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參數(shù)資料
| 型號： | LT1942EUF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Quad DCDC Converter for Triple Outputs TFT Supply Plus LED Driver |
| 中文描述： | 4 A SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, 0.75 MM HEIGHT, PLASTIC, MO-220WGGD, QFN-24 |
| 文件頁數(shù)： | 7/16頁 |
| 文件大?。?/td> | 248K |
| 代理商： | LT1942EUF |
LT1942
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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
97% of its final value.
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.
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相關(guān)代理商/技術(shù)參數(shù) |
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| LT1942EUF#PBF | 功能描述:IC REG SW QUAD TFT LCD 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LT1942EUF#TRPBF | 功能描述:IC REG SW QUAD TFT LCD 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標(biāo)準(zhǔn)包裝:43 系列:- 應(yīng)用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數(shù):1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:48-QFN（7x7） 包裝:管件 |
| LT1942EUFPBF | 制造商:Linear Technology 功能描述:Conv DC-DC Quad Inv/Step-Up 16V QFN24EP |
| LT1943 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Quad DCDC Converter for Triple Outputs TFT Supply Plus LED Driver |
| LT1943_1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Current Quad Output Regulator for TFT LCD Panels |
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