MCP73834-NVI datasheet(11/26 Pages) MICROCHIP

Part #	MCP73834-NVI

Description	Stand-Alone Linear Li-Ion / Li-Polymer Charge Management Controller

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Manufacturer	MICROCHIP [Microchip Technology]

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DS22005A-page 11

MCP73833/4

4.1

Under Voltage Lockout (UVLO)

An internal under voltage lockout (UVLO) circuit

monitors the input voltage and keeps the charger in

shutdown mode until the input supply rises above the

UVLO threshold. The UVLO circuitry has a built in

hysteresis of 100 mV.

In the event a battery is present when the input power

is applied, the input supply must rise +150 mV above

the battery voltage before the MCP73833/4 becomes

operational.

The UVLO circuit places the device in shutdown mode

if the input supply falls to within +50 mV of the battery

voltage.

The UVLO circuit is always active. At any time the input

supply is below the UVLO threshold or within +50 mV

of the voltage at the VBAT pin, the MCP73833/4 is

placed in a shutdown mode.

During any UVLO condition, the battery reverse

discharge current shall be less than 2 µA.

4.2

Charge Qualification

For a charge cycle to begin, all UVLO conditions must

be met and a battery or output load must be present.

A charge current programming resistor must be

connected from PROG to VSS. If the PROG pin is open

or floating, the MCP73833/4 is disabled and the battery

reverse discharge current is less than 2 µA. In this

manner, the PROG pin acts as a charge enable and

can be used as a manual shutdown.

If the input supply voltage is above the UVLO

threshold,

but

below

VREG(Typ)+0.3V,

the

MCP73833/4 will pulse the STAT1 and PG outputs as

the device determines if a battery is present.

4.3

Preconditioning

If the voltage at the VBAT pin is less than the

preconditioning threshold, the MCP73833/4 enters a

preconditioning

or

trickle

charge

mode.

The

preconditioning threshold is factory set. Refer to

Section 1.0

“Electrical

Characteristics”

for

preconditioning threshold options.

In this mode, the MCP73833/4 supplies a percentage

of the charge current (established with the value of the

resistor connected to the PROG pin) to the battery. The

percentage or ratio of the current is factory set. Refer to

Section 1.0

“Electrical

Characteristics”

for

preconditioning current options.

When the voltage at the VBAT pin rises above the pre-

conditioning threshold, the MCP73833/4 enters the

constant current or fast charge mode.

4.4

Constant Current - Fast Charge

Mode

During the constant current mode, the programmed

charge current is supplied to the battery or load. The

charge current is established using a single resistor

from PROG to VSS. The program resistor and the

charge current are calculated using Equation 4-1:

EQUATION 4-1:

Constant current mode is maintained until the voltage

at the VBAT pin reaches the regulation voltage, VREG.

When constant current mode is invoked, the internal

timer is reset.

4.4.1

TIMER EXPIRED DURING CONSTANT

CURRENT - FAST CHARGE MODE

If the internal timer expires before the recharge voltage

threshold is reached, a timer fault is indicated and the

charge cycle terminates. The MCP73833/4 remains in

this condition until the battery is removed, the input

power is removed, or the PROG pin is opened. If the

battery is removed or the PROG pin is opened, the

MCP73833/4 enters the Standby mode where it

remains until a battery is reinserted or the PROG pin is

reconnected. If the input power is removed, the

MCP73833/4 is in Shutdown. When the input power is

reapplied, a normal start-up sequence ensues.

4.5

Constant Voltage Mode

When the voltage at the VBAT pin reaches the

regulation voltage, VREG, constant voltage regulation

begins. The regulation voltage is factory set to 4.20V,

4.35V, 4.40V, or 4.50V with a tolerance of ± 0.75%.

4.6

Charge Termination

The charge cycle is terminated when, during constant

voltage mode, the average charge current diminishes

below a percentage of the programmed charge current

(established with the value of the resistor connected to

the PROG pin) or the internal timer has expired. A 1 ms

filter time on the termination comparator ensures that

transient load conditions do not result in premature

charge cycle termination. The percentage or ratio of the

current is factory set. The timer period is factory set

and can be disabled. Refer to Section 1.0 “Electrical

Characteristics” for charge termination current ratio

and timer period options.

The charge current is latched off and the MCP73833/4

enters a charge complete mode.

IREG

1000V

RPROG

-----------------

=

Where:

RPROG = kilo-ohms

IREG = milliampere

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MCP73834-NVI Datasheet(PDF) 11 Page - Microchip Technology

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