参数资料
| 型号： | LT1942EUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/16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
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
LED1-LED2 Current Matching
LED1 Voltage
LED2 Voltage
LED1, LED2 Maximum Current
CONDITIONS
Current Into Each Pin = 20mA, V LED1 = V LED2
Current Into Each Pin = 20mA, |V LED1 -V LED2 | = 1V
20mA Into Pin, V LED2 = 2V, FB4 = 0
20mA Into Pin, V LED1 = 2V, FB4 = 0
Into Either Pin, V LEDX < 1.5V, FB4 = 0
MIN
35
TYP
0
1
1
1
MAX
1.5
2.5
1.2
1.2
UNITS
%
%
V
V
mA
LED1, LED2 Leakage Current
AV DD Maximum Duty Cycle
V OFF Maximum Duty Cycle
V ON Maximum Duty Cycle
LED Maximum Duty Cycle
V SHDN = 0V, V LEDX = 45V
SW1 Pin
SW2 Pin
SW3 Pin
SW4 Pin
●
88
75
75
88
93
86
86
93
1
μ A
%
%
%
%
AV DD Switch Current Limit at Minimum DC (SW1)
AV DD Switch Current Limit at Maximum DC (SW1)
V OFF Switch Current Limit at Minimum DC (SW2)
V OFF Switch Current Limit at Maximum DC (SW2)
V ON Switch Current Limit at Minimum DC (SW3)
V ON Switch Current Limit at Maximum DC (SW3)
LED Switch Current Limit at Minimum DC (SW4)
LED Switch Current Limit at Maximum DC (SW4)
V OFF Schottky Diode Forward Drop
V OFF Schottky Diode Leakage Current
V ON Schottky Diode Forward Drop
V ON Schottky Diode Leakage Current
LED Schottky Diode Forward Drop
LED Schottky Diode Leakage Current
Switching Frequency
SHDN Pin Current
CTRL4 Pin Current
SW1-SW4 leakage Current
SW1 V CESAT
SW2 V CESAT
SW3 V CESAT
SW4 V CESAT
SS1 Charging Current
SS4 Charging Current
SW1 Pin (Note 4)
SW1 Pin (Note 4)
SW2 Pin (Note 4)
SW2 Pin (Note 4)
SW3 Pin (Note 4)
SW3 Pin (Note 4)
SW4 Pin (Note 4)
SW4 Pin (Note 4)
D2 Pin, I = 60mA
D2 Pin, V D2 = –36V
D3 Pin, I = 60mA
V D3 = 36V, SW3 = 0V, Output Disconnect PNP Off
I = 250mA
V D4 = 36V, SW4 = 0V
V SHDN = 3V
V SHDN = 0V
V CTRL4 = 3V
V CTRL4 = 0V
V SWX = 36V
I SW1 = 100mA (Note 5)
I SW2 = 40mA (Note 5)
I SW3 = 40mA (Note 5)
I SW4 = 400mA (Note 5)
V SS = 0.5V
V SS = 0.5V
●
●
●
●
●
●
150
80
50
30
50
30
550
450
0.8
1
1
200
140
80
60
80
60
750
600
0.65
0.65
0.75
1
70
20
30
–60
0.01
200
150
150
280
3
3
250
200
110
90
110
90
900
850
1
1
1
1.2
100
30
60
–150
1
300
250
250
400
5
5
mA
mA
mA
mA
mA
mA
mA
mA
V
μ A
V
μ A
V
μ A
MHz
μ A
nA
μ A
nA
μ A
mV
mV
mV
mV
μ A
μ A
SHDN Input Voltage High
SHDN Input Voltage Low
CTRL4 Input Voltage High
CTRL4 Input Voltage Low
1
0.25
0.4
0.1
V
V
V
V
1942fb
3
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