L5973D
ELECTRICAL CHARACTERISTICS (T = 25°C, V = 12V, unless otherwise specified.)
j
CC
(1)
(*) Specification Referred to Tj from -40 to 125°C
.
Symbol
Parameter
Operating input voltage range
Mosfet on Resistance
Maximum limiting current
Switching frequency
Test Condition
Min.
Typ. Max. Unit
V
CC
V = 1.235V; I = 2A
*
*
4.4
36
0.5
3.5
280
275
100
V
Ω
o
o
R
DSON
0.150
3
I
l
V
= 4.4V to 36V
2.5
212
225
0
A
CC
f
s
*
250
250
KHz
KHz
%
Duty cycle
DYNAMIC CHARACTERISTICS (see test circuit ).
V
Voltage feedback
4.4V < V < 36V,
1.220 1.235 1.25
1.198 1.235 1.272
90
V
V
5
CC
20mA < I < 2A
O
*
*
η
Efficiency
V
= 5V, V = 12V
%
O
CC
DC CHARACTERISTICS
I
Total Operating Quiescent
Current
3
5
mA
qop
I
Quiescent current
Duty Cycle = 0; V = 1.5V
2.5
100
150
mA
µA
µA
q
FB
I
Total stand-by quiescent current
V
> 2.2V
*
*
50
80
qst-by
inh
CC
V
= 36V; V > 2.2V
inh
INHIBIT
INH Threshold Voltage
Device ON
0.8
V
V
Device OFF
2.2
3.5
ERROR AMPLIFIER
V
High level output voltage
Low level output voltage
Source output current
Sink output current
VFB = 1V
V
OH
V
VFB = 1.5V
0.4
4
V
OL
o source
I
V
V
= 1.9V; V = 1V
200
1
300
1.5
2.5
57
µA
mA
µA
dB
mS
COMP
COMP
FB
I
= 1.9V; V = 1.5V
FB
o sink
I
Source bias current
DC open loop gain
b
R = ∞
L
50
gm
Transconductance
I
= -0.1mA to 0.1mA
2.3
comp
V
= 1.9V
COMP
SYNC FUNCTION
High Input Voltage
V
V
= 4.4V to 36V
= 4.4V to 36V
2.5
V
V
V
CC
CC
REF
Low Input Voltage
Slave Sink Current
0.74
V
V
= 0.74V
= 2.33V
0.11
0.21
0.25
0.45
mA
mA
sync
sync
Master Output Amplitude
Output Pulse Width
I
= 3mA
2.75
0.20
3
V
source
no load, V
= 1.65V
0.35
µs
sync
REFERENCE SECTION
Reference Voltage
3.234
3.2
3.3
3.3
3.366
3.399
V
V
I
= 0 to 5mA
*
REF
V
= 4.4V to 36V
CC
Line Regulation
I
= 0mA
5
10
mV
REF
V
= 4.4V to 36V
CC
Load Regulation
I
= 0 to 5mA
8
8
15
30
mV
mA
REF
Short Circuit Current
10
Notes: 1. Specification over the -40 to +125 Tj Temperature range are assured by design, characterization and statistical correlation.
2. Guaranteed by design.
3/10
STMICROELECTRONICS [ ST ]
