LM2717_08 NSC [National Semiconductor], LM2717_08 Datasheet - Page 5

• Manufacturer Part Number: LM2717_08
• Description: Dual Step-Down DC/DC Converter
• Manufacturer: NSC [National Semiconductor]

I
V
V
I
I
I
I
V
g
g
A
A
D
F
I
I
Q
CL1
CL2
B1
B2
SHDN1
SHDN2
m1
m2
SW
FB1
FB2
IN
V1
V2
MAX
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Electrical Characteristics
Specifications in standard type face are for T
Range (T
Symbol
V
SW1 Voltage
SW2 Voltage
FB1, FB2 Voltages
CB1, CB2 Voltages
V
V
SHDN1 Voltage
SHDN2 Voltage
SS1 Voltage
SS2 Voltage
(Note 6)
(Note 6)
IN
C1
C2
Voltage
Voltage
J
= −40°C to +125°C). V
Total Quiescent Current (both
switchers)
Fixed Buck Feedback Voltage
Adjustable Buck Feedback
Voltage
Fixed Buck Switch Current
Limit
Adjustable Buck Switch
Current Limit
Fixed Buck FB Pin Bias
Current
(Note 8)
Adjustable Buck FB Pin Bias
Current
(Note 8)
Input Voltage Range
Fixed Buck Error Amp
Transconductance
Adjustable Buck Error Amp
Transconductance
Fixed Buck Error Amp Voltage
Gain
Adjustable Buck Error Amp
Voltage Gain
Maximum Duty Cycle
Switching Frequency
Fixed Buck Shutdown Pin
Current
Adjustable Buck Shutdown Pin
Current
Parameter
IN
0.965V
= 5V, I
1.75V
L
−0.3V to V
≤
Not Switching
Switching, switch open
V
V
V
V
V
ΔI = 20µA
ΔI = 20µA
R
R
0V < V
0V < V
= 0A, and F
≤
J
SHDN
IN
IN
IN
IN
F
F
−0.3V to 7.5V
−0.3V to 7.5V
−0.3V to 2.1V
−0.3V to 2.1V
V
−0.3V to 22V
−0.3V to 22V
−0.3V to 22V
= 25°C and those with boldface type apply over the full Operating Temperature
V
= 46.4k
= 22.6k
C2
−0.3V to 7V
= 8V (Note 7)
= 8V (Note 7)
= 20V
= 20V
(Note 1)
C1
(V
≤
= 0V
SHDN1
SHDN2
≤
IN
1.565V
Conditions
=V
2.25V
IN
+7V
SW
SW
< 7.5V
< 7.5V
)
= 300kHz unless otherwise specified.
5
Operating Conditions
FSLCT Voltage
Maximum Junction Temperature
Power Dissipation(Note 2)
Lead Temperature
ESD Susceptibility (Note 3)
Operating Junction
Temperature Range
(Note 4)
Storage Temperature
Supply Voltage
SW1 Voltage
SW2 Voltage
Vapor Phase (60 sec.)
Infrared (15 sec.)
Human Body Model
(Note 4)
Min
200
475
89
−5
−5
4
(Note 5)
1.267
1340
1360
Typ
134
136
300
600
2.7
3.3
2.2
3.2
65
65
93
6
9
(Note 4)
Max
400
775
12
27
20
6
5
5
−40°C to +125°C
−65°C to +150°C
Internally Limited
AGND to 5V
www.national.com
4V to 20V
150°C
300°C
215°C
220°C
Units
µmho
µmho
kHz
kHz
V/V
V/V
mA
mA
µA
µA
nA
µA
µA
%
2kV
20V
20V
V
V
A
A
V