參數(shù)資料
型號(hào)： SMM205
廠商： Electronic Theatre Controls, Inc.
英文描述： Dual Channel Supply Voltage Marginer and Active DC Output Controller
中文描述： 雙通道電源電壓Marginer和有源直流輸出控制器
文件頁(yè)數(shù)： 1/20頁(yè)
文件大?。?/td> 901K
代理商： SMM205
SMM205
Dual Channel Supply Voltage Marginer and Active DC Output Controller
Preliminary Information
1
(See Last Page)
SUMMIT
Microelectronics, Inc. 2003
1717 Fox Drive San Jose CA 95131 Phone 408 436-9890 FAX 408 436-9897
www.summitmicro.com
2069 1.4 6/23/03
1
FEATURES & APPLICATIONS
Extremely accurate (±0.1%) Active
DC Output Control (ADOC)
ADOC Automatically adjusts supply output
voltage level under all load conditions
Capable of margining supplies with trim inputs
using either positive or negative trim pin control
Wide Margin/ADOC range from 0.3V to VDD
Uses either an internal or external VREF
Operates from any intermediate bus supply
from 8V to 15V and from 2.7V to 5.5V
Programmable START and READY pins
Two programmable general purpose monitor
sensors – UV and OV with FAULT Output Flag
General Purpose 1k EEPROM with Write Protect
I
2
C 2-wire serial bus for programming
configuration and monitoring status.
28 lead QFN package
Applications
In-system test and control of Point-of-Load
(POL) Power Supplies for Multi-voltage
Processors, DSPs and ASICs
Enterprise and edge routers, servers, Storage
Area Networks
SIMPLIFIED APPLICATIONS DRAWING
6V to 15V
2.7V to 5.5V
Intermediate
Bus Voltage
(IBA
INTRODUCTION
The SMM205 actively controls the output voltage level
of two DC/DC converters that use a Trim or VADJ/FB
pin to adjust the output. An Active DC Output Control
(ADOC) feature is used during normal operation to
maintain extremely accurate settings of supply
voltages and, during system test, to control margining
of the supplies using I
C commands. Total accuracy
with a ±0.1% external reference is ±0.2%, and ±0.5%
using the internal reference. The device can margin
supplies with either positive or negative trim pin control
within a range of 0.3V to VDD. The SMM105 supply
can be from 12V, 8V, 5V or 3.3V to as low as 2.7V to
accommodate any intermediate bus supply.
The voltage settings (margin high/low and nominal)
are programmed into nonvolatile memory through the
industry standard I
C 2-wire data bus. The I
C bus is
also used to enable margin high, margin low, ADOC or
normal operation. When margining, the SMM205
checks the voltage output of the converter and make
adjustments to the trim pin via a feedback loop to bring
the voltage to the margin setting. A margining status
register is set to indicate that the system is ready for
test. The SMM205 ADOC continues to monitor and
adjust the channel output at the specified level.
START
WP#
VREF_CNTL
TRIM_CAPA
TRIM_CAPB
COMP1
TRIMA
VMA
COMP2
READY
F
TRIMB
VMB
V
VDD_CAP
1
G
FILT_CAP
SMM205
I
2
C
BUS
A0
A1
A2
SCL
SDA
DC/DC
Trim
On/Off
V–
V+
Vin
DC/DC
Trim
On/Off
V–
V+
Vin
UV
OV
Processor
V1
V2
GND
External or
Internal
VREF
Figure 1 – Applications Schematic showing the SMM205 ADOC actively control the DC output level of 2
DC/DC Converters as well as provide margin control. The SMM205 can operate over a wide supply range
Note: This is an applications example only. Some pins, components and values are not shown.
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