TDF8553J datasheet(28/47 Pages) NXP

28 / 47 page

TDF8553J_1

Objective data sheet

Rev. 01 — 3 December 2008

28 of 47

NXP Semiconductors

TDF8553J

× 50 Watt power ampliﬁer and multiple voltage regulator

[1]

The quiescent current is measured in standby mode when RL = ∞.

[2]

The dropout voltage of regulator 3 is the voltage difference between VDCDC and VO(reg).

[3]

The dropout voltage of a regulator is the voltage difference between VP and VO(reg).

[4]

At current limit, VO(reg) is held constant; see Figure 6.

[5]

The foldback current protection limits the dissipation power at short-circuit; see Figure 6.

[6]

The dropout voltage of regulator 2 is the voltage difference between VBUCAP and VO(reg).

[7]

Unbiased switch-supply IL is measured in supply line VP.

[8]

Regulator output still in regulation at applied test voltage, therefore the actual dropout voltage can not be measured.

SVRR

supply voltage rejection ratio

fripple = 120 Hz;

Vripple = 2 V (p-p)

Vdo

dropout voltage

VP = 4.75 V; IO = 100 mA

[3] -

0.4

0.8

output current

VO > 4.0 V

[4] 150

350

IOS

output short-circuit current

RL < 0.5 Ω

[5] 50

125

Line regulation

∆V

output voltage variation

10 V

≤ V

P ≤ 18 V

Load regulation

∆V

output voltage variation

0.5 mA

≤ I

O ≤ 100 mA

100

Power switch 1 (pin SW1) antenna

Vdo

dropout voltage

IO = 300 mA

0.6

0.8

IO = 400 mA

0.6

1.1

output current

VO ≥ 8.5 V

[4] 0.5

IOS

output short-circuit current

RL ≤ 0.5 Ω

[5] -

250

leakage current

VO = 18 V; VP = 0 V

[7] -

250

µA

Power switch 2 (pin SW2) ampliﬁer

Vdo

dropout voltage

IO = 300 mA

0.6

0.8

IO = 400 mA

0.6

1.1

output current

VO ≥ 8.5 V

[4] 0.5

IOS

output short-circuit current

RL ≤ 0.5 Ω

[5] -

250

leakage current

VO = 18 V; VP = 0 V

[7] -

250

µA

Backup switch

Ibu

backup current (DC)

VBUCAP ≥ 6 V

0.4

1.5

VCL

clamping voltage

VP =30V; IO(reg2) = 100 mA

Vdo

dropout voltage

IO = 500 mA; (VP − VBUCAP)

0.8

1.2

Table 16.

Characteristics …continued

Tamb =25 °C; VDCDC; VP = 14.4 V; RL =4 Ω; measured in the test circuit Figure 26; unless otherwise speciﬁed.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

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