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參數(shù)資料
| 型號： | LT3513EUHF#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.5 A SWITCHING REGULATOR, 2220 kHz SWITCHING FREQ-MAX, PQCC38 |
| 封裝： | 5 X 7 MM, LEAD FREE, PLASTIC, MO-220WHKD, QFN-38 |
| 文件頁數(shù)： | 3/22頁 |
| 文件大?。?/td> | 374K |
| 代理商： | LT3513EUHF#PBF |
LT3513
11
3513fc
The LT3513 is a highly integrated power supply IC contain-
ing four separate switching regulators and a low dropout
linear regulator (LDO). Switching regulator 1 is a step-
down 2.2A regulator with inductor current sense and an
integratedboostSchottkydiode.Switchingregulator 2can
be configured as a step-up or SEPIC converter and has a
1.5A switch. Switching regulator 3 consists of a step-up
regulator with a 0.25A switch as well as an integrated
Schottky diode. Switching regulator 4 is a negative regula-
tor with a switch current limit of 0.25A and an integrated
Schottky diode. Linear regulator 5 is capable of providing
8mA of current to the base of an external NPN transistor.
The regulators share common circuitry including input
source, voltage reference and master oscillator. Operation
can be best understood by referring to the Block Diagram
as shown in Figure 1.
If the RUN-SS1 pin is pulled to ground, the LT3513 is shut
down and draws 30A from the input source tied to VIN.
An internal 2A current source charges the external soft-
start capacitor, generating a voltage ramp at this pin. If the
RUN-SS1 pin exceeds 0.8V, the internal bias circuits turn
on, including the internal regulator, reference and 2MHz
master oscillator. The master oscillator generates four
clock signals, one for each of the switching regulators.
Switching regulator 1 will only begin to operate when the
RUN-SS1 pin reaches 0.8V. Switcher 1 generates VLOGIC,
whichmustbetiedtotheBIASpin.WhenBIASreaches2.8V,
the NPNs pulling down on the RUN-SS2 and RUN-SS3/4
pins turns off, allowing an internal 2A current source
to charge the external capacitors tied to RUN-SS2 and
RUN-SS3/4 pins. When the voltage on RUN-SS2 reaches
0.8V, switcher 2 is enabled. Correspondingly, when the
voltage on RUN-SS3/4 reaches 0.8V, switchers 3 and 4
are enabled. AVDD, E3 and VOFF will then begin rising at a
rate determined by the capacitors tied to the RUN-SS2 and
RUN-SS3/4 pins. When all four switching outputs reach
90% of their programmed voltages, the NPN pulling down
on the CT pin will turn off, and an internal 20A current
source will charge the external capacitor tied to the CT pin.
When the CT pin reaches 1.1V, the output disconnect PNP
turns on, connecting VON to E3. In the event of any of the
four outputs dropping below 90% of their programmed
voltage, PanelProtect circuitry pulls the CT pin to GND,
disabling VON.
(2a)
(2b)
Figure 2. LT3513 Power-Up Sequence. (Traces from Both Photos
are Synchnonized to the Same Trigger)
RUN-SS 2V/DIV
VLOGIC 5V/DIV
IL1 1A/DIV
IL2 500A/DIV
SS-234 2V/DIV
AVDD 10V/DIV
PGOOD 20V/DIV
5ms/DIV
3513 F02a
VOFF 10V/DIV
VSS3/4 2V/DIV
VCT 2V/DIV
IL4 500mA/DIV
IL3 500mA/DIV
VE3 20V/DIV
VON 20V/DIV
5ms/DIV
3513 F02b
operaTion
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| LT3513IUHF#TRPBF | 3.5 A SWITCHING REGULATOR, 2220 kHz SWITCHING FREQ-MAX, PQCC38 |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT3513EUHF-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2MHz High Current 5-Output Regulator for TFT-LCD Panels |
| LT3513IUHF#PBF | 功能描述:IC REG 5-OUT FOR TFT-LCD 38QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用: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 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LT3513IUHF#TRPBF | 功能描述:IC REG 5-OUT FOR TFT-LCD 38QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用: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 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LT3513IUHF-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2MHz High Current 5-Output Regulator for TFT-LCD Panels |
| LT3513IUHF-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:2MHz High Current 5-Output Regulator for TFT-LCD Panels |
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