LM2717-ADJ_08 NSC [National Semiconductor], LM2717-ADJ_08 Datasheet - Page 6

• Manufacturer Part Number: LM2717-ADJ_08
• Description: Dual Step-Down DC/DC Converter
• Manufacturer: NSC [National Semiconductor]

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I
I
I
I
R
R
Th
Th
I
I
UVP
θ
SHDN1
SHDN2
L1
L2
SS1
SS2
JA
DSON1
DSON2
Note 1: Absolute maximum ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions for which the device is intended
to be functional, but device parameter specifications may not be guaranteed. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: The maximum allowable power dissipation is a function of the maximum junction temperature, T
θ
temperature is calculated using: P
the regulator will go into thermal shutdown.
Note 3: The human body model is a 100 pF capacitor discharged through a 1.5kΩ resistor into each pin.
Note 4: All limits guaranteed at room temperature (standard typeface) and at temperature extremes (bold typeface). All room temperature limits are 100% tested
or guaranteed through statistical analysis. All limits at temperature extremes are guaranteed via correlation using standard Statistical Quality Control (SQC)
methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
Note 5: Typical numbers are at 25°C and represent the most likely norm.
Note 6: Duty cycle affects current limit due to ramp generator.
Note 7: Current limit at 0% duty cycle. See TYPICAL PERFORMANCE section for Switch Current Limit vs. Input Voltage.
Note 8: Bias current flows into FB pin.
Note 9: Includes the bond wires and package leads, R
Note 10: Refer to National's packaging website for more detailed thermal information and mounting techniques for the TSSOP package.
Symbol
SHDN1
SHDN2
JA
, and the ambient temperature, T
Buck 1 Shutdown Pin Current 0V < V
Buck 2 Shutdown Pin Current 0V < V
Buck 1 Switch Leakage
Current
Buck 2 Switch Leakage
Current
Buck 1 Switch R
Buck 2 Switch R
Buck 1 SHDN Threshold
Buck 2 SHDN Threshold
Buck 1 Soft Start Pin Current
Buck 2 Soft Start Pin Current
On Threshold
Off Threshold
Thermal Resistance
(Note 10)
Parameter
D
DSON
DSON
A
(MAX) = (T
. See the Electrical Characteristics table for the thermal resistance. The maximum allowable power dissipation at any ambient
(Note 9) I
(Note 9) I
J(MAX)
− T
V
V
Output High
Output Low
Output High
Output Low
TSSOP, package only
DSON
SW
SW
IN
IN
A
)/θ
= 20V
= 20V
= 100mA
= 100mA
from V
JA
. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and
SHDN1
SHDN2
Conditions
IN
pin(s) to SW pin.
< 7.5V
< 7.5V
6
(Note 4)
Min
1.8
1.8
−5
−5
4
4
4
J
(MAX), the junction-to-ambient thermal resistance,
(Note 5)
0.01
0.01
1.36
1.33
1.36
1.33
Typ
160
160
115
3.8
3.6
9
9
(Note 4)
Max
180
300
180
300
0.7
0.7
3.3
15
15
5
5
5
5
Units
°C/W
mΩ
mΩ
µA
µA
µA
µA
µA
µA
V
V
V