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參數資料
| 型號： | LM20242 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | 36V, 2A PowerWise㈢ Adjustable Frequency Synchronous Buck Regulator |
| 中文描述： | 至36V，2A條的PowerWise㈢可調頻率同步降壓穩(wěn)壓器 |
| 文件頁數： | 1/20頁 |
| 文件大小： | 384K |
| 代理商： | LM20242 |
November 1, 2007
LM20242
36V, 2A PowerWise
Adjustable Frequency Synchronous
Buck Regulator
General Description
The LM20242 is a full featured 1MHz capable synchronous
buck regulator capable of delivering up to 2A of load current.
The current mode control loop is externally compensated with
only two external components, offering both high perfor-
mance and ease of use. The device is optimized to work over
the input voltage range of 4.5V to 36V making it well suited
for high voltage systems.
The device features internal Over Voltage Protection (OVP)
and Over Current Protection (OCP) circuits for increased sys-
tem reliability. A precision Enable pin and integrated UVLO
allows the turn on of the device to be tightly controlled and
sequenced. Startup inrush currents are limited by both an in-
ternally fixed and externally adjustable soft-start circuit. Fault
detection and supply sequencing are possible with the inte-
grated PGOOD circuit.
The LM20242 is designed to work well in multi-rail power
supply architectures. The output voltage of the device can be
configured to track a higher voltage rail using the SS/TRK pin.
If the output of the LM20242 is pre-biased at startup it will not
sink current to pull the output low until the internal soft-start
ramp exceeds the voltage at the feedback pin.
The LM20242 is offered in an exposed pad 20 pin TSSOP
package that can be soldered to the PCB, eliminating the
need for bulky heatsinks.
Features
■
2A Output Current, 3.7A peak current
■
130 m
/110 m
integrated power MOSFETs
■
1.5% output voltage accuracy
■
Current Mode Control, selectable compensation
■
Resistor programmed, 1MHz capable oscillator
■
Synchronous rectifier with diode emulation
■
Adjustable output voltage down to 0.8V
■
Compatible with pre-biased loads
■
Programmable soft-start with external capacitor
■
Precision enable pin with hysteresis
■
OVP, UVLO inputs and PGOOD output
■
Internally protected with peak current limit, thermal
shutdown and restart
■
Accurate current limit with frequency foldback
■
Non-linear current mode slope compensation
■
eTSSOP-20 exposed pad package
Applications
■
Simple to design, high efficiency point of load regulation
from a 4.5V to 36V bus
■
High Performance DSPs, FPGAs, ASICs and
Microprocessors
■
Communications Infrastructure, Automotive
Simplified Application Circuit
30031401
PowerWise
is a registered trademark of National Semiconductor Corporation.
2007 National Semiconductor Corporation
300314
www.national.com
L
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| LM20242MHE | 36V, 2A PowerWise㈢ Adjustable Frequency Synchronous Buck Regulator |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM20242_08 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:36V, 2A PowerWise㈢ Adjustable Frequency Synchronous Buck Regulator |
| LM20242EVAL | 功能描述:BOARD EVAL 2A POWERWISE LM20242 RoHS:否 類別:編程器，開發(fā)系統(tǒng) >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:PowerWise® 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩(wěn)壓器拓撲結構:升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM20242EVAL/NOPB | 功能描述:電源管理IC開發(fā)工具 LM20242 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| LM20242MH | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 4.5V to 36V 20-Pin TSSOP EP Rail 制造商:Texas Instruments 功能描述:SWITCH REG, 36V, 2A, TSSOP20, POWERWISE 制造商:Texas Instruments 功能描述:SWITCH REG, 36V, 2A, TSSOP20, POWERWISE; Primary Input Voltage:36V; No. of Outputs:1; Output Voltage:32V; Output Current:2A; Voltage Regulator Case Style:TSSOP; No. of Pins:20; Operating Temperature Min:-40C; Operating Temperature ;RoHS Compliant: Yes |
| LM20242MH/NOPB | 功能描述:直流/直流開關轉換器 RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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