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LT3507AIFE#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
LT3507A
1
3507afa
For more information www.linear.com/LT3507A
Features
applications
Description
Triple Monolithic Step-Down
Regulator with LDO
The LT
®
3507A is a triple, current mode, DC/DC converter
with internal power switches and a low dropout regulator.
The switching converters are step-down converters capable
of generating one 2.7A output and two 1.8A outputs. All
three converters are synchronized to a single oscillator.
The 2.7A output runs with opposite phase to the other two
converters, reducing input ripple current. Each regulator
has independent shutdown and soft-start circuits, and
generates a power good signal when its output is in regu
-
lation, easing power supply sequencing and interfacing
with microcontrollers and DSPs.
The switching frequency is set with a single resistor yielding
a range of 250kHz to 2.5MHz. The high switching frequency
allows the use of small inductors and capacitors resulting
in a very small triple output supply. The constant switching
frequency, combined with low impedance ceramic capaci
-
tors, results in low, predictable output ripple. Frequency
fo
ldback and thermal shutdown provide protection against
fault conditions. The LT3507A provides higher output cur
-
rent than available with the LT3507.
n
Wide Input Range: 4V to 36V
n
One 2.7A and Two 1.8A Output Switching
Regulators with Internal Power Switches
n
Low Dropout Linear Regulator with External
Transistor
n
Antiphase Switching Reduces Ripple
n
Independent Run, Tracking/Soft-Start, and Power
Good Indicators Ease Supply Sequencing
n
Uses Small Inductors and Ceramic Capacitors
n
Adjustable, 250kHz to 2.5MHz Switching Frequency,
Synchronizable Over the Full Range
n
User Programmable Overvoltage and Undervoltage
Lockouts
n
Thermally Enhanced, 38-Lead TSSOP and
5mm × 7mm QFN Packages
n
Automotive
n
Industrial Supplies
n
Distributed Power Regulation
n
DSP Power
typical application
V
IN1
BOOST1
BOOST3
SW3
FB3
V
C3
BIAS
DRIVE
FB4
SW1
FB1
V
C1
BOOST2
0.22µF
10.2k
53.6k
V
IN
6V TO 36V
V
OUT3
5V
1.8A
V
IN2
V
IN3
SW2
FB2
V
C2
GND
LT3507A
22µF
25.5k
3507A TA01a
107k 11.5k
V
OUT2
3.3V
1.5A
V
OUT4
2.5V
0.3A
RT/SYNC
680pF
15µH
2.2µF
33µF
f
SW
= 450kHz
0.22µF
0.22µF
15k
18.7k
V
OUT1
1.8V
2.7A
100µF
680pF
25.5k
4.7µH
24.3k
680pF
25.5k
11k
34.8k
10µH
22µF
V
OUT2
Start-Up Waveforms—Coincident Tracking
5V, 3.3V, 2.5V and 1.8V Step-Down Regulator
1V/DIV
V
OUT1
V
OUT2
V
OUT3
V
OUT4
1ms/DIV
3507 TA01b
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. All other trademarks are the property of their respective owners.
LT3507A
2
3507afa
For more information www.linear.com/LT3507A
absolute MaxiMuM ratings
V
IN
Pins ...................................................... –0.3V to 36V
BOOST Pins ..............................................................55V
BOOST Above SW .....................................................25V
PGOOD Pins .............................................................. 36V
BIAS Pin ....................................................................16V
TRK/SS, V
C
, FB, RT/SYNC Pins ...................................6V
RUN, OVLO, UVLO Pins ........................................... V
IN1
(Note 1)
DRIVE Pin ...................................................................5V
Operating Junction Temperature Range (Notes 2, 5)
LT3507AE, LT3507AI ......................... –40°C to 125°C
LT3507AH .......................................... –40°C to 150°C
Storage Temperature Range .................. –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
TSSOP Only ...................................................... 300°C
13 14 15 16
TOP VIEW
39
GND
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
17 18 19
38 37 36 35 34 33 32
24
25
26
27
28
29
30
31
8
7
6
5
4
3
2
1BOOST1
V
IN1
V
IN1
V
INSW
OVLO
UVLO
V
C1
TRK/SS1
FB1
PGOOD1
PGOOD2
PGOOD3
V
IN2
V
IN2
SW2
SW2
BOOST2
TRK/SS4
FB4
DRIVE
V
C2
FB2
TRK/SS2
FB3
SW1
SW1
V
IN3
V
IN3
SW3
SW3
BOOST3
RT/SYNC
RUN1
RUN2
RUN3
BIAS
TRK/SS3
V
C3
23
22
21
20
9
10
11
12
θ
JA
= 34°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
TOP VIEW
FE PACKAGE
38-LEAD PLASTIC TSSOP
38
37
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
V
IN3
SW1
SW1
BOOST1
V
IN1
V
IN1
V
INSW
OVLO
UVLO
V
C1
TRK/SS1
FB1
PGOOD1
PGOOD2
PGOOD3
RT/SYNC
RUN1
RUN2
RUN3
SW3
BOOST3
V
IN2
V
IN2
NC
SW2
BOOST2
TRK/SS4
FB4
DRIVE
V
C2
NC
FB2
TRK/SS2
FB3
V
C3
TRK/SS3
BIAS
GND
39
GND
θ
JA
= 24°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
pin conFiguration
LT3507A
3
3507afa
For more information www.linear.com/LT3507A
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3507AEUHF#PBF LT3507AEUHF#TRPBF 3507A 38-Lead (5mm × 7mm) Plastic QFN –40°C to 125°C
LT3507AIUHF#PBF LT3507AIUHF#TRPBF 3507A 38-Lead (5mm × 7mm) Plastic QFN –40°C to 125°C
LT3507AHUHF#PBF LT3507AHUHF#TRPBF 3507A 38-Lead (5mm × 7mm) Plastic QFN –40°C to 150°C
LT3507AEFE#PBF LT3507AEFE#TRPBF LT3507AFE 38-Lead Plastic TSSOP –40°C to 125°C
LT3507AIFE#PBF LT3507AIFE#TRPBF LT3507AFE 38-Lead Plastic TSSOP –40°C to 125°C
LT3507AHFE#PBF LT3507AHFE#TRPBF LT3507AFE 38-Lead Plastic TSSOP –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.
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/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
electrical characteristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN1
, V
IN2
, V
IN3
= 12V, V
BOOST1
, V
BOOST2
, V
BOOST3
= 17V, unless
otherwise noted. (Notes 2, 7)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operating Voltage Internal UVLO on V
IN1
l
3.8 4 V
Input Quiescent Current Not Switching, V
BIAS
= 3.3V 2 3.5 mA
Bias Quiescent Current Not Switching, V
BIAS
= 3.3V 5 7.5 mA
Shutdown Current V
RUN1,2,3
= 0V 1 µA
Reference Voltage Line Regulation 5V < V
IN1
< 36V 0.01 %/V
V
C
Source Current V
C
= 0.6V 20 µA
V
C
Sink Current V
C
= 0.6V 30 µA
V
C
Clamp Voltage 1.8 V
Switching Frequency R
T
= 40.2k
l
0.9 1.1 MHz
Switching Phase SW1 to SW2,3, R
T
= 40.2k 180 Deg
Foldback Frequency V
FB
= 0V, R
T
= 40.2k 120 kHz
Frequency Shift Threshold on FB 0.4 V
RUN Threshold 1 1.5 V
PGOOD Output Voltage Low I
PGOOD
= 200µA 0.2 0.4 V
PGOOD Pin Leakage V
PGOOD
= 2V 10 400 nA
PGOOD Threshold Offset V
FB
Rising 58 80 105 mV
Feedback Pin Voltage
l
788 800 812 mV
Feedback Pin Bias Current
l
–50 –500 nA
Error Amplifier Transconductance 330 µS
Error Amplifier Voltage Gain 500 V/V
V
C
Switching Threshold 0.9 V
Switch Leakage Current 0.01 10 µA
Minimum Boost Voltage Above Switch (Note 4) 1.8 2.5 V
I
TRK/SS
V
TRK/SS
= 0V 1.25 µA
V
IN1
-V
INSW
I
VINSW
= 1mA 0.35 V
Converter 1
V
C1
to Switch Current Gain 6 A/V
orDer inForMation
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LT3507AIFE#PBF

Mfr. #:
Buy LT3507AIFE#PBF
Manufacturer:
Analog Devices / Linear Technology
Description:
Switching Voltage Regulators 3x Mono Buck Reg w/ LDO
Lifecycle:
New from this manufacturer.
Delivery:
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