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Linear Technology Electronic Components Datasheet

LT3507 Datasheet

Triple Monolithic Step-Down Regulator

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LT3507
Triple Monolithic Step-Down
Regulator with LDO
FEATURES
n Wide Input Range: 4V to 36V
n One 2.4A and Two 1.5A 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 5mm × 7mm QFN
Package
APPLICATIONS
n DSL and Cable Modems
n Distributed Power Regulation
n DSP Power
n Automotive
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
DESCRIPTION
The LT®3507 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 2.4A output and two 1.5A outputs. All
three converters are synchronized to a single oscillator.
The 2.4A 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. With its wide
input voltage range of 4V to 36V, the LT3507 regulates a
broad array of power sources including 5V logic rails,
unregulated wall transformers, lead acid batteries and
distributed power supplies.
TYPICAL APPLICATION
VIN
6V TO 36V
VOUT1
1.8V
2.4A
VOUT3
5V
1.5A
5V, 3.3V, 2.5V and 1.8V Step-Down Regulator
22μF
4.7μH
VIN1 VIN2 VIN3
BOOST1
BOOST2
0.22μF
SW1
0.22μF
18.7k
100μF
15k
18.7k
VOUT2
15μH
680pF
FB1
VC1
LT3507
0.22μF BOOST3
SW3
53.6k
10μH
SW2
FB2
1000pF
16.2k
VC2
35.7k
11.5k
22μF
10.2k
680pF
24.3k
FB3
VC3
RT/SYNC
107k GND
BIAS
DRIVE
FB4
24.3k
11.5k
fSW = 450kHz
VOUT2
3.3V
1.3A
22μF
2.2μF
VOUT4
2.5V
0.2A
3507 TA01a
Start-Up Waveforms—Coincident Tracking
1V/DIV
VOUT3
VOUT2
VOUT4
VOUT1
1ms/DIV
3507 TA01b
3507f
1


Linear Technology Electronic Components Datasheet

LT3507 Datasheet

Triple Monolithic Step-Down Regulator

No Preview Available !

LT3507www.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
VIN Pins...................................................... –0.3V to 36V
BOOST Pins ..............................................................55V
BOOST Above SW.....................................................25V
PGOOD Pins..............................................................36V
BIAS Pin....................................................................16V
TRK/SS, VC, FB, RT/SYNC Pins ...................................6V
RUN, OVLO, UVLO Pins ........................................... VIN1
DRIVE Pin ...................................................................5V
Operating Junction Temperature Range (Notes 2, 5)
LT3507E, LT3507I .............................. –40°C to 125°C
LT3507H ............................................ –40°C to 150°C
Storage Temperature Range................... –65°C to 150°C
PIN CONFIGURATION
TOP VIEW
BOOST1 1
VIN1 2
VIN1 3
VINSW 4
OVLO 5
UVLO 6
VC1 7
TRK/SS1 8
FB1 9
PGOOD1 10
PGOOD2 11
PGOOD3 12
38 37 36 35 34 33 32
39
13 14 15 16 17 18 19
31 VIN2
30 VIN2
29 SW2
28 SW2
27 BOOST2
26 TRK/SS4
25 FB4
24 DRIVE
23 VC2
22 FB2
21 TRK/SS2
20 FB3
UHF PACKAGE
38-LEAD (5mm × 7mm) PLASTIC QFN
θJA = 34°C/W
EXPOSED PAD (PIN 39) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
LT3507EUHF#PBF
LT3507IUHF#PBF
LT3507HUHF#PBF
LT3507EUHF#TRPBF
LT3507IUHF#TRPBF
LT3507HUHF#TRPBF
3507
3507
3507
38-Lead (5mm × 7mm) Plastic QFN
38-Lead (5mm × 7mm) Plastic QFN
38-Lead (5mm × 7mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
*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/
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 150°C
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. VIN1, VIN2, VIN3 = 12V, VBOOST1, VBOOST2, VBOOST3 = 17V, unless
otherwise noted. (Note 2)
PARAMETER
Minimum Operating Voltage
Input Quiescent Current
Bias Quiescent Current
Shutdown Current
Reference Voltage Line Regulation
CONDITIONS
Internal UVLO on VIN1
Not Switching, VBIAS = 3.3V
Not Switching, VBIAS = 3.3V
VRUN1,2,3 = 0V
5V < VIN1 < 36V
MIN TYP MAX UNITS
l
3.8 4
V
2 3.5
mA
5 7.5
mA
1 μA
0.01 %/V
3507f
2


Part Number LT3507
Description Triple Monolithic Step-Down Regulator
Maker Linear Technology
PDF Download

LT3507 Datasheet PDF






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