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SMB118 Datasheet(PDF) 2 Page - Summit Microelectronics, Inc. |
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SMB118 Datasheet(HTML) 2 Page - Summit Microelectronics, Inc. |
2 / 1 page 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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