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E-L4971 Datasheet(PDF) 4 Page - STMicroelectronics

Part No. E-L4971
Description  1.5A STEP DOWN SWITCHING REGULATOR
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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L4971
4/13
Soft Start
Soft start charge current
30
40
50
µA
Soft start discharge current
6
10
14
µA
Inhibit
VLL
Low level voltage
*
0.9
V
IsLL
Isource Low level
*
5
15
µA
DC Characteristics
Iqop
Total operating quiescent
current
46
mA
Iq
Quiescent current
Duty Cycle = 0; VFB = 3.8V
2.5
3.5
mA
Iqst-by
Total stand-by quiescent
current
Vinh <0.9V
100
200
µA
Vcc = 55V; Vinh<0.9V
150
300
µA
Error Amplifier
VFB
Voltage Feedback Input
3.33
3.36
3.39
V
RL
Line regulation
Vcc = 8 to 55V
5
10
mV
Ref. voltage stability vs
temperature
*
0.4
mV/°C
VoH
High level output voltage
VFB = 2.5V
10.3
V
VoL
Low level output voltage
VFB = 3.8V
0.65
V
Io source
Source output current
Vcomp = 6V; VFB = 2.5V
200
300
µA
Io sink
Sink output current
Vcomp = 6V; VFB= 3.8V
200
300
µA
Ib
Source bias current
2
3
µA
SVRR E/A
Supply voltage ripple rejection
Vcomp = Vfb; Vcc = 8 to 55V
60
80
dB
DC open loop gain
RL =
50
57
dB
gm
Transconductance
Icomp = -0.1 to 0.1mA
Vcomp = 6V
2.5
ms
Oscillator Section
Ramp Valley
0.78
0.85
0.92
V
Ramp peak
Vcc = 8V
2
2.15
2.3
V
Vcc = 55V
9
9.6
10.2
V
Maximum duty cycle
95
97
%
Maximum Frequency
Duty Cycle = 0% ;
Rosc = 13kΩ, Cosc = 820pF
300
kHz
Table 5. (Tj = 25°C, Cosc = 2.7nF, Rosc = 20kΩ, VCC = 24V, unless otherwise specified.)
* Specification Refered to Tj from 0 to 125°C




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