MCP73837-AMISLASHMF datasheet(14/36 Pages) MICROCHIP

14 / 36 page

MCP73837/8

DS20002071C-page 14

 2007-2015 Microchip Technology Inc.

3.7

USB Port Current Regulation Set

(PROG2)

The MCP73837/8 USB port current regulation set input

(PROG2) is a digital input selection. A logic Low selects

a 1 unit load charge current; a logic High selects a 5

unit loads charge current. The precondition and termi-

nation current is internally set to the percentage levels

selected by the device part number. The current is

based on the selected unit load charge current, based

on the level of PROG2.

PROG2 also functions as the set point of termination

when the USB port is present. When PROG2 is float-

ing, the MCP73837/8 enters into Stand-By mode.

3.8

Power Good (PG)

Power Good (PG) is available only on MCP73837. PG

is an open-drain logic output for connection to an LED

for input power supply indication. Alternatively, a

pull-up resistor can be applied for interfacing to a host

microcontroller.

3.9

Timer Enable (TE)

Timer Enable (TE) is available only on MCP73838. TE

enables the built-in safety timer when it is pulled Low,

and disables the built-in safety timer when it is pulled

High.

3.10

Battery Temperature Monitor

(THERM)

MCP73837/8 continuously monitors the battery

temperature during a charge cycle by measuring the

voltage between the THERM and VSS pins. An internal

50 µA current source provides the bias for the most

common

10 k

 negative-temperature coefficient

thermistors (NTC).

3.11

Battery Charge Control Output

(VBAT)

Connect to the positive terminal of Li-Ion/Li-Polymer

batteries. Bypass to VSS, with a minimum of 1 µF, to

ensure loop stability when the battery is disconnected.

3.12

Exposed Thermal Pad (EP)

The 10-lead 3 x 3 mm DFN package has an exposed

metal pad on the bottom of the package. It gives the

device better thermal characteristics by providing a

good thermal path to a PCB ground plane.There is an

internal electrical connection between the EP and the

VSS pin; they must be connected to the same potential

on the PCB.

Note:

The built-in safety timer is available for

both MCP73837 and MCP73838 in the

following options: Disable, 4 HR, 6 HR,

and 8 HR.

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