SMH4046 Datasheet, PDF (1/51 Pages) List of Unclassifed Manufacturers – Hot-Swap, Active DC Output Control (ADOCTM) Power Manager with I2C lnterface

SMH4046
Preliminary Information ¹ (See Last Page)
Hot-Swap, Active DC Output Control (ADOC^TM) 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 (ADOC^TM) 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
• I²C^TM 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
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 (ADOC^TM)
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.
ADOC^TM control of the three DC/DC converters
maintains their accuracy to within ±0.5% of the set
point using an internal voltage reference. ADOC^TM 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.
TYPICAL APPLICATIONS DRAWING
BD_SEL1#
FPGA
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
TRIMA
PUPA
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
D
G
47nF
S
1uF
47nF
270k
10
G
DC/DC #1
TRIM
OE
VIN
VOUT
DC/DC #2
TRIM
OE
VIN
VOUT
TRIMDC/DC ^#3
OE
VOUT
VIN
D
G
47nF
S
S
FS
Vout1
Vout2
Vout3 ^{•Hot swap}
•ADOC^TM
•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 [phone] • FAX [phone]
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2082 1.7 08/23/04
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