PM8805 datasheet(13/45 Pages) STMICROELECTRONICS

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DS12813 Rev 1

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PM8805

Electrical specifications

3.4

Electrical characteristics

(VDD=VOB=48 V, 1 nF from VCP to VDD, 100 nF on VB, TA = -40°C to 85°C unless

otherwise specified(a).)

a. Minimum and Maximum limits are guaranteed by test, design, or statistical correlation. Typical values represent

the most likely parametric norm at TA =25 °C, and are provided for reference only.

Table 6. Electrical characteristics

Symbol

Parameter

Test conditions

Min.

Typ.

Max. Unit

Undervoltage UVLO

Vuvlo_rising

UVLO release

Measured between PoE inputs(1)

VDD rising

38.0

41.5

Vuvlo_falling

UVLO lock-out

Measured between PoE inputs

VDD(1) falling

30.5

33.5

Vuvlo_hyst

UVLO hysteresis

VDD falling

7.5

Tduvlo_falling

UVLO lock-out delay

VDD falling

100

μs

Input bridges

Rdson_br

MOSFET Ron

30.5< VDD<57V, I=1A

150

mΩ

Vbron

Bridge ON max. voltage drop

30.5< VDD<57V, I=1A

180

300

Vbroff

Bridge OFF max. voltage drop

VDD<23V, I=44mA

1.4

1.8

Unbal

Bridge to Bridge resistance

unbalance

30.5< VDD<57V, I=1A, bridges ON

Vbfd

Backfeed voltage

100kΩ resistance between

unpowered PoE inputs(1), VDD=57V

2.7

Ileak

Leakage current

VDD=57V, current drawn by any

bridge input(1)

μA

ZCD_HS_thr

High-side MOSFET

comparator threshold

Measured between any bridge

input(1) and VDD

-25

ZCD_LS_thr

Low-side MOSFET

comparator threshold

Measured between any bridge input

and relevant ground(1)

ZCD_hyst

Comparators hysteresis

Td_ZCD

Comparators delay

μs

Charge pump(2)

Vcp

Charge pump voltage

Measured wrt VDD 30.5< VDD<57V

10nF on VCP pin

6.8

9.8

Icp

Capacitor charging current

VCP = VDD+7V

μA

Detection and classification

Von_det

Signature enable

Measured between PoE inputs(1)

VDD rising

2.5

Voff_det

Signature disable

Measured between PoE inputs(1)

VDD rising

10.5

13.0

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