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LM2671 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. LM2671
Description  SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage Regulator with Features
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM2671 Datasheet(HTML) 4 Page - National Semiconductor (TI)

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LM2671-ADJ (Continued)
Symbol
Parameter
Conditions
Typ
Min
Max
Units
(Note 4)
(Note 5)
(Note 5)
V
FB
Feedback
Voltage
V
IN = 6.5V to 40V, ILOAD = 20mAto250 mA
1.210
1.192/1.174
1.228/1.246
V
V
OUT Programmed for 5V
(see Circuit of Figure 3)
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 in bold type face apply over full Operating Temperature
Range. Unless otherwise specified, V
IN = 12V for the 3.3V, 5V, and Adjustable versions and VIN = 24V for the 12V version,
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
125
µA
V
SWITCH =0V
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
V
FEEDBACK = 1.3V
85
nA
Current
ADJ Version Only
V
S/D
ON/OFF Pin
1.4
0.8
2.0
V
Voltage Thesholds
I
S/D
ON/OFF Pin Current
ON/OFF Pin = 0V
20
737
µA
F
SYNC
Synchronization Frequency
V
SYNC = 3.5V, 50% duty cycle
400
kHz
V
SYNC
Synchronization Threshold
Voltage
1.4
V
V
SS
Soft-Start Voltage
0.63
0.53
0.73
V
I
SS
Soft-Start Current
4.5
1.5
6.9
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 LM2671 is used as shown in Figure 2 and Figure 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
4


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