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LM2636
5-Bit Programmable Synchronous Buck Regulator
Controller
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 di-
rectly 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 speci-
fications. Current limiting is achieved by monitoring the volt-
age drop across the r
DS_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 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
2.5% 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
n
1.3V 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: 1.5% 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 and TSSOP-20 package
Applications
n
Motherboard power supply/VRM for Cyrix Gxm, Cyrix
Gxi, Cyrix MII, Pentium II, Pentium Pro, 6x86 and K6
processors
n
5V to 1.3V–3.5V high current power supplies
Connection Diagrams
TOP VIEW
10083403
Plastic SO-20
Order Number LM2636M
See NS Package Number M20B
10083403
Plastic TSSOP-20
Order Number LM2636MTC
See NS Package Number MTC20
Pentium is a trademark of Intel Corporation.
March 2005
LM2636
5-Bit
Programmable
Synchronous
Buck
Regulator
Controller
2005 National Semiconductor Corporation
DS100834
www.national.com
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相关代理商/技术参数
LM2636MTC 制造商:OC White Company 功能描述:DC DC Cntrlr Single-OUT Sync Buck 4.5V to 5.5V Input 20-Pin TSSOP Rail
LM2636MTC/NOPB 功能描述:IC REG SYNCH BUCK 5-BIT 20-TSSOP 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
LM2636MTCX 制造商:未知厂家 制造商全称:未知厂家 功能描述:Voltage-Mode SMPS Controller
LM2636MTCX/NOPB 功能描述:IC CTRLR PROG REG 5BIT 20TSSOP 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
LM2636MX 制造商:Texas Instruments 功能描述:
LM2636MX/NOPB 功能描述:IC CTRLR PROG REG 5BIT 20-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
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: