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參數(shù)資料
| 型號(hào)： | LM2673 |
| 文件頁數(shù)： | 4/25頁 |
| 文件大小： | 495K |
| 代理商： | LM2673 |
LM2671-ADJ
(Continued)
Symbol
Parameter
Conditions
Typ
Min
Max
(Note 5)
Units
(Note 4)
(Note 5)
V
FB
Feedback
Voltage
V
IN
= 6.5V to 40V, I
LOAD
= 20 mA to 250 mA
1.210
1.192/
1.174
1.228/
1.246
V
V
OUT
Programmed for 5V
(see Circuit of Figure 3)
V
IN
= 12V, I
LOAD
= 500 mA
η
Efficiency
90
%
All Output Voltage Versions
Specifications with standard type face are for T
= 25C, 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 V
IN
= 24V for the 12V version,
and I
LOAD
= 100 mA.
Symbol
Parameters
Conditions
DEVICE PARAMETERS
I
Q
Quiescent Current
V
FEEDBACK
= 8V
For 3.3V, 5.0V, and ADJ Versions
V
FEEDBACK
= 15V
For 12V Versions
I
STBY
Standby Quiescent Current
ON/OFF Pin = 0V
I
CL
Current Limit
I
L
Output Leakage Current
V
IN
= 40V, ON/OFF Pin = 0V
V
SWITCH
= 0V
V
SWITCH
= 1V, ON/OFF Pin = 0V
R
DS(ON)
Switch On-Resistance
I
SWITCH
= 500 mA
f
O
Oscillator Frequency
Measured at Switch Pin
D
Maximum Duty Cycle
Minimum Duty Cycle
I
BIAS
Feedback Bias
V
FEEDBACK
= 1.3V
Current
ADJ Version Only
V
S/D
ON/OFF Pin
Voltage Thesholds
I
S/D
ON/OFF Pin Current
ON/OFF Pin = 0V
F
SYNC
Synchronization Frequency
V
SYNC
= 3.5V, 50% duty cycle
V
SYNC
Synchronization Threshold
Voltage
V
SS
Soft-Start Voltage
I
SS
Soft-Start Current
θ
JA
Thermal Resistance
N Package, Junction to Ambient (Note 6)
M Package, Junction to Ambient (Note 6)
Typ
Min
Max
Units
2.5
3.6
mA
2.5
mA
50
0.8
1
100/
150
1.2/
1.25
25
μA
A
μA
0.62/
0.575
6
15
mA
kHz
%
%
nA
0.25
260
95
0
85
0.40/
0.60
275
225
1.4
0.8
2.0
V
20
400
7
37
μA
kHz
1.4
V
0.63
4.5
95
105
0.53
1.5
0.73
6.9
V
μA
C/W
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
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 25C 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
JA
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.
L
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4
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