LM2678T-3.3 National Semiconductor, LM2678T-3.3 Datasheet - Page 4

• Manufacturer Part Number: LM2678T-3.3
• Description: IC, STEP-DOWN REGULATOR, TO-220-7
• Manufacturer: National Semiconductor

Specifications of LM2678T-3.3

• Primary Input Voltage: 12V
• No. Of Outputs: 1
• Output Voltage: 3.3V
• Output Current: 5A
• No. Of Pins: 7
• Operating Temperature Range: -40°C To +125°C
• Supply Voltage Range: 8V To 40V
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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DEVICE PARAMETERS
I
I
I
I
R
f
D
I
V
I
θ
θ
θ
θ
θ
θ
θ
θ
θ
Symbol
Q
STBY
CL
L
O
BIAS
ON/OFF
JA
JA
JC
JA
JA
JA
JC
JA
JA
ON/OFF
DS(ON)
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.
Specifications appearing in normal type apply for T
justable versions and V
Quiescent Current V
Standby Quiescent
Current
Current Limit
Output Leakage
Current
Switch On-
Resistance
Oscillator
Frequency
Duty Cycle
Feedback Bias
Current
ON/OFF
Threshold Voltage
ON/OFF Input
Current
Thermal
Resistance
Parameter
IN
=24V for the 12V version.
For 3.3V, 5.0V, and ADJ Versions
V
For 12V Versions
ON/OFF Pin = 0V
V
V
V
I
Measured at Switch Pin
Maximum Duty Cycle
Minimum Duty Cycle
V
ADJ Version Only
ON/OFF Input = 0V
T Package, Junction to Ambient
(Note 5)
T Package, Junction to Ambient
(Note 6)
T Package, Junction to Case
S Package, Junction to Ambient
(Note 7)
S Package, Junction to Ambient
(Note 8)
S Package, Junction to Ambient
(Note 9)
S Package, Junction to Case
SD Package, Junction to Ambient
(Note 10)
SD Package, Junction to Ambient
(Note 11)
SWITCH
FEEDBACK
FEEDBACK
IN
SWITCH
SWITCH
FEEDBACK
= 40V, ON/OFF Pin = 0V
= 5A
= 0V
= −1V
= 8V
= 15V
= 1.3V
Conditions
A
= T
J
= 25°C. Unless otherwise specified V
4
0.12
Typ
260
4.2
1.4
50
16
91
85
20
65
45
56
35
26
55
29
7
0
2
2
IN
=12V for the 3.3V, 5V and Ad-
6.1/5.75
Min
225
0.8
0.14/0.225
100/150
8.3/8.75
Max
200
280
2.0
15
45
6
Units
°C/W
°C/W
kHz
mA
mA
μA
μA
nA
μA
++
%
%
Ω
A
V