SLMA002 datasheet(4/46 Pages) TI1

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ELECTRICAL CHARACTERISTICS

TPS55383

,, TPS55386

SLUS818 – SEPTEMBER 2008 ......................................................................................................................................................................................... www.ti.com

–40°C

≤ TJ ≤ +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 = 0.9 V, 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

600

CBP = 10 µF, EN1 and EN2 go low

tSTART

(1) (2)

Time from startup to softstart begin

simultaneously

ENABLE (EN)

VEN1, VEN2

Enable threshold

0.9

1.2

1.5

Enable threshold hysteresis(1)

IEN1. IEN2

Enable pull-up current

VEN1 = VEN2 = 0 V

µA

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

550

IBP

(1)

Regulator external load

IBPS

Regulator short circuit

4.5 V < PVDD2 < 28 V

OSCILLATOR

TPS55383

255

310

375

fSW

Switching frequency

kHz

TPS55386

510

630

750

tDEAD

(1)

Clock dead time

140

ERROR AMPLIFIER (EA) and VOLTAGE REFERENCE (REF)

0°C < TJ < +85°C

786

800

812

VFB1, VFB2

Feedback input voltage

–40°C < TJ < +125°C

784

812

IFB1, IFB2

Feedback input bias current

gM1, gM2

(1)

Error Amplifier transconductance

220

315

420

µS

fp1, fp2

(1)

Error Amplifier dominant pole frequency

kHz

ISINK(COMP1),

Error Amplifier sink current capability

VFB1 = VFB2 = 0.9V, VCOMP = 2 V

µA

ISINK(COMP2)

ISRC(COMP1),

Error Amplifier source current capability

VFB1 = VFB2 = 0.7V, VCOMP = 0 V

µA

ISRC(COMP2)

SOFT START (SS)

TSS1, TSS2

Soft start time

1.5

2.1

2.7

(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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