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参数资料
| 型号： | MAX1579ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 4/13页 |
| 文件大小： | 0K |
| 描述： | IC PS BIAS/WHITE LED TFT 24-TQFN |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 应用： | LCD 显示器 |
| 电流 - 电源： | 3mA |
| 电源电压： | 2.7 V ~ 5.5 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-TQFN-EP（4x4） |
| 包装： | 带卷 (TR) |
Complete Bias and White LED Power Supplies
for Small TFT Displays
ELECTRICAL CHARACTERISTICS (continued)
(Circuit of Figure 3, V IN = 3V, CTRL = ONBIAS = IN, T A = -40 ° C to +85 ° C, typical values are at T A = +25 ° C, unless otherwise noted. Note 1)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
N-CHANNEL SWITCH
LX On-Resistance
I LX = 190mA
0.82
1.5
Ω
LX Leakage Current
LX Current Limit
V LX = 28V, CTRL = GND
Duty cycle = 90%
T A = +25°C
T A = +85°C
500
0.01
1
700
5
900
μA
mA
Note 1: All devices are 100% production tested at T A = +25 ° C. Limits over the operating temperature range are guaranteed by design.
Note 2: V D1 is the forward-voltage drop of diode D1 in Figure 3.
Note 3: Time from CTRL going below the Dual-Mode threshold to IC shutdown.
Typical Operating Characteristics
(Circuit of Figure 3, V IN = 3.6V, I LED = 20mA, 4 LEDs, CTRL = IN, T A = +25 ° C, unless otherwise noted.)
90
LED EFFICIENCY vs. I LED
90
LED EFFICIENCY vs. V IN
85
6 LEDs
4 LEDs
85
I LED = 20mA
80
80
75
70
65
60
55
50
2 LEDs
8 LEDs
75
70
65
60
55
50
I LED = 10mA
I LED = 2mA
0
5
10
15
20
25
2.5
3.0
3.5
4.0
4.5
5.0
5.5
30
LED CURRENT (mA)
LED CURRENT vs. TEMPERATURE
25
INPUT VOLTAGE (V)
LED CURRENT vs. V CTRL
25
MAX1579
R CS = 13 Ω
20
20
15
15
MAX1578
10
5
R CS = 22 Ω
10
5
0
-40
-15
10
35
60
85
0
0
0.5
1.0
1.5
2.0
2.5
TEMPERATURE ( ° C)
CTRL VOLTAGE (V)
4
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