Datasheet

Electrical characteristics L6902
6/11 Doc ID 7332 Rev 9
5 Electrical characteristics
Tj = 25°C, V
CC
= 12V, unless otherwise specified.
Table 5. Electrical characteristics
Symbol Parameter Test condition Min. Typ. Max. Unit
V
CC
Operating input voltage range V
O
= 1.235V; I
O
= 1A 8 36 V
V
d
Dropout voltage V
CC
= 8V; I
O
= 1A 0.25 0.5 V
I
O
Operating charging current R
sense
= 0.1Ω
0.95 1 1.05 A
(1)
0.92 1.08 A
I
l
Maximum limiting current V
CC
= 8V to 36V 2 2.5 3.2 A
f
s
Switching frequency
(1)
212 250 287 kHz
225 250 275 kHz
d Duty cycle 0 100 %
Dynamic characteristics
V
5
Voltage feedback (FB) 8V < V
CC
< 36V, 20mA < I
O
< 1A
1.21 1.235 1.259 V
(1)
1.198 1.235 1.272 V
η Efficiency V
O
= 5V, V
CC
= 12V 90 %
DC characteristics
I
qop
Total operating quiescent
current
(1)
3 5 mA
I
q
Quiescent current Duty cycle = 0; VFB = 1.5V 3 mA
Voltage error amplifier
V
OH
High level output voltage V
FB
= 1V 3.6 V
V
OL
Low level output voltage V
FB
= 1.5 0.4 V
I
o source
Source output current Vcomp = 1.9V; VFB = 1V 200 300 µA
I
o sink
Sink output current Vcomp = 1.9V; VFB = 1.5V 1 1.5 mA
I
b
Source bias current 2.5 4 μA
DC open loop gain R
L
= 0 50 58 dB
g
m
Transconductance I
comp
= -0.1 to 0.1mA, V
comp
= 1.9V 2.3 mS
Current error amplifier
V
offs
Input offset voltage V
CS-
= 1.8V; V
CS+
= Vcomp 95 100 105 mV
I
CS+
CS+ output current
I
O
= 1A, R
sense
= 100mΩ,
V
out
< V
CC
-2V
1.5 3 µA
I
CS-
CS- output current
I
O
= 1A, R
sense
= 100mΩ
V
out
< V
CC
-2V
1.5 3 µA