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參數(shù)資料
| 型號(hào)： | LM2635MX/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | PLASTIC, SO-20 |
| 文件頁(yè)數(shù)： | 1/13頁(yè) |
| 文件大?。?/td> | 290K |
| 代理商： | LM2635MX/NOPB |
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LM2635
5-Bit Programmable Synchronous Buck Regulator
Controller
General Description
The LM2635 is a high speed controller designed specifically
for use in synchronous DC/DC buck converters for the
Pentium II or Deschutes microprocessor. A 5-bit DAC ac-
cepts the VID code directly from the CPU and adjusts the
output voltage from 1.8V to 3.5V. It provides the power good,
over-voltage protection, and output enable features as re-
quired by Intel VRM specifications. Current limiting is
achieved by monitoring the voltage drop across the r
DS_ON
of the high side MOSFET, which eliminates an expensive
current sense resistor.
The LM2635 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 moni-
tor 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 flexibil-
ity to make trade-offs between load transient response per-
formance, 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% 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 imple-
mented easily.
Features
n 1.8V to 3.5V 5-bit programmable output voltage
n Synchronous rectification
n Power Good flag and output enable
n Over-voltage protection
n Initial Output Accuracy: 2% over temperature
n Current limit without external sense resistor
n Adaptive non-overlapping MOSFET gate drives
n Adjustable switching frequency: 50 kHz to 1 MHz
n Dynamic output voltage positioning
n 1.256V reference voltage available externally
n Plastic SO-20 package
Applications
n Motherboard power supply/VRM for Cyrix Gxm, Cyrix
Gxi, Cyrix MII, Pentium II, Deschutes, Pentium Pro,
6x86 and K6 processors
n 5V to 1.8V–3.5V high current power supplies
Pentium is a trademark of Intel Corporation.
June 1999
LM2635
5-Bit
Programmable
Synchronous
Buck
Regulator
Controller
1999 National Semiconductor Corporation
DS100119
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LM2636 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:5-Bit Programmable Synchronous Buck Regulator Controller |
| LM2636A E WAF | 制造商:Texas Instruments 功能描述: |
| LM2636AM E WAF | 制造商:Texas Instruments 功能描述: |
| LM2636M | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LM2636M/NOPB | 功能描述:IC REG SYNCH BUCK 5-BIT 20-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 電源管理 - 專用 系列:- 應(yīng)用說(shuō)明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
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