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LM2678 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part No. LM2678
Description  SIMPLE SWITCHER High Efficiency 5A Step-Down Voltage Regulator
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
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 4 page
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All Output Voltage Versions
Electrical Characteristics
Limits appearing in bold type face apply over the entire junction temperature range of operation, −40˚C to 125˚C. Specifica-
tions appearing in normal type apply for T
A =TJ = 25˚C. Unless otherwise specified VIN=12V for the 3.3V, 5V and Adjustable
versions and V
IN=24V for the 12V version.
Symbol
Parameter
Conditions
Typ
Min
Max
Units
DEVICE PARAMETERS
I
Q
Quiescent
Current
V
FEEDBACK = 8V
4.2
6
mA
For 3.3V, 5.0V, and ADJ Versions
V
FEEDBACK = 15V
For 12V Versions
I
STBY
Standby
Quiescent
Current
ON/OFF Pin = 0V
50
100/150
µA
I
CL
Current Limit
7
6.1/5.75
8.3/8.75
A
I
L
Output Leakage
Current
V
IN = 40V, ON/OFF Pin = 0V
V
SWITCH =0V
V
SWITCH = −1V
16
200
15
µA
mA
R
DS(ON)
Switch
On-Resistance
I
SWITCH = 5A
0.12
0.14/0.225
f
O
Oscillator
Frequency
Measured at Switch Pin
260
225
280
kHz
D
Duty Cycle
Maximum Duty Cycle
91
%
Minimum Duty Cycle
0
%
I
BIAS
Feedback Bias
Current
V
FEEDBACK = 1.3V
ADJ Version Only
85
nA
V
ON/OFF
ON/OFF
Threshold
Voltage
1.4
0.8
2.0
V
I
ON/OFF
ON/OFF Input
Current
ON/OFF Input = 0V
20
45
µA
θ
JA
Thermal
Resistance
T Package, Junction to Ambient
65
(Note 5)
θ
JA
T Package, Junction to Ambient
45
(Note 6)
θ
JC
T Package, Junction to Case
2
θ
JA
S Package, Junction to Ambient
56
˚C/W
(Note 7)
θ
JA
S Package, Junction to Ambient
35
(Note 8)
θ
JA
S Package, Junction to Ambient
26
(Note 9)
θ
JC
S Package, Junction to Case
2
++
θ
JA
SD Package, Junction to Ambient
55
˚C/W
(Note 10)
θ
JA
SD Package, Junction to Ambient
29
(Note 11)
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings indicate conditions under which of the device is
guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test condition, see the electrical
Characteristics tables.
Note 2: ESD was applied using the human-body model, a 100pF capacitor discharged through a 1.5 k
Ω resistor into each pin.
Note 3: Typical values are determined with TA =TJ = 25˚C and represent the most likely norm.
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