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LM27213MTDX PDF预览

LM27213MTDX

更新时间: 2024-10-27 04:44:35
品牌 Logo 应用领域
美国国家半导体 - NSC 控制器
页数 文件大小 规格书
22页 959K
描述
Single Phase Hysteretic Buck Controller

LM27213MTDX 数据手册

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February 2006  
LM27213  
Single Phase Hysteretic Buck Controller  
General Description  
Features  
n Ideal load and line transient responses  
n 5V to 30V input range  
The LM27213 is a single-phase synchronous buck regulator  
controller designed to fully support a portable microproces-  
sor. On-chip gate drive makes for a compact, single chip  
solution. Output currents in excess of 25 Amps are possible.  
n On-chip gate drive  
n Convenient CLK_EN# signal  
n Input under-voltage lockout  
n High light-load efficiency  
n Adjustable analog soft start  
n Peak current limit  
The IC employs a current mode hysteretic control mecha-  
nism. Inductor current is sensed through a low value sense  
resistor.  
The LM27213 will operate over an input voltage range of 5V  
to 30V. The output voltage is programmed through 6 Voltage  
Identification (VID) pins and ranges from 0.700V to 1.708V in  
64 steps.  
n Over-voltage protection  
n Error correction for good static accuracy  
n
1% DAC accurcy over temperature  
Since the error in the output voltage directly sets the inductor  
current, the dynamic response to a large, fast load transient  
is close to a square wave. This is optimal for mode transition  
requirements. Also, due to the intrinsic input voltage feedfor-  
ward characteristic of hysteretic control, the line transient  
response is excellent as well.  
n Interfaces with the LM2647 system supply  
n Available in TSSOP or tiny LLP package  
Applications  
n Core voltage supply for Low Power Processors  
n Low voltage high current buck regulators  
The IC provides cycle-by-cycle peak current limit, over-  
voltage protection, and a power good signal. The LM27213  
fully supports the Stop CPU and Sleep modes offered by  
some processors. When enabled, the IC enters a power-  
saving “diode emulator” mode which helps prolong battery  
runtime for portable systems.  
Benefits  
n Single chip core power solution  
n Minimum output capacitance required  
n Low cost, compact design  
The LM27213 also has a soft start feature for the external  
adjustment of soft start speed.  
Typical Application  
20154330  
© 2006 National Semiconductor Corporation  
DS201543  
www.national.com  

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