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ADP3192A

更新时间： 2024-11-30 04:31:39
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亚德诺 - ADI 控制器
页数 文件大小 规格书
32页 1033K
描述
8-Bit Programmable 2- to 4-Phase Synchronous Buck Controller

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8-Bit Programmable 2- to 4-Phase  
Synchronous Buck Controller  
ADP3192A  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
VCC  
31  
RT RAMPADJ  
12 13  
Selectable 2-, 3-, or 4-phase operation at up to  
1 MHz per phase  
7.7 mV worst-case differential sensing error over  
temperature  
Logic-level PWM outputs for interface to external high  
power drivers  
Fast enhanced PWM (FEPWM) flex mode for excellent load  
transient performance  
Active current balancing between all output phases  
Built-in power-good/crowbar blanking supports on-the-fly  
VID code changes  
Digitally programmable 0.5 V to 1.6 V output supports both  
VR10.x and VR11 specifications  
SHUNT  
REGULATOR  
OSCILLATOR  
19  
OD  
UVLO  
SHUTDOWN  
SET EN  
RESET  
+
18  
1
GND  
EN  
30  
29  
28  
CMP  
PWM1  
PWM2  
PWM3  
–
–
+
850mV  
+
RESET  
CMP  
–
DAC  
+ 150mV  
+
–
+
RESET  
CMP  
–
2/3/4-PHASE  
CSREF  
DRIVER LOGIC  
RESET  
27 PWM4  
+
–
+
CMP  
–
DAC  
– 350mV  
CURRENT  
LIMIT  
DELAY  
2
PWRGD  
CROWBAR  
25  
24  
23  
22  
SW1  
SW2  
SW3  
Programmable short-circuit protection with programmable  
latch-off delay  
10  
9
TTSENSE  
VRHOT  
THERMAL  
THROTTLING  
CONTROL  
VRFAN  
8
SW4  
17  
15  
CSCOMP  
CSREF  
11  
7
ILIMIT  
CURRENT  
+
–
APPLICATIONS  
MEASUREMENT  
AND LIMIT  
DELAY  
16  
21  
CSSUM  
IMON  
Desktop PC power supplies for next generation  
Intel® processors  
VRM modules  
20  
5
IREF  
–
+
4
FB  
COMP  
+
PRECISION  
14  
LLSET  
REFERENCE  
–
BOOT  
VOLTAGE  
AND  
SOFT START  
CONTROL  
3
FBRTN  
VIDSEL  
6
SS  
VID DAC  
40  
ADP3192A  
32  
33  
34  
35  
36  
37  
38  
39  
VID7 VID6 VID5 VID4 VID3 VID2 VID1 VID0  
Figure 1.  
GENERAL DESCRIPTION  
The ADP3192A1 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 Intel processors. It uses an internal 8-bit DAC to read  
a voltage identification (VID) code directly from the processor,  
which is used to set the output voltage between 0.5 V and 1.6 V.  
The ADP3192A also includes programmable no load offset and  
slope functions to adjust the output voltage as a function of the  
load current, optimally positioning it for a system transient. In  
addition, the ADP3192A provides accurate and reliable short-  
circuit protection, adjustable current limiting, and a delayed  
power-good output that accommodates on-the-fly output  
voltage changes requested by the CPU.  
This device 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 for the construction of up to  
four complementary buck-switching stages.  
The ADP3192A has a built-in shunt regulator that allows the part  
to be connected to the 12 V system supply through a series resistor.  
The ADP3192A is specified over the extended commercial  
temperature range of 0°C to 85°C and is available in a  
40-lead LFCSP.  
1 Protected by U.S. Patent Number 6,683,441; other patents pending.  
Rev. 0  
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  
©2007 Analog Devices, Inc. All rights reserved.  
 
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