.7
−20.0
−30.0
−30.0
−30.0
−35.0
mA
EXT “L” Output Current(V
EXT
= 0.4 V)
Device Suffix:
19T1
27T1
30T1
33T1
50T1
I
EXTL
20.0
30.0
30.0
30.0
35.0
38.3
48.0
50.8
52.0
58.2
−
−
−
−
−
mA
TOTAL DEVICE
Output Voltage
Device Suffix:
19T1
27T1
30T1
33T1
50T1
V
OUT
1.853
2.633
2.925
3.218
4.875
1.9
2.7
3.0
3.3
5.0
1.948
2.768
3.075
3.383
5.125
V
Output Voltage Temperature Coefficient (T
A
= −40 to +85°C)
V
OUT
− 150 − ppm/°C
Operating Current (V
OUT
= V
CE
= V
SET
0.96, Note 5)
Device Suffix:
19T1
27T1
30T1
33T1
50T1
I
DD
−
−
−
−
−
55
93
98
103
136
90
140
150
160
220
A
Standby Current (V
OUT
= V
CE
= V
SET
+0.5 V) I
STB
− 15 20
A
Off−State Current (V
OUT
= 5.0 V, V
CE
= 0 V, T
A
= −40 to +85°C, Note 7) I
OFF
− 0.6 1.5
A
5. V
SET
means setting of output voltage.
6. This parameter is guaranteed by design.
7. CE pin is integrated with an internal 150 nA pullup current source.
