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LM1572 Scheda tecnica(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Il numero della parte LM1572
Spiegazioni elettronici  1.5A, 500kHz Step-down Voltage Regulator
PDF  17 Pages
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Produttore elettronici  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM1572 Scheda tecnica(HTML) 5 Page - National Semiconductor (TI)

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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
ESD Tolerance (Note 2)
2kV
Input Voltage
17V
SD Pin Voltage
7V
FB Pin Voltage (All Options)
7V
Storage Temp. Range
−65˚C to 150˚C
Junction Temperature
150˚C
Operating Ratings
Supply Voltage (V
IN) (Note 3)
8.5V to 16V
Junction Temperature Range
−40˚C to +125˚C
Package Thermal Resistance
(TSSOP-16) (Note 4)
130˚C/W
Electrical Characteristics
Unless otherwise specified, all limits are guaranteed for T
A = 25˚C, VIN = 15V, VCOMP = 1.5V, VSD = 5V, ILOAD = 0A, unless
otherwise noted. Boldface apply over the temperature extremes. ’V
FB low (high)’ is 0.95 (1.05) times the nominal value at
regulation.
Symbol
Parameter
Conditions
Min
(Note 5)
Typ
(Note
6)
Max
(Note 5)
Units
V
FB_ADJ
Voltage on Feedback pin
(Adjustable version in regulation)
2.37
2.35
2.42
2.49
2.5
V
V
FB_5
Voltage on Feedback pin (Fixed
5V version in regulation)
4.85
4.8
5.0
5.15
5.2
V
V
FB_3.3
Voltage on Feedback pin (Fixed
3.3V version in regulation)
3.22
3.16
3.3
3.4
3.44
V
∆V
FB/VIN
Feedback Voltage Line
Regulation
V
IN = 8.5V to VIN = 16V
−0.05
0
0.05
%/V
I
FB_REG
Feedback Pin Bias Current
(Adjustable Part)
V
FB at regulation
0
0.5
1.5
µA
AV
ERROR
Error Amplifier Voltage Gain
(Note 7)
350
gm
EA
Error Amplifier
Transconductance (Note 7)
1100
800
2000
2700
3200
µMho
gm
COMP_SW
Comp Pin to Switch Current
Transconductance
2
A/V
I
EA_SOURCE
Error Amplifier Source Current
V
FB low
50
200
300
µA
I
EA_SINK
Error Amplifier Sink Current
V
FB high
2.4
mA
V
COMP_TH
Comp Pin Switching Threshold
Duty Cycle = 0
0.9
V
V
COMP_LIM
Comp Pin High Clamp
2
V
I
CLIM
Switch Current Limit
V
BOOT =VSW + 5V,
Comp Open,
V
FB low
D
≤ 0.5
2.0
2.7
3.2
A
D = 0.8
1.75
2.4
3
R
DS
Switch ON Resistance
I
SW = 1.5A, VBOOT =VIN + 5V
0.15
0.4
0.5
Ω
D
MAX
Maximum Duty Cycle
(Note 8)
Comp Open,
V
FB low
86
94
%
f
SW
Switch Frequency
V
FB low, VCOMP = 1V,
Full Temp.
Range
400
500
570
kHz
-20˚C
≤ T
J
≤
125˚C
440
560
f
REG
Switch Frequency Line
Regulation
V
IN = 8.5V and
V
IN = 16V,VFB low, VCOMP =1V
0.01
%/V
∆f
FOLDBACK
Foldback Frequency shift
(Adjustable part)
V
FB = 0.8V, VCOMP = 1V
20
90
160
kHz
www.national.com
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