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PDF SMT4504 Data sheet ( Hoja de datos )
| Número de pieza | SMT4504 | |
| Descripción | Four-Channel Loss-Less TrakkerTM Power Supply Manager | |
| Fabricantes | Micro Electronics | |
| Logotipo |  |
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SMT4504
Preliminary Information1 (See Last Page)
Four-Channel Loss-Less TrakkerTM Power Supply Manager
FEATURES & APPLICATIONS
• Loss-Less Tracking function
- No power MOSFET switches
• Programmable Slew-Rate, Tracking and Voltage
Monitoring Functions
• Directly Interfaces to DC-DC Converters,
Monolithic Controllers or LDOs
• Programmable Sequence Orders
• Programmable Tracking Slew Rates
• Eliminates Series Power MOSFETs
• Programmable OV/UV Threshold Limits
• Under Voltage Lock-Out (VDD and VCTRL_SUP)
• 4k-Bit user configurable Nonvolatile Memory
• I2C 2-wire serial bus for programming
configuration and monitoring status
Applications
• Monitor, Sequence and Slew-Rate Control of
Distributed Power and Point of Use Power
Supplies
• Multi-voltage Processors, DSPs, ASICs used in
Telecom, CompactPCI or server systems
SIMPLIFIED APPLICATIONS DRAWING
INTRODUCTION
The SMT4504 is an intelligent power supply
sequencer, tracker, and voltage monitor. The
SMT4504 tracks or sequences up to 4 power supplies
by uniquely controlling the Enable and TRIM (Soft-
Start) functions of DC-DC converters, Monolithic
Controllers or LDOs. Each Channel is individually
programmable for undervoltage/overvoltage threshold
settings, sequence position and slew rates. Two or
more supplies allocated to the same sequence
position are tracked, while assigning individual
supplies to a unique sequence position causes them
to be sequenced with controlled slew rates.
The SMT4504 monitors the supplies for faults and
is programmable to take any of several actions upon
the occurrence of a fault. The voltage monitoring
threshold step size is better than ±1%.
Power supply sequencing can be executed in any
order. During power-off sequencing, the SMT4504
sequences the supplies in the reverse order as power-
on.
Using the I2C interface, a host system can
communicate with the SMT4504 status register,
optionally control power-on/off software and utilize 4K-
bits of nonvolatile memory.
5V 5V
12V
VDD_CAP
VCTRLA
PUPA
I2C
BUS
PWR_ON
SDA SMT4504 VMA
SCL
PWR_ON#
VCTRLB
PUPB
DC-DC
Converter
VIN
TRIM
V+
ON/OFF V-
Monolithic
Controller
VIN
-E/A
V+
V-
Soft-Start
2.5VIN
GND
DSP/
µP/
NPU/
FPGA/
ASIC
1.2VIN
GND
VMB
IRQ#
Figure 1 – Applications Schematic, the SMT4504 Loss-Less TrakkerTM can track different types of supplies
together. Note: This is an applications example only. Some pins, components and values are not shown.
Summit Microelectronics, Inc
2071 1.1 01/07/05
1
1 page  
www.DataSheet4U.com
PIN DESCRIPTIONS
SMT4504
Preliminary Information
Pin Name
VCTRLC
VMC
VCTRLD
VMD
IRQ
HEALTHY
RST
LINK_B
LINK_A
GND
STATUSA
STATUSB
STATUSC
STATUSD
SEATED#
FS#
PWR_ON
VRLINK
SDA
SCL
A0
A1
A2
WP
MR#
GND
VDD
Type
OUT
IN
OUT
IN
OUT
OUT
OUT
I/O
I/O
PWR
OUT
OUT
OUT
OUT
IN
I/O
I/O
I/O
DATA
CLK
IN
IN
IN
IN
IN
PWR
PWR
Number
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
25
26
27
28
29
30
31
34
35
Function
Control voltage used to track/sequence the converters
Channel C converter output or sense+ line
Control voltage used to track/sequence the converters
Channel D converter output or sense+ line
Programmable active high/low open drain latched output. Asserted when
programmed power supply is in a fault condition.
Programmable active high/low output asserted when all Fault conditions are
clear
Programmable active high/low open drain output signals when all
programmed power supplies are within the monitored limits and the MR signal
is inactive. RST has a programmable timeout period with options for
0.64/50/100/200ms.
Active low open drain I/O connected to LINK_B pin other SMT4504’s for
linked operation
Active low open drain I/O connected to LINK_A pin other SMT4504’s for
linked operation
Ground of the part
Active low open drain output. Asserted when the channel is tracking and
between track off and track on.
Active low open drain output. Asserted when the channel is tracking and
between track off and track on.
Active low open drain output. Asserted when the channel is tracking and
between track off and track on.
Active low open drain output. Asserted when the channel is tracking and
between track off and track on.
Active low input internally pulled up to VDD_CAP with 75k ohm resistor
Force shutdown active low I/O used to turn off all converter enable signals.
Do not drive FS# high.
Active high I/O signals the start of the power sequencing. When asserted the
part will sequence the supplies on and when de-asserted the part will
sequence the supplies off. Do not drive PWR_ON high.
External tracking ramp reference
Bi-directional I2C Data line
I2C Clock line
I2C device bus address assignment pin.
I2C device bus address assignment pin.
I2C device bus address assignment pin.
Programmable active high/low write protect input. When asserted the
configuration registers are write protected and the write protect volatile
register is set.
Active low input. When asserted the RST output will be allowed to de-assert
after a reset timeout if there are no reset sources still active.
Ground of the part
Power supply of the part
Summit Microelectronics, Inc
2071 1.1 01/07/05
5
5 Page 
www.DataSheet4U.com
DEVELOPMENT HARDWARE & SOFTWARE
SMT4504
Preliminary Information
The end user can obtain the Summit SMX3200
programming system for device prototype
development. The SMX3200 system consists of a
programming Dongle, cable and WindowsTM GUI
software. It can be ordered on the website or from a
local representative. The latest revisions of all
software and an application brief describing the
SMX3200 is available from the website
(www.summitmicro.com).
The SMX3200 programming Dongle/cable interfaces
directly between a PC’s parallel port and the target
application. The device is then configured on-screen
via an intuitive graphical user interface employing
drop-down menus.
The Windows GUI software will generate the data and
send it in I2C serial bus format so that it can be
directly downloaded to the SMT4504 via the
programming Dongle and cable. An example of the
connection interface is shown in Figure 4.
When design prototyping is complete, the software
can generate a HEX data file that should be
transmitted to Summit for approval. Summit will then
assign a unique customer ID to the HEX code and
program production devices before the final electrical
test operations. This will ensure proper device
operation in the end application.
Positive
Supply
VDD_CAP
Top view of straight 0.1" x 0.1 closed-side
connector. SMX3200 interface cable conn
Pin 10, Reserved
Pin 8, Reserved
Pin 6, MR#
Pin 4, SDA
Pin 2, SCL
Pin 9, 5V
Pin 7, 10V
Pin 5, Reserv
Pin 3, GND
Pin 1, GND
SMT4504
MR#
SDA
SCL
10 9
87
65
43
21
0.1µF
Common
Ground
GND
Figure 4 – SMX3200 Programmer I2C serial bus connections to program the SMT4504.
Summit Microelectronics, Inc
2071 1.1 01/07/05
11
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet SMT4504.PDF ] | |
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