MCP73827-4.2VUA Datasheet MCP73827-4.1VUA, MCP73827-4.2VUA, MCP73827-4.1VUATR | P7-P9

MCP73827

Note: Unless otherwise indicated, I

OUT

= 10 mA, Constant Voltage Mode, T

= 25°C. Refer to Figure 1-1 for test circuit.

FIGURE 2-13: Line Transient Response.

FIGURE 2-14: Line Transient Response.

FIGURE 2-15: Load Transient Response.

FIGURE 2-16: Load Transient Response.

MCP73827

3.0 PIN DESCRIPTION

The descriptions of the pins are listed in Table 3-1.

TABLE 3-1: Pin Function Table.

3.1 Logic Shutdown (SHDN)

Input to force charge termination, initiate charge, or ini-

tiate recharge.

3.2 Battery Management 0V Reference

(GND)

Connect to negative terminal of battery.

3.3 Charge Status Output (MODE)

Open-drain drive for connection to an LED for charge

status indication. Alternatively, a pull-up resistor can be

applied for interfacing to a microcontroller. A low

impedance state indicates foldback current limit or con-

trolled current phase. A high impedance indicates con-

stant voltage phase or battery cell disconnected.

3.4 Charge Current Monitor (IMON)

Amplified output of the voltage difference between V

and V

SNS

. A host microcontroller can monitor this out-

put with an A/D converter.

3.5 Cell Voltage Monitor Input (VBAT)

Voltage sense input. Connect to positive terminal of

battery. Bypass to GND with a minimum of 10 µF to

ensure loop stability when the battery is disconnected.

A precision internal resistor divider regulates the final

voltage on this pin to VREG.

3.6 Drive Output (VDRV)

Direct output drive of an external P-channel MOSFET

pass transistor for current and voltage regulation.

3.7 Charge Current Sense Input (VSNS)

Charge current is sensed via the voltage developed

across an external precision sense resistor. The sense

resistor must be placed between the supply voltage

) and the source of the external pass transistor. A

50 mΩ sense resistor produces a fast charge current of

1 A, typically.

3.8 Battery Management Input Supply

(VIN)

A supply voltage of 4.5V to 5.5V is recommended.

Bypass to GND with a minimum of 10 µF.

Pin Name Description

1 SHDN Logic Shutdown

2 GND Battery Management

0V Reference

3 MODE Charge Status Output

MON

Charge Current Monitor

BAT

Cell Voltage Monitor Input

DRV

Drive Output

SNS

Charge Current Sense Input

Battery Management

Input Supply

MCP73827

4.0 DEVICE OVERVIEW

The MCP73827 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 MCP73827 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

MCP73827 initiates a charge cycle. The charge status

output, MODE, is pulled low throughout throughout the

preconditioning and controlled current phases (see

Table 5-1 for charge status outputs). If the cell is below

the preconditioning threshold, 2.4V typically, the

MCP73827 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 V

SNS

input developed by the drop

across an external sense resistor, R

SENSE

, and the out-

put voltage, V

BAT

. Fast charge continues until the cell

voltage reaches the regulation voltage, V

REG

4.3 Constant Voltage Regulation

When the cell voltage reaches the regulation voltage,

REG

, constant voltage regulation begins. The

MCP73827 monitors the cell voltage at the V

BAT

pin.

This input is tied directly to the positive terminal of the

battery. The MCP73827 is offered in two fixed-voltage

versions for battery packs with either coke or graphite

anodes: 4.1V (MCP73827-4.1) and 4.2V

(MCP73827-4.2).

4.4 Charge Cycle Completion

The charge cycle can be terminated by a host micro-

controller when the output of the charge current moni-

tor, I

MON

, has diminished below approximately 10% of

the peak output voltage level. Alternatively, the transi-

tion of the charge status output, MODE, can be used to

initialize a timer to terminate the charge. The charge is

terminated by pulling the shutdown pin, SHDN

, to a

logic Low Level.

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15 P16-P18 P19-P20

MCP73827-4.2VUA

Mfr. #:

Buy MCP73827-4.2VUA

Manufacturer:

Microchip Technology

Description:

Battery Management W/ Charge Curnt Mon

Lifecycle:

New from this manufacturer.

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MCP73827-4.2VUA

MCP73827-4.2VUA

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