TPS40042DRCT datasheet(5/35 Pages) TI

Part #	TPS40042DRCT

Description	LOW PIN COUNT, LOW VIN (3.0 V TO 5.5 V) SYNCHRONOUS BUCK DC-TO-DC CONTROLLER WITH EXTERNAL REFERENCE INPUT

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TPS40042

SLUS777 – NOVEMBER 2007

ELECTRICAL CHARACTERISTICS (continued)

TJ = -40 °C to 85°C VVDD = 5 V, (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SOFT START/ENABLE

Calibration time before softstart

tCAL

(3)

1.0

1.6

2.5

begins

FB rise time from 0 V to VREFIN = 1.5

ms

tSS

(3)

Soft start time(4)

4.5

6.0

7.5

V

tREG

Time to voltage regulation

Sum of tCAL plus tSS ; VREFIN = 1.5 V

5.5

7.6

10

VEN

Enable threshold

EN voltage w.r.t. VVDD

-0.8

-1.2

-1.6

V

VENHYS

Enable hysteresis

50

mV

BOOTSTRAP

RBOOT3V3

VBOOT to VVDD, VVDD = 3.3 V

50

Bootstrap switch resistances

Ω

RBOOT5V

VBOOT to VVDD, VVDD = 5 V

30

OUTPUT DRIVER

VBOOT - VSW = 3.3 V, ISRCE = 100

RHDHI3V3

HDRV pull-up resistance

3.0

5.5

mA

RHDLO3V3

HDRV pull-down resistance

VBOOT - VSW = 3.3 V, ISINK = 100 mA

1.5

3

Ω

RLDHI3V3

LDRV pull-up resistance

VVDD = 3.3 V, ISOURCE = 100 mA

3.0

5.5

RLDLO3V3

LDRV pull-down resistance

VVDD = 3.3 V, ISINK = 100 mA

1.0

2.0

tRISE

(5)

LDRV, HDRV rise time

CLOAD = 1 nF

15

35

tFALL

(5)

LDRV, HDRV fall time

CLOAD = 1 nF

10

25

ns

TDEAD HL

Adaptive timing HDRV to LDRV

No load

15

30

45

TDEAD LH

Adaptive timing LDRV to HDRV

No load

5

15

35

SWITCH NODE

ILEAK

Leakage current

VEN = VVDD

-2

µA

THERMAL SHUTDOWN

tSD

(5)

Shutdown temperature

145

°C

Hysteresis

15

(3)

tCAL and tSS track with temperature and input voltage

(4)

Soft start time is a function of VREFIN. See Applications section for further detail.

(5)

Ensured by design. Not production tested.

5

Product Folder Link(s): TPS40042

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