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LT3502AEMS#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT3502/LT3502A
1
3502fd
Features
applications
Description
1.1MHz/2.2MHz, 500mA
Step-Down Regulators in
2mm ×
2mm DFN and MS10
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.
3.3V Step-Down Converter
n
3V to 40V Input Voltage Range
n
500mA Output Current
n
Switching Frequency: 2.2MHz (LT3502A),
1.1MHz (LT3502)
n
800mV Feedback Voltage
n
Short-Circuit Robust
n
Soft-Start
n
Low Shutdown Current: <2µA
n
Internally Compensated
n
Internal Boost Diode
n
Thermally Enhanced 2mm × 2mm 8-Lead DFN
and 10-Lead MS10 Package
n
Automotive Systems
n
Battery-Powered Equipment
n
Wall Transformer Regulation
n
Distributed Supply Regulation
LT3502A 12V
IN
Efficiency
V
IN
0.1µF
3502 TA01a
31.6k
10k
6.8µH
SHDN
BOOST
SW
LT3502A
BD
GND
DA
FB
OFF ON
10µF
1µF
V
IN
4.7V TO 40V
V
OUT
3.3V
500mA
LOAD CURRENT (A)
0
0
EFFICIENCY (%)
10
30
40
50
0.2
0.4
0.5
90
3502 TA01b
20
0.1 0.3
60
70
80
3.3V
OUT
5V
OUT
typical application
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
LT3502/LT3502A
2
3502fd
pin conFiguration
absolute MaxiMuM ratings
Input Voltage (V
IN
) .................................................... 40V
BOOST Voltage .........................................................50V
BOOST Pin Above SW Pin ...........................................7V
FB Voltage ................................................................... 6V
SHDN Voltage ...........................................................40V
(Note 1)
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/
TOP VIEW
V
IN
BD
FB
SHDN
SW
BOOST
DA
GND
DC PACKAGE
8-LEAD (2mm × 2mm) PLASTIC DFN
9
4
1
2
3
6
5
7
8
θ
JA
= 102°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
5
SW
BOOST
NC
DA
GND
10
9
8
7
6
V
IN
NC
BD
FB
SHDN
TOP VIEW
MS PACKAGE
10-LEAD PLASTIC MSOP
θ
JA
= 110°C/W
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
LT3502/LT3502A
3
3502fd
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 LT3502EDC and LT3502AEDC are guaranteed to meet
performance specifications from 0°C to 125°C junction temperature
range. Specifications over the –40°C to 125°C operating junction
temperature range are assured by design, characterization and correlation
electrical characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
SHDN
= 5V, V
BOOST
= 15V.
with statistical process controls. The LT3502IDC and LT3502AIDC are
guaranteed over the – 40°C to 125°C operating junction temperature
range.
Note 3: Current limit guaranteed by design and/or correlation to static test.
Slope compensation reduces current limit at higher duty cycle.
Note 4: Current flows into pin.
Note 5: Current flows out of pin.
PARAMETER CONDITIONS MIN TYP MAX UNITS
Undervoltage Lockout 2.6 2.8 3 V
Quiescent Current at Shutdown V
SHDN
= 0V 0.5 2 µA
Quiescent Current Not Switching 1.5 2 mA
Feedback Voltage 2mm × 2mm DFN
2mm × 2mm DFN
MS10
MS10
l
l
0.785
0.79
0.780
0.786
0.8
0.8
0.8
0.8
0.813
0.81
0.816
0.813
V
V
V
V
Reference Voltage Line Regulation 0.005 %/V
FB Pin Bias Current (Note 5)
l
15 50 nA
Switching Frequency I
DA
< 500mA (LT3502A)
I
DA
< 500mA (LT3502A)
I
DA
< 500mA (LT3502)
I
DA
< 500mA (LT3502)
l
l
1.9
1.8
0.9
0.8
2.25
2.25
1.1
1.1
2.7
2.8
1.3
1.4
MHz
MHz
MHz
MHz
Maximum Duty Cycle 100mA Load (LT3502A)
100mA Load (L
T3502)
70
80
80
90
%
%
Switch V
CESAT
I
SW
= 500mA 450 mV
Switch Current Limit (Note 3) 0.75 0.9 1.1 A
Switch Active Current SW = 10V (Note 4)
SW = 0V (Note 5)
95
8
130
30
µA
µA
BOOST Pin Current I
SW
= 500mA 10 13 mA
Minimum BOOST Voltage Above Switch I
SW
= 500mA 1.9 2.2 V
BOOST Schottky Forward Drop I
OUT
= 100mA 0.8 1 V
DA Pin Current to Stop OSC 500 650 mA
SHDN Bias Current V
SHDN
= 5V
V
SHDN
= 0V
55 80
1
µA
µA
SHDN Input Voltage High 2 V
SHDN Input Voltage Low 0.3 V
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24

LT3502AEMS#TRPBF

Mfr. #:
Buy LT3502AEMS#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 750kHz/2.2MHz,500mA Step-Down Regulator
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
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