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ADP3186JRUZ-REEL

更新时间： 2024-11-30 03:46:15
品牌 Logo 应用领域
亚德诺 - ADI 稳压器开关式稳压器或控制器电源电路开关式控制器光电二极管
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24页 629K
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5-Bit Programmable 2-/3-/4-Phase Synchronous Buck Controller

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5-Bit Programmable 2-/3-/4-Phase  
Synchronous Buck Controller  
ADP3186  
FEATURES  
FUNCTIONAL BLOCK DIAGRAM  
VCC  
28  
RAMPADJ RT  
14 13  
Selectable 2-, 3-, or 4-phase operation at up to 1 MHz  
per phase  
ADP3186  
1ꢀ worst-case differential sensing error over temperature  
Logic-level PWM outputs for interface to external high  
power drivers  
Active current balancing between all output phases  
Built-in power good/crowbar blanking supports on-the-fly  
VID code changes  
UVLO  
SHUTDOWN  
AND BIAS  
11  
EN  
OSCILLATOR  
SET  
EN  
27  
26  
CMP  
RESET  
PWM1  
PWM2  
19  
6
GND  
CMP  
RESET  
CROWBAR  
CURRENT  
BALANCING  
CIRCUIT  
2-/3-/4-PHASE  
DRIVER LOGIC  
CSREF  
2.1V  
25  
24  
CMP  
RESET  
PWM3  
PWM4  
5-bit digitally programmable 0.8 V to 1.55 V output  
Programmable short-circuit protection with programmable  
latch-off delay  
CMP  
RESET  
DAC + 300mV  
CSREF  
CROWBAR  
CURRENT  
LIMIT  
DAC – 300mV  
APPLICATIONS  
23  
22  
21  
20  
SW1  
SW2  
SW3  
SW4  
Desktop PC power supplies for  
AMD Opteron™ processors  
VRM modules  
10  
DELAY  
PWRGD  
ILIMIT  
15  
EN  
17  
16  
18  
CSSUM  
CSREF  
CURRENT  
LIMIT  
CIRCUIT  
GENERAL DESCRIPTION  
The ADP3186 is a highly efficient multiphase synchronous  
buck switching regulator controller optimized for converting a  
12 V main supply into the core supply voltage required by high  
performance AMD processors. It uses an internal 5-bit DAC to  
read a voltage identification (VID) code directly from the pro-  
cessor, which is used to set the output voltage between 0.8 V  
and 1.55 V. It uses a multimode PWM architecture to drive the  
logic-level outputs at a programmable switching frequency that  
can be optimized for VR size and efficiency. The phase relation-  
ship of the output signals can be programmed to provide 2-, 3-,  
or 4-phase operation, allowing the construction of up to four  
complementary buck switching stages.  
12  
DELAY  
COMP  
CSCOMP  
SOFT  
START  
8
FB  
9
PRECISION  
REFERENCE  
VID  
DAC  
7
1
2
3
4
5
FBRTN  
VID4  
VID3  
VID2  
VID1  
VID0  
Figure 1.  
The ADP3186 includes programmable no-load offset and slope  
functions to adjust the output voltage as a function of the load  
current, so that it is always optimally positioned for a system  
transient. The ADP3186 also provides accurate and reliable  
short-circuit protection, adjustable current limiting, and a power  
good output that accommodates on-the-fly output voltage  
changes requested by the CPU.  
The ADP3186 is specified over the commercial temperature  
range of 0°C to 85°C and is available in 28-lead TSSOP and  
QSOP packages.  
Rev. A  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rights of third parties that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.  
Tel: 781.329.4700  
Fax: 781.461.3113  
www.analog.com  
©2006 Analog Devices, Inc. All rights reserved.  
 
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ADP3189JCPZ-RL ONSEMI

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 		8-Bit Programmable 2- to 5-Phase Synchronous Buck Controller

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