型号
  • 型号
  • 关键词
首页 > 器件类别 >

LT3502AIDC-PBF

1.1MHz/2.2MHz, 500mA Step-Down Regulators in 2mm × 2mm DFN and MS10

厂商名称：Linear ( ADI )

厂商官网：http://www.analog.com/cn/index.html

下载文档
预览
文档预览
FEATURES
■
■
■
LT3502/LT3502A
1.1MHz/2.2MHz, 500mA
Step-Down Regulators in
2mm
×
2mm DFN and MS10
DESCRIPTION
The LT
®
3502/LT3502A are current mode PWM step-down
DC/DC converters with an internal 500mA power switch,
in tiny 8-lead 2mm
×
2mm DFN and 10-lead MS10
packages. The wide input voltage range of 3V to 40V makes
the LT3502/LT3502A suitable for regulating power from a
wide variety of sources, including 24V industrial supplies
and automotive batteries. Its high operating frequency
allows the use of tiny, low cost inductors and capacitors,
resulting in a very small solution. Constant frequency
above the AM band avoids interfering with radio reception,
making the LT3502A particularly suitable for automotive
applications.
Cycle-by-cycle current limit and frequency foldback
provide protection against shorted outputs. Soft-start
and frequency foldback eliminates input current surge
during start-up. DA current sense provides further protec-
tion in fault conditions. An internal boost diode reduces
component count.
L,
LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
■
■
■
■
■
■
■
3V to 40V Input Voltage Range
500mA Output Current
Switching Frequency: 2.2MHz (LT3502A),
1.1MHz (LT3502)
800mV Feedback Voltage
Short-Circuit Robust
Soft-Start
Low Shutdown Current: <2μA
Internally Compensated
Internal Boost Diode
Thermally Enhanced 2mm
×
2mm 8-Lead DFN
and 10-lead MS10 Package
APPLICATIONS
■
■
■
■
Automotive Systems
Battery-Powered Equipment
Wall Transformer Regulation
Distributed Supply Regulation
TYPICAL APPLICATION
3.3V Step-Down Converter
90
V
IN
4.7V TO 40V
BD
V
IN
1μF
SW
LT3502A
DA
OFF ON
SHDN
GND
31.6k
FB
10k
10μF
BOOST
EFFICIENCY (%)
0.1μF 6.8μH
V
OUT
3.3V
500mA
80
5V
OUT
70
60
50
40
30
20
10
3502 TA01a
LT3502A 12V
IN
Efficiency
3.3V
OUT
0
0
0.1
0.3
0.2
LOAD CURRENT (A)
0.4
0.5
3502 TA01b
3502fc
1
LT3502/LT3502A
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage (V
IN
) ....................................................40V
BOOST Voltage .........................................................50V
BOOST Pin Above SW Pin...........................................7V
FB Voltage ...................................................................6V
SHDN
Voltage ...........................................................40V
BD Voltage ..................................................................7V
Operating Junction Temperature Range (Note 2)
LT3502AE, LT3502E ...........................–40°C to 125°C
LT3502AI, LT3502I .............................–40°C to 125°C
Storage Temperature Range...................–65°C to 150°C
PIN CONFIGURATION
TOP VIEW
V
IN
1
BD 2
FB 3
SHDN 4
9
8 SW
7 BOOST
6 DA
5 GND
SW
BOOST
NC
DA
GND
1
2
3
4
5
TOP VIEW
10
9
8
7
6
V
IN
NC
BD
FB
SHDN
DC PACKAGE
8-LEAD (2mm
×
2mm) PLASTIC DFN
θ
JA
= 102°C/W
EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO PCB
MS PACKAGE
10-LEAD PLASTIC MSOP
θ
JA
= 110°C/W
ORDER INFORMATION
LEAD FREE FINISH
LT3502EDC#PBF
LT3502IDC#PBF
LT3502AEDC#PBF
LT3502AIDC#PBF
LT3502EMS#PBF
LT3502IMS#PBF
LT3502AEMS#PBF
LT3502AIMS#PBF
TAPE AND REEL
LT3502EDC#TRPBF
LT3502IDC#TRPBF
LT3502AEDC#TRPBF
LT3502AIDC#TRPBF
LT3502EMS#TRPBF
LT3502IMS#TRPBF
LT3502AEMS#TRPBF
LT3502AIMS#TRPBF
PART MARKING*
LCLV
LCLV
LCLT
LCLT
LTDTR
LTDTR
LTDTS
LTDTS
PACKAGE DESCRIPTION
8-Lead 2mm
×
2mm Plastic DFN
8-Lead 2mm
×
2mm Plastic DFN
8-Lead 2mm
×
2mm Plastic DFN
8-Lead 2mm
×
2mm Plastic DFN
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
10-Lead Plastic MSOP
TEMPERATURE RANGE
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
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/
3502fc
2
LT3502/LT3502A
ELECTRICAL CHARACTERISTICS
PARAMETER
Undervoltage Lockout
Quiescent Current at Shutdown
Quiescent Current
Feedback Voltage
V
SHDN
= 0V
Not Switching
2mm
×
2mm DFN
2mm
×
2mm DFN
MS10
MS10
(Note 5)
I
DA
< 500mA (LT3502A)
I
DA
< 500mA (LT3502A)
I
DA
< 500mA (LT3502)
I
DA
< 500mA (LT3502)
100mA Load (LT3502A)
100mA Load (LT3502)
I
SW
= 500mA
(Note 3)
SW = 10V (Note 4)
SW = 0V (Note 5)
I
SW
= 500mA
I
SW
= 500mA
I
OUT
= 100mA
500
V
SHDN
= 5V
V
SHDN
= 0V
2
0.3
0.75
●
●
The
●
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. V
IN
= 10V, V
SHDN
= 5V, V
BOOST
= 15V.
CONDITIONS
MIN
2.6
TYP
2.8
0.5
1.5
0.785
0.79
0.780
0.786
0.8
0.8
0.8
0.8
0.005
●
●
●
MAX
3
2
2
0.813
0.81
0.816
0.813
50
2.7
2.8
1.3
1.4
UNITS
V
μA
mA
V
V
V
V
%/V
nA
MHz
MHz
MHz
MHz
%
%
mV
Reference Voltage Line Regulation
FB Pin Bias Current
Switching Frequency
1.9
1.8
0.9
0.8
70
80
15
2.25
2.25
1.1
1.1
80
90
450
0.9
95
8
10
1.9
0.8
650
55
Maximum Duty Cycle
Switch V
CESAT
Switch Current Limit
Switch Active Current
BOOST Pin Current
Minimum BOOST Voltage Above Switch
BOOST Schottky Forward Drop
DA Pin Current to Stop OSC
SHDN
Bias Current
SHDN
Input Voltage High
SHDN
Input Voltage Low
1.1
130
30
13
2.2
1
80
1
A
μA
μA
mA
V
V
mA
μA
μA
V
V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2.
The LT3502EDC and LT3502AEDC are guaranteed to meet
performance specifications from 0°C to 125°C junction temperature
range. Specifications over the –40°C to 125°C operating junction
temperature range are assured by design, characterization and correlation
with statistical process controls. The LT3502IDC and LT3502AIDC are
guaranteed over the – 40°C to 125°C operating junction temperature
range.
Note 3:
Current limit guaranteed by design and/or correlation to static test.
Slope compensation reduces current limit at higher duty cycle.
Note 4:
Current flows into pin.
Note 5:
Current flows out of pin.
3502fc
3
LT3502/LT3502A
TYPICAL PERFORMANCE CHARACTERISTICS
LT3502A 3.3V
OUT
Efficiency
90
80
70
EFFICIENCY (%)
60
50
40
30
20
10
0
0
0.1
0.3
0.2
LOAD CURRENT (A)
0.4
0.5
3502 G01
(T
A
= 25°C unless otherwise noted)
LT3502A 5V
OUT
Efficiency
90
100
90
12V
IN
24V
IN
EFFICIENCY (%)
80
70
60
50
40
30
20
10
0
0
0.1
0.3
0.2
LOAD CURRENT (A)
0.4
0.5
3502 G02
LT3502 3.3V
OUT
Efficiency
5V
IN
12V
IN
80
70
EFFICIENCY (%)
60
50
40
30
20
10
0
24V
IN
24V
IN
12V
IN
0
0.1
0.3
0.4
0.2
LOAD CURRENT (A)
0.5
3502 G03
LT3502 5V
OUT
Efficiency
100
90
80
EFFICIENCY (%)
70
60
50
40
30
20
10
0
0
0.1
0.3
0.4
0.2
LOAD CURRENT (A)
0.5
3502 G04
LT3502A Maximum Load Current
V
OUT
= 3.3V, L = 6.8μH
1.0
1.0
TYPICAL
LOAD CURRENT (A)
MINIMUM
0.9
0.9
0.8
LOAD CURRENT (A)
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
10
20
V
IN
(V)
30
40
3502 G05
LT3502A Maximum Load Current
V
OUT
= 5V, L = 10μH
TYPICAL
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
10
20
V
IN
(V)
30
40
3502 G06
12V
IN
24V
IN
MINIMUM
LT3502 Maximum Load Current
V
OUT
= 3.3V, L = 15μH
0.9
0.8
0.7
LOAD CURRENT (A)
0.6
0.5
0.4
0.3
0.2
0.1
0
0
10
20
V
IN
(V)
3502 G07
LT3502 Maximum Load Current
V
OUT
= 5V, L = 22μH
0.9
700
TYPICAL
0.7
LOAD CURRENT (A)
0.6
0.5
0.4
0.3
0.2
0.1
100
0
0
10
20
V
IN
(V)
3502 G08
Switch Voltage Drop
600
500
V
CE
(mV)
400
300
200
25°C
125°C
TYPICAL
MINIMUM
0.8
MINIMUM
–40°C
30
40
0
30
40
0
0.2
0.4
0.6
0.8
1.0
3502 G09
SWITCH CURRENT (A)
3502fc
4
LT3502/LT3502A
TYPICAL PERFORMANCE CHARACTERISTICS
UVLO
3.5
3.0
FREQUENCY (MHz)
2.5
V
IN
(V)
2.0
1.5
1.0
0.5
0
–50
SWITCH CURRENT LIMIT (A)
2.0
2.5
LT3502A
(T
A
= 25°C unless otherwise noted)
Switching Frequency
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
100
TEMPERATURE (°C)
50
150
3502 G10
Soft-Start (SHDN)
1.5
LT3502
1.0
0.5
0
–50
–0.1
0
100
TEMPERATURE (°C)
50
150
3502 G11
0
200 400 600 800 1000 1200 1400 1600
SHDN
PIN VOLTAGE (mV)
3502 G12
SHDN
Pin Current
300
250
SHDN
PIN CURRENT (μA)
CURRENT LIMIT (A)
200
150
100
50
0
0
5
10
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
15 20 25 30 35
SHDN
PIN VOLTAGE (V)
40
45
Switch Current Limit
1.2
1.0
CURRENT LIMIT (A)
Switch Current Limit
SW PEAK CURRENT LIMIT
DA VALLEY CURRENT LIMIT
LT3502
0.8
0.6
0.4
0.2
0
0
50
DUTY CYCLE (%)
100
3502 G15
LT3502A
0
–50
0
50
100
TEMPERATURE (°C)
150
3502 G14
3502 G13
LT3502A Maximum V
IN
for Full
Frequency (V
OUT
= 3.3V)
45
40
35
30
V
IN
(V)
25
20
15
10
5
0
0
0.1
0.2 0.3 0.4 0.5
LOAD CURRENT (A)
0.6
0.7
T
A
= 85°C
V
IN
(V)
T
A
= 25°C
45
40
35
30
LT3502A Maximum V
IN
for Full
Frequency (V
OUT
= 5V)
45
40
35
30
T
A
= 85°C
V
IN
(V)
T
A
= 25°C
25
20
15
10
5
0
0
0.1
0.2 0.3 0.4 0.5
LOAD CURRENT (A)
0.6
0.7
LT3502 Maximum V
IN
for Full
Frequency (V
OUT
= 3.3V)
25
20
15
10
5
0
T
A
= 25°C
T
A
= 85°C
0
0.1
0.2 0.3 0.4 0.5
LOAD CURRENT (A)
0.6
0.7
3502 G16
3502 G17
3502 G18
3502fc
5
查看更多>
读好书《电子工程师自学手册》- 内容初探
笔者看书的习惯是先看前言再看目录，本书也不例外，先从前言看起，至少从这边可以了解到...
懒猫爱飞 综合技术交流
分享一本国外的vi编辑器使用的教程书，中文版
百度云　 http://pan.baidu.com/s/1bXOM1C 分享一本国外的vi编辑器使...
白手梦想家 Linux与安卓
第一次做工控，请教wincc里面怎么写脚本设置控件的tag值
如题，即用vbs动态设置tag。查了半天没有看到控件的tag属性，不知道编程咋个实现，请给个代码，谢...
liu0911 嵌入式系统
史上最全的MSP432常见问题解答（MSP432 FAQ）
本 FAQ 旨在解决人们对于新型MSP432P4xx MCU 有可能存在的最常见的问题。请先阅读这...
maylove 微控制器 MCU
初学者学嵌入式的学习计划
只会一些编程语言的初级知识，如何学嵌入式阿 初学者学嵌入式的学习计划 这个很多人问过，你搜索一下吧。...
changelocation 嵌入式系统
KiCAD异性焊盘的难题
最近用到TI的一款电源芯片，使用TI官方的Ultra Librarian封装库生成了KiCAD的封...
littleshrimp PCB设计
热门器件
热门资源推荐
汽车图像传感器在行车安全等方面的应用 CONTINUOUS-TIME SIGMA-DELTA MODULATION FOR AD CONVERSION IN RADIO RECEIVERS 电子元件失效分析案例 中兴通讯硬件一部巨作-信号完整性 66页 0.7M 超清书签版 串口实验程序 基于移动GIS的应急救援指挥系统的设计与实现 ads1.2的一个工程 12864液晶资料 双网传真机中网络传真模块的设计与实现 RC522射频模块pcb
在RISC-V上使用RT-Thread完全学习手册(基于龙眼Longan开发板) 重新赠送打卡机（供拆机学习用）给需要的网友 单片机AD采集不准确 Wince6.0下面检测到SD卡后串口提示响应超时，但是SD卡可以正常识别和使用，请高手指点如何才能解决响应超时的问题 红色系列（一） GPRS以及CDMA 在wince上的问题求助 波特率的问题 大牛浅谈常用三极管经验秘籍（张飞电子）！ STM32F051驱动LCD1602程序，及注意事项。 5G时代的另类赢家
简洁的过零调功器电路设计与分析 单稳态控制电路设计与分析 光控电路设计与分析 永不缺相启动运行的电动机控制电路 IGBT模块通过控制门极阻断过电流 MT3608构成3.7V转12V的升压电路图 运算放大器IC741的基本工作原理及在电路中的实现方式 比较常见的功率整流器和滤波电路 一个简单的红外耳机电路 基于TDA1554的立体声放大器电路
器件捷径:
A0 A1 A2 A3 A4 A5 A6 A7 A8 A9 AA AB AC AD AE AF AG AH AI AJ AK AL AM AN AO AP AQ AR AS AT AU AV AW AX AY AZ B0 B1 B2 B3 B4 B5 B6 B7 B8 B9 BA BB BC BD BE BF BG BH BI BJ BK BL BM BN BO BP BQ BR BS BT BU BV BW BX BY BZ C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 CA CB CC CD CE CF CG CH CI CJ CK CL CM CN CO CP CQ CR CS CT CU CV CW CX CY CZ D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 DA DB DC DD DE DF DG DH DI DJ DK DL DM DN DO DP DQ DR DS DT DU DV DW DX DZ
需要登录后才可以下载。
登录取消