SMB110 datasheet(6/34 Pages) SUMMIT

6 / 34 page

SMB110

Preliminary Information

Summit Microelectronics, Inc

2099 2.3 3/1/2005

PIN DESCRIPTIONS

Pin Number

Pin Type

Pin Name

Pin Description

OUT

HEALTHY

The HEALTHY pin is an open drain output. High when all

enabled output supplies are within the programmed levels.

HEALTHY will ignore any disabled supply.

There is a

programmable glitch filter on the under-voltage and over-voltage

sensors so that short transients outside of the limits will be

ignored by HEALTHY. When used this pin should be pulled high

by an external pull-up resistor.

I/O

SDA

SDA (Serial Data) is an open drain bi-directional pin used as the

2C data line. SDA must be tied high through a pull-up resistor.

SCL

SCL (Serial Clock) is an open drain input pin used as the I

clock line. SCL must be tied high through a pull-up resistor.

OUT

VREF_OUT

The VREF_OUT (Voltage Reference) pin is a precision

reference output. When an inverting output is used, this pin acts

as a level shifting reference for the feedback circuitry. When the

inverting output is not used, this pin may be used as a

programmable reference.

COMP1_CH0

COMP1_CH0 (Channel 0 primary Compensation) pin is the

primary feedback input of the inverting controller.

COMP2_CH0

COMP2_CH0 (Channel 0 secondary Compensation) pin is the

second feedback input of the inverting controller

OUT

LSDRV_CH0

The LSDRV_CH0 (Channel 0 Low-side Driver) pin is the

switching node of the inverting buck-boost controller. The output

of this pin should be attached to the gate of an external p-

channel MOSFET driver.

HOST_RESET

The HOST_RESET pin is an active high reset input. When this

pin is asserted high, the nRESET output will immediately go low.

When HOST_RESET is brought low, nRESET will go high after

a programmed reset delay.

CAP

VBATT_CAP

The VBATT_CAP (VBATT Capacitor) pin is an external

capacitor input used to filter the internal supply.

PWR

VBATT

Power supply to part.

OUT

PCHSEQ_CH1

The PCHSEQ_CH1 (Channel 1 Sequence) pin is attached to an

external p-channel MOSFET and is used to enable the

corresponding channel 1 boost controller. PCHSEQ_CH1 uses

an internal 100

µA current sink for sequencing. This pin should

be pulled high through a parallel RC connection.

COMP1_CH1

The COMP1_CH1 (Channel 1 primary Compensation) pin is the

primary compensation input of the channel 1 boost controller.

COMP2_CH1

The COMP2_CH1 (Channel 1 secondary Compensation) pin is

the second compensation input of the channel 1 boost

controller.

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