NCV890130
http://onsemi.com
5
ELECTRICAL CHARACTERISTICS (V
IN
= 4.5 V to 28 V, V
EN
= 5 V, V
BST
= V
SW
+ 3.0 V, C
DRV
= 0.1 mF, Min/Max values are valid
for the temperature range −40°C ≤ T
J
≤ 150°C unless noted otherwise, and are guaranteed by test, design or statistical correlation.)
Parameter Symbol Conditions Min Typ Max Unit
QUIESCENT CURRENT
Quiescent Current, shutdown
I
qSD
V
IN
= 13.2 V, V
EN
= 0 V, T
J
= 25°C
10
mA
Quiescent Current, enabled I
qEN
V
IN
= 13.2 V
3.0 mA
UNDERVOLTAGE LOCKOUT − VIN (UVLO)
UVLO Start Threshold
V
UVLSTT
V
IN
rising 4.1 4.5 V
UVLO Stop Threshold V
UVLSTP
V
IN
falling 3.9 4.4 V
UVLO Hysteresis V
UVLOHY
0.1 0.2 V
ENABLE (EN)
Logic Low
V
ENLO
0.8 V
Logic High V
ENHI
2.0 V
Input Current I
EN
8.0 30
mA
SOFT−START (SS)
Soft−Start Completion Time
t
SS
0.8 1.4 2.0 ms
VOLTAGE REFERENCE
FB Pin Voltage during regulation V
FBR
COMP shorted to FB 0.786 0.8 0.814 V
ERROR AMPLIFIER
FB Bias Current
I
FBBIAS
V
FB
= 0.8 V 0.25 1.0
mA
Transconductance
g
m
g
m(HV)
V
COMP
= 1.3 V
4.5 V < V
IN
< 18 V
20 V < V
IN
< 28 V
0.6
0.3
1.0
0.5
1.5
0.75
mmho
Output Resistance R
OUT
1.4
MW
COMP Source Current Limit I
SOURCE
V
FB
= 0.63 V, V
COMP
= 1.3 V
4.5 V < V
IN
< 18 V
20 V < V
IN
< 28 V
75
40
mA
COMP Sink Current Limit I
SINK
V
FB
= 0.97 V, V
COMP
= 1.3 V
4.5 V < V
IN
< 18 V
20 V < V
IN
< 28 V
75
40
mA
Minimum COMP voltage V
CMPMIN
V
FB
= 0.97 V 0.2 0.7 V
OSCILLATOR
Frequency
F
SW
F
SW(HV)
4.5 < V
IN
< 18 V
20 V < V
IN
< 28 V
1.8
0.9
2.0
1.0
2.2
1.1
MHz
VIN FREQUENCY FOLDBACK MONITOR
Frequency Foldback Threshold
V
IN
rising
V
IN
falling
V
FLDUP
V
FLDDN
V
FB
= 0.63 V
18.4
18
20
19.8
V
Frequency Foldback Hysteresis V
FLDHY
0.2 0.3 0.4 V
VIN OVERVOLTAGE SHUTDOWN MONITOR
Overvoltage Stop Threshold
V
OVSTP
32.4 36 V
Overvoltage Start Threshold V
OVSTT
30 35.4 V
Overvoltage Hysteresis V
OVHY
0.6 1.5 2.4 V
SLOPE COMPENSATION
Ramp Slope (Note 1)
(With respect to switch current)
S
ramp
S
ramp(HV)
4.5 < V
IN
< 18 V
20 V < V
IN
< 28 V
0.7
0.25
1.3
0.6
A/ms
1. Not tested in production. Limits are guaranteed by design.
