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SMB110 Fiches technique(PDF) 3 Page - Summit Microelectronics, Inc.

No de pièce SMB110
Description  Five Channel Programmable DC-DC System Power Manager
Download  34 Pages
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Fabricant  SUMMIT [Summit Microelectronics, Inc.]
Site Internet  http://www.summitmicro.com
Logo SUMMIT - Summit Microelectronics, Inc.

SMB110 Fiches technique(HTML) 3 Page - Summit Microelectronics, Inc.

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SMB110
Preliminary Information
Summit Microelectronics, Inc
2099 2.3 5/3/2005
3
The SMB110 is a fully programmable DC-DC controller
that monitors, margins, and cascade sequences. It has 5
voltage outputs, consisting of: two synchronous “buck”
step-down controllers, one “boost” step-up controller,
one “boost-buck” negative DC-DC controller, and one
LDO.
The SMB110 uses a fixed 800 kHz Pulse Width
Modulation (PWM) control circuit. A type three voltage
mode compensation network is used offering a cost
effective solution without compromising the transient
response. By utilizing external n and p–type MOSFET
transistors the efficiency and load current can be
customized to fit a wide array of system requirements.
The SMB110 integrates two buck outputs that are
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 less than the battery can
be produced without the need to change external
components.
In addition, the SMB110 integrates one boost output
capable of producing an output voltage greater than the
input voltage. The boost topology is asynchronous, using
a rectifying Schottky diode and eliminating the need for
an additional external MOSFET driver. An external p-
channel sequencing MOSFET’s accompanies the boost
channel in order to isolate the switching MOSFET from
the battery when disabled.
The SMB110 also contains one inverting buck-boost
output capable of producing a negative output voltage
less than or greater than, the input voltage. The buck
boost output is asynchronous and drives an external p-
channel MOSFET.
A Low DropOut linear regulator with fixed 3.3 volt output
provides a low current supply for “always on”
microcontrollers. The LDO has a special input supply
that is internally multiplexed between the LDO supply pin
and the battery. This ensures that the LDO will always
be active over the recommended operating voltages
(2.7V – 6.0V).
The SMB110 is capable of power-on/off cascade
sequencing where each channel can be assigned one of
four unique sequence positions. During sequencing each
channel in a given sequence 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
an 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 one of two output status pins
can be asserted. The current system status is always
accessible via internal registers containing the status of
all four channels.
The SMB110 possesses an Undervoltage Lockout
(UVLO) circuit to ensure the SMB110 will not power up
until the battery 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 SMB110 provides margining control over all of its
output voltages. Through an I
2C command, all outputs
can be margined to any voltage setting within the
nominal output voltage rage. Margining creates three
pre-programmed settings that each channel can be set
to via an I
2C command. Margining is ideal when used
with the boost channel configured as an LED driver
where margining provides three brightness settings.
In addition, each output is slew rate limited by soft-start
circuitry that is user programmable and requires no
external capacitors.
All programmable settings on the SMB110 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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