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LT3506AEFE#TRPBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24
LT3506/LT3506A
1
3506afc
Dual Monolithic 1.6A
Step-Down Switching Regulator
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.
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.
n
Disk Drives
n
DSP Power Supplies
n
Wall Transformer Regulation
n
Distributed Power Regulation
n
DSL Modems
n
Cable Modems
n
Wide Input Voltage Range, 3.6V to 25V
n
Two 1.6A Output Switching Regulators with Internal
Power Switches
n
Constant Switching Frequency
LT3506: 575kHz
LT3506A: 1.1MHz
n
Anti-Phase Switching Reduces Ripple
n
Accurate 0.8V Reference, ±1%
n
Independent Shutdown/Soft-Start Pins
n
Independent Power Good Indicators Ease Supply
Sequencing
n
Uses Small Inductors and Ceramic Capacitors
n
Small 16-Lead Thermally Enhanced 5mm × 4mm
DFN and TSSOP Surface Mount Packages
Effi ciency
TYPICAL APPLICATION
DESCRIPTION
FEATURES
APPLICATIONS
I
OUT
(A)
0
50
EFFICIENCY (%)
70
100
0.5 1.0
3506 TA01b
60
90
80
1.5 2.0
V
IN
= 5V
V
OUT
= 1.8V
V
OUT
= 3.3V
V
IN
4.5V TO 25V
PGOOD1
PGOOD2
3506 TA01a
1.5nF
22µF47µF
22µF
0.22µF 0.22µF
10.7k
18.7k
100k
100k
33.2k
6.4µH
4.7µH
V
OUT2
3.3V
1.6A
V
OUT1
1.8V
1.6A
15k
D1
D2
15k 10k
1.5nF
1000pF 2200pF
LT3506
V
IN2
V
IN1
GND
1/2 BAT-54A
1/2 BAT-54A
D1, D2: ON SEMI MBR5230LT3
BOOST2
SW2
FB2
V
C2
RUN/SS2
BOOST1
SW1
FB1
V
C1
RUN/SS1
PGOOD1
PGOOD2
LT3506/LT3506A
2
3506afc
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
V
IN
Voltage ................................................. –0.3V to 25V
BOOST Pin Voltage ...................................................50V
BOOST Pin Above SW Pin .........................................25V
PG Pin Voltage ..........................................................25V
RUN/SS, FB, V
C
Pins ................................................5.5V
(Note 1)
16
15
14
13
12
11
10
9
17
1
2
3
4
5
6
7
8
FB1
V
C1
PG1
RUN/SS1
RUN/SS2
PG2
V
C2
FB2
BOOST1
SW1
V
IN1
V
IN1
V
IN2
V
IN2
SW2
BOOST2
TOP VIEW
DHD PACKAGE
16-LEAD PLASTIC DFN
T
JMAX
= 125°C, θ
JA
= 43°C/W, θ
JC
= 4.3°C/W
EXPOSED PAD (PIN 17) IS GND MUST BE SOLDERED TO PCB
FE PACKAGE
16-LEAD PLASTIC TSSOP NARROW
1
2
3
4
5
6
7
8
TOP VIEW
16
15
14
13
12
11
10
9
17
BOOST1
SW1
V
IN1
V
IN1
V
IN2
V
IN2
SW2
BOOST2
FB1
V
C1
PG1
RUN/SS1
RUN/SS2
PG2
V
C2
FB2
T
JMAX
= 125°C, θ
JA
= 45°C/W, θ
JC
= 10°C/W
EXPOSED PAD (PIN 17) IS GND MUST BE SOLDERED TO PCB
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
ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3506EDHD#PBF LT3506EDHD#TRPBF 3506
16-Lead (5mm × 4mm) Plastic DFN
–40°C to 85°C
LT3506AEDHD#PBF LT3506AEDHD#TRPBF 3506A
16-Lead (5mm × 4mm) Plastic DFN
–40°C to 85°C
LT3506IDHD#PBF LT3506IDHD#TRPBF 3506
16-Lead (5mm × 4mm) Plastic DFN
–40°C to 125°C
LT3506AIDHD#PBF LT3506AIDHD#TRPBF 3506A
16-Lead (5mm × 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 3506AIEFE 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 × 4mm) Plastic DFN
–40°C to 85°C
LT3506AEDHD LT3506AEDHD#TR 3506A
16-Lead (5mm × 4mm) Plastic DFN
–40°C to 85°C
LT3506IDHD LT3506IDHD#TR 3506
16-Lead (5mm × 4mm) Plastic DFN
–40°C to 125°C
LT3506AIDHD LT3506AIDHD#TR 3506A
16-Lead (5mm × 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 3506AIEFE 16-Lead Plastic TSSOP Narrow –40°C to 125°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.
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/
LT3506/LT3506A
3
3506afc
The l denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C, V
IN
= 5V, V
BOOST
= 8V, unless otherwise noted. (Note 2)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
IN(MIN)
Undervoltage Lockout
l
3.4 3.6 V
I
INQ
Quiescent Current Not Switching 3.8 4.8 mA
I
INSD
Shutdown Current V
RUNSS
= 0V 30 45 µA
V
FB
Feedback Voltage –40°C to 85°C, DHD
–40°C to 85°C, EFE
–40°C to 125°C, IFE
l
l
l
792
784
784
800
800
800
808
816
816
mV
mV
mV
I
FB
FB Pin Bias Current V
FB
= 800mV, V
C
= 0.4V
l
40 100 nA
V
FB(REG)
Reference Line Regulation V
IN
= 5V to 25V 0.005 %/V
gm
EA
Error Amp GM 350 µMhos
A
V
Error Amp Voltage Gain 400
I
VC
V
C
Source Current
V
C
Sink Current
V
FB
= 0.6V, V
C
= 0V
V
FB
= 1.2V, V
C
= 1100mV
30
30
µA
µA
V
VC(THRESH)
V
C
Switching Threshold 0.7 V
V
VC(CLAMP)
V
C
Clamp Voltage 1.9 V
f
SW
Switching Frequency LT3506
LT3506A
500
1
575
1.1
650
1.2
kHz
MHz
Switching Phase (Note 5) 180 Deg
DC Maximum Duty Cycle LT3506
LT3506A
89
78
93
88
%
%
V
FB(SWTHRESH)
Frequency Shift Threshold on FB 0.4 V
f
FOLD
Foldback Frequency V
FB
= 0V 170 kHz
I
SW
Switch Current Limit (Note 3) 2.0 2.6 3.6 A
V
SW(SAT)
Switch V
CESAT
(Note 4) I
SW
= 1A 210 mV
I
LSW
Switch Leakage Current 10 µA
V
BOOST(MIN)
Minimum Boost Voltage Above Switch I
SW
= 1A 1.5 2.5 V
I
BOOST
BOOST Pin Current I
SW
= 1A 20 30 mA
I
RUN/SS
RUN/SS Current 2.1 µA
V
RUN/SS(THRESH)
RUN/SS Threshold 0.3 0.8 V
V
FB(PGTHRESH)
V
FB
PG Threshold V
FB
Rising 720 mV
V
PG(LOW)
PG Voltage Output Low V
FB
= 640mV, I
PG
= 250µA 0.22 0.4 V
I
LPG
PG Pin Leakage V
PG
= 2V 0.1 1 µA
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 LT3506E/LT3506AE are guaranteed to meet performance
specifi cations from 0°C to 85°C. Specifi cations over the –40°C to 85°C
operating temperature range are assured by design, characterization and
correlation with statistical process controls. The LT3506I/LT3506AI are
guaranteed and tested over the full –40°C to 125°C operating temperature
range.
Note 3: Current limit is guaranteed by design and/or correlation to static
test. Slope compensation reduces current limit at high duty cycle.
Note 4: Switch V
CESAT
guaranteed by design.
Note 5: Switching phase is guaranteed by design.
ELECTRICAL CHARACTERISTICS
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LT3506AEFE#TRPBF

Mfr. #:
Buy LT3506AEFE#TRPBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators Dual 1.6A (Iout), 1.1MHz Step-Down DC/DC Converter in TSSOP-16E
Lifecycle:
New from this manufacturer.
Delivery:
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