NCV898032
www.onsemi.com
4
ELECTRICAL CHARACTERISTICS (−40°C < T
J
< 150°C, 3.2 V < V
IN
< 40 V, unless otherwise specified) Min/Max values are
guaranteed by test, design or statistical correlation.
Characteristic
Symbol Conditions Min Typ Max Unit
GENERAL
Quiescent Current, Sleep Mode
I
q,sleep
V
IN
= 13.2 V, EN = 0, T
J
= 25°C − 2.0 −
mA
Quiescent Current, Sleep Mode I
q,sleep
V
IN
= 13.2 V, EN = 0, −40°C < T
J
< 125°C − 2.0 6.0
mA
Quiescent Current, No switching I
q,off
Into VIN pin, EN = 1, No switching − 1.9 2.9 mA
Quiescent Current, Switching,
normal operation
I
q,on
Into VIN pin, EN = 1, Switching − 7.5 10 mA
OSCILLATOR
Minimum pulse width
t
on,min
30 65 90 ns
Maximum duty cycle D
max
YY = 32 85 87.5 91 %
Switching frequency f
s
YY = 32 1.8 2.0 2.2 MHz
Soft−start time t
ss
From start of switching with V
FB
= 0 until
reference voltage = V
REF
YY = 32 650 800 950
ms
Soft−start delay t
ss,dly
From EN → 1 until start of switching with
V
FB
= 0 with floating V
C
pin 80 100 280
ms
Slope compensating ramp S
a
YY = 32 179 204 240
mV/ms
ENABLE
EN pull−down current
I
EN
V
EN
= 5 V − 5.0 10
mA
EN input high voltage V
s,ih
V
IN
> V
UVLO
2.0 − 5.0 V
EN input low voltage V
s,il
0 − 800 mV
EN time−out ratio %t
en
From EN falling edge, to oscillator control
(EN high) or shutdown (EN low), Percent of
typical switching frequency
− − 350 %
CURRENT SENSE AMPLIFIER
Low−frequency gain
A
csa
Input−to−output gain at dc, ISNS v 1 V 0.9 1.0 1.1 V/V
Bandwidth BW
csa
Gain of A
csa
− 3 dB 2.5 − − MHz
ISNS input bias current I
sns,bias
Out of ISNS pin − 30 50
mA
Current limit threshold voltage V
cl
Voltage on ISNS pin
YY = 32 180 200 220
mV
Current limit,
Response time
t
cl
CL tripped until GDRV falling edge,
V
ISNS
= V
cl
(typ) + 60 mV
− 80 125 ns
Overcurrent protection,
Threshold voltage
%V
ocp
Percent of V
cl
125 150 175 %
Overcurrent protection,
Response Time
t
ocp
From overcurrent event, Until switching
stops, V
ISNS
= V
OCP
+ 40 mV
− 80 125 ns
VOLTAGE ERROR OPERATIONAL TRANSCONDUCTANCE AMPLIFIER
Transconductance
g
m,vea
V
FB
– V
ref
= ± 20 mV 0.80 1.20 1.63 mS
VEA output resistance R
o,vea
2.0 − −
MW
VFB input bias current I
vfb,bias
Current out of VFB pin − 0.5 2.0
mA
Reference voltage V
ref
0.194 0.200 0.206 V
VEA maximum output voltage V
c,max
2.5 − − V
VEA minimum output voltage V
c,min
− − 0.3 V
VEA sourcing current I
src,vea
VEA output current, Vc = 2.0 V 80 100 −
mA
VEA sinking current I
snk,vea
VEA output current, Vc = 0.7 V 80 100 −
mA
