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LM2679SDX-5.0

IC 8.1 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14, LLP-14, Switching Regulator or Controller

器件类别：电源/电源管理    电源电路   

厂商名称：National Semiconductor（TI ）

厂商官网：http://www.ti.com

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参数 预览 参数对比
器件参数
参数名称
属性值
是否Rohs认证
不符合
厂商名称
National Semiconductor（TI ）
包装说明
LLP-14
Reach Compliance Code
not_compliant
ECCN代码
EAR99
模拟集成电路 - 其他类型
SWITCHING REGULATOR
控制模式
VOLTAGE-MODE
控制技术
PULSE WIDTH MODULATION
最大输入电压
40 V
最小输入电压
8 V
标称输入电压
12 V
JESD-30 代码
R-XDSO-N14
JESD-609代码
e0
长度
6 mm
湿度敏感等级
1
功能数量
1
端子数量
14
最高工作温度
125 °C
最低工作温度
-40 °C
最大输出电流
8.1 A
封装主体材料
UNSPECIFIED
封装代码
HVSON
封装等效代码
SOLCC14,.2,32
封装形状
RECTANGULAR
封装形式
SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）
260
认证状态
Not Qualified
座面最大高度
1 mm
表面贴装
YES
切换器配置
BUCK
最大切换频率
280 kHz
温度等级
AUTOMOTIVE
端子面层
Tin/Lead (Sn/Pb)
端子形式
NO LEAD
端子节距
0.8 mm
端子位置
DUAL
处于峰值回流温度下的最长时间
40
宽度
5 mm
Base Number Matches
1
文档预览
LM2679 SIMPLE SWITCHER 5A Step-Down Voltage Regulator with Adjustable Current Limit
October 2003
LM2679
SIMPLE SWITCHER
®
5A Step-Down Voltage Regulator
with Adjustable Current Limit
General Description
The LM2679 series of regulators are monolithic integrated
circuits which provide all of the active functions for a step-
down (buck) switching regulator capable of driving up to 5A
loads with excellent line and load regulation characteristics.
High efficiency (
>
90%) is obtained through the use of a low
ON-resistance DMOS power switch. The series consists of
fixed output voltages of 3.3V, 5V and 12V and an adjustable
output version.
The SIMPLE SWITCHER concept provides for a complete
design using a minimum number of external components. A
high fixed frequency oscillator (260KHz) allows the use of
physically smaller sized components. A family of standard
inductors for use with the LM2679 are available from several
manufacturers to greatly simplify the design process.
Other features include the ability to reduce the input surge
current at power-ON by adding a softstart timing capacitor to
gradually turn on the regulator. The LM2679 series also has
built in thermal shutdown and resistor programmable current
limit of the power MOSFET switch to protect the device and
load circuitry under fault conditions. The output voltage is
guaranteed to a
±
2% tolerance. The clock frequency is
controlled to within a
±
11% tolerance.
Features
n
Efficiency up to 92%
n
Simple and easy to design with (using off-the-shelf
external components)
n
Resistor programmable peak current limit over a range
of 3A to 7A.
n
120 mΩ DMOS output switch
n
3.3V, 5V and 12V fixed output and adjustable (1.2V to
37V ) versions
n
±
2%maximum output tolerance over full line and load
conditions
n
Wide input voltage range: 8V to 40V
n
260 KHz fixed frequency internal oscillator
n
Softstart capability
n
−40 to +125˚C operating junction temperature range
Applications
n
Simple to design, high efficiency (
>
90%) step-down
switching regulators
n
Efficient system pre-regulator for linear voltage
regulators
n
Battery chargers
Typical Application
10084703
SIMPLE SWITCHER
®
is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation
DS100847
www.national.com
LM2679
Connection Diagrams and Ordering Information
TO-263 Package
Top View
TO-220 Package
Top View
10084701
10084702
Order Number
LM2679S-3.3, LM2679S-5.0,
LM2679S-12 or LM2679S-ADJ
See NSC Package Number TS7B
Top View
Order Number
LM2679T-3.3, LM2679T-5.0,
LM2679T-12 or LM2679T-ADJ
See NSC Package Number TA07B
10084735
LLP-14
See NS package Number SRC14A
Ordering Information for LLP Package
Output Voltage
12
12
3.3
3.3
5.0
5.0
ADJ
ADJ
Order Information
LM2679SD-12
LM2679SDX-12
LM2679SD-3.3
LM2679SDX-3.3
LM2679SD-5.0
LM2679SDX-5.0
LM2679SD-ADJ
LM2679SDX-ADJ
Package Marking
S0003FB
S0003FB
S0003HB
S0003HB
S0003JB
S0003JB
S0003KB
S0003KB
Supplied As
250 Units on Tape and Reel
2500 Units on Tape and Reel
250 Units on Tape and Reel
2500 Units on Tape and Reel
250 Units on Tape and Reel
2500 Units on Tape and Reel
250 Units on Tape and Reel
2500 Units on Tape and Reel
www.national.com
2
LM2679
Absolute Maximum Ratings
(Note 1)
Storage Temperature Range
Soldering Temperature
Wave
Infrared
Vapor Phase
−65˚C to 150˚C
4 sec, 260˚C
10 sec, 240˚C
75 sec, 219˚C
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Supply Voltage
Softstart Pin Voltage
Switch Voltage to Ground
Boost Pin Voltage
Feedback Pin Voltage
Power Dissipation
ESD (Note 2)
45V
−0.1V to 6V
−1V to V
IN
V
SW
+ 8V
−0.3V to 14V
Internally Limited
2 kV
Operating Ratings
Supply Voltage
Junction Temperature Range (T
J
)
8V to 40V
−40˚C to 125˚C
Electrical Characteristics
LM2679-3.3
Symbol
V
OUT
η
Parameter
Output Voltage
Efficiency
Limits appearing in
bold type face
apply over the entire junction temperature
range of operation, −40˚C to 125˚C. Specifications appearing in normal type apply for T
A
= T
J
= 25˚C. R
ADJ
= 5.6KΩ
Conditions
V
IN
= 8V to 40V, 100mA
≤
I
OUT
≤
5A
V
IN
= 12V, I
LOAD
= 5A
Typical
(Note 3)
3.3
82
Min
(Note 4)
3.234/3.201
Max
(Note 4)
3.366/3.399
Units
V
%
LM2679-5.0
Symbol
V
OUT
η
Parameter
Output Voltage
Efficiency
Conditions
V
IN
= 8V to 40V, 100mA
≤
I
OUT
≤
5A
V
IN
= 12V, I
LOAD
= 5A
Typical
(Note 3)
5.0
84
Min
(Note 4)
4.900/4.850
Max
(Note 4)
5.100/5.150
V
%
Units
LM2679-12
Symbol
V
OUT
η
Parameter
Output Voltage
Efficiency
Conditions
V
IN
= 15V to 40V, 100mA
≤
I
OUT
≤
5A
V
IN
= 24V, I
LOAD
= 5A
Typical
(Note 3)
12
92
Min
(Note 4)
11.76/11.64
Max
(Note 4)
12.24/12.36
V
%
Units
LM2679-ADJ
Symbol
V
FB
η
Parameter
Feedback
Voltage
Efficiency
Conditions
V
IN
= 8V to 40V, 100mA
≤
I
OUT
≤
5A
V
OUT
Programmed for 5V
V
IN
= 12V, I
LOAD
= 5A
Typ
(Note 3)
1.21
84
Min
(Note 4)
1.186/1.174
Max
(Note 4)
1.234/1.246
V
%
Units
3
www.national.com
LM2679
All Output Voltage Versions
Electrical Characteristics
Limits appearing in
bold type face
apply over the entire junction temperature range of operation, −40˚C to 125˚C. Specifica-
tions appearing in normal type apply for T
A
= T
J
= 25˚C. Unless otherwise specified V
IN
=12V for the 3.3V, 5V and Adjustable
versions and V
IN
=24V for the 12V version.
Symbol
I
Q
Parameter
Quiescent
Current
V
FEEDBACK
= 8V
For 3.3V, 5.0V, and ADJ Versions
V
FEEDBACK
= 15V
For 12V Versions
V
ADJ
I
CL
I
L
Current Limit
Adjust Voltage
Current Limit
Output Leakage
Current
Switch
On-Resistance
Oscillator
Frequency
Duty Cycle
Feedback Bias
Current
Softstart
Threshold
Voltage
Softstart Pin
Current
Thermal
Resistance
Softstart Pin = 0V
T Package, Junction to Ambient
(Note 6)
T Package, Junction to Ambient
(Note 7)
θ
JC
θ
JA
θ
JA
θ
JA
θ
JC
θ
JA
θ
JA
T Package, Junction to Case
S Package, Junction to Ambient
(Note 8)
S Package, Junction to Ambient
(Note 9)
S Package, Junction to Ambient
(Note 10)
S Package, Junction to Case
SD Package, Junction to Ambient
(Note 11)
SD Package, Junction to Ambient
(Note 12)
29
2
55
˚C/W
++
26
35
2
56
˚C/W
45
R
ADJ
= 5.6KΩ, (Note 5)
V
IN
= 40V, Softstart Pin = 0V
V
SWITCH
= 0V
V
SWITCH
= −1V
I
SWITCH
= 5A
Measured at Switch Pin
Maximum Duty Cycle
Minimum Duty Cycle
I
BIAS
V
SFST
V
FEEDBACK
= 1.3V
ADJ Version Only
1.21
6.3
1.0
6
0.12
260
91
0
85
225
1.181/1.169
5.5/5.3
1.229/1.246
7.6/8.1
1.5
15
0.14/0.225
280
V
A
mA
mA
Ω
kHz
%
%
nA
Conditions
Typ
4.2
Min
Max
6
Units
mA
DEVICE PARAMETERS
R
DS(ON)
f
O
D
0.63
0.53
0.74
V
I
SFST
θ
JA
θ
JA
3.7
65
6.9
µA
www.national.com
4
LM2679
All Output Voltage Versions
Electrical Characteristics
(Continued)
Note 1:
Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings indicate conditions under which of the device is
guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test condition, see the electrical
Characteristics tables.
Note 2:
ESD was applied using the human-body model, a 100pF capacitor discharged through a 1.5 kΩ resistor into each pin.
Note 3:
Typical values are determined with T
A
= T
J
= 25˚C and represent the most likely norm.
Note 4:
All limits are guaranteed at room temperature (standard type face) and at
temperature extremes (bold type face).
All room temperature limits are 100%
tested during production with T
A
= T
J
= 25˚C. All limits at temperature extremes are guaranteed via correlation using standard standard Quality Control (SQC)
methods. All limits are used to calculate Average Outgoing Quality Level (AOQL).
Note 5:
The peak switch current limit is determined by the following relationship: I
CL
=37,125/ R
ADJ
.
Note 6:
Junction to ambient thermal resistance (no external heat sink) for the 7 lead TO-220 package mounted vertically, with
1
⁄
2
inch leads in a socket, or on a PC
board with minimum copper area.
Note 7:
Junction to ambient thermal resistance (no external heat sink) for the 7 lead TO-220 package mounted vertically, with
1
⁄
2
inch leads soldered to a PC board
containing approximately 4 square inches of (1 oz.) copper area surrounding the leads.
Note 8:
Junction to ambient thermal resistance for the 7 lead TO-263 mounted horizontally against a PC board area of 0.136 square inches (the same size as the
TO-263 package) of 1 oz. (0.0014 in. thick) copper.
Note 9:
Junction to ambient thermal resistance for the 7 lead TO-263 mounted horizontally against a PC board area of 0.4896 square inches (3.6 times the area
of the TO-263 package) of 1 oz. (0.0014 in. thick) copper.
Note 10:
Junction to ambient thermal resistance for the 7 lead TO-263 mounted horizontally against a PC board copper area of 1.0064 square inches (7.4 times
the area of the TO-263 package) of 1 oz. (0.0014 in. thick) copper. Additional copper area will reduce thermal resistance further. See the thermal model in Switchers
Made Simple
®
software.
Note 11:
Junction to ambient thermal resistance for the 14-lead LLP mounted on a PC board copper area equal to the die attach paddle.
Note 12:
Junction to ambient thermal resistance for the 14-lead LLP mounted on a PC board copper area using 12 vias to a second layer of copper equal to die
attach paddle. Additional copper area will reduce thermal resistance further. For layout recommendations, refer to Application Note AN-1187.
5
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参数对比
与LM2679SDX-5.0相近的元器件有：LM2679SD-3.3、LM2679SD-5.0、LM2679SDX-3.3、LM2679SDX-ADJ、LM2679SX-ADJ、LM2679SX-5.0、LM2679SX-3.3。描述及对比如下：
型号 LM2679SDX-5.0 LM2679SD-3.3 LM2679SD-5.0 LM2679SDX-3.3 LM2679SDX-ADJ LM2679SX-ADJ LM2679SX-5.0 LM2679SX-3.3
描述 IC 8.1 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14, LLP-14, Switching Regulator or Controller IC 8.1 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14, LLP-14, Switching Regulator or Controller IC 8.1 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14, LLP-14, Switching Regulator or Controller IC 8.1 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14, LLP-14, Switching Regulator or Controller IC 8.1 A SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, DSO14, LLP-14, Switching Regulator or Controller IC SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PSSO7, POWER, TO-263, SMT-7, Switching Regulator or Controller IC SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PSSO7, POWER, TO-263, SMT-7, Switching Regulator or Controller IC SWITCHING REGULATOR, 280 kHz SWITCHING FREQ-MAX, PSSO7, POWER, TO-263, SMT-7, Switching Regulator or Controller
是否Rohs认证 不符合 不符合 不符合 不符合 不符合 不符合 不符合 不符合
厂商名称 National Semiconductor（TI ） National Semiconductor（TI ） National Semiconductor（TI ） National Semiconductor（TI ） National Semiconductor（TI ） National Semiconductor（TI ） National Semiconductor（TI ） National Semiconductor（TI ）
包装说明 LLP-14 LLP-14 LLP-14 LLP-14 LLP-14 POWER, TO-263, SMT-7 POWER, TO-263, SMT-7 POWER, TO-263, SMT-7
Reach Compliance Code not_compliant not_compliant not_compliant not_compliant not_compliant not_compliant not_compliant not_compliant
ECCN代码 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99 EAR99
模拟集成电路 - 其他类型 SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR SWITCHING REGULATOR
控制模式 VOLTAGE-MODE VOLTAGE-MODE VOLTAGE-MODE VOLTAGE-MODE VOLTAGE-MODE CURRENT-MODE CURRENT-MODE CURRENT-MODE
控制技术 PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION PULSE WIDTH MODULATION
最大输入电压 40 V 40 V 40 V 40 V 40 V 40 V 40 V 40 V
最小输入电压 8 V 8 V 8 V 8 V 8 V 8 V 8 V 8 V
JESD-30 代码 R-XDSO-N14 R-XDSO-N14 R-XDSO-N14 R-XDSO-N14 R-XDSO-N14 R-PSSO-G7 R-PSSO-G7 R-PSSO-G7
JESD-609代码 e0 e0 e0 e0 e0 e0 e0 e0
长度 6 mm 6 mm 6 mm 6 mm 6 mm 10.16 mm 10.16 mm 10.16 mm
湿度敏感等级 1 1 1 1 1 3 3 3
功能数量 1 1 1 1 1 1 1 1
端子数量 14 14 14 14 14 7 7 7
最大输出电流 8.1 A 8.1 A 8.1 A 8.1 A 8.1 A 5 A 5 A 5 A
封装主体材料 UNSPECIFIED UNSPECIFIED UNSPECIFIED UNSPECIFIED UNSPECIFIED PLASTIC/EPOXY PLASTIC/EPOXY PLASTIC/EPOXY
封装代码 HVSON HVSON HVSON HVSON HVSON TO-263 TO-263 TO-263
封装等效代码 SOLCC14,.2,32 SOLCC14,.2,32 SOLCC14,.2,32 SOLCC14,.2,32 SOLCC14,.2,32 SMSIP7H,.55,50TB SMSIP7H,.55,50TB SMSIP7H,.55,50TB
封装形状 RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR RECTANGULAR
封装形式 SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE SMALL OUTLINE SMALL OUTLINE SMALL OUTLINE
峰值回流温度（摄氏度） 260 260 260 260 260 235 235 235
认证状态 Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified Not Qualified
座面最大高度 1 mm 1 mm 1 mm 1 mm 1 mm 4.8 mm 4.8 mm 4.8 mm
表面贴装 YES YES YES YES YES YES YES YES
切换器配置 BUCK BUCK BUCK BUCK BUCK BUCK BUCK BUCK
最大切换频率 280 kHz 280 kHz 280 kHz 280 kHz 280 kHz 280 kHz 280 kHz 280 kHz
端子面层 Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb) Tin/Lead (Sn/Pb)
端子形式 NO LEAD NO LEAD NO LEAD NO LEAD NO LEAD GULL WING GULL WING GULL WING
端子节距 0.8 mm 0.8 mm 0.8 mm 0.8 mm 0.8 mm 1.27 mm 1.27 mm 1.27 mm
端子位置 DUAL DUAL DUAL DUAL DUAL SINGLE SINGLE SINGLE
处于峰值回流温度下的最长时间 40 40 40 40 40 30 30 30
宽度 5 mm 5 mm 5 mm 5 mm 5 mm 8.635 mm 8.635 mm 8.635 mm
标称输入电压 12 V 12 V 12 V 12 V 12 V - - -
最高工作温度 125 °C 125 °C 125 °C 125 °C 125 °C - - -
最低工作温度 -40 °C -40 °C -40 °C -40 °C -40 °C - - -
温度等级 AUTOMOTIVE AUTOMOTIVE AUTOMOTIVE AUTOMOTIVE AUTOMOTIVE - - -
Base Number Matches 1 1 1 1 1 - - -
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器件捷径:
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