LM2671LD-12 NSC [National Semiconductor], LM2671LD-12 Datasheet - Page 4

• Manufacturer Part Number: LM2671LD-12
• Description: SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage Regulator with Features
• Manufacturer: NSC [National Semiconductor]

www.national.com
Symbol
V
η
DEVICE PARAMETERS
I
I
I
I
R
f
D
I
V
I
F
V
V
I
θ
Symbol
Q
STBY
CL
L
O
BIAS
S/D
SS
JA
LM2671-ADJ
S/D
SYNC
SYNC
SS
FB
All Output Voltage Versions
Specifications with standard type face are for T
Range. Unless otherwise specified, V
and I
DS(ON)
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 kΩ 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 θ
thermal vias. For improved thermal resistance and power dissipation for the LLP package, refer to Application Note AN-1187.
LOAD
Feedback
Voltage
Efficiency
Quiescent Current
Standby Quiescent Current
Current Limit
Output Leakage Current
Switch On-Resistance
Oscillator Frequency
Maximum Duty Cycle
Minimum Duty Cycle
Feedback Bias
Current
ON/OFF Pin
Voltage Thesholds
ON/OFF Pin Current
Synchronization Frequency
Synchronization Threshold
Voltage
Soft-Start Voltage
Soft-Start Current
Thermal Resistance
= 100 mA.
Parameter
Parameters
(Continued)
V
V
(see Circuit of Figure 3)
V
IN
OUT
IN
J−A
= 6.5V to 40V, I
= 12V, I
Programmed for 5V
for the LLP (LD) package is specifically dependent on PCB trace area, trace material, and the number of layers and
IN
= 12V for the 3.3V, 5V, and Adjustable versions and V
LOAD
V
For 3.3V, 5.0V, and ADJ Versions
V
For 12V Versions
ON/OFF Pin = 0V
V
V
V
I
Measured at Switch Pin
V
ADJ Version Only
ON/OFF Pin = 0V
V
N Package, Junction to Ambient (Note 6)
M Package, Junction to Ambient (Note 6)
SWITCH
FEEDBACK
FEEDBACK
IN
SWITCH
SWITCH
FEEDBACK
SYNC
= 40V, ON/OFF Pin = 0V
Conditions
= 500 mA
J
LOAD
= 25˚C, and those in bold type face apply over full Operating Temperature
= 3.5V, 50% duty cycle
= 500 mA
= 0V
= −1V, ON/OFF Pin = 0V
= 8V
= 15V
= 1.3V
= 20 mA to 250 mA
Conditions
4
(Note 4)
1.210
Typ
90
0.25
0.63
Typ
260
400
105
2.5
2.5
0.8
1.4
1.4
4.5
50
95
85
20
95
1
6
0
1.192/1.174
(Note 5)
IN
0.62/0.575
Min
= 24V for the 12V version,
0.53
Min
225
0.8
1.5
7
1.228/1.246
(Note 5)
0.40/0.60
100/150
1.2/1.25
Max
Max
0.73
275
3.6
2.0
6.9
25
15
37
Units
Units
˚C/W
kHz
kHz
mA
mA
mA
µA
µA
nA
µA
µA
%
%
%
Ω
V
A
V
V
V