MCP73826_13 datasheet(9/24 Pages) MICROCHIP

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 2002-2013 Microchip Technology Inc.

DS21705B-page 9

MCP73826

4.0

DEVICE OVERVIEW

The MCP73826 is a linear charge management con-

troller. Refer to the functional block diagram on page 2

and the typical application circuit, Figure 6-1.

4.1

Charge Qualification and

Preconditioning

Upon insertion of a battery or application of an external

supply, the MCP73826 verifies the state of the SHDN

pin. The SHDN pin must be above the logic high level.

If the SHDN pin is above the logic high level, the

MCP73826 initiates a charge cycle. If the cell is below

the preconditioning threshold, 2.4V typically, the

MCP73826 preconditions the cell with a scaled back

current. The preconditioning current is set to approxi-

mately 43% of the fast charge peak current. The pre-

conditioning safely replenishes deeply depleted cells

and minimizes heat dissipation in the external pass

transistor during the initial charge cycle.

4.2

Controlled Current Regulation - Fast

Charge

Preconditioning ends and fast charging begins when

the cell voltage exceeds the preconditioning threshold.

Fast charge utilizes a foldback current scheme based

on the voltage at the VSNS input developed by the drop

across an external sense resistor, RSENSE, and the out-

put voltage, VBAT. Fast charge continues until the cell

voltage reaches the regulation voltage, VREG.

4.3

Constant Voltage Regulation

When the cell voltage reaches the regulation voltage,

VREG, constant voltage regulation begins. The

MCP73826 monitors the cell voltage at the VBAT pin.

This input is tied directly to the positive terminal of the

battery. The MCP73826 is offered in two fixed-voltage

versions for battery packs with either coke or graphite

anodes:

4.1V

(MCP73826-4.1)

and

4.2V

(MCP73826-4.2).

4.4

Charge Cycle Completion

The charge cycle can be terminated by a host micro-

controller after an elapsed time from the start of the

charge cycle. The charge is terminated by pulling the

shutdown pin, SHDN, to a logic Low level.

Số phần tương tự - MCP73826_13

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Microchip Technology	MCP73826-4.1VCHTR	425Kb / 24P	Single Cell Lithium-Ion Charge Management Controller 01/18/02
	MCP73826-4.2VCHTR	425Kb / 24P	Single Cell Lithium-Ion Charge Management Controller 01/18/02
	MCP73826-42VCHTR	425Kb / 24P	Single Cell Lithium-Ion Charge Management Controller 01/18/02

More results

Mô tả tương tự - MCP73826_13

nhà sản xuất	tên linh kiện	bảng dữ liệu	Giải thích chi tiết về linh kiện
Microchip Technology	MCP73826	422Kb / 24P	Single Cell Lithium-Ion Charge Management Controller 2002-2013
Microchip Technology	MCP73826-42VCHTR	425Kb / 24P	Single Cell Lithium-Ion Charge Management Controller 01/18/02
ON Semiconductor	NCP1800	93Kb / 14P	Single-Cell Lithium Ion Battery Charge Controller November, 2004 ??Rev. 5
ON Semiconductor	NCP1800	87Kb / 14P	Single-Cell Lithium Ion Battery Charge Controller May, 2003 - Rev. 4
Shenzhen Huazhimei Semi...	HM4088	489Kb / 12P	Switched single-cell, two-cell lithium-ion/lithium polymer charge management chip
Microchip Technology	MCP73827	283Kb / 20P	Single Cell Lithium-Ion Charge Management Controller with Mode Indicator and Charge Current Monitor 2007
	MCP73828	499Kb / 24P	Single Cell Lithium-Ion Charge Management Controller with Charge Complete Indicator and Temperature Monitor 2002
	MCP73841	416Kb / 26P	Advanced Single or Dual Cell Lithium-Ion/ Lithium-Polymer Charge Management Controllers 1/29/12 2003-2013
Shenzhen Huazhimei Semi...	HM4203	1Mb / 8P	single-cell lithium-ion battery charge
Microchip Technology	MCP73841	414Kb / 24P	Advanced Single or Dual Cell Lithium-Ion/ Lithium-Polymer Charge Management Controllers 2004

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