参数资料
| 型号： | LT1942EUF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/16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
PI FU CTIO S
PGND23 (Pin 1): Power Ground for V OFF and V ON Switcher.
Tie directly to local ground plane.
SW3 (Pin 2): Switch Pin for V ON Switcher. This is the
collector of an internal NPN power switch. Minimize the
metal trace area connected to this pin to minimize EMI.
D3 (Pin 3): Output of V ON Switcher. Place output decoup-
ling capacitor from this pin to local ground plane.
V OUT3 (Pin 4): Collector of Internal Output Disconnect
PNP Transistor for the V ON Switcher. Place a capacitor
from this pin to local ground plane of at least 0.1 μ F.
FB3 (Pin 5): Feedback Pin for V ON Switcher. Reference
voltage is 1.25V. Connect resistive divider tap here.
Minimize trace area at FB3. Set V OUT3 according to V OUT3
= 1.25(1 + R5/R6).
NFB2 (Pin 6): Feedback Pin for V OFF Switcher. Reference
voltage is –150mV. Connect resistive divider tap here.
Minimize trace area at NFB2. Set V OUT2 according to
V OUT2 = (– 0.15)(1 + R3/R4).
SHDN (Pin 7): Shutdown. Tie to 1V or greater to enable the
part. Tie to 0.4V or lower to disable. This pin is the global
shutdown pin for all four switching regulators.
CTRL4 (Pin 8): Shutdown for the LED Switcher. Tie to
0.25V or greater to enable the LED switcher. Tie to 0.1V or
lower to disable. CTRL4 can also override the default 200mV
reference for the LED switcher. If CTRL4 is tied to 2.5V or
greater, the reference voltage is 200mV. If CTRL4 is less
than 2.5V, the LED reference voltage is approximately
V CTRL4 /10. This allows an 8:1 dimming range for the LEDs.
Refer to the Applications Section for more information.
CT (Pin 9): Programmable Delay for the TFT Supplies.
Place a capacitor from this pin to local ground plane. After
the delay, the output disconnect PNP for the V ON supply is
turned on. The delay time is initiated when AV DD reaches
AGND (Pin 10): Analog Ground. Tie directly to local
ground plane.
SS1 (Pin 11): Soft-Start Pin for AV DD Switcher. Place a
soft-start capacitor from this pin to ground. Upon start-up,
3 μ A of current charges the capacitor to 1.25V. Use larger
capacitor for slower start-up. Leave floating if not in use.
SS4 (Pin 12): Soft-Start for LED Switcher. Place a soft-
start capacitor from this pin to ground. Upon start-up, 3 μ A
of current charges the capacitor to 1.25V. Use larger
capacitor for slower start-up. Leave floating if not in use.
PGOOD (Pin 13): Power Good Indication for AV DD Switcher.
Open-collector NPN. Stays open until the V FB1 voltage
reaches 97% of target value at which point the pin will pull
down.
FB1 (Pin 14): Feedback Pin for AV DD Switcher. Connect
resistive divider tap here. Minimize trace area at FB1. Set
V OUT1 according to V OUT1 = 1.25(1 + R1/R2).
FB4 (Pin 15): Feedback Pin for LED Switcher. Place a
resistor from this node to ground. Choose R7 to set LED
current (I LED ) according to the following formula:
if V CTRL4 ≥ 2.5V, R7 = 0.2/I LED
In this case, I LED is the total LED current. If two strings of
LEDs are used, I LED is the sum of the current in the two
strings. If only a single string of LEDs is used, I LED is
simply the single string current. For dimming LED current,
drive V CTRL4 to a lower voltage. See the Applications
Section for more information.
D4 (Pin 16): Output of LED Switcher. Place output de-
coupling capacitor from this pin to local ground plane.
LED2 (Pin 17): Second Input of Current Mirror for an LED
String. Connect the negative end of second string of LEDs
to this pin. If not in use, leave floating.
97% of its final value.
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| LT1943EFE | 功能描述:IC REG SW QUAD TFT LCD 28-TSSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| LT1943EFE#PBF | 功能描述:IC REG SW QUAD TFT LCD 28-TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
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