TPS51124_15 datasheet(5/28 Pages) TI

Part #	TPS51124

Description	TPS51124 Dual Synchronous Step-Down Controller for Low-Voltage Power Rails

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Manufacturer	TI [Texas Instruments]

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TPS51124

www.ti.com

SLVS616C – NOVEMBER 2005 – REVISED DECEMBER 2014

6.4

Electrical Characteristics

over operating free-air temperature range, V5IN = V5FILT = 5 V (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY CURRENT

V5FILT current, no load,

IV5FILT

V5FILT supply current

EN1 = EN2 = 5 V, VFB1 = VFB2 = 0.77 V,

350

700

μA

LL1=LL2=0.5V

IV5INSDN

V5IN shutdown current

V5IN current, no load, EN1 = EN2 = 0 V

1

μA

IV5FILTSD

V5FILT shutdown current

V5FILT current, no load, EN1 = EN2 = 0 V

1

μA

N

VFB VOLTAGE and DISCHARGE RESISTANCE

VVFB

VFB regulation voltage

FB voltage, skip mode (fPWM/10)

764

mV

TA = 25°C, bandgap initial accuracy

–0.9%

0.9%

VFB regulation voltage

VVFB

TA = 0°C to 85°C

(1)

–1.3%

1.3%

tolerance

TA = –40°C to 85°C

(1)

–1.6%

1.6%

VFB regulation shift in

0.758-V target for resistor divider. See PWM Operation of

VVFBSKIP

758

mV

continuous conduction

Detailed Description(1)

IVFB

VFB input current

VFBx = 0.758 V, absolute value

0.02

0.1

μA

RDischg

VO discharge resistance

ENx = 0 V, VOx = 0.5 V, TA = 25°C

10

20

Ω

OUTPUT: N-CHANEEL MOSFET GATE DRIVERS

Source, VVBSTx–DRVHx = 0.5 V

5

7

Ω

RDRVH

DRVH resistance

Sink, VDRVHx-LLx= 0.5 V

1.5

2.5

Ω

Source, VV5IN–DRVLx = 0.5 V

4

6

Ω

RDRVL

DRVL resistance

Sink, VDRVLx–PGNDx = 0.5 V

1

2.0

Ω

DRVHx-low (DRVHx = 1 V) to DRVLx-on

10

20

50

ns

(DRVLx = 4 V), LL = –0.05 V,

TD

Dead time

DRVLx-low (DRVLx = 1 V) to DRVHx-on

30

40

60

ns

(DRVHx = 4 V), LL = –0.05 V,

INTERNAL BST DIODE

VFBST

Forward voltage

VV5IN–VBSTx, IF = 10 mA, TA = 25°C

0.7

0.8

0.9

V

VBST = 34 V, LL = 28 V, VOx = 5.5 V,

IVBSTLK

VBST leakage current

0.1

1

μA

TA = 25°C

ON-TIME TIMER CONTROL AND INTERNAL SOFT START,

TON11

CH1, 240-kHz setting

VO1 = 1.5 V,TONSEL = GND, LL1 = 12 V

440

500

560

ns

TON12

CH1, 300-kHz setting

VO1 = 1.5 V, TONSEL = FLOAT, LL1 = 12 V

340

390

440

ns

TON13

CH1, 360-kHz setting

VO1 = 1.5 V,TONSEL = V5FILT, LL1 = 12 V

265

305

345

ns

TON21

CH2, 300-kHz setting

VO2 = 1.05 V, TONSEL = GND, LL2 = 12 V

235

270

305

ns

TON22

CH2, 360-kHz setting

VO2 = 1.05 V, TONSEL = FLOAT, LL2 = 12 V

180

210

240

ns

TON23

CH2, 420-kHz setting

VO2 = 1.05 V, TONSEL = V5FILT, LL2 = 12 V

120

150

180

ns

TON(MIN)

CH2 On time

VO2 = 0.76 V, TONSEL = V5FILT, LL2 = 28 V

80

110

140

ns

TOFF(MIN) CH1/CH2 Min. off time

LL = –0.1 V, TA= 25°C, VFB = 0.7 V

435

ns

Internal soft start, time from ENx > 3 V to VFBx regulation value =

Tss

Internal SS time

0.85

1.2

1.40

ms

735 mV

UVLO/LOGIC THRESHOLD

Wake up

3.7

4.0

4.3

VUV5VFILT V5FILT UVLO threshold

V

Hysteresis

0.2

0.3

0.4

Wake up

1.0

1.3

1.5

VEN

ENx threshold

V

Hysteresis

0.2

IEN

ENx input current

Absolute value(2)

0.02

0.1

μA

(1)

Specified by design. Not production tested.

(2)

Ensured by design. Not production tested.

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