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Linear Technology Electronic Components Datasheet

LT3502A Datasheet

1.1MHz/2.2MHz 500mA Step-Down Regulators

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FEATURES
3V to 40V Input Voltage Range
500mA Output Current
Switching Frequency: 2.2MHz (LT3502A),
1.1MHz (LT3502)
800mV Feedback Voltage
Short-Circuit Robust
Soft-Start
Low Shutdown Current: <2μA
Internally Compensated
Internal Boost Diode
Thermally Enhanced 2mm × 2mm 8-Lead DFN
and 10-lead MS10 Package
APPLICATIONS
Automotive Systems
Battery-Powered Equipment
Wall Transformer Regulation
Distributed Supply Regulation
LT3502/LT3502A
1.1MHz/2.2MHz, 500mA
Step-Down Regulators in
2mm × 2mm DFN and MS10
DESCRIPTION
The LT®3502/LT3502A are current mode PWM step-down
DC/DC converters with an internal 500mA power switch,
in tiny 8-lead 2mm × 2mm DFN and 10-lead MS10
packages. The wide input voltage range of 3V to 40V makes
the LT3502/LT3502A suitable for regulating power from a
wide variety of sources, including 24V industrial supplies
and automotive batteries. Its high operating frequency
allows the use of tiny, low cost inductors and capacitors,
resulting in a very small solution. Constant frequency
above the AM band avoids interfering with radio reception,
making the LT3502A particularly suitable for automotive
applications.
Cycle-by-cycle current limit and frequency foldback
provide protection against shorted outputs. Soft-start
and frequency foldback eliminates input current surge
during start-up. DA current sense provides further protec-
tion in fault conditions. An internal boost diode reduces
component count.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
3.3V Step-Down Converter
VIN
4.7V TO 40V
BD
VIN BOOST
1μF
SW
LT3502A
DA
OFF ON
SHDN
FB
GND
0.1μF 6.8μH
VOUT
3.3V
500mA
31.6k
10k
10μF
3502 TA01a
LT3502A 12VIN Efficiency
90
80
5VOUT
3.3VOUT
70
60
50
40
30
20
10
0
0 0.1 0.2 0.3 0.4 0.5
LOAD CURRENT (A)
3502 TA01b
3502fc
1


Linear Technology Electronic Components Datasheet

LT3502A Datasheet

1.1MHz/2.2MHz 500mA Step-Down Regulators

No Preview Available !

wwwL.DTata3Sh5ee0t4U2.co/mLT3502A
ABSOLUTE MAXIMUM RATINGS (Note 1)
Input Voltage (VIN)....................................................40V
BOOST Voltage .........................................................50V
BOOST Pin Above SW Pin...........................................7V
FB Voltage...................................................................6V
SHDN Voltage ...........................................................40V
BD Voltage ..................................................................7V
Operating Junction Temperature Range (Note 2)
LT3502AE, LT3502E ...........................–40°C to 125°C
LT3502AI, LT3502I.............................–40°C to 125°C
Storage Temperature Range...................–65°C to 150°C
PIN CONFIGURATION
TOP VIEW
VIN 1
8 SW
BD 2
7 BOOST
9
FB 3
6 DA
SHDN 4
5 GND
DC PACKAGE
8-LEAD (2mm × 2mm) PLASTIC DFN
θJA = 102°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
SW 1
BOOST 2
NC 3
DA 4
GND 5
TOP VIEW
10 VIN
9 NC
8 BD
7 FB
6 SHDN
MS PACKAGE
10-LEAD PLASTIC MSOP
θJA = 110°C/W
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3502EDC#PBF
LT3502EDC#TRPBF
LCLV
8-Lead 2mm × 2mm Plastic DFN
–40°C to 125°C
LT3502IDC#PBF
LT3502IDC#TRPBF
LCLV
8-Lead 2mm × 2mm Plastic DFN
–40°C to 125°C
LT3502AEDC#PBF
LT3502AEDC#TRPBF
LCLT
8-Lead 2mm × 2mm Plastic DFN
–40°C to 125°C
LT3502AIDC#PBF
LT3502AIDC#TRPBF
LCLT
8-Lead 2mm × 2mm Plastic DFN
–40°C to 125°C
LT3502EMS#PBF
LT3502EMS#TRPBF
LTDTR
10-Lead Plastic MSOP
–40°C to 125°C
LT3502IMS#PBF
LT3502IMS#TRPBF
LTDTR
10-Lead Plastic MSOP
–40°C to 125°C
LT3502AEMS#PBF
LT3502AEMS#TRPBF
LTDTS
10-Lead Plastic MSOP
–40°C to 125°C
LT3502AIMS#PBF
LT3502AIMS#TRPBF
LTDTS
10-Lead Plastic MSOP
–40°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/
3502fc
2


Part Number LT3502A
Description 1.1MHz/2.2MHz 500mA Step-Down Regulators
Maker Linear Technology
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LT3502A Datasheet PDF






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