NCV8873
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 − 1.5 2.5 mA
Quiescent Current, Switching,
normal operation
I
q,on
Into VIN pin, EN = 1, Switching − 4.0 6.0 mA
OSCILLATOR
Minimum pulse width
t
on,min
90 115 140 ns
Maximum duty cycle D
max
YY = 00
YY = 01
84
85
86.5
87.5
89
90
%
Switching frequency f
s
YY = 00
YY = 01
900
360
1000
400
1100
440
kHz
Soft−start time t
ss
From start of switching with V
FB
= 0 until
reference voltage = V
REF
YY = 00
YY = 01
1.3
3.3
1.6
4.0
1.9
4.7
ms
Soft−start delay t
ss,dly
From EN → 1 until start of switching with
V
FB
= 0 with floating V
C
pin − 240 280
ms
Slope compensating ramp S
a
YY = 00
YY = 01
114
25
130
30
146
35
mV/ms
ENABLE/SYNCHRONIZATION
EN/SYNC pull−down current
I
EN/SYNC
V
EN/SYNC
= 5 V − 5.0 10
mA
EN/SYNC input high voltage V
s,ih
V
IN
> V
UVLO
2.0 − 5.0 V
EN/SYNC input low voltage V
s,il
0 − 800 mV
EN/SYNC time−out ratio %t
en
From SYNC falling edge, to oscillator con-
trol (EN high) or shutdown (EN low), Per-
cent of typical switching frequency
− − 350 %
SYNC minimum frequency ratio %f
sync,min
Percent of f
s
− − 80 %
SYNC maximum frequency f
sync,max
1.1 − − MHz
Synchronization delay t
s,dly
From SYNC falling edge to GDRV falling
edge under open loop conditions.
− 50 100 ns
Synchronization duty cycle D
sync
25 − 75 %
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 = 00
YY = 01
360
180
400
200
440
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
