L9396 datasheet(34/109 Pages) STMICROELECTRONICS

34 / 109 page

Power supply

L9396

34/109

DS12539 Rev 6

3.10

Protected battery switch

The device provides a fully protected switched battery output VB_SW, always active when

the device is not in stand-by mode and WD1 is correctly served. This functionality can be

used as further battery supply, e.g. for external sensors requiring battery level, or as a pull-

up voltage rail.

The output can be disabled through SPI. Should the VB_SW diagnostics detect an over

current condition, the output is turned off and the over current SPI fault is set. Once an over-

current condition is detected, the output can only be re-enabled through SPI command,

when the fault disappears, writing the bit PROTECTED BATTERY SWITCH COMMAND at

1 after the related OVER CURRENT flag is cleared on read.

All electrical characteristics are valid for the following conditions unless otherwise noted:

-40 °C ≤ Tj ≤ +175 °C; 4.5 ≤ VB = VBATP ≤ 19 V.

CVCC ESR

Output capacitor ESR

0.01

0.1

Ω

dVSR_ac

Line transient

response

All line, load;



dt = 10 µs

-5%

dVLR_ac

Load transient

response

All line, load;



dt = 10 µs

-5%

RDSon

High side Rds_ON

Ω

VCC_cur lim

Current limitation

125

240

VCC_oc

Overcurrent threshold

125

240

VCC_ilim_oc_delta

Delta_Ilim_Oc

VCC_cur_lim –

VCC_oc

0.1

100

tsoftstart

Softstart time

From 10% to 90% of

nominal output

voltage

345

1035

µs

Table 14. VCC regulator electrical characteristics (continued)

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

Table 15. Protected battery switch electrical characteristics

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Saturation voltage

VB – VB_SW @

max. current

0.5

Operating current

150

VB_SW_oc

Overcurrent

shutdown

-165

250

VB_SW _cur lim

Current limitation -

165

250

VB_SW _ilim_oc_delta

Delta_Ilim_Oc

VB_SW_cur_lim –

VB_SW_oc

0.1

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