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L5973AD 数据表(PDF) 3 Page - STMicroelectronics

部件名 L5973AD
功能描述  2A SWITCH STEP DOWN SWITCHING REGULATOR
PDF  14 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L5973AD 数据表(HTML) 3 Page - STMicroelectronics

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L5973AD
Table 5. Electrical Characteristics (Tj = 25°C, VCC = 12V, unless otherwise specified.)
Note:
1. Guaranteed by design
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
VCC
Operating input voltage range
Vo = 1.235V; Io = 2A
4.4
36
V
RDSON
Mosfet on Resistance
0.250
0.5
Ω
Il
Maximum limiting current
VCC = 4.4V to 36V
2
2.3
A
fs
Switching frequency
500
KHz
Duty cycle
0
100
%
DYNAMIC CHARACTERISTICS (see test circuit ).
V5
Voltage feedback
4.4V < VCC < 36V
1.220
1.235
1.25
V
η
Efficiency
VO = 5V, VCC = 12V
90
%
DC CHARACTERISTICS
Iqop
Total Operating Quiescent Current
5
7
mA
Iq
Quiescent current
Duty Cycle = 0; VFB = 1.5V
2.7
mA
Iqst-by
Total stand-by quiescent current
Vinh > 2.2V
50
100
µA
INHIBIT
INH Threshold Voltage
Device ON
0.8
V
Device OFF
2.2
V
ERROR AMPLIFIER
VOH
High level output voltage
VFB = 1V
3.5
V
VOL
Low level output voltage
VFB = 1.5V
0.4
V
Io source
Source output current
VCOMP = 1.9V; VFB = 1V
200
300
µA
Io sink
Sink output current
VCOMP = 1.9V; VFB = 1.5V
1
1.5
mA
Ib
Source bias current
2.5
4
µA
DC open loop gain
RL =
∞
50
57
dB
gm
Transconductance
Icomp = -0.1mA to 0.1mA
VCOMP = 1.9V
2.3
mS
SYNC FUNCTION
High Input Voltage
VCC = 4.4V to 36V
2.5
VREF
V
Low Input Voltage
VCC = 4.4V to 36V
0.74
V
Slave Sink Current
Vsync = 0.74V
(1)
Vsync = 2.33V
0.11
0.21
0.25
0.45
mA
mA
Master Output Amplitude
Isource = 3mA
2.75
3
V
Output Pulse Width
no load, Vsync = 1.65V
0.20
0.35
µs
REFERENCE SECTION
Reference Voltage
3.234
3.3
3.366
V
IREF = 0 to 5mA
VCC = 4.4V to 36V
3.2
3.3
3.399
V
Line Regulation
IREF = 0mA
VCC = 4.4V to 36V
510
mV
Load Regulation
IREF = 0 to 5mA
8
15
mV
Short Circuit Current
10
18
30
mA



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