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LT3507A fiches techniques PDF

Linear - Triple Monolithic Step-Down Regulator

Numéro de référence LT3507A
Description Triple Monolithic Step-Down Regulator
Fabricant Linear 
Logo Linear 





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LT3507A fiche technique
FEATURES
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
APPLICATIONS
n Automotive
n Industrial Supplies
n Distributed Power Regulation
n DSP Power
LT3507A
Triple Monolithic Step-Down
Regulator with LDO
DESCRIPTION
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
foldback and thermal shutdown provide protection against
fault conditions. The LT3507A provides higher output cur-
rent than available with the LT3507.
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.
TYPICAL APPLICATION
5V, 3.3V, 2.5V and 1.8V Step-Down Regulator
VIN
6V TO 36V
VOUT1
1.8V
2.7A
VOUT3
5V
1.8A
22µF
4.7µH
VIN1 VIN2 VIN3
BOOST1
BOOST2
0.22µF
SW1
18.7k
100µF
15k
25.5k
VOUT2
15µH
680pF
FB1
VC1
LT3507A
0.22µF BOOST3
SW3
53.6k
22µF
10.2k
25.5k 680pF
FB3
VC3
SW2
FB2
VC2
BIAS
DRIVE
RT/SYNC
107k GND
FB4
0.22µF
10µH
34.8k
680pF 25.5k 11k
24.3k
11.5k
VOUT2
3.3V
33µF 1.5A
2.2µF
VOUT4
2.5V
0.3A
fSW = 450kHz
3507A TA01a
Start-Up Waveforms—Coincident Tracking
1V/DIV
VOUT3
VOUT2
VOUT4
VOUT1
1ms/DIV
3507 TA01b
3507af
1

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