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Summit Microelectronics

SMH4046 Datasheet Preview

SMH4046 Datasheet

Active DC Output Control (ADOCTM) Power Manager

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SMH4046
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Preliminary Information 1 (See Last Page)
Hot-Swap, Active DC Output Control (ADOCTM) Power Manager with I2C lnterface
FEATURES & APPLICATIONS
Full voltage Control for hot-swap applications
- Add-in Card insertion detection
- Platform voltage detection
Universal FPGA configuration I/O pins
High Voltage and logic level enable outputs
Active control (ADOCTM) for three downstream
DC/DC converters with ±0.5% accuracy
Margining of three DC/DC converters
Power-up sequencing of all supply voltages
Power-down sequencing in Forward or Reverse
UV and OV sensors per channel with
programmable reset and interrupt
Programmable glitch filter for all channels
Configuration may be locked
Auto monitoring of all channels and Ext Temp
I2CTM serial bus interface
Programmable slew rate control
Integrated 2K EEPROM
Applications
Monitor/Control Distributed and POL Supplies
Multi-voltage Processors, DSPs, ASICs used in
Telecom or server systems
TYPICAL APPLICATIONS DRAWING
BD_SEL1#
FPGA
INTRODUCTION
The SMH4046 is an all-inclusive power management
controller that integrates hot swap protection of three
positive-voltage supplies (+12V or less). In addition to
hot swapping three bus voltages, it provides
sequencing and Active DC Output Control (ADOCTM)
of three on-card DC-DC converters as used in blade
servers and Telecom systems. It can also upload
configuration code from the host to on-card FPGAs.
All six channels can cascade-sequence during power-
up in any order as set by either hardware or firmware;
and sequence down in forward or reverse order.
ADOCTM control of the three DC/DC converters
maintains their accuracy to within ±0.5% of the set
point using an internal voltage reference. ADOCTM is
also included during “margining” to allow card-by-card
performance evaluation during production with
arbitrary setting within ±10% in any combination.
A full set of monitoring and control features are
included, with user programmability that can be
locked. The SMH4046 uses the I2C bus interface for
programming and FPGA configuration.
Ejector
Switch
+3.3V
+5V
+12V
GND
TEMP
GND
GND
+5V
GND
PCI_RST#
BD_SEL#
HEALTHY#
Pre-
Charge
Circuit
5
GND
HST_PWR
VMA
TPRUIMPAA
VCC5
VMB
TRIMB
PUPB
VMC
TRIMC
PUPC
VGATE5
HST_RST#
CARD_5V
PND2# SMH4046 VCC3
VGATE3
VGG_CAP
HEALTHY#
CARD_V_VLD
CARD_3V
VCC12
EXT_TMP
1Vref
SCL A2 SDA
DRVREN#
CARD_12V
G
47nF
D
S
1uF
47nF
270k
10
G
DC/DC #1
TRIM
OVIEN
VOUT
DC/DC #2
TRIM
OE
VIN
VOUT
TRIM
OE
DC/DC #3
VOUT
VIN
G
47nF
S
D
S
FS
Vout1
Vout2
Vout3
•Hot swap
•ADOCTM
•Pwr On/Off
Board 5V •Cascade
•Sequence
•Monitor
Board 3.3V •Margin
•I2C
D Board 12V
PCI Interface ASIC
IRQ
FAULT
CARD RESET
Figure 1 – Applications Schematic using the SMH4046 Controller to hot swap and actively control the output
levels of three DC/DC Converters while providing power on/off, cascade sequencing and output margining.
Note: This is an applications example only. Some pins, components and values are not shown.
© SUMMIT Microelectronics, Inc. 2004 • 1717 Fox Drive • San Jose CA 95131 • Phone 408 436-9890 • FAX 408 436-9897
The Summit Web Site can be accessed by “right” or “left” mouse clicking on the link: http://www.summitmicro.com/
2082 1.7 08/23/04
1




Summit Microelectronics

SMH4046 Datasheet Preview

SMH4046 Datasheet

Active DC Output Control (ADOCTM) Power Manager

No Preview Available !

www.DataSheet4U.com
VCC12 ( +6V to +14V)
5.0V
3.3V
2.0V
1.8V
1.5V
SMH4046
Preliminary Information
RESET
tDPONA
tDPONB
tDPONC
tDPOND
tDPONE
tDPONF
--- tPTO---
Figure 2 – Example Power Supply Cascade Sequencing and System Initialization Using the SMH4046
GENERAL DESCRIPTION
The SMH4046 is a fully integrated hot swap controller
intended for use on add-in cards that are hot swapped
from powered-on host platforms. The SMH4046
performs a variety of tasks starting with the validation
of proper card insertion and the presence of “in-spec”
voltages at the host platform interface.
Once the SMH4046 switches power on, it continues to
monitor the back-end power to the add-in card and the
host power supply. When programmed to do so, the
SMH4046 immediately asserts the RESET outputs
and powers-down the add-in card when the 12V, 5V or
3.3V supplies drop below a programmable UV or
above an OV threshold.
In addition to the power control for the add-in card, the
SMH4046 provides status signals that can be
employed by the host for the control of bus interface
components.
On-chip EEPROM memory can be used to store serial
ID numbers or other pertinent information for the
individual card or as general-purpose memory. The
FPGA configuration-interface provides a direct
interface for simplified access to the add-in card’s
FPGAs using the I2C interface.
The SMH4046 has the ability to monitor and sequence
up to six power supplies (Figure 1). The SMH4046 can
monitor the 12V input and the internal and external
temperature sensors. The SMH4046 has four
operating modes: Power-on sequencing mode,
monitor and control mode using Active DC Output
Control (ADOC), supply margining mode using ADOC,
and Power-off sequencing mode.
Power-on sequencing can be initiated via the
HST_PWR pin or through the serial interface. In this
mode, the SMH4046 sequences the power supply
channels on in any order by activating the PUPx,
VGATE and DRVREN# outputs while monitoring the
respective converter and host voltages to ensure
correct cascading of the supplies. Cascade-
sequencing is the ability to hold off the next
sequenced supply until the previous supply reaches a
programmed threshold voltage (See Figure 2). A
programmable sequence termination timer can be set
to disable all channels if the power-on sequence stalls.
During this mode, the HEALTHY# output remains
inactive and the RESET output remains active. When
the HEALTHY# output is true and RESET is false, that
signals the end of power-on sequencing mode.
Once the Power-on sequencing mode is complete, the
SMH4046 enters monitor control mode. Once all
supplies have sequenced on and the voltages are
above the UV settings, the Active DC Output Control
(ADOC), if enabled, brings the three DC-DC converter
supply output voltages to their programmed nominal
settings and adjusts the output voltage under all load
conditions. This feature is especially useful for
supplies without sense lines as the monitor VMx pins
can be routed and sense variations at the load. Typical
converters have ±2 to ±5% accuracy output voltage
ratings. The Active DC Output Control feature of the
SMH4046 increases the accuracy to ±0.5%.
Summit Microelectronics, Inc
2082 1.7 08/23/04
2


Part Number SMH4046
Description Active DC Output Control (ADOCTM) Power Manager
Maker Summit Microelectronics
Total Page 30 Pages
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