ACT8810 datasheet(44/54 Pages) ACTIVE-SEMI

44 / 54 page

ActivePath

TM CHARGER

ACT8810

Rev 9, 15-Nov-12

Innovative Power

- 44 -

www.active-semi.com

ActivePMU

TM and ActivePathTM are trademarks of Active-Semi.

2CTM is a trademark of NXP.

FUNCTIONAL DESCRIPTION

General Description

The ACT8810 incorporates Active-Semi's patent-

pending ActivePath architecture. ActivePath is a

complete battery-charging and system power-

management

solution

for

portable

hand-held

equipment. This circuitry performs a variety of

advanced battery-management functions, including

automatic selection of the best available input

supply, current-management to ensure system

power availability, and a complete, high-accuracy

(±0.5%), thermally regulated, full-featured single-

cell linear Li+ charger with an integrated 12V power

MOSFET.

ActivePath Architecture

Active-semi's

patent-pending

ActivePath

architecture performs three important functions:

1) Input Protection,

2) System Configuration Optimization, and

3) Battery-Management

Input Protection

At the input of the ACT8810's ActivePath circuit is

an internal, low-dropout linear regulator (LDO) that

regulates the system voltage (VSYS). This LDO

features a 12V power MOSFET, allowing the

ActivePath

system to withstand input voltages of up

to 12V, and additionally includes a variety of other

protection features, including current limit protection

and input over-voltage protection.

The ActivePath circuitry provides a very simple

means of implementing a solution that safely

operates within the current-capability limitations of a

USB port while taking advantage of the high output-

current capability of an AC adapter, when available.

ActivePath

limits the total current drawn from the

input supply to a value set by the ACIN input; when

ACIN is driven to a logic-low ActivePath operates in

“USB Mode” and limits the current to either 500mA

(when CHGLEV is driven to a logic-high) or to

100mA (when CHGLEV is driven to a logic-low),

and when ACIN is driven to a logic-high ActivePath

operates in “AC-Mode” and limits the input current

to 2A. In either case, ActivePath's DCCC circuitry,

described

below,

allows

the

input

overload

protection to be adjusted to accommodate a wide

range of input supplies.

System Configuration Optimization

ActivePath

circuitry automatically detects the state

of the input supply, the battery, and the system, and

automatically reconfigures itself to optimize the

power system. If the input supply is present,

ActivePath

powers the system in parallel with

charging the battery, so that system power and

charge current can be independently managed to

satisfy all system power requirements. This allows

the battery to charge as quickly as possible, while

ensuring that the total system current does not

exceed the capability of the input supply. If the input

supply is not present, however, then ActivePath

automatically configures the system to draw power

from the battery. Finally, if the input is present and

the system current requirement exceeds the

capability of the input supply, such as under

momentary peak-power consumption conditions,

ActivePath

automatically

configures

itself

for

maximum power capability by drawing system

power from both the battery and the input supply.

Battery Management

ActivePath

includes a full-featured battery charger

for single-cell Li-based batteries. This charger is a

full-featured, intelligent, linear-mode, single-cell

charger for Lithium-based cells, and was designed

specifically to provide a complete charging solution

with minimum system design effort.

The core of the ActivePath's charger is a CC/CV

(Constant-Current/Constant-Voltage),

linear-mode

charge controller. This controller incorporates

current and voltage sense circuitry, an internal

80mΩ power MOSFET, a full-featured state-

machine that implements charge control and safety

features, and circuitry that eliminates the reverse-

blocking diode required by conventional charger

designs.

This charger also features thermal-regulation

circuitry that protects it against excessive junction

temperature, allowing the fastest possible charging

times, as well as proprietary input protection

circuitry that makes the charger robust against input

voltage transients that can damage other chargers.

The charge termination voltage is highly accurate

(±0.5%), and features a selection of charge safety

timeout periods that protect the system from

operation with damaged cells. Other features

include pin-programmable fast-charge current and

ACT8810 数据表(PDF) 44 Page - Active-Semi, Inc

ACT8810 数据表(HTML) 44 Page - Active-Semi, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54

数据表下载

链接网址

ACT8810 数据表(PDF) 44 Page - Active-Semi, Inc

ACT8810 数据表(HTML) 44 Page - Active-Semi, Inc

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54

数据表 下载

链接网址

数据表下载