TPS53124 datasheet(4/22 Pages) TI

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ELECTRICAL CHARACTERISTICS

TPS53124

SLUS825B – FEBRUARY 2008 – REVISED MAY 2008 ..................................................................................................................................................... www.ti.com

over operating free-air temperature range, , VIN = 12 V, (unless otherwise noted)

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

Supply Current

VIN current, TA = 25°C, VREG5 tied to V5FLT,

IIN

VIN supply current

EN1 = EN2 = 5 V, VFB1 = VFB2 = 0.8 V, LL1 =

450

800

µA

LL2 = 0.5 V

IVINSDN

VIN shutdown current

VIN current, TA = 25°C, no load, EN1 = EN2 = 0 V

VFB Voltage and Discharge Resistance

Bandgap initial regulation

VBG

TA = 25°C

-1%

accuracy

TA = 25°C

755

765

775

VFB threshold voltage 　　　

VVFBTH

TA = -40°C to 85°C

752

778

IVFB

VFB input current

VFBx = 0.8 V, TA = 25°C

-0.01

+/-0.1

µA

RDISCHG

VO discharge resistance

ENx = 0 V, VOx = 0.5 V,TA = 25°C

Ω

VREG5 Output

VVREG5

VREG5 output voltage

TA = 25°C ,5.5 V < VIN < 24 V, 0 < IVREG5 < 10 mA

4.8

5.2

VLN5

　　　　Line regulation

5.5 V < VIN < 24 V, IVREG5 = 10 mA

VLD5

　　　　Load regulation

1 mA < IVREG5 < 10 mA

IVREG5

Output current

VIN = 5.5 V, VREG5 = 4.0 V, TA = 25°C

170

Output: N-Channel MOSFET Gate Drivers

Source, IDRVHx = -100 mA

5.5

RDRVH

DRVH resistance

Ω

Sink, IDRVHx = 100 mA

2.5

Source, IDRVLx = - 100 mA

RDRVL

DRVL resistance

Ω

Sink, IDRVLx = 100 mA

DRVHx-low to DRVLx-on

Dead time

DRVLx-low to DRVHx-on

Internal BST Diode

VFBST

Forward voltage

VVREG5-VBSTx, IF = 10 mA, TA = 25°C

0.7

0.8

0.9

IVBSTLK

VBST leakage current

VBST = 29 V, LL = 24 V, TA = 25°C

0.1

µA

ON-Time Timer Control

TON1

CH1 ON time

LL1 = 12 V, VO1 = 1.5 V

390

TON2

CH2 ON time

LL2 = 12 V, VO2 = 1.05 V

210

TON(min)

CH2 ON time

LL2 = 12 V, VO2 = 0.76 V

160

TOFF(min)

CH1/CH2 min OFF time

LL = 0.7 V TA = 25°C, VFB = 0.7 V

390

Soft Start

TSS

Internal SS time

Internal soft start VFB = 0.735 V

0.85

1.2

1.4

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