Switching Regulator. LT3506A Datasheet

LT3506A Regulator. Datasheet pdf. Equivalent

Part LT3506A
Description Dual Monolithic 1.6A Step-Down Switching Regulator
Feature www.DataSheet4U.com LT3506/LT3506A Dual Monolithic 1.6A Step-Down Switching Regulator The LT®3506 i.
Manufacture Linear Technology
Datasheet
Download LT3506A Datasheet



LT3506A
www.DataSheet4U.com
LT3506/LT3506A
Dual Monolithic 1.6A
Step-Down Switching Regulator
FEATURES
Wide Input Voltage Range, 3.6V to 25V
Two 1.6A Output Switching Regulators with Internal
Power Switches
Constant Switching Frequency
LT3506: 575kHz
LT3506A: 1.1MHz
Anti-Phase Switching Reduces Ripple
Accurate 0.8V Reference, ±1%
Independent Shutdown/Soft-Start Pins
Independent Power Good Indicators Ease Supply
Sequencing
Uses Small Inductors and Ceramic Capacitors
Small 16-Lead Thermally Enhanced 5mm × 4mm
DFN and TSSOP Surface Mount Packages
APPLICATIOUS
Disk Drives
DSP Power Supplies
Wall Transformer Regulation
Distributed Power Regulation
DSL Modems
Cable Modems
DESCRIPTIO
The LT®3506 is a dual current mode PWM step-down DC/DC
converter with internal 2A power switches. Both convert-
ers are synchronized to a single oscillator and run with
opposite phases, reducing input ripple current. The output
voltages are set with external resistor dividers, and each
regulator has independent shutdown and soft-start circuits.
Each regulator generates a power-good signal when its
output is in regulation, easing power supply sequencing
and interfacing with microcontrollers and DSPs.
The LT3506 switching frequency is 575kHz and the LT3506A
is 1.1MHz. These high switching frequencies allow the
use of tiny inductors and capacitors, resulting in a very
small dual 1.6A output solution. Constant frequency and
ceramic capacitors combine to produce low, predictable
output ripple voltage. With its wide input range of 3.6V to
25V, the LT3506 regulates a wide variety of power sources,
from 4-cell batteries and 5V logic rails to unregulated wall
transformers, lead acid batteries and distributed-power
supplies. Current mode PWM architecture provides fast
transient response with simple compensation components
and cycle-by-cycle current limiting. Frequency foldback
and thermal shutdown provide additional protection.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
TYPICAL APPLICATIO
VOUT1
1.8V
1.6A
VIN
4.5V TO 25V
4.7µH
18.7k
47µF 15k
22µF
0.22µF
1000pF
VIN1 VIN2
BOOST1 BOOST2
SW1 SW2
FB1 FB2
VC1 VC2
1/2 BAT-54A
1/2 BAT-54A
0.22µF
2200pF
6.4µH
33.2k
D1 15k
LT3506
10k D2 10.7k
PGOOD1
PGOOD2
100k
100k
1.5nF
RUN/SS1 RUN/SS2
PGOOD1
1.5nF
PGOOD2
GND
D1, D2: ON SEMI MBR5230LT3
VOUT2
3.3V
1.6A
22µF
3506 F01
100 VIN = 5V
Efficiency
90 VOUT = 3.3V
80 VOUT = 1.8V
70
60
50
0
0.5 1.0 1.5 2.0
IOUT (A)
3506 TA01b
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LT3506A
wwwL.DTata3Sh5ee0t4U6.co/mLT3506A
Absolute Maximum Ratings
(Note 1)
VIN Voltage................................................. –0.3V to 25V
BOOST Pin Voltage....................................................50V
BOOST Pin Above SW Pin.........................................25V
PG Pin Voltage...........................................................25V
RUN/SS, FB, VC Pins................................................5.5V
Maximum Junction Temperature........................... 125°C
Operating Temperature Range (Note 2)
E Grade................................................. –40°C to 85°C
I Grade............................................... –40°C to 125°C
Storage Temperature Range................... –65°C to 125°C
PI CO FIGURATIO
TOP VIEW
BOOST1 1
SW1 2
VIN1
VIN1
VIN2
VIN2
SW2
3
4
5
6
7
BOOST2 8
16 FB1
15 VC1
14 PG1
13 RUN/SS1
17
12 RUN/SS2
11 PG2
10 VC2
9 FB2
DHD PACKAGE
16-LEAD PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W, θJC = 4.3°C/W
EXPOSED PAD (PIN 17) IS GND MUST BE SOLDERED TO PCB
TOP VIEW
BOOST1 1
SW1 2
VIN1
VIN1
VIN2
VIN2
SW2
3
4
5
6
7
BOOST2 8
16 FB1
15 VC1
14 PG1
17 13 RUN/SS1
12 RUN/SS2
11 PG2
10 VC2
9 FB2
FE PACKAGE
16-LEAD PLASTIC TSSOP NARROW
TJMAX = 125°C, θJA = 45°C/W, θJC = 10°C/W
EXPOSED PAD (PIN 17) IS GND MUST BE SOLDERED TO PCB
ORDER IUFORWATIOU
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3506EDHD#PBF
LT3506EDHD#TRPBF
3506
16-Lead (5mm x 4mm) Plastic DFN
–40°C to 85°C
LT3506AEDHD#PBF
LT3506AEDHD#TRPBF 3506A
16-Lead (5mm x 4mm) Plastic DFN
–40°C to 85°C
LT3506IDHD#PBF
LT3506IDHD#TRPBF
3506
16-Lead (5mm x 4mm) Plastic DFN
–40°C to 125°C
LT3506AIDHD#PBF
LT3506AIDHD#TRPBF 3506A
16-Lead (5mm x 4mm) Plastic DFN
–40°C to 125°C
LT3506EFE#PBF
LT3506EFE#TRPBF
3506EFE
16-Lead Plastic TSSOP Narrow
–40°C to 85°C
LT3506AEFE#PBF
LT3506AEFE#TRPBF
3506AEFE
16-Lead Plastic TSSOP Narrow
–40°C to 85°C
LT3506IFE#PBF
LT3506IFE#TRPBF
3506IFE
16-Lead Plastic TSSOP Narrow
–40°C to 125°C
LT3506AIFE#PBF
LT3506AIFE#TRPBF
3506AIFE
16-Lead Plastic TSSOP Narrow
–40°C to 125°C
LEAD BASED FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT3506EDHD
LT3506EDHD#TR
3506
16-Lead (5mm x 4mm) Plastic DFN
–40°C to 85°C
LT3506AEDHD
LT3506AEDHD#TR
3506A
16-Lead (5mm x 4mm) Plastic DFN
–40°C to 85°C
LT3506IDHD
LT3506IDHD#TR
3506
16-Lead (5mm x 4mm) Plastic DFN
–40°C to 125°C
LT3506AIDHD
LT3506AIDHD#TR
3506A
16-Lead (5mm x 4mm) Plastic DFN
–40°C to 125°C
LT3506EFE
LT3506EFE#TR
3506EFE
16-Lead Plastic TSSOP Narrow
–40°C to 85°C
LT3506AEFE
LT3506AEFE#TR
3506AEFE
16-Lead Plastic TSSOP Narrow
–40°C to 85°C
LT3506IFE
LT3506IFE#TR
3506IFE
16-Lead Plastic TSSOP Narrow
–40°C to 125°C
LT3506AIFE
LT3506AIFE#TR
3506AIFE
16-Lead Plastic TSSOP Narrow
–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.
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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