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參數資料
| 型號： | LM25119PSQX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, QCC32 |
| 封裝： | 5 X 5 MM, LLP-32 |
| 文件頁數： | 1/24頁 |
| 文件大小： | 694K |
| 代理商： | LM25119PSQX |
LM25119
September 28, 2010
Wide Input Range Dual Synchronous Buck Controller
General Description
The LM25119 is a dual synchronous buck controller intended
for step-down regulator applications from a high voltage or
widely varying input supply. The control method is based up-
on current mode control utilizing an emulated current ramp.
Current mode control provides inherent line feed-forward, cy-
cle-by-cycle current limiting and ease of loop compensation.
The use of an emulated control ramp reduces noise sensitivity
of the pulse-width modulation circuit, allowing reliable control
of very small duty cycles necessary in high input voltage ap-
plications. The switching frequency is programmable from
50kHz to 750kHz. The LM25119 drives external high-side and
low-side NMOS power switches with adaptive dead-time con-
trol. A user-selectable diode emulation mode enables discon-
tinuous mode operation for improved efficiency at light load
conditions. A high voltage bias regulator with automatic
switch-over to external bias further improves efficiency. Ad-
ditional features include thermal shutdown, frequency syn-
chronization, cycle-by-cycle and hiccup mode current limit
and adjustable line under-voltage lockout. The device is avail-
able in a power enhanced leadless LLP-32 package featuring
an exposed die attach pad to aid thermal dissipation.
Features
■ Emulated peak current mode control
■ Wide operating range from 4.5V to 42V
■ Easily configurable for dual outputs or interleaved single
output
■ Robust 3.3A peak gate drive
■ Switching frequency programmable to 750kHz
■ Optional diode emulation mode
■ Programmable output from 0.8V
■ Precision 1.5% voltage reference
■ Programmable current limit
■ Hiccup mode overload protection
■ Programmable soft-start
■ Programmable line under-voltage lockout
■ Automatic switch-over to external bias supply
■ Channel2 enable logic input
■ Thermal Shutdown
■ Leadless LLP32 (5mm x 5mm) package
Typical Application
30126201
2010 National Semiconductor Corporation
301262
www.national.com
LM25119
Wide
Input
Range
Dual
Synchronous
Buck
Controller
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM25119PSQX/NOPB | 功能描述:DC/DC 開關控制器 RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| LM25119QPSQ/NOPB | 制造商:Texas Instruments 功能描述: 制造商:Texas Instruments 功能描述:IC REG CTRLR BUCK PWM CM 32-LLP 制造商:Texas Instruments 功能描述:LM25119QPSQ/NOPB |
| LM25119QPSQX/NOPB | 制造商:Texas Instruments 功能描述:IC REG CTRLR BUCK PWM CM 32-LLP 制造商:Texas Instruments 功能描述:Dual Synchronous Buck Controller |
| LM2512 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Mobile Pixel Link Level 0, 24-Bit RGB Display Interface Serializer with Dithering and Look Up Table Option |
| LM-2512 | 制造商:ROHM 制造商全稱:Rohm 功能描述:16 x 32 matrix display |
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