UBA2007TKSLASHN2 datasheet(7/19 Pages) TI

7 / 19 page

2003 Oct 01

Philips Semiconductors

Product speciﬁcation

Charge switch

UBA2007

Notes

1. X = don’t care;

L = LOW voltage level;

H = HIGH voltage level.

2. Currents in the other direction are blocked.

REVERSE and

SLOW and FAST

CHARGE

switch low

ohmic

charger to

battery

yes

REVERSE and

SLOW and FAST

CHARGE

switch low

ohmic

battery to

charger

REVERSE and

SLOW and FAST

CHARGE

switch high

ohmic

none

CUR

MOD

REV

MOD

HIGH

TEMP

HIGH

BAT

CHGOK_N

VBAT

> 3.1 V

MODE

FUNCTION

CURRENT

DIRECTION(2)

7.2

OFF mode

In the OFF mode the current path between charger and

battery is fully switched off. In addition all internal circuitry

is switched off. The battery is not loaded by the UBA2007

in this situation.

The OFF mode is entered if:

• SWMOD, CURMOD and REVMOD are LOW.

• REVMOD is LOW and CHGOK_N is HIGH.

7.3

SHUTDOWN mode

The SHUTDOWN mode corresponds to switching off the

charging path between the pins BAT and CHG. The circuit

will enter the SHUTDOWN mode in the following cases:

• Overvoltage detected on pin BAT

• Undervoltage detected on pin BAT while in REVERSE

mode

• Overheat detected on the die.

In the case of overvoltage shutdown, the state is latched

internally and can be reset only by disconnecting the

charger wall plug.

7.4

SLOW CHARGE mode

In the SLOW CHARGE mode a constant current is applied

to the battery. SLOW CHARGE mode is entered when the

SWMOD and REVMOD input pins are made LOW, pin

CURMOD is HIGH, the charger input voltage is at least

2.5 V and VCHG >VBAT.

The SLOW CHARGE mode is stopped when the voltage

on the BAT pin increases above the maximum battery

voltage or when a too high die temperature occurs.

7.5

FAST CHARGE mode

In the FAST CHARGE mode the switch (see Fig.1) is

turned on slowly by the internal circuitry. The FAST

CHARGE mode is entered when the SWMOD input signal

is HIGH.

The current through the switch is monitored by the current

limiting circuit. When this current exceeds the predefined

current limit, it is kept constant by reducing the drive

voltage of the switch.

The current limit is adjustable, from 50 mA to 2 A, through

an external resistor connected to the RLIMF pin. The

voltage on RLIMF is proportional to the current flowing

through the switch (see Section 11.3).

The FAST CHARGE mode is stopped when the voltage on

the BAT pin increases above the maximum battery voltage

or when a too high die temperature occurs.

Attention: RLIMF cannot trim the current limit while in

SLOW CHARGE or REVERSE modes.

Remark: The dissipation inside the UBA2007 will increase

strongly when the current limitation is activated, this might

lead to activation of the thermal protection.

UBA2007TK/N2 Datasheet(PDF) 7 Page - Texas Instruments

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