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参数资料
| 型号： | MAX1579ETG+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/13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
Pin Description (continued)
PIN
11
12
13
14
15
16
17
18
19
20
21
22
23
24
—
NAME
ONBIAS
GND
COMP
CS
CTRL
OUT
LX
PGND
C1N
C2N
IN
C2P
C1P
V DD
EP
FUNCTION
Logic Input to Enable V DD , MAIN, POS, and NEG Charge Pumps. Drive ONBIAS high to enable all the
charge pumps. Connect to GND to disable the charge pumps.
Ground. Connect to PGND and the exposed pad directly under the IC.
LED Driver Compensation. Connect a 0.1μF from COMP to GND. C COMP stabilizes the driver and
sets the soft-start time.
Current-Sense Feedback Input. Connect a resistor from CS to GND to set the LED current. For the
MAX1578, CS regulates to V CTRL / 5 or 0.327V, whichever is lower. For the MAX1579, CS regulates to
V CTRL / 5 or 0.340V, whichever is lower.
LED Brightness Control Input. Connect CTRL to a 0.24V to 1.65V input to set the brightness of the
external LEDs. Hold CTRL below 100mV for more than 10.5ms, to shut down the LED driver. Drive CTRL
with a 200Hz to 200kHz unfiltered PWM dimming signal for DC LED current that is proportional to the
signal’s duty cycle.
Overvoltage Sense Input. The MAX1578/MAX1579 turn off the n-channel MOSFET when V OUT exceeds 34V.
Once V OUT drops below 32V, the IC re-enters soft-start. Bypass OUT to GND with a 0.1μF capacitor.
Inductor Connection. Connect to the switched side of the external inductor as well as the anode of the
external diode. LX is high impedance during shutdown.
Power Ground. Connect to GND and the exposed pad directly under the IC.
Main Charge-Pump Transfer Capacitor Negative Connection 1. Connect a 2.2μF capacitor between
C1N and C1P.
Main Charge-Pump Transfer Capacitor Negative Connection 2. Connect a 2.2μF capacitor between
C2N and C2P.
Power-Supply Input. Connect to a 2.7V to 5.5V input supply. Bypass IN to GND with a 4.7μF capacitor.
Main Charge-Pump Transfer Capacitor Positive Connection 2. Connect a 2.2μF capacitor between
C2P and C2N.
Main Charge-Pump Transfer Capacitor Positive Connection 1. Connect a 2.2μF capacitor between
C1P and C1N.
Regulated Main Charge-Pump Output. V DD is regulated to 5.5V. Bypass V DD to GND with a 4.7μF
capacitor. V DD is connected to IN when ONBIAS is pulled low.
Exposed Paddle. Connect directly to a ground plane, GND, and PGND directly under the IC.
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| MAX157ACUA+ | 功能描述:模数转换器 - ADC 10-Bit 2Ch 108ksps 5.25V Precision ADC RoHS:否 制造商:Texas Instruments 通道数量:2 结构:Sigma-Delta 转换速率:125 SPs to 8 KSPs 分辨率:24 bit 输入类型:Differential 信噪比:107 dB 接口类型:SPI 工作电源电压:1.7 V to 3.6 V, 2.7 V to 5.25 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-32 |
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