参数资料
型号: LT1939EDD#PBF
厂商: Linear Technology
文件页数: 2/24页
文件大小: 349K
描述: IC REG DL BUCK/LINEAR 12DFN
标准包装: 121
拓扑: 降压(降压)(1),线性(LDO)(1)
功能: 任何功能
输出数: 2
频率 - 开关: 500kHz ~ 2.4MHz
电压/电流 - 输出 1: 0.8 V ~ 24.25 V,2A
电压/电流 - 输出 2: 0.8 V ~ 24.25 V,1A
带 LED 驱动器:
带监控器:
带序列发生器:
电源电压: 3 V ~ 25 V
工作温度: -40°C ~ 125°C
安装类型: 表面贴装
封装/外壳: 12-WFDFN 裸露焊盘
供应商设备封装: 12-DFN
包装: 管件
LT1939
2
1939f
 
The l denotes the speci cations which apply over the full operating
temperature range, otherwise speci cations are at T
J
 = 25癈. V
VIN
 = 15V, V
RT/SYNC
 = 2V, unless otherwise speci ed.
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
V
IN
, PG, PG Operating ....................................25V/0.3V
SW .............................................................................V
IN
BST ................................................................45V/0.3V
BST Pin Above SW ....................................................25V
LDRV, SHDN ..............................................................15V
FB, LFB, R
T
/SYNC .......................................................5V
SS, V
C
 ......................................................................2.5V
Operating Junction Temperature Range (Notes 2, 6)
  LT1939EDD ........................................40癈 to 125癈
  LT1939IDD .........................................40癈 to 125癈
Storage Temperature Range ...................65癈 to 150癈
(Note 1)
TOP VIEW
DD PACKAGE
12-LEAD
3mm ?3mm PLASTIC DFN
12
13
11
8
9
10
4
5
3
2
1
SW
BST
LDRV
LFB
FB
PG
V
IN
SHDN
SS
PG
V
C
R
T
/SYNC
6
7
?/DIV>
JA
 = 45癈/W, ?/DIV>
JC(PAD)
 = 10癈/W
EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LT1939EDD#PBF
LT1939IDD#PBF
LT1939EDD#TRPBF
LT1939IDD#TRPBF
LDJZ
LDJZ
12-Lead (3mm ?3mm) Plastic DFN
12-Lead (3mm ?3mm) Plastic DFN
40癈 to 125癈
40癈 to 125癈
Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based  nish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/ 
For more information on tape and reel speci cations, go to: http://www.linear.com/tapeandreel/
PARAMETER
CONDITIONS
MIN   TYP   MAX  UNITS
SHDN Threshold
l
710   760   780    mV
SHDN Source Current
1.5    2.5    3.5    糀
SHDN Current Hysterisis
1.25    2    3.25    糀
Minimum Input Voltage (Note 3)
V
FB
 = 0V
l
2.4    2.8
V
Supply Shutdown Current
V
SHDN
 = 0V
l
12    30
Supply Quiescent Current
V
FB
 = 0.9V
2.5    3.5    mA
FB Voltage
V
VC
 = 1V
V
VC
 = 0.6V to 1.6V, V
IN
 = 3V to 25V
l
l
0.784
0.776
0.8
0.8
0.816
0.824
V
V
FB Bias Current
V
FB
 = 0.8V, V
VC
 = 1V
50    150    nA
Error Ampli er g
m
V
VC
 = 1V, I
VC
 = ?0糀
150   250   350   糾ho
Error Ampli er Source Current
V
FB
 = 0.6V, V
VC
 = 1V
12    16    20
Error Ampli er Sink Current
V
FB
 = 1V, V
VC
 = 1V
14    18    22
Error Ampli er High Clamp
V
FB
 = 0.6V
1.8    2.0    2.2
V
Error Ampli er Switching Threshold
V
FB
 = 0.6V
0.6    0.8    1.0
V
SS Source Current
V
SHDN
 = 1V, V
SS
 = 0.4V, V
FB
 = 0.9V
2.25   2.75   3.75    糀
ORDER INFORMATION
ELECTRICAL CHARACTERISTICS
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