E-L5970D Datasheet, PDF (5/16 Pages) STMicroelectronics – Up to 1A step down switching regulator

L5970D
3
Electrical characteristics
Electrical characteristics
Table 4. Electrical characteristics
( T_J = 25°C, V_CC = 12V, unless otherwise specified)
Symbol
Parameter
Test condition
V_CC
Operating input
voltage range
V_o = 1.235V; I_o = 2A ⁽¹⁾
R_DS(on)
Mosfet on
Resistance
(1)
I_l
Maximum limiting
current
V_CC = 4.4V to 36V
(1)
f_s
Switching frequency
Duty cycle
Min Typ Max Unit
4.4
36
V
0.250 0.5 Ω
1.5 1.87 2.25 A
212 250 280 KHz
225 250 275 KHz
0
100 %
Dynamic characteristics (see test circuit ).
V₅
Voltage feedback
4.4V < V_CC < 36V,
20mA < I_O < 2A
1.220 1.235 1.25 V
(1) _{1.198 1.235 1.272 V}
h
Efficiency
V_O = 5V, V_CC = 12V
90
%
DC characteristics
I_qop
Total operating
quiescent current
(1)
I_q
Quiescent current
Duty cycle = 0;
V_FB = 1.5V
V_inh > 2.2V
(1)
I_qst-by
Total stand-by
quiescent current
V_CC = 36V;
(1)
V_inh > 2.2V
3
5 mA
2.5 mA
50 100 µA
80 150 µA
Inhibit
INH threshold
voltage
Device ON
Device OFF
0.8 V
2.2
V
Error amplfier
V_OH
V_OL
I_{o source}
High level output
voltage
Low level output
voltage
Source output
current
V_FB = 1V
V_FB = 1.5V
V_COMP = 1.9V;
V_FB = 1V
3.5
V
0.4 V
200 300
µA
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