LT3507
1
3507fa
FEATURES
APPLICATIONS
DESCRIPTION
Triple Monolithic Step-Down
Regulator with LDO
The LT
?/DIV>
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.
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
n
DSL and Cable Modems
n
Distributed Power Regulation
n
DSP Power
n
Automotive
TYPICAL APPLICATION
V
IN1
BOOST1
BOOST3
SW3
FB3
V
C3
BIAS
DRIVE
FB4
SW1
FB1
V
C1
BOOST2
0.22糉
10.2k
53.6k
V
IN
6V TO 36V
V
OUT3
5V
1.5A
V
IN2
V
IN3
SW2
FB2
V
C2
GND
LT3507
22糉
24.3k
3507 TA01a
107k
11.5k
V
OUT2
3.3V
1.3A
V
OUT4
2.5V
0.2A
R
T
/SYNC
680pF
15糎
2.2糉
22糉
f
SW
= 450kHz
0.22糉
0.22糉
15k
18.7k
V
OUT1
1.8V
2.4A
100糉
18.7k
680pF
4.7糎
24.3k
1000pF
16.2k
11.5k
35.7k
10糎
22糉
V
OUT2
Start-Up WaveformsCoincident 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, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
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