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參數資料
| 型號： | LM5642MTC |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | High Voltage, Dual Synchronous Buck Converter with Oscillator Synchronization |
| 中文描述： | DUAL SWITCHING CONTROLLER, 226 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | TSSOP-28 |
| 文件頁數： | 1/24頁 |
| 文件大小： | 667K |
| 代理商： | LM5642MTC |
LM5642
High Voltage, Dual Synchronous Buck Converter with
Oscillator Synchronization
General Description
The LM5642 consists of two current mode synchronous
buck regulator controllers operating 180 out of phase with
each other at a normal switching frequency of 200kHz.
Out of phase operation reduces the input ripple RMS cur-
rent, thereby significantly reducing the required input capaci-
tance. The switching frequency can be synchronized to an
external clock between 150kHz and 250kHz. The two switch-
ing regulator outputs can also be paralleled to operate as a
dual-phase single output regulator.
The output of each channel can be independently adjusted
from 1.3 to 90% of Vin. An internal 5V rail is also available
externally for driving bootstrap circuitry.
Current-mode feedback control assures excellent line and
load regulation and a wide loop bandwidth for excellent
response to fast load transients. Current is sensed across
either the Vds of the top FET or across an external current-
sense resistor connected in series with the drain of the top
FET.
The LM5642 features analog soft-start circuitry that is inde-
pendent of the output load and output capacitance making
the soft-start behavior more predictable and controllable
than traditional soft-start circuits.
Over-voltage protection is available for both outputs. A UV-
Delay pin is also available to allow delayed shut off time for
the IC during an output under-voltage event.
Features
n
Two synchronous buck regulators
n
180 out of phase operation
n
Synchronizable switching frequency from 150kHz to
250kHz
n
4.5V to 36V input range
n
50μA Shutdown current
n
Adjustable output from 1.3V to 90% of Vin
n
0.04% (typical) line and load regulation error
n
Current mode control with or without a sense resistor
n
Independent enable/soft-start pins allow simple
sequential startup configuration.
n
Configurable for single output parallel operation. (See
Figure 2
)
n
Adjustable cycle-by-cycle current limit
n
Input under-voltage lockout
n
Output over-voltage latch protection
n
Output under-voltage protection with delay
n
Thermal shutdown
n
Self discharge of output capacitors when the regulator is
OFF
n
TSSOP package
Applications
n
Embedded Computer Systems
n
Telecom Systems
n
Set-Top Boxes
n
WebPAD
n
Point Of Load Power Architectures
Typical Application Circuit
20060101
September 2003
L
2003 National Semiconductor Corporation
DS200601
www.national.com
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM5642MTC/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 |
| LM5642MTCX | 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 |
| LM5642MTCX/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 |
| LM5642XMH | 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 |
| LM5642XMH/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 |
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