TPS54292 datasheet(3/35 Pages) TI1

Part #	TPS54292

Description	1.5-A/2.5-A Dual, Fully-Synchronous Buck Converter With Integrated MOSFET

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Manufacturer	TI1 [Texas Instruments]

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TPS54290, TPS54291, TPS54292

www.ti.com

SLUS973 – OCTOBER 2009

ELECTRICAL CHARACTERISTICS

TJ = –40°C to 125°C, PVDD1 and 2 = 12V (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

INPUT SUPPLY

PVDD1, PVDD2

Input voltage range

4.5

18

V

IDDSDN

Shutdown current

EN1=EN2 = PVDD2 (4.5-18V)

80

160

µA

IDDQ

Quiescent, non-switching

FB1 = FB2 = 1 V, Outputs Off

1.65

3.00

mA

IDDSW

Quiescent, while switching

FB1 = FB2 = 0.75V, measured at BP

10

mA

UVLO

Minimum turn-on voltage

PVDD2 only

3.8

4.1

4.4

V

UVLOHYS

Hysteresis

460

600

mV

Time from startup to soft start

CBP=10µF, EN1 and EN2 go low

tstart

(1) (2)

1.5

ms

begin

simultaneously

ENABLE (ACTIVE LOW)

Enable threshold voltage

0.9

1.2

1.5

V

V ENx

Hysteresis

70

mV

I ENx

Enable pull-up current

10

µA

Time from enable to soft-start

t ENx

(1)

Other enable pin = GND

10

µs

begin

BP REGULATOR

BP

Regulator voltage

8 V

≤ VPVDD2 ≤ 18 V

5.0

5.2

5.6

V

BPLDO

Dropout voltage

VPVDD2 = 4.5 V

400

mV

IBPS

Regulator short current

4.5 V

≤ VPVDD2 ≤ 18 V

25

mA

OSCILLATOR

TPS54290

260

300

360

kHz

fSW

Oscillator frequency

TPS54291

520

600

720

TPS54292

1040

1200

1440

kHz

tDEAD

(1)

Clock dead time

140

ns

gMTRANSCONDUCTANCE AMPLIFIER AND VOLTAGE REFERENCE (Applies to both channels)

0°C < TJ < 85°C

792

800

808

mV

VFB

Feedback input voltage

–40ºC < TJ < 125°C

786

800

812

mV

IFB

Feedback Input bias current

VFB=0.8 V

5

50

nA

gM

(1)

Transconductance

200

325

450

µS

Error amplifier source current

15

30

40

µA

ISOURCE

VFB1=VFB2=0.7 V, VCOMP=0 V

capability

Error amplifier sink current

ISINK

VFB1=VFB2=0.9 V, VCOMP=2 V

15

30

40

µA

capability

SOFT-START (Applies to both channels)

TPS54290 0 V

≤ VFB ≤ 0.8 V

4.0

5.2

6.0

tSS

Soft-start time

TPS54291

2.0

2.6

3.0

ms

TPS54292

1.0

1.3

1.6

OVERCURRENT PROTECTION

ICL1

Current limit CH1

1.8

2.2

2.6

A

ICL2

Current limit CH2

3.2

3.8

4.6

A

TPS54290

30

ms

THICCUP

(1)

Hiccup timeout

TPS54291

16

TPS54292

8

tONOC

(1)

Minimum overcurrent pulse

150

200

ns

(1)

Specified by design. Not tested in production.

(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. See Input UVLO and Startup.

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