参数资料
型号: LT3507EUHF#TRPBF
厂商: Linear Technology
文件页数: 1/28页
文件大小: 302K
描述: IC REG QD BUCK/LINEAR 38-QFN
产品培训模块: More Information on LDOs
标准包装: 2,500
拓扑: 降压(降压)(1),线性(LDO)(1)
功能: 任何功能
输出数: 4
频率 - 开关: 900kHz ~ 1.1MHz
电压/电流 - 输出 1: 0.8 V ~ 32.4 V,2.4A
电压/电流 - 输出 2: 0.8 V ~ 32.4 V,1.5A
电压/电流 - 输出 3: 0.8 V ~ 32.4 V,1.5A
带 LED 驱动器:
带监控器:
带序列发生器:
电源电压: 4 V ~ 36 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 38-WFQFN 裸露焊盘
供应商设备封装: 38-QFN(5x7)
包装: 带卷 (TR)
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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