TPS53211

SLUSAA9A – SEPTEMBER 2011 – REVISED NOVEMBER 2012

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ELECTRICAL CHARACTERISTICS

(1)

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

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

INPUT SUPPLY

VCC supply voltage

Nominal input voltage range

4.5

12

V

VCC POR threshold

Ramp up; EN =’HI’

4.1

4.25

4.4

V

VCC POR hysteresis

VCCDR POR hysteresis

200

mV

Standby current

60

µA

Rds(on) of the boot strap switch

10

Ω

DRIVER SUPPLY

VCCDR Supply voltage

Nominal input voltage range

4.5

7.0

V

VCCDR POR threshold

Ramp up; EN =’HI’

3.15

3.32

3.50

V

VCCDR POR hysteresis

VCCDR POR hysteresis

220

mV

Standby current

100

µA

REFERENCE

VREF

Internal precision reference voltage

0.8

V

VREF tolerance

Close loop trim. 0°C

–0.5%

0.5%

ERROR AMPLIFIER

Unity gain bandwidth

14

MHz

Open loop gain

80

dB

FB Input leakage current

Sourced from FB pin

10

nA

Output sinking and sourcing current

2.5

mA

Slew rate

5

V/µs

ENABLE

EN logic high

2.2

V

EN logic low

600

mV

EN pin current

12

µA

SOFT START

Delay after EN asserting

EN = ‘HI’ to “switching enabled”

ms

PGOOD startup delay time

PG delay after soft-start begins

ms

RAMP

Ramp amplitude

2

V

PWM

(2)

Minimum ON time

40

ns

(2)

Maximum duty cycle

70%

SWITCHING FREQUENCY

Typical switching frequency

360

400

440

kHz

Minumum switching frequency

250

kHz

Maximum switching frequency

1

MHz

Switching frequency tolerance

–20%

20%

OVERCURRENT

CSP-CSN threshold for DCR

17

20

23

mV

sensing

(1)

See PS pin description for levels.

(2)

Ensured by design. Not production tested.

4

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