参数资料
| 型号： | LT1947EMSE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 3/12页 |
| 文件大小： | 0K |
| 描述： | IC REG TFT-LCD ADJ 10-MSOP |
| 标准包装： | 2,500 |
| 应用： | 转换器，TFT，LCD |
| 输入电压： | 2.7 V ~ 8 V |
| 输出数： | 3 |
| 输出电压： | 最高可调至 30V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
| 包装： | 带卷 (TR) |
LT1947
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 = 3.3V unless otherwise specified.
SYMBOL
Error Amplifier Voltage Gain
C T Current Source
C T Threshold to Turn On Q3
FB1 Voltage to Begin C T Charge
SW1 Current Limit
SW2 Current Limit
SW1 Saturation Voltage
SW2 Saturation Voltage
CONDITIONS
EA1 and EA2
V FB1 = 1.3V
(Note 3)
(Note 3)
I SW1 = 800mA
I SW2 = 300mA
MIN
4
1.25
1.17
1.1
0.35
TYP
100
5.5
1.28
1.2
1.4
0.6
0.230
0.3
MAX
6.5
1.30
1.23
2
1
0.280
0.36
UNITS
V/V
μ A
V
V
A
A
V
V
SW1 Maximum Duty Cycle
SW2 Maximum Duty Cycle
82
85
%
%
Oscillator Frequency
V ON Switch Drop
SW1 Leakage Current
SW2 Leakage Current
SHDN Pin Bias Current
I Q3 = 7mA
Switch Off, SW1 = 3.3V
Switch Off, SW2 = 3.3V
V SHDN = 2.4V
●
2.3
3
160
0.01
0.01
10
3.5
200
5
5
25
MHz
mV
μ A
μ A
μ A
SHDN Pin High
SHDN Pin Low
Active Mode
Shutdown Mode
2.4
0.4
V
V
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: The LT1947 is guaranteed to meet performance specifications
from 0 ° C to 70 ° C. Specifications over the – 40 ° C to 85 ° C operating
temperature range are assured by design, characterization and correlation
with statistical process controls.
Note 3: Switch current limit guaranteed by design and/or correlation to
static tests.
TYPICAL PERFOR A CE CHARACTERISTICS
85
3.3V TFT-LCD Converter Efficiency
12
Supply Current
–2
C T Current Source
80
75
V IN = 3.3V
10
SHDN = 2.4V
–4
70
65
V IN = 3V
V IN = 2.7V
60
55
50
45
40
8
6
–6
–8
35
0
25
50
75 100 125 150 175 200
4
–50
–25
0 25 50
75
100
–10
–50
–25
0 25 50
75
100
AV DD LOAD CURRENT (mA)
1947 G01
TEMPERATURE ( ° C)
1947 G02
TEMPERATURE ( ° C)
1947 G03
1947fa
3
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