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LT3500IMSE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
LT3500
1
3500fc
FEATURES
APPLICATIONS
DESCRIPTION
Monolithic 2A Step-Down
Regulator Plus Linear
Regulator/Controller
The LT
®
3500 is a current mode PWM step-down DC/DC
converter with an internal 2.3A switch. The wide input range
of 3V to 40V makes the LT3500 suitable for regulating
power from a wide variety of sources, including automo-
tive batteries, 24V industrial supplies and unregulated
wall adapters.
Resistor-programmable 250kHz to 2.2MHz frequency
range and synchronization capability enable optimization
between effi ciency and external component size. Cycle-
by-cycle current limit, frequency foldback and thermal
shutdown provide protection against a shorted output.
The soft-start feature controls the ramp rate of the output
voltage, eliminating input current surge during start-up,
and also provides output tracking.
The LT3500 contains an internal NPN transistor with feed-
back control which can be confi gured as a linear regulator
or as a linear regulator controller.
The LT3500’s low current shutdown mode (<12µA) enables
easy power management in battery-powered systems.
n
Wide Input Range: 3V to 36V Operating,
40V Maximum
n
Short-Circuit Protected Over Full Input Range
n
2A Output Current Capability
n
Adjustable/Synchronizable Fixed Frequency
Operation from 250kHz to 2.2MHz
n
Soft-Start/Tracking Capability
n
Output Adjustable Down to 0.8V
n
Adjustable Linear Regulator/Driver with 13mA
Output Capability
n
Power Good Comparator with Complimentary
Outputs
n
Low Shutdown Current: 12µA
n
Thermally Enhanced 3mm × 3mm DFN or 16-Pin
MSOP Package
n
Automotive Battery Regulation
n
Industrial Control
n
Wall Transformer Regulation
n
Distributed Power Regulation
Dual Step-Down Converters
Output Voltage RippleSwitching Converter Effi ciency
6.8µH
0.47µF
22µF
22µF
42.2k
8.06k
2.2µF
0.47µF
V
IN
6V TO 36V
40.2k
53.6k
330pF
3500 TA01a
V
OUT1
5V
1A
V
OUT2
3.3V
1A
B240A
BSTV
IN
SW
FB
SHDN
SS
LT3500
R
T/
SYNC
V
C
LDRV
LFB
PG
PG
8.06k
24.9k
1k
LOAD CURRENT (A)
0
EFFICIENCY (%)
90
85
80
75
70
65
60
55
50
1.6
3500 TA01b
0.4 0.8 1.2 2.01.40.2 0.6 1.0 1.8
V
IN
= 12V
I
OUT2
= 0A
FREQUENCY = 800kHz
500ns/DIV
3500 TA01c
V
OUT1
= 5V AT 1A
AC COUPLED
2mV/DIV
V
OUT2
= 3.3V AT 1A
AC COUPLED
2mV/DIV
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.
LT3500
2
3500fc
ABSOLUTE MAXIMUM RATINGS
V
IN
, PG, PG Operating .................................... 40V/–0.3V
SW .............................................................................V
IN
BST ................................................................ 55V/–0.3V
BST Pin Above SW ....................................................25V
LDRV, SHDN ..............................................................15V
FB, LFB, R
T
/SYNC .......................................................5V
SS, V
C
......................................................................2.5V
(Note 1)
TOP VIEW
DD PACKAGE
12-LEAD (3mm × 3mm) PLASTIC DFN
12
13
11
8
9
10
4
5
3
2
1
SW
BST
LDRV
LFB
FB
PG
V
IN
SHDN
SS
PG
V
C
R
T
/SYNC
6
7
θ
JA
= 45°C/W, θ
JC(PAD)
= 10°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
5
6
7
8
NC1
V
IN
SHDN
SS
PG
V
C
R
T
/SYNC
NC8
16
15
14
13
12
11
10
9
NC16
SW
BST
LDRV
LFB
FB
PG
NC9
TOP VIEW
MSE PACKAGE
16-LEAD PLASTIC MSE
17
θ
JA
= 45°C/W, θ
JC(PAD)
= 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
PIN CONFIGURATION
ORDER INFORMATION
Operating Junction Temperature Range
LT3500EDD (Note 2) .......................... –40°C to 125°C
LT3500IDD (Note 2) ........................... –40°C to 125°C
LT3500HDD (Note 2).......................... –40°C to 150°C
LT3500EMSE (Note 2)........................ –40°C to 125°C
LT3500IMSE (Note 3) ........................ –40°C to 125°C
LT3500HMSE (Note 2) ....................... –40°C to 150°C
Storage Temperature Range ................... –65°C to 150°C
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3500EDD#PBF LT3500EDD#TRPBF LCRN
12-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LT3500IDD#PBF LT3500IDD#TRPBF LCRN
12-Lead (3mm × 3mm) Plastic DFN
–40°C to 125°C
LT3500HDD#PBF LT3500HDD#TRPBF LDCY
12-Lead (3mm × 3mm) Plastic DFN
–40°C to 150°C
LT3500EMSE#PBF LT3500EMSE#TRPBF 3500 16-Lead Plastic MSE –40°C to 125°C
LT3500IMSE#PBF LT3500IMSE#TRPBF 3500 16-Lead Plastic MSE –40°C to 125°C
LT3500HMSE#PBF LT3500HMSE#TRPBF 3500 16-Lead Plastic MSE –40°C to 150°C
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifi
cations, go to: http://www
.linear.com/tapeandreel/
LT3500
3
3500fc
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
J
= 25°C. V
VIN
= 15V, V
RT/SYNC
= 2V, unless otherwise specifi ed.
PARAMETER CONDITIONS MIN TYP MAX UNITS
SHDN Threshold
l
710 760 780 mV
SHDN Source Current V
SHDN
= 0.62V 1.5 2.5 3.5 µA
SHDN Current Hysterisis 1.25 2 3.25 µA
Minimum Input Voltage (Note 3) V
FB
= 0V
l
2.4 2.8 V
Supply Shutdown Current V
SHDN
= 0V
l
12 30 µA
Supply Quiescent Current V
FB
= 0.9V 2.5 3.5 mA
FB Voltage V
VC
= 1V
V
VC
= 0.8V to 1.6V, V
IN
= 3V to 40V
l
l
0.784
0.776
0.8
0.8
0.816
0.824
V
V
FB Bias Current V
FB
= 0.8V, V
VC
= 1V 50 150 nA
Error Amplifi er g
m
V
VC
= 1V, I
VC
= ±10µA 150 250 350 µmho
Error Amplifi er Source Current V
FB
= 0.6V, V
VC
= 1V 12 16 20 µA
Error Amplifi er Sink Current V
FB
= 1V, V
VC
= 1V 14 18 22 µA
Error Amplifi er High Clamp V
FB
= 0.6V 1.8 2.0 2.2 V
Error Amplifi er Switching Threshold V
FB
= 0.6V 0.6 0.8 1.0 V
SS Source Current V
SS
= 0.4V, V
FB
= 0.9V 2.25 2.75 3.75 µA
SS Sink Current V
FB
= 0V, V
SS
= 2V 300 600 900 µA
SS POR Sink Current (Note 4) V
FB
= 0V, V
SS
= 2V, Cycle SHDN 400 600 800 µA
SS POR Threshold 50 100 150 mV
SS to FB Offset (V
SS
– V
FB
)V
VC
= V
FS
, V
SS
= 0.4V 70 100 120 mV
PG/PG Leakage V
FB
= 0.9V, V
PG
/V
PG
= 40V 0.1 1 µA
PG/PG Threshold (Rising) V
PG
= 0.4V 0.685 0.708 0.730 V
PG/PG Hysteresis (Falling) V
PG
= 0.4V 20 30 40 mV
PG Sink Current V
PG
= 0.4V, V
FB
= 0.7V 250 500 750 µA
PG Sink Current V
PG
= 0.4V, V
FB
= 0.9V 500 800 1100 µA
R
T
/SYNC Reference Voltage V
FB
= 0.9V, R
RT/SYNC
= 15k 0.75 0.850 0.975 V
Switching Frequency R
RT/SYNC
= 90.9k
R
RT/SYNC
= 90.9k
R
RT/SYNC
= 15k
l
450
425
2
500
500
2.4
550
625
2.8
kHz
kHz
MHz
SYNC Frequency Range
l
250 2500 kHz
Minimum Switch On Time V
FB
= 0.7V, R
RT/SYNC
= 90.9k 140 ns
Minimum Switch Off Time V
FB
= 0.7V, R
RT/SYNC
= 90.9k 120 ns
Switch Leakage Current V
SW
= 0V 1 10 µA
Switch Saturation Voltage I
SW
= 2A, V
BST
= 18V, V
FB
= 0.7V 450 mV
Switch Peak Current DD Package V
BST
= 18V, V
FB
= 0.7V
l
2.3
2.1
2.8
2.8
3.5
3.5
A
A
Switch Peak Current MSE Package V
BST
= 18V, V
FB
= 0.7V
l
2.3
2.1
2.9
2.9
3.5
3.7
A
A
Boost Current I
SW
= 2A, V
BST
= 20V, V
FB
= 0.7V 20 30 45 mA
Minimum Boost Voltage (Note 5) I
SW
= 2A, V
FB
= 0.7V 2.2 3 V
ELECTRICAL CHARACTERISTICS
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LT3500IMSE#PBF

Mfr. #:
Buy LT3500IMSE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Monolithic 2A Step-Down Regulator plus Linear Regulator/Controller
Lifecycle:
New from this manufacturer.
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