参数资料
| 型号： | LT1942EUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | IC REG SW QUAD TFT LCD 24-QFN |
| 标准包装： | 2,500 |
| 应用： | 转换器，TFT |
| 输入电压： | 2.6 V ~ 16 V |
| 输出数： | 4 |
| 输出电压： | 1.25 V ~ 36 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-WFQFN 裸露焊盘 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
| 包装： | 带卷 (TR) |
LT1942
ABSOLUTE
AXI U
RATI GS
PACKAGE/ORDER I FOR ATIO
(Note 1)
V CC Voltage............................................................. 16V
SW1, SW2, SW3 Voltage .......................... –0.4V to 36V
TOP VIEW
ORDER PART
NUMBER
SW4 .......................................................... –0.4V to 45V
FB1, FB3 Voltage ................................................... 2.5V
FB4 Voltage ....................................................... 400mV
NFB2 Voltage ................................................... –200mV
SHDN Voltage ......................................................... 10V
PGND23 1
SW3 2
D3 3
V OUT3 4
24 23 22 21 20 19
25
18 LED1
17 LED2
16 D4
15 FB4
LT1942EUF
CTRL4 Voltage ........................................................ 16V
SS1, SS4 Voltage .................................................. 1.5V
Current Into D2 ......................................................... 1A
D2 Voltage ............................................................ –36V
FB3 5
NFB2 6
7
8
9 10 11 12
14 FB1
13 PGOOD
UF PART
MARKING
1942
Current Out of D3 ..................................................... 1A
D3 Voltage .............................................................. 36V
Current Out of D4 ..................................................... 4A
D4 Voltage .............................................................. 45V
LED1, LED2 Voltage ............................................... 45V
Current Into LED1, LED2 ..................................... 35mA
PGOOD Voltage ...................................................... 16V
V OUT3 Voltage ......................................................... 36V
CT Current ........................................................... ± 1mA
Maximum Junction Temperature ......................... 125 ° C
Operating Temperature Range (Note 2) .. – 40 ° C to 85 ° C
Storage Temperature Range ................ – 65 ° C to 125 ° C
UF PACKAGE
24-LEAD (4mm × 4mm) PLASTIC QFN
T JMAX = 125 ° C, θ JA = 37 ° C/W, θ JC = 4.3 ° C/W
EXPOSED PAD (PIN 25) IS SGND
(MUST BE SOLDERED TO PCB)
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specified with wider operating temperature ranges.
ELECTRICAL CHARACTERISTICS The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T A = 25 ° C. V IN = 3.3V, V SHDN = V IN , unless otherwise noted. (Note 2)
PARAMETER
Quiescent Current
CONDITIONS
V SHDN = 3.3V, V CTRL4 = 0V, Not Switching
V SHDN = V CTRL4 = 0V, In Shutdown
●
●
MIN
TYP
7
0
MAX
10
1
UNITS
mA
μ A
Input Voltage Range
V CC Pin
●
2.6
16
V
AV DD Feedback Voltage
AV DD Feedback Pin Bias Current (FB1)
AV DD Feedback Voltage for Power Good Signal
V OFF Feedback Voltage
V OFF Feedback Pin Bias Current (NFB2)
V ON Feedback Voltage
V ON Feedback Pin Bias Current (FB3)
LED Feedback Voltage
LED Feedback Pin Bias Current (FB4)
LED Feedback Voltage with Dimming
FB1 Pin
FB1 Pin (Note 3)
FB1 Pin Voltage as a Percent of Nominal Voltage
NFB2 Pin
NFB2 Pin (Note 3)
FB3 Pin
FB3 Pin (Note 3)
FB4 Pin, V CTRL4 = 3.3V
FB4 Pin (Note 3)
FB4 Pin, V CTRL4 = 1V
●
●
●
1.225
95
–160
1.225
190
85
1.25
15
97
–150
25
1.25
25
200
20
95
1.275
60
100
–140
60
1.275
60
210
60
105
V
nA
%
mV
nA
V
nA
mV
μ A
mV
1942fb
2
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