E-L5973AD Datasheet, PDF (5/22 Pages) STMicroelectronics – 2 A switch step down switching regulator

L5973AD
3
Electrical characteristics
Electrical characteristics
T_J = 25 °C, V_CC = 12 V, unless otherwise specified
Table 4. Electrical characteristics
Symbol
Parameter
Test condition
Min Typ Max Unit
V_CC
Operating input voltage
range
V_o = 1.235 V; I_o = 2 A
4
36
V
R_DS(on)
MOSFET on
resistance
0.250 0.5
Ω
I_l
Maximum limiting
current
V_CC = 4.4 V to 36 V
2
2.3 3.5
A
f_s
Switching frequency
500
kHz
Duty cycle
0
100
%
Dynamic characteristics (see test circuit).
V₅
Voltage feedback
4.4 V < V_CC < 36 V,
20 mA < I_O < 2 A
1.220 1.235 1.25
V
η
Efficiency
V_O = 5 V, V_CC = 12 V
90
%
DC characteristics
I_qop
I_q
I_qst-by
Total operating
quiescent current
Quiescent current
Total stand-by
quiescent current
Duty cycle = 0;
V_FB = 1.5 V
V_inh > 2.2 V
5
7
mA
2.7 mA
50 100 μA
Inhibit
Device ON
INH threshold voltage
Device OFF
0.8
V
2.2
V
Error amplifier
V_OH
V_OL
I_{o source}
I_{o sink}
I_b
High level output
voltage
VFB = 1 V
Low level output
voltage
VFB = 1.5 V
Source output current
V_COMP = 1.9 V;
V_FB = 1 V
Sink output current
V_COMP = 1.9 V;
V_FB = 1.5 V
Source bias current
DC open loop gain
R_L = ∞
3.5
V
0.4
V
200 300
μA
1
1.5
mA
2.5
4
μA
50
57
dB
Doc ID 9552 Rev 9
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