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LM2717 Datasheet(PDF) 5 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part # LM2717
Description  Dual Step-down DC/DC Converter
PDF  12 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2717 Datasheet(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.
V
IN
−0.3V to 22V
SW1 Voltage
−0.3V to 22V
SW2 Voltage
−0.3V to 22V
FB1 Voltage
−0.3V to 7V
FB2 Voltage
−0.3V to 7V
V
C1 Voltage
1.75V
≤ V
C1
≤ 2.25V
V
C2 Voltage
0.965V
≤ V
C2
≤ 1.565V
SHDN1 Voltage
−0.3V to 7.5V
SHDN2 Voltage
−0.3V to 7.5V
SS1 Voltage
−0.3V to 2.1V
SS2 Voltage
−0.3V to 2.1V
FSLCT Voltage
AGND to 5V
Maximum Junction Temperature
150˚C
Power Dissipation(Note 2)
Internally Limited
Lead Temperature
300˚C
Vapor Phase (60 sec.)
215˚C
Infrared (15 sec.)
220˚C
ESD Susceptibility (Note 3)
Human Body Model
2kV
Operating Conditions
Operating Junction
Temperature Range
(Note 4)
−40˚C to +125˚C
Storage Temperature
−65˚C to +150˚C
Supply Voltage
4V to 20V
SW1 Voltage
20V
SW2 Voltage
20V
Electrical Characteristics
Specifications in standard type face are for T
J = 25˚C and those with boldface type apply over the full Operating Tempera-
ture Range (T
J = −40˚C to +125˚C). VIN = 5V, IL = 0A, and FSW = 300kHz unless otherwise specified.
Symbol
Parameter
Conditions
Min
(Note 4)
Typ
(Note 5)
Max
(Note 4)
Units
I
Q
Total Quiescent Current (both
switchers)
Not Switching
2.7
6
mA
Switching, switch open
6
12
mA
V
SHDN =0V
9
27
µA
V
FB1
Fixed Buck Feedback
Voltage
3.3
V
V
FB2
Adjustable Buck Feedback
Voltage
1.267
V
I
CL1(Note 6)
Fixed Buck Switch Current
Limit
V
IN = 8V (Note 7)
2.2
A
I
CL2(Note 6)
Adjustable Buck Switch
Current Limit
V
IN = 8V (Note 7)
3.2
A
I
B1
Fixed Buck FB Pin Bias
Current
(Note 8)
V
IN = 20V
65
µA
I
B2
Adjustable Buck FB Pin Bias
Current
(Note 8)
V
IN = 20V
65
nA
V
IN
Input Voltage Range
420
V
g
m1
Fixed Buck Error Amp
Transconductance
∆I = 20µA
1340
µmho
g
m2
Adjustable Buck Error Amp
Transconductance
∆I = 20µA
1360
µmho
A
V1
Fixed Buck Error Amp
Voltage Gain
134
V/V
A
V2
Adjustable Buck Error Amp
Voltage Gain
136
V/V
D
MAX
Maximum Duty Cycle
89
93
%
F
SW
Switching Frequency
R
F = 46.4k
200
300
400
kHz
R
F = 22.6k
475
600
775
kHz
www.national.com
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