SMM605
Preliminary Information
1
(See Last Page)
Six-Channel Supply Voltage Marginer and Active DC Output Controller (ADOC
TM
)
INTRODUCTION
FEATURES & APPLICATION
•
Extremely accurate (0.2%, typ.) Active DC Output
Control
•
Six-channel control of DC/DC converters
•
ADOC Automatically adjusts supply output
voltage level under all DC load conditions
•
Capable of margining supplies with trim inputs
using either positive or negative trim pin control
•
Wide Margin/ADOC range from 0.35V to VDD
•
Uses either an internal or external VREF
•
Operates from any intermediate bus supply
from 6V to 14V and VDD from 2.7V to 5.5V
•
Programmable START and READY pins
•
General Purpose 4k EEPROM with Write Protect
•
I
2
C 2-wire serial bus for programming
configuration and monitoring status.
•
48-lead TQFP package
Applications
•
Monitor/Control Distributed and POL Supplies
•
Multi-voltage Processors, DSPs, ASICs used in
Telecom, CompactPCI or server systems
The SMM605 actively controls the output voltage level
of up to six DC/DC converters that use a ‘Trim’ or
‘VADJ/FB’ pin to adjust the output. An Active DC
Output Control (ADOC
TM
) 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 the industry standard
I
2
C 2-wire data bus 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 0.35V to VDD. The SMM605 supply can range
from 2.7V to 5.5V or 6V to 14V to accommodate any
intermediate bus supply.
The voltage settings (margin high/low and nominal) are
programmed into nonvolatile memory. The I
2
C bus is
used to enable margin high, margin low, ADOC or
normal operation. When margining, the SMM605 will
check 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.
SIMPLIFIED APPLICATIONS DRAWING
12VIN (+6V to +14V Range)
3.3VIN (+2.7V to +5.5V Range)
12VIN
VDD
DC/DC
Converter C, E
TRIM_CAP
A
VIN
DC/DC
Converter A
Vout
TRIM
12V
3.3V
SDA
I
2
C
BUS
SCL
A2
2.5VIN
TRIM
A
VDD_CAP
2 of 6 DC-DC
Converters shown
SMM605
VM
A
DC/DC
Converter D, F
VIN
DC/DC
Converter B
Vout
TRIM
TRIM_CAP
B
μP/
ASIC
1.2VIN
External or
Internal
REFERENCE
VREF_CNTL
TRIM
B
START
READY
VM
B
POWER GOOD
READY
Figure 1 – Applications Schematic using the SMM605 Controller to actively control and margin the output
levels of up to six DC/DC Converters.
Note: This is an applications example only. Some pins, components and values are not shown.
© SUMMIT
Microelectronics, Inc. 2003
• 757 N. Mary Avenue • Sunnyvale CA 94085 •
Phone 408 523-1000 • FAX 408 523-1266
http://www.summitmicro.com
2064 2.1 12/16/2011
1
SMM605
Preliminary Information
Figure 2 – Example Power Supply Margining using the SMM605. The waveform on the left is margin low to
high from 1.6V to 2.0V and the waveform on the right is margin high to nominal from 2.0V to 1.8V. The ADOC
function guarantees the output level to be within ±0.2% maximum with a ±0.1% external reference. The
bottom waveform is the READY signal indicating margin is complete.
GENERAL DESCRIPTION
The SMM605 is capable of controlling the DC output of
up to six DC/DC Modules, switching regulators or LDOs
that use a trim/adjust pin and automatically change the
level using a unique Active DC Output Control
(ADOC
TM
). The ADOC function is programmable over a
standard 2-wire I
2
C serial data interface and can be
used to set the nominal DC output voltage as well as
the margin high and low settings. The part actively
controls the programmed set levels to maintain tight
control over load variations and voltage drops at the
point of load. The margin range will vary depending on
the supply manufacturer and model but the normal
range is 10% adjustment around the nominal output
setting. However, the SMM605 has the capability to
margin from 0.35V to VDD. The user can set the
desired voltage settings (nominal, margin high and
margin low) into the EE memory array for the device.
Then, volatile registers are used to select one of these
settings. These registers are accessed over the I
2
C
bus.
In normal operation, Active DC Output Control is set to
adjust the nominal output voltage of the converter.
Typical converter accuracy ratings range from
±2%
to
±5%
of their output voltage. Using the Active DC
Output Control feature of the SMM605 can increase the
accuracy to
±0.1%
(±0.2% Max.). This high accuracy
control of the converter output voltage is extremely
important in low voltage applications where deviations
in power supply voltage can result in lower system
performance. Active DC Output Control can also be
used for margining a supply during system test or may
be turned off by de-selecting the function in the Control
Register.
The margin high and margin low voltage settings can
range from 0.35V to VDD around the converters’
nominal output voltage setting depending on the
specified margin range of the DC-DC converter. When
the SMM605 receives the command to margin, the
Active DC Output Control will adjust the supply to the
selected margin voltage. Once the supply has reached
its margined set point, the Ready bit in the status
register will set and the READY pin will go active. If
Active DC Control is disabled, a margined supply can
return to its nominal voltage by writing to the margin
command register.
In order to obtain maximum accuracy, the SMM605
requires an external voltage reference. An external
reference with ±0.1% accuracy will enable an overall
±0.2% accuracy for the device. A configuration option
also exists so that an internal voltage reference can be
used, but with less accuracy. Total accuracy using the
internal reference is ±0.5%.
The SMM605 has additional filter pins to filter unwanted
switching regulator noise. They are VDD_CAP and
FILT_CAP.
The SMM605 can be powered from either the 12VIN
supply pin (6V to 14V range) via an internal regulator or
the VDD supply pin (+2.7 to 5.5V range), see Figure 3.
Programming of the SMM605 is performed over the
industry standard I
2
C 2-wire serial data interface. A
status register is available to read the state of the part
and a Write Protect bit is available to prevent writing to
the configuration registers and EE memory.
Summit Microelectronics, Inc
2064 2.1 12/16/2011
2
SMM605
Preliminary Information
INTERNAL FUNCTIONAL BLOCK DIAGRAM
12VIN
VDD
VDD_CAP
VREF_CNTL
Level
Shift
Vout
3.6V or
5.5V
Regulator
V+
V-
Power
Supply
Arbitrator
Trim Drive
Trim Drive
Trim Drive
TRIMA
TRIM_CAPA
Output
Control
1:6 MUX
Trim Drive
Trim Drive
Trim Drive
TRIMF
TRIM_CAPF
START
READY
A2
SDA
SCL
CONTROL
LOGIC
Input Voltage
Sensing and
Signal
Conditioning
6:1 MUX
VMA
EE
Memory
FILT_CAP
VMF
Figure 3 –SMM605 Internal Functional Block Diagram.
Summit Microelectronics, Inc
2064 2.1 12/16/2011
3
SMM605
Preliminary Information
PIN DESCRIPTIONS
Pin
Number
1
41
36
31
26
21
16
44
39
34
29
24
19
45
40
35
30
25
20
48
47
46
5, 6, 12,
13
IN
PWR
PWR
GND
I/O
OUT
Pin
Type
Pin Name
VM
A
VM
B
VM
C
IN
VM
D
VM
E
VM
F
TRIM
A
TRIM
B
TRIM
C
TRIM
D
TRIM
E
TRIM
F
TRIM_CAP
A
TRIM_CAP
B
TRIM_CAP
C
TRIM_CAP
D
TRIM_CAP
E
TRIM_CAP
F
VDD_CAP
12VIN
VDD
GND
External capacitor input used to filter the internal supply rail.
12V power supply input internally regulated to 3.6 or 5.5V. Input range is
6V to 14V using the 3.6V internal regulator setting and 10V to 14V using
the 5.5V internal regulator setting.
2.7V to 5.5V Power supply of the part.
Ground of the part.
External sample and hold capacitor input used to set the voltage on the
TRIM pins.
Output voltage used to margin and/or trim converter voltages. Connect to
the converter Trim input or to the VADJ or FB pin of an adjustable output
switching regulator or LDO through a resistor. If the ADOC/margining
functionality is not used on a channel, the associated TRIMx pin should be
floating.
Voltage monitor pin. Connect to the DC-DC converter + sense line or +
Vout pin.
Pin Description
Summit Microelectronics, Inc
2064 2.1 12/16/2011
4
SMM605
Preliminary Information
PIN DESCRIPTIONS (Cont.)
Pin
Number
15
14
1
2
3
Pin
Type
IN
IN
I/O
IN
IN
Pin Name
FILT_CAP
VREF_CNTL
SDA
SCL
A2
Pin Description
External capacitor input used to filter VM
X
inputs. This provides an RC filter
where R = 1kΩ.
Voltage reference input used for DC output control and margining.
Bi-directional I
2
C data line.
I
2
C clock line.
The address pin is biased either to VDD_CAP or GND.
When
communicating with the SMM605 over the 2-wire bus A2 provides a
mechanism for assigning a unique bus address.
Programmable active high/low input. The START input is used solely for
enabling Active Control and/or margining.
Programmable active high/low open drain output signals indicating when all
programmed power supplies have reached their preprogrammed setpoints.
Leave the NC pins floating.
4
7
IN
OUT
NC
START
READY
No Connect
PACKAGE AND PIN CONFIGURATION
48 LEAD TQFP
VDD_CAP
WLDI
SDA
SCL
48
47
46
45
44
43
42
41
40
39
38
LDO#
WDO#
CROWBAR
1.25VREF
MR#
IRQ_CLR#
IRQ#
PGND
TRKR_IRQ#
SEATED1#
SEATED2#
UV_OVRRIDE
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
37
36
35
34
33
32
31
30
29
28
27
26
25
CB1
VI1
VI2
VI3
A1
A0
VI4
A2
CB2
CB3
CB4
PWR_ON
VGATE1
VGATE2
VGATE3
VGATE4
VGG_CAP
FORCE_SD
HEALTHY#
CBFAULT
VO1
Summit Microelectronics, Inc
2064 2.1 12/16/2011
ENABLE
RST3#
VO2
V03
RST1#
DGND
RST2#
RST4#
AGND
PGND
VO4
5
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