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SMB118 Arkusz danych(PDF) 2 Page - Summit Microelectronics, Inc.

Numer części SMB118
Szczegółowy opis  Seven-Channel Programmable DC-DC Power Manager with Battery Charger
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Producent  SUMMIT [Summit Microelectronics, Inc.]
Strona internetowa  http://www.summitmicro.com
Logo SUMMIT - Summit Microelectronics, Inc.

SMB118 Arkusz danych(HTML) 2 Page - Summit Microelectronics, Inc.

  SMB118 Datasheet HTML 1Page - Summit Microelectronics, Inc.  
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SMB118/218
Summit Microelectronics, Inc
2107 3.0 10/15/2008
2
The SMB118 and SMB218 are fully programmable
power supply and battery managers that regulate,
sequence, monitor, and margin, an entire power
subsystem while controlling the charging of a lithium-ion
battery pack. They feature 6 voltage outputs, consisting
of:
three
synchronous
PWM
“Buck”
step-down
converters, one configurable PWM “Boost or Buck”
converter, one PWM “Boost” step-up converter, one Low
Dropout
(LDO)
linear
regulator,
and
a
fully
programmable Li-Ion battery charger.
The SMB118 and SMB218 regulate each of the six
output channels to an accuracy of
±1.5% (typical). The
output
is
individually
programmed and
can be
reprogrammed via the I
2C interface. In addition, several
sophisticated power management functions are built-in.
The SMB118 and SMB218 are capable of power-on/off
cascade sequencing where each channel can be
assigned one of six sequence positions. Supplies may
also be individually powered on/off through an I
2C
command or by assertion of the enable pin. Cascade
sequencing, unlike time based sequencing, uses
feedback to ensure that each output is valid before the
next channel is enabled.
Each output voltage and the battery are monitored for
under-voltage and over-voltage conditions, using a
comparator based scheme. In the event of a fault, all
supplies may be sequenced down or immediately
disabled. Multiple output status pins are provided to
notify host processors or other supervisory circuits of
system faults.
The SMB118 and SMB218 feature an Under-voltage
Lockout (UVLO) circuit to ensure the IC will not power up
until the battery voltage has reached a safe operating
voltage. The UVLO function exhibits hysteresis, ensuring
that noise on the supply rail does not inadvertently cause
faults on the internally regulated supply.
In the event of a system fault, all monitored supplies may
trigger fault actions such as power-off, or force-shutdown
operations. Each output on the SMB118 and SMB218
may also be turned off individually at any point through
an I
2C command or by a programmable enable pin.
When used in portable applications, the devices are
powered from the main system battery. This input is
continuously monitored for under-voltage conditions.
There are two under-voltage settings for this supply;
both are user programmable and have a corresponding
status pin. When the first threshold level is reached, the
POWER_FAIL pin is asserted and latched. When the
second threshold level is reached on the main supply,
the nBATT_FAULT pin is asserted.
The SMB118 and SMB218 are equipped with three
synchronous Buck outputs and one “Buck-or-Boost”
output that use a 1MHz oscillator frequency. The
feedback circuitry on each step-down channel is
simplified by an internal programmable resistor divider
(Buck-or-Boost uses external resistor divider).
The SMB118 and SMB218 are equipped with one Boost
output that uses a 1MHz oscillator, and an asynchronous
topology reducing the necessity for an additional
external MOSFET driver. This Boost output also uses an
external p-channel sequencing MOSFET to isolate load
from the battery when not needed.
A Low Dropout (LDO) linear regulator with an adjustable
1.5V to 3.75V output provides a small dropout voltage
and ripple free supply that is optimal for “always on”
microcontrollers. The LDO has a separate input supply
pin.
The SMB118 and SMB218 provide margining control
over all of its output voltages. Through an I
2C command,
all outputs can be margined by up to
±10% of the
nominal output voltage. 7-level dynamic voltage
management is also available for one of the channels. 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 SMB118 and SMB218
are stored in non-volatile registers and are easily
accessed and modified over an industry standard I
2C
serial bus. For fastest possible production times Summit
offers an evaluation card and a Graphical User Interface
(GUI).
GENERAL DESCRIPTION
PLEASE NOTE: The SMB118 has entered End-of-Life.


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