LTC1479IG データシートの表示（PDF） - Linear Technology

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LTC1479IG

PowerPath Controller for Dual Battery Systems

Linear Technology 

LTC1479

PIN FUNCTIONS

External Power Supply Pins

DCIN (Pin 1): Supply Input. A 330Ω resistor should be

put in series with this pin and the external DC power

source. A 0.1µF bypass capacitor should be connected to

this pin as close as possible.

DCDIV (Pin 2): Supply Divider Input. This is a high

impedance comparator input with a 1.215V threshold

(rising edge) and approximately – 35mV hysteresis.

BAT1, BAT2 (Pins 35, 34): Supply Input. These two pins

are the inputs from the two batteries. A 1µF bypass

capacitor should be connected to each pin as close as

possible if there is no larger battery supply capacitor

within 2".

VBAT (Pin 32): Battery Voltage Sense. This pin connects

the top of the battery resistor ladder to either BAT1 or

BAT2.

BDIV (Pin 33): Battery Divider Input. A high impedance

comparator input with a 1.215V threshold (falling edge)

and approximately 35mV hysteresis.

VBKUP (Pin 36): Supply Input. This input supplies power to

the LTC1479 when in the backup mode of operation. A 1µF

bypass capacitor should be connected to the VBKUP pin as

close as possible if there is no larger backup supply

capacitor within 2".

Internal Power Supply Pins

VCCP (Pin 20): Power Supply Output. Bypass this output

with at least a 0.1µF capacitor. The VCCP power supply is

used primarily to power internal logic circuitry.

VCC (Pin 15): Power Supply Output. This is a nominal

3.60V output. Bypass this regulator output with a 2.2µF

tantalum capacitor. This capacitor is required for stability.

V+ (Pin 17): Supply. The V+ pin is connected via three

internal diodes to the DCIN, BAT1 and BAT2 pins and

powers the top of the VGG switching regulator inductor.

Bypass this pin with a 1µF/35V capacitor.

VGG (Pin 16): Gate Supply. This high voltage (36.5V)

switching regulator is intended only for driving the internal

micropower gate drive circuitry. Do not load this pin with

any external circuitry. Bypass this pin with a 1µF/50V

capacitor.

SW (Pin 18): Output. This pin drives the “bottom” of the

VGG switching regulator inductor which is connected

between this pin and the V + pin.

GND (Pin 19): Ground. The VGG and V + bypass capacitors

should be returned to this ground which is connected

directly to the source of the N-channel switch in the VGG

regulator.

Input Power Switches

GA, GB (Pins 4, 6): DCIN Switch Gate Drive. These two

pins drive the gates of the back-to-back N-channel switches

in series with the DCIN input.

SAB (Pin 5): Source Return. The SAB pin is connected to

the sources of SW A and SW B. A small pull-down current

source returns this node to 0V when the switches are

turned off.

GC, GD (Pins 7, 9): BAT1 Switch Gate Drive. These two

pins drive the gates of the back-to-back N-channel

switches in series with the BAT1 input.

SCD (Pin 8): Source Return. The SCD pin is connected to

the sources of SW C and SW D. A small pull-down current

source returns this node to 0V when the switches are

turned off.

GE, GF (Pins 10, 12): BAT2 Switch Gate Drive. These two

pins drive the gates of the back-to-back N-channel

switches in series with the BAT2 input.

SEF (Pin 11): Source Return. The SEF pin is connected to

the sources of SW E and SW F. A small pull-down current

source returns this node to 0V potential when the switches

are turned off.

SENSE + (Pin 13): Inrush Current Input. This pin should

be connected directly to the “top” (switch side) of the low

valued resistor in series with the three input power

selector switch pairs, SW A/B, SW C/D and SW E/F, for

detecting and controlling the inrush current into and out

of the power supply sources and the output capacitor.

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