If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Supply Voltage
ON/OFF Pin Voltage
Switch Voltage to Ground
Boost Pin Voltage
Feedback Pin Voltage
ESD Susceptibility
Human Body Model (Note 2)
Power Dissipation
45V
−0.1V
≤
V
SH
≤
6V
−1V
V
SW
+ 8V
Storage Temperature Range
Lead Temperature
M Package
Vapor Phase (60s)
Infrared (15s)
N Package (Soldering, 10s)
LLP Package (see AN-1187)
Maximum Junction Temperature
−65°C to +150°C
+215°C
+220°C
+260°C
+150°C
−0.3V
≤
V
FB
≤
14V
Operating Ratings
Supply Voltage
Temperature Range
6.5V to 40V
−40°C
≤
T
J
≤
+125°C
2 kV
Internally Limited
Electrical Characteristics
LM2672-3.3
Specifications with standard type face are for T
J
= 25°C, and those in
bold type face
apply over
full
Operating Temperature Range.
Symbol
Parameter
Conditions
Typical
(Note 4)
3.3
3.3
86
Min
(Note 5)
3.251/3.201
3.251/3.201
Max
(Note 5)
3.350/3.399
3.350/3.399
Units
SYSTEM PARAMETERS
Test Circuit
Figure 2
(Note 3)
V
OUT
V
OUT
η
Output Voltage
Output Voltage
Efficiency
V
IN
= 8V to 40V, I
LOAD
= 20 mA to 1A
V
IN
= 6.5V to 40V, I
LOAD
= 20 mA to 500 mA
V
IN
= 12V, I
LOAD
= 1A
V
V
%
LM2672-5.0
Symbol
Parameter
Conditions
Typical
(Note 4)
5.0
5.0
90
Min
(Note 5)
4.925/4.850
4.925/4.850
Max
(Note 5)
5.075/5.150
5.075/5.150
Units
SYSTEM PARAMETERS
Test Circuit
Figure 2
(Note 3)
V
OUT
V
OUT
η
Output Voltage
Output Voltage
Efficiency
V
IN
= 8V to 40V, I
LOAD
= 20 mA to 1A
V
IN
= 6.5V to 40V, I
LOAD
= 20 mA to 500 mA
V
IN
= 12V, I
LOAD
= 1A
V
V
%
LM2672-12
Symbol
Parameter
Conditions
Typical
(Note 4)
12
94
Min
(Note 5)
11.82/11.64
Max
(Note 5)
12.18/12.36
Units
SYSTEM PARAMETERS
Test Circuit
Figure 2
(Note 3)
V
OUT
η
Output Voltage
Efficiency
V
IN
= 15V to 40V, I
LOAD
= 20 mA to 1A
V
IN
= 24V, I
LOAD
= 1A
V
%
LM2672-ADJ
Symbol
Parameter
Conditions
Typ
(Note 4)
1.210
Min
(Note 5)
1.192/1.174
Max
(Note 5)
1.228/1.246
Units
SYSTEM PARAMETERS
Test Circuit
Figure 3
(Note 3)
V
FB
Feedback Voltage V
IN
= 8V to 40V, I
LOAD
= 20 mA to 1A
V
OUT
Programmed for 5V
(see Circuit of
Figure 3)
V
FB
Feedback Voltage V
IN
= 6.5V to 40V, I
LOAD
= 20 mA to 500 mA
V
OUT
Programmed for 5V
(see Circuit of
Figure 3)
η
Efficiency
V
IN
= 12V, I
LOAD
= 1A
90
%
1.210
1.192/1.174
1.228/1.246
V
V
3
www.national.com
LM2672
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 V
IN
= 24V for the 12V version, and
I
LOAD
= 100 mA.
Symbol
I
Q
Parameters
Quiescent Current
V
FEEDBACK
= 8V
For 3.3V, 5.0V, and ADJ Versions
V
FEEDBACK
= 15V
For 12V Versions
I
STBY
I
CL
I
L
Standby Quiescent Current
Current Limit
Output Leakage Current
V
IN
= 40V, ON/OFF Pin = 0V
V
SWITCH
= 0V
V
SWITCH
= −1V, ON/OFF Pin = 0V
R
DS(ON)
f
O
D
I
BIAS
V
S/D
I
S/D
F
SYNC
V
SYNC
V
SS
I
SS
θ
JA
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
N Package, Junction to Ambient (Note 6)
M Package, Junction to Ambient (Note 6)
ON/OFF Pin = 0V
V
SYNC
= 3.5V, 50% duty cycle
20
400
1.4
0.63
4.5
95
105
0.53
1.5
0.73
6.9
7
37
μA
kHz
V
V
μA
°C/W
V
FEEDBACK
= 1.3V
ADJ Version Only
1.4
0.8
2.0
V
I
SWITCH
= 1A
Measured at Switch Pin
6
0.25
260
95
0
85
225
15
0.30/0.50
275
mA
Ω
kHz
%
%
nA
ON/OFF Pin = 0V
50
1.55
1
1.25/1.2
100/150
2.1/2.2
25
μA
A
μA
2.5
mA
Conditions
Typ
2.5
Min
Max
3.6
Units
mA
DEVICE PARAMETERS
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 LM2672 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
J−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.
Dear experts, I have seen many people in the forum who are new to MSP430 microcontrollers and do not know how to program, how to call each module, and how to play with low power consumption. The follo...
On the afternoon of September 28, I met a person named sunboyljp in our forum who posted a message asking for SKYPE on CE. At that time, my colleague and I made a bet: 1000 points for the transaction....
I'm begging for the 2007 B wireless identification device. Is there any relevant information about it, written by Xidian University, Min Biao, Xie Shengxiang, Zhou Tao, and the pre-competition tutor i...
In RS485 communication, when a node fails, other nodes will be affected and communication failure will occur. Is there any way to solve this problem?...
A ventilator is an instrument that can replace or assist a person's respiratory function. It is suitable for artificial respiration of patients with respiratory failure or even respiratory arrest. I...[Details]
The latest C language tools allow you to quickly complete the design of algorithm-intensive applications even if you are not proficient in hardware development.
Hardware designers have b...[Details]
Until now, designers have faced a trade-off in ADC selection. Pipeline converters offer high resolution and wide dynamic range, but their power consumption is quite high. The alternative, discrete ...[Details]
No other sector is feeling the pressure for change more acutely than the healthcare industry. Healthcare organizations and services are desperate to reduce costs, but the challenge is to do so without...[Details]
With the continuous improvement of living standards and the increase in the proportion of urban aging, the household use of medical electronic equipment has gradually become a trend. Among them, the...[Details]
Implantable Cardivoerter Defibrillators (ICDs) have been in common use for several years. ICDs apply a high voltage pulse between two electrodes connected to the heart, which detects cardiac fibrillat...[Details]
At present, a hot spot for the research and development of hearing aids abroad is concentrated in China. To be more precise, it is based on the research of Chinese language and speech, and the deve...[Details]
This article introduces a miniature home electrocardiograph. The instrument has powerful functions: display monitoring, storage, playback, printing, record management, power alarm, telephone or Intern...[Details]
Obtaining real-time and reliable traffic information has always been a bottleneck problem in the development of intelligent transportation systems. The establishment of an intelligent transportatio...[Details]
Preface
Phase-modulated pulse signals can achieve a large compression ratio. As a commonly used pulse compression signal, they are widely used in modern radar and communication systems. Wi...[Details]
1 Introduction
Generally, when transmitting information over short distances through electrical signals, baseband signals can be directly transmitted. However, over long distances, baseban...[Details]
With the improvement of people's requirements for vehicle riding comfort and the development of passenger car suspension technology in my country, air suspension is increasingly used in passenger ...[Details]
The discipline of HHCE (Home Health Care Engineering) is gradually entering people's lives as people pay more attention to health and telemedicine develops. It advocates the concept of "seeking m...[Details]
In the WTK22wtklibdevicesDefaultColorPhoneDefaultColorPhone.properties file in the WTK directory, there is a line touch_screen=false. Change it to true.
MIDP2.0 has three touch screen methods:...[Details]
Siimpel announced that its MEMS-based silicon camera technology, SiimpelFocus SF9x, has been used in Motorola's newly released MING A1600 mobile phone. The MING A1600 is the industry's first mobile...[Details]
Talking
京公网安备 11010802033920号
EEWORLD
