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參數(shù)資料
| 型號(hào)： | ADP3198JCPZ-RL |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 8-Bit Programmable 2- to 4-Phase Synchronous Buck Controller |
| 中文描述： | SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, QCC40 |
| 封裝： | 6 X 6 MM, LEAD FREE, MO-220VJJD-2, LFCSP-40 |
| 文件頁數(shù)： | 1/32頁 |
| 文件大?。?/td> | 728K |
| 代理商： | ADP3198JCPZ-RL |
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8-Bit Programmable 2- to 4-Phase
Synchronous Buck Controller
ADP3198
FEATURES
Selectable 2-, 3-, or 4-phase operation at up to
1 MHz per phase
±11 mV worst-case differential sensing error over
temperature
Logic-level PWM outputs for interface to external high
power drivers
Enhanced PWM 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
Programmable short-circuit protection with programmable
latch-off delay
APPLICATIONS
Desktop PC power supplies for next generation
Intel processors
VRM modules
GENERAL DESCRIPTION
The ADP3198
1
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 per-
formance 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.
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 ADP3198 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. The
ADP3198 also 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.
1
Protected by U.S. Patent Number 6,683,441; other patents pending.
FUNCTIONAL BLOCK DIAGRAM
RESHUNT
VID DAC
+ 15DAC
850mV
– 50DAC
CSREF
2/3/4-PHASE
RESET
EN
SET
RESET
18
1
2
10
9
8
11
7
20
5
3
40
–
+
–
+
–
+
SHUVLO
19
30
29
28
27
25
24
23
22
17
15
16
21
4
14
6
VAND
SCONTROL
TCONTROL
DELAY
RESET
RESET
VID7
32
VID6
33
VID5
34
VID4
35
VID3
36
VID2
Figure 1.
37
VID1
38
VID0
39
ADP3198
–
CMP
–
CMP
–
CMP
–
CMP
CROWBAR
CURRENT
MAND LIMIT
PRECISION
31
12
13
+
–
+
–
+
–
GND
EN
DELAY
ILIMIT
PWRGD
COMP
FBRTN
VIDSEL
IREF
TTSENSE
VRHOT
VRFAN
PWM2
PWM3
PWM4
SW3
SW2
SW1
CSREF
CSCOMP
SW4
CSSUM
FB
PWM1
SS
LLSET
IMON
OD
VCC
RAMPADJ
RT
C
C
OSCILLATOR
0
The ADP3198 has a built-in shunt regulator that allows the part
to be connected to the 12 V system supply through a series resistor.
The ADP3198 is specified over the extended commercial
temperature range of 0°C to 85°C and is available in a
40-lead LFCSP.
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 registered trademarks are the 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
2006 Analog Devices, Inc. All rights reserved.
www.analog.com
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