FDMS8680 datasheet(4/27 Pages) TI1

4 / 27 page

TPS51218

SLUS935B

– MAY 2009 – REVISED FEBRUARY 2012

www.ti.com

ELECTRICAL CHARACTERISTICS

over recommended free-air temperature range, V5IN=5V. (Unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY CURRENT

V5IN current, TA = 25°C, No Load,

IV5IN

V5IN supply current

320

500

μA

VEN = 5 V, VVFB = 0.735 V

IV5INSDN

V5IN shutdown current

V5IN current, TA = 25°C, No Load, VEN = 0 V

μA

INTERNAL REFERENCE VOLTAGE

VFB voltage, CCM condition(1)

0.7000

TA = 25°C, skip mode

0.7005

0.7040

0.7075

VVFB

VFB regulation voltage

TA = 0°C to 85°C, skip mode

0.6984

0.7040

0.7096

TA = –40°C to 85°C, skip mode

0.6970

0.7040

0.7110

IVFB

VFB input current

VVFB = 0.735 V, TA = 25°C, skip mode

0.01

0.2

μA

OUTPUT DISCHARGE

Output discharge current from

IDischg

VEN = 0 V, VSW = 0.5 V

SW pin

OUTPUT DRIVERS

Source, IDRVH = –50 mA

1.5

RDRVH

DRVH resistance

Sink, IDRVH = 50 mA

0.7

1.8

Ω

Source, IDRVL = –50 mA

1.0

2.2

RDRVL

DRVL resistance

Sink, IDRVL = 50 mA

0.5

1.2

DRVH-off to DRVL-on

Dead time

DRVL-off to DRVH-on

BOOT STRAP SWITCH

VFBST

Forward voltage

VV5IN-VBST, IF = 10 mA, TA = 25°C

0.1

0.2

IVBSTLK

VBST leakage current

VVBST = 34.5 V, VSW = 28 V, TA = 25°C

0.01

1.5

μA

DUTY AND FREQUENCY CONTROL

tOFF(min)

Minimum off-time

TA = 25°C

150

260

400

VIN = 28 V, VOUT = 0.7 V, RRF = 39kΩ,

tON(min)

Minimum on-time

TA = 25°C

(1)

SOFTSTART

tss

Internal SS time

From VEN = high to VOUT = 95%

POWERGOOD

PG in from lower

92.5%

95%

97.5%

VTHPG

PG threshold

PG in from higher

107.5%

110%

112.5%

PG hysteresis

2.5%

7.5%

IPGMAX

PG sink current

VPGOOD = 0.5 V

tPGDEL

PG delay

Delay for PG in

0.8

1.2

LOGIC THRESHOLD AND SETTING CONDITIONS

Enable

1.8

VEN

EN voltage threshold

Disable

0.5

IEN

EN input current

VEN = 5V

1.0

μA

RRF = 470 kΩ, TA = 25°C

(2)

266

290

314

RRF = 200 kΩ, TA = 25°C

(2)

312

340

368

fSW

Switching frequency

kHz

RRF = 100 kΩ, TA = 25°C

(2)

349

380

411

RRF = 39 kΩ, TA = 25°C

(2)

395

430

465

CCM

1.8

VRF

CCM setting voltage

Auto-skip

0.5

(1)

Ensured by design. Not production tested.

(2)

Not production tested. Test condition is VIN= 8 V, VOUT= 1.1 V, IOUT = 10 A using application circuit shown in Figure 21.

Submit Documentation Feedback

Product Folder Link(s): TPS51218

FDMS8680 Datasheet(PDF) 4 Page - Texas Instruments

FDMS8680 Datasheet(HTML) 4 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

Datasheet Download

Link URL