Datasheet

3/11
L5970AD
Table 5. Electrical Characteristics (T
j
= 25°C, V
CC
= 12V, unless otherwise specified.)
Note: 1. Guaranteed by design
Symbol Parameter Test Condition Min. Typ. Max. Unit
V
CC
Operating input voltage range 4.4 36 V
R
DSON
Mosfet on Resistance 0.250 0.5 Ω
I
l
Maximum limiting current V
CC
= 4.4V to 36V 1.8 A
f
s
Switching frequency 500 KHz
Duty cycle 0 100 %
DYNAMIC CHARACTERISTICS
V
5
Voltage feedback 4.4V < V
CC
< 36V 1.220 1.235 1.25 V
η Efficiency V
O
= 5V, V
CC
= 12V 90 %
DC CHARACTERISTICS
I
qop
Total Operating Quiescent Current 5 7 mA
I
q
Quiescent current Duty Cycle = 0; V
FB
= 1.5V 2.7 mA
I
qst-by
Total stand-by quiescent current V
inh
> 2.2V 50 100 µA
INHIBIT
INH Threshold Voltage Device ON 0.8 V
Device OFF 2.2 V
ERROR AMPLIFIER
V
OH
High level output voltage VFB = 1V 3.5 V
V
OL
Low level output voltage VFB = 1.5V 0.4 V
I
o source
Source output current V
COMP
= 1.9V; V
FB
= 1V 200 300 µA
I
o sink
Sink output current V
COMP
= 1.9V; V
FB
= 1.5V 1 1.5 mA
I
b
Source bias current 2.5 4 µA
DC open loop gain R
L
= ∞ 50 57 dB
gm Transconductance I
comp
= -0.1mA to 0.1mA
V
COMP
= 1.9V
2.3 mS
SYNC FUNCTION
High Input Voltage V
CC
= 4.4V to 36V 2.5 V
REF
V
Low Input Voltage V
CC
= 4.4V to 36V 0.74 V
Slave Sink Current
V
sync
= 0.74V
(1)
V
sync
= 2.33V
0.11
0.21
0.25
0.45
mA
mA
Master Output Amplitude I
source
= 3mA 2.75 3 V
Output Pulse Width no load, V
sync
= 1.65V 0.20 0.35 µs
REFERENCE SECTION
Reference Voltage 3.234 3.3 3.366 V
I
REF
= 0 to 5mA
V
CC
= 4.4V to 36V
3.2 3.3 3.399 V
Line Regulation I
REF
= 0mA
V
CC
= 4.4V to 36V
510mV
Load Regulation I
REF
= 0 to 5mA 8 15 mV
Short Circuit Current 10 18 30 mA