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L5971D Datasheet(PDF) 4 Page - STMicroelectronics

Part # L5971D
Description  1.5A STEP DOWN SWITCHING REGULATOR
PDF  11 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5971D Datasheet(HTML) 4 Page - STMicroelectronics

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Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
DC Characteristics
Iqop
Total operating quiescent
current
Pin 5 (Pin 11)
3
4.5
mA
Iq
Quiescent current
Duty Cycle = 0; VFB = 1.7V
2.8
3.5
mA
Iqst-by
Total stand-by quiescent
current
Vinh <0.9V
100
200
µA
Vcc = 25V; Vinh <0.9V
150
300
µA
Error Amplifier
VFB
Voltage Feedback Input
1.247
1.26
1.273
V
RL
Line regulation
Vcc = 6.5 to 25V
5
10
mV
Ref. voltage stability vs
temperature
*
0.4
mV/
°C
VoH
High level output voltage
VFB = 0.8V
8.7
V
VoL
Low level output voltage
VFB = 1.7V
0.65
V
Io source
Source output current
Vcomp = 3V; VFB = 0.8V
180
250
µA
Io sink
Sink output current
Vcomp = 3V; VFB = 1.7V
200
300
µA
Ib
Source bias current
2
3
µA
SVRR E/A
Supply voltage ripple rejection
Vcomp =Vfb; Vcc = 6.5 to 25V
60
80
dB
DC open loop gain
RL =
∞
50
57
dB
gm
Transconductance
Icomp = -0.1 to 0.1mA
Vcomp =6V
4.3
mS
Oscillator Section
Ramp Valley
0.74
0.81
0.88
V
Ramp peak
Vcc = 6.5V
1.80
1.87
1.94
V
Vcc = 25V
4.72
4.79
4.86
V
Maximum duty cycle
95
97
%
Maximum Frequency
Duty Cycle = 0%
Rosc = 13k
Ω,Cosc = 820pF
500
kHz
ELECTRICAL CHARACTERISTICS (continued)
L5971
4/11



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