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Linear Technology Electronic Components Datasheet

LT3580 Datasheet

Boost/Inverting DC/DC Converter

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LT3580
Boost/Inverting DC/DC
Converter with 2A Switch,
Soft-Start, and Synchronization
FEATURES
n 2A Internal Power Switch
n Adjustable Switching Frequency
n Single Feedback Resistor Sets VOUT
n Synchronizable to External Clock
n High Gain SHDN Pin Accepts Slowly Varying
Input Signals
n Wide Input Voltage Range: 2.5V to 32V
n Low VCESAT Switch: 300mV at 1.5A (Typical)
n Integrated Soft-Start Function
n Easily Configurable as a Boost or Inverting Converter
n User Configurable Undervoltage Lockout (UVLO)
n Tiny 8-Lead 3mm × 3mm DFN and 8-Lead MSOP
Packages
APPLICATIONS
n VFD Bias Supplies
n TFT-LCD Bias Supplies
n GPS Receivers
n DSL Modems
n Local Power Supply
DESCRIPTION
The LT®3580 is a PWM DC/DC converter containing an
internal 2A, 42V switch. The LT3580 can be configured
as either a boost, SEPIC or inverting converter. Capable
of generating 12V at 550mA or –12V at 350mA from a
5V input, the LT3580 is ideal for many local power supply
designs.
The LT3580 has an adjustable oscillator, set by a resistor
from the RT pin to ground. Additionally, the LT3580 can
be synchronized to an external clock. The free running or
synchronized switching frequency range of the part can
be set between 200kHz and 2.5MHz.
The LT3580 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 LT3580 is available in tiny
3mm × 3mm 8-lead DFN and 8-lead MSOP packages.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation. All other
trademarks are the property of their respective owners.
TYPICAL APPLICATION
1.2MHz, 5V to 12V Boost Converter Achieves Over 88% Efficiency
4.2μH
VIN
5V
VOUT
12V
550mA
VIN SW
10μF
SHDN
GND
LT3580
130k
RT FB
SYNC
2.2μF 75k
VC
SS
0.1μF
10k
1nF
3580 TA01
Efficiency and Power Loss
95 1200
90
1000
85
80 800
75
600
70
65 400
60
200
55
50
0
100 200 300 400 500
LOAD CURRENT (mA)
0
600
3580 TA01b
3580fg
1


Linear Technology Electronic Components Datasheet

LT3580 Datasheet

Boost/Inverting DC/DC Converter

No Preview Available !

LT3580
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN Voltage................................................. –0.3V to 32V
SW Voltage ................................................ –0.4V to 42V
RT Voltage ................................................... –0.3V to 5V
SS and FB Voltage .................................... –0.3V to 2.5V
VC Voltage ................................................... –0.3V to 2V
SHDN Voltage ............................................ –0.3V to 32V
SYNC Voltage............................................ –0.3V to 5.5V
Operating Junction Temperature Range
LT3580E (Notes 2, 5)......................... –40°C to 125°C
LT3580I (Notes 2, 5).......................... –40°C to 125°C
LT3580H (Notes 2, 5) ........................–40°C to 150°C
LT3580MP (Notes 2, 5) ..................... –55°C to 125°C
Storage Temperature Range ..................–65°C to 150°C
PIN CONFIGURATION
TOP VIEW
FB 1
8 SYNC
VC 2 9 7 SS
VIN 3 GND 6 RT
SW 4
5 SHDN
DD PACKAGE
8-LEAD (3mm s 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
FB 1
8 SYNC
VC 2 9 7 SS
VIN 3 GND 6 RT
SW 4
5 SHDN
MS8E PACKAGE
8-LEAD PLASTIC MSOP
θJA = 35°C/W TO 40°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3580EDD#PBF
LT3580EDD#TRPBF
LCXY
8-Lead (3mm × 3mm) Plastic DFN
– 40°C to 125°C
LT3580IDD#PBF
LT3580IDD#TRPBF
LCXY
8-Lead (3mm × 3mm) Plastic DFN
– 40°C to 125°C
LT3580EMS8E#PBF
LT3580EMS8E#TRPBF LTDCJ
8-Lead Plastic MSOP
– 40°C to 125°C
LT3580IMS8E#PBF
LT3580IMS8E#TRPBF LTDCJ
8-Lead Plastic MSOP
– 40°C to 125°C
LT3580HMS8E#PBF
LT3580HMS8E#TRPBF LTDCJ
8-Lead Plastic MSOP
– 40°C to 150°C
LT3580MPMS8E#PBF
LT3580MPMS8E#TRPBF LTDCJ
8-Lead Plastic MSOP
– 55°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
3580fg
2


Part Number LT3580
Description Boost/Inverting DC/DC Converter
Maker Linear Technology
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LT3580 Datasheet PDF






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