SLMA002 datasheet(3/55 Pages) TI1

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ELECTRICAL CHARACTERISTICS

TPS54283,, TPS54286

SLUS749C – JULY 2007 – REVISED OCTOBER 2007

–40

°C ≤ T

J ≤ +125°C, VPVDD1 = VPVDD2 = 12 V, unless otherwise noted.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

INPUT SUPPLY (PVDD)

VPVDD1

Input voltage range

4.5

VPVDD2

IDDSDN

Shutdown

VEN1 = VEN2 = VPVDD2

150

µA

IDDQ

Quiescent, non-switching

VFB = 0.9V, Outputs off

1.8

3.0

SW node unloaded; Measured as BP sink

IDDSW

Quiescent, while-switching

current

VUVLO

Minimum turn-on voltage

PVDD2 only

3.8

4.1

4.4

VUVLO(hys)

Hysteresis

400

CBP = 10 µF, EN1 and EN2 go low

tSTART

(1) (2)

Time from startup to softstart begin

simultaneously

ENABLE (EN)

VEN1

Enable threshold

0.9

1.2

1.5

VEN2

Hysteresis

IEN1

Enable pull-up current

VEN1 = VEN2 = 0 V

µA

IEN2

tEN

(1)

Time from enable to soft-start begin

Other EN pin = GND

µs

BP REGULATOR (BP)

Regulator voltage

8 V < PVDD2 < 28 V

5.25

5.6

PVDD2 = 4.5 V; switching, no external load on

BPLDO

Dropout voltage

400

IBP

(1)

Regulator external load

IBPS

Regulator short circuit

4.5 V < PVDD2 < 28 V

OSCILLATOR

TPS54283

255

310

375

fSW

Switching frequency

kHz

TPS54286

510

630

750

tDEAD

(1)

Clock dead time

140

ERROR AMPLIFIER (EA) and VOLTAGE REFERENCE (REF)

VFB1

°C < T

J < +85°C

788

800

812

Feedback input voltage

VFB2

–40

°C < T

J < +125°C

786

812

IFB1

Feedback input bias current

IFB2

gM1

(1)

Transconductance

µS

gM2

(1)

SOFT START (SS)

TSS1

Soft start time

1.5

2.1

2.7

TSS2

OVERCURRENT PROTECTION

ICL1

Current limit channel 1

2.4

3.0

3.6

VILIM2 = VBP

1.15

1.50

1.75

ICL2

Current limit channel 2

VILIM2 = (floating)

2.4

3.0

3.6

VILIM2 = GND

1.15

1.50

1.75

VUV1

Low-level output threshold to declare a fault

Measured at feedback pin.

670

VUV2

THICCUP

(1)

Hiccup timeout

tON1(oc)

(1)

Minimum overcurrent pulse width

150

tON2(oc)

(1)

Ensured by design. Not production tested.

(2)

When both outputs are started simultaneously, a 20-mA current source charges the BP capacitor. Faster times are possible with a lower

BP capacitor value. More information can be found in the Input UVLO and Startup section.

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