IRF7821 datasheet(4/33 Pages) TI

4 / 33 page

TPS51123

SLUS890 – DECEMBER 2008 ........................................................................................................................................................................................... www.ti.com

ELECTRICAL CHARACTERISTICS (continued)

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

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNIT

OUTPUT DRIVERS

Source, VBSTx - DRVHx = 100 mV

RDRVH

DRVH resistance

Sink, VDRVHx - LLx = 100 mV

1.5

Ω

Source, VVREG5 - DRVLx = 100 mV

RDRVL

DRVL resistance

Sink, VDRVLx = 100 mV

1.5

DRVHx-off to DRVLx-on

Dead time

DRVLx-off 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

VBSTx = 34 V, LLx = 28 V, TA = 25 °C

0.1

µA

DUTY AND FREQUENCY CONTROL

TON11

CH1 on time 1

VIN = 12 V, VO1 = 5 V, 200 kHz setting

2080

TON12

CH1 on time 2

VIN = 12 V, VO1 = 5 V, 245 kHz setting

1700

TON13

CH1 on time 3

VIN = 12 V, VO1 = 5 V, 300 kHz setting

1390

TON14

CH1 on time 4

VIN = 12 V, VO1 = 5 V, 365 kHz setting

1140

TON21

CH2 on time 1

VIN = 12 V, VO2 = 3.3 V, 250 kHz setting

1100

TON22

CH2 on time 2

VIN = 12 V, VO2 = 3.3 V, 305 kHz setting

900

TON23

CH2 on time 3

VIN = 12 V, VO2 = 3.3 V, 375 kHz setting

730

TON24

CH2 on time 4

VIN = 12 V, VO2 = 3.3 V, 460 kHz setting

600

TON(min)

Minimum on time

TA = 25 °C

TOFF(min)

Minimum off time

TA = 25 °C

300

SOFTSTART

TSS

Internal SS time

Internal soft start

1.1

1.6

2.1

POWERGOOD

PG in from lower

92.50%

95%

97.50%

VTHPG

PG threshold

PG in from higher

102.50%

105%

107.50%

PG hysteresis

2.50%

7.50%

IPGMAX

PG sink current

PGOOD = 0.5 V

TPGDEL

PG delay

Delay for PG in

350

510

670

µs

LOGIC THRESHOLD AND SETTING CONDITIONS

Shutdown

0.4

VEN0

EN0 setting voltage

Enable

2.4

IEN0

EN0 current

VEN0 = 0.2 V

3.5

µA

Shutdown

0.6

VENC

ENC threshold voltage

Enable

200 kHz/250 kHz

1.5

245 kHz/305 kHz

1.9

2.1

VTONSEL

TONSEL setting voltage

300 kHz/375 kHz

2.7

3.6

365 kHz/460 kHz

4.7

Auto skip

1.5

VSKIPSEL

SKIPSEL setting voltage

PWM only

1.9

2.1

OOA auto skip

2.7

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