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LT3579IUFD-1#PBF

器件型号:LT3579IUFD-1#PBF
器件类别:电源/电源管理    电源电路   
厂商名称:Linear ( ADI )
厂商官网:http://www.analog.com/cn/index.html
标准:
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器件描述

IC REG MULT CONFIG INV ADJ 20QFN

参数
Brand NameLinear Technology
是否Rohs认证符合
厂商名称Linear ( ADI )
零件包装代码QFN
包装说明HVQCCN, LCC20,.16X.2,20
针数20
制造商包装代码UFD
Reach Compliance Codecompliant
ECCN代码EAR99
Samacsys DescriptionIC REG MULTI CONFG ADJ 6A 20QFN
模拟集成电路 - 其他类型SWITCHING REGULATOR
控制模式CURRENT-MODE
控制技术PULSE WIDTH MODULATION
最大输入电压16 V
最小输入电压2.5 V
标称输入电压5 V
JESD-30 代码R-PQCC-N20
JESD-609代码e3
长度5 mm
湿度敏感等级1
功能数量1
端子数量20
最高工作温度125 °C
最低工作温度-40 °C
最大输出电流9.4 A
封装主体材料PLASTIC/EPOXY
封装代码HVQCCN
封装等效代码LCC20,.16X.2,20
封装形状RECTANGULAR
封装形式CHIP CARRIER
峰值回流温度(摄氏度)225
认证状态Not Qualified
座面最大高度0.8 mm
表面贴装YES
切换器配置BOOST
最大切换频率2800 kHz
技术BIPOLAR
温度等级AUTOMOTIVE
端子面层Matte Tin (Sn)
端子形式NO LEAD
端子节距0.5 mm
端子位置QUAD
处于峰值回流温度下的最长时间NOT SPECIFIED
宽度4 mm
Base Number Matches1

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LT3579/LT3579-1
6A Boost/Inverting
DC/DC Converter with Fault Protection
FEATURES
n
n
n
DESCRIPTION
The
LT
®
3579
is a PWM DC/DC converter with built-in fault
protection features to aid in protecting against output shorts,
input/output overvoltage, and overtemperature conditions.
The part consists of a 42V master switch, and a 42V slave
switch that can be tied together for a total current limit of 6A.
The LT3579 is ideal for many local power supply designs. It
can be easily configured in Boost, SEPIC, Inverting, or Flyback
configurations, and is capable of generating 12V at 1.7A, or
–12V at 1.2A from a 5V input. In addition, the LT3579’s slave
switch allows the part to be configured in high voltage, high
power charge pump topologies that are very efficient and
require fewer components than traditional circuits.
The LT3579’s switching frequency range can be set bet-
ween 200kHz and 2.5MHz. The part may be clocked inter-
nally at a frequency set by the resistor from the RT pin to
ground, or it may be synchronized to an external clock.
A buffered version of the clock signal is driven out of
the CLKOUT pin, and may be used to synchronize other
compatible switching regulator ICs to the LT3579.
The LT3579 also features innovative
SHDN
pin circuitry
that allows for slowly varying input signals and an adjust-
able undervoltage lockout function. Additional features
such as frequency foldback and soft-start are integrated.
The LT3579 is available in 20-lead TSSOP and 20-pin
4mm
×
5mm QFN packages.
Efficiency and Power Loss
100
90
80
EFFICIENCY (%)
70
60
50
40
8k
0.1µF
47pF
2.2nF
35791 TA01
n
n
n
n
n
n
n
n
n
6A, 42V Combined Power Switch
Output Short Circuit Protection
Wide Input Range: 2.5V to 16V Operating,
40V Maximum Transient
LT3579-1: Dual-Phase Capable
Master/Slave (3.4A/2.6A) Switch Design
User Configurable Undervoltage Lockout
Easily Configurable as a Boost, SEPIC, Inverting, or
Flyback Converter
Low V
CESAT
Switch: 250mV at 5.5A (Typical)
Can Be Synchronized to External Clock
Can Synchronize other Switching Regulators
High Gain
SHDN
Pin Accepts Slowly Varying Input
Signals
20-Lead TSSOP and 20-Pin 4mm
×
5mm QFN
Packages
APPLICATIONS
n
n
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Local Power Supply
Vacuum Fluorescent Display (VFD) Bias Supplies
TFT-LCD Bias Supplies
Automotive Engine Control Unit (ECU) Power
All registered trademarks and trademarks are the property of their respective owners. Protected
by U.S. Patents, including 7579816.
TYPICAL APPLICATION
1MHz, 5V to 12V Boost Converter with Output Short Circuit Protection
V
IN
5V
2.2µH
10µF
FB
GATE
LT3579
CLKOUT
V
C
SS
TEMPERATURE
MONITOR
V
IN
V
OUT
12V
1.7A
130k
6.3k
10µF
3.2
2.8
2.4
POWER LOSS (W)
2.0
1.6
1.2
0.8
0.4
0
0.25 0.5 0.75 1 1.25 1.5 1.75
LOAD CURRENT (A)
2
0
SW1 SW2
22µF
100k
200k
V
IN
FAULT
SHDN
RT
SYNC GND
86.6k
30
20
35791 TA02
Document Feedback
For more information
www.analog.com
1
Rev. B
LT3579/LT3579-1
ABSOLUTE MAXIMUM RATINGS
(Note 1)
V
IN
Voltage ................................................. –0.3V to 40V
SW1/SW2 Voltage ..................................... –0.4V to 42V
R
T
Voltage .................................................... –0.3V to 5V
SS, FB Voltage ......................................... –0.3V to 2.5V
V
C
Voltage ................................................... –0.3V to 2V
SHDN
Voltage ............................................ –0.3V to 40V
SYNC Voltage............................................ –0.3V to 5.5V
GATE Voltage ............................................. –0.3V to 80V
FAULT
......................................................... –0.3V to 40V
FAULT
Current .....................................................±0.5mA
CLKOUT ....................................................... –0.3V to 3V
CLKOUT Current..................................................... ±1mA
Operating Junction Temperature Range
LT3579E (Notes 2, 4) ......................... –40°C to 125°C
LT3579I (Notes 2, 4) .......................... –40°C to 125°C
Storage Temperature Range .................. –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
FB
V
C
GATE
FAULT
V
IN
SW1
SW1
SW1
SW1
1
2
3
4
5
6
7
8
9
21
GND
20 SYNC
19 SS
18 R
T
17
SHDN
16 CLKOUT
15 SW2
14 SW2
13 SW2
12 SW2
11 SW2
GATE 1
FAULT
2
V
IN
3
SW1 4
SW1 5
SW1 6
7
SW1
8
GND
9 10
GND
SW2
21
GND
TOP VIEW
SYNC
16 R
T
15
SHDN
14 CLKOUT
13 SW2
12 SW2
11 SW2
SS
V
C
FB
20 19 18 17
SW1 10
FE PACKAGE
20-LEAD PLASTIC TSSOP
T
JMAX
= 125°C,
θ
JA
= 38°C/W,
θ
JC
= 10°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
UFD PACKAGE
20-LEAD (4mm
×
5mm) PLASTIC QFN
T
JMAX
= 125°C,
θ
JA
= 34°C/W,
θ
JC
= 2.7°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
LT3579EFE#PBF
LT3579IFE#PBF
LT3579EUFD#PBF
LT3579IUFD#PBF
LT3579EFE-1#PBF
LT3579IFE-1#PBF
LT3579EUFD-1#PBF
LT3579IUFD-1#PBF
TAPE AND REEL
LT3579EFE#TRPBF
LT3579IFE#TRPBF
LT3579EUFD#TRPBF
LT3579IUFD#TRPBF
LT3579EFE-1#TRPBF
LT3579IFE-1#TRPBF
LT3579EUFD-1#TRPBF
LT3579IUFD-1#TRPBF
PART MARKING*
LT3579FE
LT3579FE
3579
3579
LT3579FE-1
LT3579FE-1
35791
35791
PACKAGE DESCRIPTION
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
20-Lead (4mm
×
5mm) Plastic QFN
20-Lead (4mm
×
5mm) Plastic QFN
20-Lead Plastic TSSOP
20-Lead Plastic TSSOP
20-Lead (4mm
×
5mm) Plastic QFN
20-Lead (4mm
×
5mm) Plastic QFN
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Tape and reel specifications.
Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
2
Rev. B
For more information
www.analog.com
LT3579/LT3579-1
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
SHDN
= V
IN,
V
FAULT
=
V
IN
unless otherwise noted. (Note 2).
PARAMETER
Minimum Input Voltage
V
IN
Overvoltage Lockout
Positive Feedback Voltage
Negative Feedback Voltage
Positive FB Pin Bias Current
Negative FB Pin Bias Current
Error Amp Transconductance
Error Amp Voltage Gain
Quiescent Current
Quiescent Current in Shutdown
Reference Line Regulation
Switching Frequency, f
OSC
Switching Frequency in Foldback
Switching Frequency Range
SYNC High Level for Sync
SYNC Low Level for Sync
SYNC Clock Pulse Duty Cycle
Recommended Minimum SYNC Ratio
f
SYNC
/f
OSC
Minimum Off-Time
Minimum On-Time
SW1 Current Limit
SW Current Sharing, I
SW2
/I
SW1
SW1 + SW2 Current Limit
Switch V
CESAT
SW1 Leakage Current
SW2 Leakage Current
At All Duty Cycles (Note 3)
SW1 and SW2 Tied Together
I
SW2
/I
SW1
= 0.78, At All Duty Cycles (Note 3)
SW1 and SW2 Tied Together, I
SW1
+ I
SW2
= 5.5A (Note 5)
V
SW1
= 5V
V
SW2
= 5V
l
l
l
l
ELECTRICAL CHARACTERISTICS
CONDITIONS
MIN
l
TYP
2.3
18.7
1.215
9
83.3
83.3
250
70
1.9
0
0.01
MAX
2.5
21.2
1.230
16
85
85.5
UNITS
V
V
V
mV
µA
µA
µmhos
V/V
16.2
1.195
3
80.5
81
V
FB
=Positive Feedback Voltage, Current into Pin
V
FB
=Negative Feedback Voltage, Current out of Pin
ΔI=10μA
Not Switching
V
SHDN
= 0V
2.5V ≤ V
IN
≤ 15V
R
T
= 34kΩ
R
T
= 432kΩ
Compared to Normal f
OSC
Free-Running or Synchronizing
l
l
2.4
1
0.05
2.8
225
2500
0.4
mA
µA
%/V
MHz
kHz
ratio
kHz
V
V
%
l
l
2.2
175
200
1.3
20
2.5
200
1/6
l
l
l
V
SYNC
= 0V to 2V
80
3/4
45
55
nS
nS
5.1
9.4
350
1
1
A
A/A
A
mV
µA
µA
3.4
6
4.2
0.78
7.5
250
0.01
0.01
For more information
www.analog.com
3
Rev. B
LT3579/LT3579-1
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 5V, V
SHDN
= V
IN
, V
FAULT
=
V
IN
unless otherwise noted. (Note 2).
PARAMETER
Soft-Start Charge Current
Soft-Start Discharge Current
CONDITIONS
V
SS
= 30mV, Current Flows Out of SS pin
Part in FAULT
V
SS
= 2.1V,
Current Flows into SS Pin
Part in FAULT
Part Exiting FAULT
Active Mode,
SHDN
Rising
Active Mode,
SHDN
Falling
Shutdown Mode
V
SHDN
= 3V
V
SHDN
= 1.3V
V
SHDN
= 0V
C
CLKOUT
= 50pF
C
CLKOUT
= 50pF
LT3579, T
J
= 25°C
LT3579-1, All T
J
CLKOUT Rise Time
CLKOUT Fall Time
GATE Pull Down Current
GATE Leakage Current
FAULT
Output Voltage Low
FAULT
Leakage Current
FAULT
Input Voltage Low Threshold
FAULT
Input Voltage High Threshold
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2:
The LT3579E is guaranteed to meet performance specifications
from 0°C to 125°C junction temperature. Specifications over the –40°C
to 125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LT3579I is guaranteed over the full –40°C to 125°C operating junction
temperature range.
C
CLKOUT
= 50pF
C
CLKOUT
= 50pF
V
GATE
= 3V
V
GATE
= 80V
V
GATE
= 50V, GATE Off
50μA into
FAULT
Pin
V
FAULT
= 40V,
FAULT
Off
l
l
l
l
l
l
l
l
l
l
l
l
ELECTRICAL CHARACTERISTICS
MIN
5.7
5.7
1.65
30
1.27
1.24
TYP
8.7
8.7
1.8
50
1.33
1.3
40
11.4
0
2.1
100
42
50
12
8
MAX
11.3
11.3
1.95
85
1.41
1.38
.3
60
13.4
0.1
2.3
200
UNITS
µA
µA
V
mV
V
V
V
µA
µA
µA
V
mV
%
%
ns
ns
Soft-Start High Detection Voltage
Soft-Start Low Detection Voltage
SHDN
Minimum Input Voltage High
SHDN
Input Voltage Low
SHDN
Pin Bias Current
9.5
1.9
CLKOUT Output Voltage High
CLKOUT Output Voltage Low
CLKOUT Duty Cycle
800
800
933
933
0.01
100
0.01
1100
1100
1
300
1
800
1050
µA
µA
µA
mV
µA
mV
mV
700
950
750
1000
Note 3:
Current limit guaranteed by design and/or correlation to static test.
Note 4:
This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation over the specified maximum operating junction
temperature may impair device reliability.
Note 5:
The UFD package switch V
CESAT
is guaranteed by design,
characterization and bench correlation.
4
Rev. B
For more information
www.analog.com
LT3579/LT3579-1
TYPICAL PERFORMANCE CHARACTERISTICS
Switch Current Limit
10
9
SATURATION VOLTAGE (mV)
SW1 + SW2 CURRENT (A)
8
7
6
5
4
3
2
1
0
20
30
40
50
60
DUTY CYCLE (%)
70
80
35791 G01
T
A
= 25°C, unless otherwise noted.
Switch Saturation Voltage
350
300
250
I
SW2
/I
SW1
(A/A)
200
150
100
50
0
0
1
2
3
4
5
6
SW1 + SW2 CURRENT (A)
7
8
V
SW1
= V
SW2
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
Switch Current Sharing
0
0.5
1
1.5 2 2.5 3
SW1 CURRENT (A)
3.5
4
35791 G02
35791 G03
Switch Current Limit
vs Temperature
10
9
SW1 + SW2 CURRENT (A)
SW1 + SW2 CURRENT (A)
8
7
6
5
4
3
2
1
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
35791 G04
Commanded Switch Current vs SS
10
9
8
FB VOLTAGE (V)
7
6
5
4
3
2
1
0
0
0.2
0.4
0.6
0.8
SS VOLTAGE (V)
1
1.2
35791 G05
Positive Feedback Voltage
1.23
1.225
1.22
1.215
1.21
1.205
1.2
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
35791 G06
3.0
2.8
2.6
2.4
2.2
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
–50 –25
NORMALIZED OSCILLATOR FREQUENCY (F
SW
/F
NOM
)
Oscillator Frequency
Oscillator Frequency During
Soft-Start
1
80
70
CLKOUT DUTY CYCLE (%)
60
50
40
30
20
CLKOUT Duty Cycle
R
T
= 34k
FREQUENCY (MHz)
1/2
1/3
1/4
1/5
1/6
0
R
T
= 432k
0
25 50 75 100 125 150
TEMPERATURE (°C)
35791 G07
INVERTING
CONFIGURATIONS
0
0.2
BOOSTING
CONFIGURATIONS
1
1.2
35791 G08
0.4
0.6
0.8
FB VOLTAGE (V)
0
–50 –25
0
25 50 75 100 125 150
TEMPERATURE (°C)
35791 G09
For more information
www.analog.com
5
Rev. B

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