TPS54386-Q1

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SLUSAZ9A – MARCH 2012 – REVISED MARCH 2012

ELECTRICAL CHARACTERISTICS

–40°C

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

INPUT SUPPLY (PVDD)

4.5

28

V

Input voltage range

4.5

28

V

Shutdown

70

150

μA

Quiescent, non-switching

1.8

3

mA

SW node unloaded; Measured as BP sink

Quiescent, while-switching

5

current

Minimum turnon voltage

PVDD2 only

3.8

4.1

4.4

V

Hysteresis

400

mV

(1) (2)

Time from start-up to soft-start begin

2

ms

simultaneously

ENABLE (EN)

0.9

1.2

1.5

V

Enable threshold

0.9

1.2

1.5

V

Hysteresis

50

mV

6

12

μA

Enable pullup current

6

12

μA

(1)

Time from enable to soft-start begin

Other EN pin = GND

10

μs

BP REGULATOR (BP)

BP

Regulator voltage

5

5.25

5.6

V

Dropout voltage

400

mV

BP

(1)

Regulator external load

2

mA

Regulator short circuit

10

20

30

mA

OSCILLATOR

Switching frequency

510

630

750

kHz

(1)

Clock dead time

140

ns

ERROR AMPLIFIER (EA) and VOLTAGE REFERENCE (REF)

788

800

812

mV

Feedback input voltage

786

812

mV

3

50

nA

Feedback input bias current

3

50

nA

(1)

30

μS

Transconductance

(1)

30

μS

SOFT START (SS)

1.5

2.1

2.7

ms

Soft-start time

1.5

2.1

2.7

ms

OVERCURRENT PROTECTION

Current limit channel 1

3.6

4.5

5.6

A

3.6

4.5

5.6

Current limit channel 2

2.4

3

3.6

A

1.15

1.5

1.75

670

mV

Low-level output threshold to declare a fault

Measured at feedback pin

670

mV

(1)

Hiccup timeout

10

ms

(1)

90

150

ns

Minimum overcurrent pulse duration

(1)

90

150

ns

(1)

Ensured by design. Not production tested.

(2)

When both outputs are started simultaneously, a 20-mA current source charges the BP capacitor. Faster times are possible with a lower

BP capacitor value. More information can be found in the Input UVLO and Startup section.

Copyright © 2012, Texas Instruments Incorporated

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