Linear Regulator/Controller. LT3500 Datasheet

LT3500 Regulator/Controller. Datasheet pdf. Equivalent

Part LT3500
Description Monolithic 2A Step-Down Regulator Plus Linear Regulator/Controller
Feature www.DataSheet4U.com FEATURES n n n n n n n n n n LT3500 Monolithic 2A Step-Down Regulator Plus Lin.
Manufacture Linear Technology
Total Page 28 Pages
Datasheet
Download LT3500 Datasheet



LT3500
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FEATURES
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
APPLICATIONS
n Automotive Battery Regulation
n Industrial Control
n Wall Transformer Regulation
n Distributed Power Regulation
LT3500
Monolithic 2A Step-Down
Regulator Plus Linear
Regulator/Controller
DESCRIPTION
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 efficiency 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 configured 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.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
Dual Step-Down Converters
VIN
6V TO 36V
2.2μF
0.47μF
53.6k
330pF
40.2k
VIN BST
LT3500
SW
SHDN
SS
FB
PG
PG
RT/SYNC LDRV
VC
LFB
0.47μF
6.8μH
B240A
42.2k
8.06k
VOUT1
5V
1A
22μF
1k
24.9k
8.06k
VOUT2
3.3V
22μF 1A
3500 TA01a
Switching Converter Efficiency
90
85
80 VOUT1 = 5V AT 1A
AC COUPLED
75 2mV/DIV
70
65
60
55
VIN = 12V
IOUT2 = 0A
FREQUENCY = 800kHz
50
0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
LOAD CURRENT (A)
3500 TA01b
VOUT2 = 3.3V AT 1A
AC COUPLED
2mV/DIV
Output Voltage Ripple
500ns/DIV
3500 TA01c
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LT3500
LT3500www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN, PG, PG Operating.................................... 40V/–0.3V
SW .............................................................................VIN
BST ................................................................ 55V/–0.3V
BST Pin Above SW....................................................25V
LDRV, SHDN..............................................................15V
FB, LFB, RT/SYNC .......................................................5V
SS, VC ......................................................................2.5V
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
PIN CONFIGURATION
TOP VIEW
VIN
SHDN
SS
PG
VC
RT/SYNC
1
2
3
4
5
6
12 SW
11 BST
13 10 LDRV
9 LFB
8 FB
7 PG
DD PACKAGE
12-LEAD (3mm × 3mm) PLASTIC DFN
θJA = 45°C/W, θJC(PAD) = 10°C/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
NC1 1
VIN 2
SHDN 3
SS 4
PG 5
VC 6
RT/SYNC 7
NC8 8
TOP VIEW
17
16 NC16
15 SW
14 BST
13 LDRV
12 LFB
11 FB
10 PG
9 NC9
MSE PACKAGE
16-LEAD PLASTIC MSE
θJA = 45°C/W, θJC(PAD) = 10°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
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 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/
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