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SMB214C Arkusz danych(PDF) 2 Page - Summit Microelectronics, Inc.

Numer części SMB214C
Szczegółowy opis  High-power, Three-channel Programmable DC-DC System Power Managers
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Producent  SUMMIT [Summit Microelectronics, Inc.]
Strona internetowa  http://www.summitmicro.com
Logo SUMMIT - Summit Microelectronics, Inc.

SMB214C Arkusz danych(HTML) 2 Page - Summit Microelectronics, Inc.

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SMB214A/B/C
Preliminary Information
Summit Microelectronics, Inc.
2128 2.0 6/20/2008
2
The SMB214A/B/C are fully programmable DC-DC
controllers
that
incorporate
power
delivery and
advanced power monitoring and control functionality.
The devices integrate three synchronous “buck” step-
down controllers in a space saving 5x5 QFN-32
package.
The SMB214A uses a fixed 400kHz whereas the
SMB214B uses a fixed 800kHz, and the SMB214C a
fixed 1MHz Pulse Width Modulation (PWM) control
circuit.
A type-three voltage mode compensation
network is used offering a cost effective solution without
compromising transient response performance.
By
utilizing external N- and P–type MOSFET transistors
the efficiency and load current level can be customized
to fit a wide array of system requirements.
The SMB214A/B/C contain three buck outputs capable
of producing an output voltage less than the input
voltage. Each buck output voltage is set by an internal
resistor divider and a programmable voltage reference.
The integrated resistor divider eliminates the cost and
space necessary for external components and has
several
programmable
values.
Through
the
programmability of the reference and the resistor
divider, practically any output voltage smaller than the
battery can be produced without the need to change
external components.
The SMB214A/B/C are capable of power-on/off
cascade sequencing where each channel can be
assigned one of three unique sequence positions.
During sequencing each channel in a given sequencing
position is guaranteed to reach its programmed output
voltage before the channel(s) occupying the next
sequence position initiate their respective soft-start
sequence.
A unique programmable delay exists
between each power on/off sequence position.
In
addition to power on/off sequencing all supplies can be
powered on/off individually through an I
2C command or
by assertion of the enable pin.
Each output voltage is monitored for under-voltage and
over-voltage (UV/OV) conditions, using a comparator-
based circuit where the output voltage is compared
against an internal programmable reference.
An
additional feature of the output voltage monitoring is a
programmable glitch filter capable of digitally filtering a
transient OV/UV fault condition from a true system
error. When a fault is detected for a period in excess of
the glitch filter, all supplies may be sequenced down or
immediately disabled and an output status pin can be
asserted.
The current system status is always
accessible via internal registers containing the status of
all three channels.
The SMB214A/B/C also possess an Under-voltage
Lockout (UVLO) circuit to ensure the devices will not
power up until the input voltage has reached a safe
operating voltage.
The UVLO function exhibits
hysteresis, ensuring that noise or a brown out voltage
on the supply rail does not inadvertently lead to a
system failure.
The
SMB214A/B/C
provide
dynamic
voltage
management over all of their output voltages. Through
an I
2C command, all output voltage levels can be
increased or decreased to a pre-programmed level. In
addition, each output is slew rate limited by soft-start
circuitry that requires no external capacitors.
All programmable settings on the SMB214A/B/C are
stored in non-volatile registers and are easily accessed
and modified over an industry standard I
2C serial bus.
For fastest prototype development times Summit offers
an evaluation card and a Graphical User Interface
(GUI).
GENERAL DESCRIPTION


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