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参数资料
| 型号： | LM2636MX/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封装： | PLASTIC, SOP-20 |
| 文件页数： | 8/17页 |
| 文件大小： | 372K |
| 代理商： | LM2636MX/NOPB |
National P/N LM2636 - 5-Bit Programmable Synchronous Buck Regulator Controller
LM2636MTC
20 MSL
Full
production
N/A
1K+
$1.6000
rail
of
73
[logo]UZ2T
LM2636
MTC
LM2636MTCX
20 MSL
Full
production
N/A
1K+
$1.6000
reel
of
2500
[logo]UZ2T
LM2636
MTC
LM2636 MDC
Full
production
N/A
N/A Samples
tray
of
N/A
-
LM2636 MWC
Full
production
N/A
wafer
jar
of
N/A
-
General Description
The LM2636 is a high speed controller designed specifically for use in synchronous DC/DC buck converters
for advance d microprocessors. A 5-bit DAC accepts the VID code directly from the CPU and adjusts the
output voltage from 1.3V to 3.5V. It provides the power good, over-voltage protection, and output enable
features as required by Intel VRM specifications. Current limiting is achieved by monitoring the voltage drop
across the rDS_ON of the high side MOSFET, which eliminates an expensive current sense resistor.
The LM2636 employs a fixed-frequency voltage mode PWM architecture. To provide a faster response to a
large and fast load transient, two ultra-fast comparators are built in to monitor the output voltage and
override the primary control loop when necessary. The PWM frequency is adjustable from 50 kHz to 1 MHz
through an external resistor. The wide range of PWM frequency gives the power supply designer the
flexibility to make trade-offs between load transient response performance, MOSFET cost and the overall
efficiency. The adaptive non-overlapping MOSFET gate drivers help avoid any potential shoot-through
problem while maintaining high efficiency. BiCMOS gate drivers with rail-to-rail swing ensure that no
spurious turn-on occur. When only 5V is available, a bootstrap structure can be employed to accommodate
an NMOS high side switch. The precision reference trimmed to 2.5% over temperature is available externally
for use by other regulators. Dynamic positioning of load voltage, which helps cut the number of output
capacitors, can also be implemented easily.
Features
q
1.3V to 3.5V 5-bit programmable output voltage
q
Synchronous rectification
q
Power Good flag and output enable
q
Over-voltage protection
q
Initial Output Accuracy: 1.5% over temperature
q
Current limit without external sense resistor
q
Adaptive non-overlapping MOSFET gate drives
q
Adjustable switching frequency: 50 kHz to 1 MHz
q
Dynamic output voltage positioning
q
1.256V reference voltage available externally
q
Plastic SO-20 package and TSSOP-20 package
Applications
q
Motherboard power supply/VRM for Cyrix Gxm, Cyrix Gxi, Cyrix MII, Pentium II, Pentium Pro, 6x86
and K6 processors
q
5V to 1.3V-3.5V high current power supplies
file:///H|/imaging/BITTING/cpl/20020808_1/08062002_10/NATL/08062002_HTML/LM2636.html (2 of 3) [Aug-09-2002 2:37:51 PM]
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相关代理商/技术参数 |
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| LM2637 | 制造商:未知厂家 制造商全称:未知厂家 功能描述: |
| LM2637A E WAF | 制造商:Texas Instruments 功能描述: |
| LM2637M | 制造商:OC White Company 功能描述:LDO Cntrlr REG CTRLR 1.3V to 3.5V 24-Pin SOIC W Rail |
| LM2637M/NOPB | 功能描述:IC MOTHERBRD PWR SUPPLY 24-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
| LM2637MX/NOPB | 功能描述:IC MOTHERBRD PWR SUPPLY 24-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 电源管理 - 专用 系列:- 应用说明:Ultrasound Imaging Systems Application Note 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:37 系列:- 应用:医疗用超声波成像，声纳 电流 - 电源:- 电源电压:2.37 V ~ 6 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:56-WFQFN 裸露焊盘 供应商设备封装:56-TQFN-EP（8x8） 包装:管件 |
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