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SAA1504T/N1

Safety IC

Philips Electronics 

Philips Semiconductors

Safety IC

Objective specification

SAA1504T

Disable mode

When the charge or discharge current exceeds the

specified maximum value, the disable mode is entered.

Detection of the maximum charge or discharge current is

only activated when the outputs are HIGH (CO = 1 and

DO = 1) as explained next.

If the safety IC is in the Power-down mode and a charge

current is detected (e.g. VVM = −0.6 V) the normal

operating mode will be entered when Vbat > 2.6 V.

Because of a minimum time in which the gate capacitors

have to be charged, VVM = −0.6 V for a small period, when

the safety IC is already in the normal operating mode.

VVM = −0.6 V could also occur when the battery is charged

with a current exceeding the maximum charge current.

To prevent that a maximum charge current is detected

when coming from the Power-down mode a delay is

included to ensure charging of both outputs CO and DO.

So entering of the disable mode is enabled when both

outputs CO and DO are fully charged or after a certain

delay. The delay is necessary to activate the current

protection even in case the outputs CO or DO can not be

fully charged.

The same applies for entering the disable mode when the

safety IC is in the discharge enable mode.

The delay of the current protection as a function of the

sense voltage VVM (for charge and discharge) is given in

Fig.5.

The disable mode is also entered when the junction

temperature exceeds 100 °C. When the temperature

drops below 60 °C and at the absence of a charger or load,

the safety IC will return to its previous mode.

Status output

The status of the safety IC is available on pin ST.

Table 1 Functional table of the status output

MODE

Normal operating

Charge inhibit

Discharge enable

Power-down

Disable

OUTPUT PIN ST

LOW

HIGH

LOW

LOW

HIGH (note 1)

Note

1. Only when a charger is connected.

LIMITING VALUES

In accordance with the Absolute Maximum Rating System (IEC 60134); voltages measured with respect to pin VSS.

SYMBOL

PARAMETER

CONDITION

MIN. MAX. UNIT

VCC

VCC(clamp)

ICC(clamp)

Vrev

positive battery sense input voltage

clamping voltage

clamping current

reverse charger voltage

VVM

VST

Tamb

Tstg

negative sense input voltage

voltage on pin ST

ambient temperature

storage temperature

DC constant

ICC(clamp) = 7 mA; t < 60 ms

Vrev = −(VCC − VVM);

VVM positive with respect to VCC

−0.3

+4.5

V

−

8.5

V

−

7

mA

−

20

V

VCC − 20 VCC + 20 V

VVM

VCC

V

−25

+80

°C

−55

+150

°C

THERMAL CHARACTERISTICS

SYMBOL

PARAMETER

Rth(j-a)

thermal resistance from junction to ambient

CONDITIONS

in free air

QUALITY SPECIFICATION

In accordance with “SNW-FQ-611-D” and JEDEC class III.

VALUE

160

UNIT

K/W

2000 Mar 07

7

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