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LM2674 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM2674
Description  SIMPLE SWITCHER Power Converter High Efficiency 500 mA Step-Down Voltage Regulator
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2674 Datasheet(HTML) 4 Page - National Semiconductor (TI)

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LM2674-ADJ (Continued)
Symbol
Parameter
Conditions
Typ
Min
Max
Units
(Note 4)
(Note 5)
(Note 5)
η
Efficiency
V
IN = 12V, ILOAD = 500 mA
90
%
All Output Voltage Versions
Specifications with standard type face are for T
J = 25˚C, and those with bold type face apply over full Operating Tempera-
ture Range. Unless otherwise specified, V
IN = 12V for the 3.3V, 5V, and Adjustable versions and VIN = 24V for the 12V ver-
sion, and I
LOAD = 100 mA.
Symbol
Parameters
Conditions
Typ
Min
Max
Units
DEVICE PARAMETERS
I
Q
Quiescent Current
V
FEEDBACK = 8V
2.5
3.6
mA
For 3.3V, 5.0V, and ADJ Versions
V
FEEDBACK = 15V
2.5
mA
For 12V Versions
I
STBY
Standby Quiescent
Current
ON/OFF Pin = 0V
50
100/150
µA
I
CL
Current Limit
0.8
0.62/0.575
1.2/1.25
A
I
L
Output Leakage Current
V
IN = 40V, ON/OFF Pin = 0V
V
SWITCH =0V
125
µA
V
SWITCH = −1V, ON/OFF Pin = 0V
615
mA
R
DS(ON)
Switch On-Resistance
I
SWITCH = 500 mA
0.25
0.40/0.60
f
O
Oscillator Frequency
Measured at Switch Pin
260
225
275
kHz
D
Maximum Duty Cycle
95
%
Minimum Duty Cycle
0
%
I
BIAS
Feedback Bias
Current
V
FEEDBACK = 1.3V
ADJ Version Only
85
nA
V
S/D
ON/OFF Pin
Voltage Thesholds
1.4
0.8
2.0
V
I
S/D
ON/OFF Pin Current
ON/OFF Pin = 0V
20
737
µA
θ
JA
Thermal Resistance
N Package, Junction to Ambient (Note 6)
95
˚C/W
M Package, Junction to Ambient (Note 6)
105
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
intended to be functional, but device parameter specifications may not be guaranteed under these conditions. For guaranteed specifications and test conditions, see
the Electrical Characteristics.
Note 2: The human body model is a 100 pF capacitor discharged through a 1.5 k
Ω resistor into each pin.
Note 3: External components such as the catch diode, inductor, input and output capacitors, and voltage programming resistors can affect switching regulator
performance. When the LM2674 is used as shown in Figures 2, 3 test circuits, system performance will be as specified by the system parameters section of the
Electrical Characteristics.
Note 4: Typical numbers are at 25˚C and represent the most likely norm.
Note 5: All limits guaranteed at room temperature (standard type face) and at temperature extremes (bold type face). All room temperature limits are 100%
production tested. 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 6: Junction to ambient thermal resistance with approximately 1 square inch of printed circuit board copper surrounding the leads. Additional copper area will
lower thermal resistance further. See Application Information section in the application note accompanying this datasheet and the thermal model in LM267X Made
Simple (version 6.0) software. The value
θJ−A for the LLP (LD) package is specifically dependent on PCB trace area, trace material, and the number of layers and
thermal vias. For improved thermal resistance and power dissipation for the LLP package, refer to Application Note AN-1187.
www.national.com
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