TPS2521 datasheet(9/47 Pages) TI

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7.6 Timing Requirements

PARAMETER

TEST CONDITIONS

MIN

TYP MAX

UNIT

tOVC

Overvoltage clamp response time

VIN > VOVC to VOUT↓

µs

tLIM

Current limit response time

IOUT > 1.2 x ILIM & ITIMER expired to IOUT

settling to within 5 % of ILIM

400

µs

tSC

Scalable fast-trip response time

IOUT > 3 x ILIM to IOUT↓

500

tFT

Fixed fast-trip response time

IOUT > IFT to IOUT↓

500

tRST

Auto-Retry Interval after fault (TPS25210A)

110

tSWRCB

Reverse Current Blocking recovery time

(VIN - VOUT) > VFWDTH to VOUT ↑

µs

tRCB

Reverse Current Blocking comparator

response time

(VOUT - VIN) > 1.3 x VREVTH to BFET OFF

µs

tPGA

PG Assertion de-glitch

µs

tPGD

PG De-assertion de-glitch

µs

7.7 Switching Characteristics

The output rising slew rate is internally controlled and constant across the entire operating voltage range to ensure the

turn on timing is not affected by the load conditions. The rising slew rate can be adjusted by adding capacitance from

the dVdt pin to ground. As CdVdt is increased it will slow the rising slew rate (SR). See Slew Rate and Inrush Current

Control (dVdt) section for more details. The Turn-Off Delay and Fall Time, however, are dependent on the RC time constant

of the load capacitance (COUT) and Load Resistance (RL). The Switching Characteristics are only valid for the power-up

sequence where the supply is available in steady state condition and the load voltage is completely discharged before the

device is enabled.Typical Values are taken at TJ = 25°C unless specifically noted otherwise. VIN = 2.7 V, RL = 100 Ω, COUT =

1 µF

PARAMETER

CdVdt = Open

CdVdt = 1800 pF

CdVdt = 3300

UNIT

SRON

Output Rising slew rate

12.14

0.87

0.5

V/ms

tD,ON

Turn on delay

0.09

0.6

0.97

Rise time

0.17

2.51

4.33

tON

Turn on time

0.27

3.11

5.31

tD,OFF

Turn off delay

64.44

µs

EN/UVLO

VEN/UVLO

Time

VUVLO(R)

OUT

VIN

10%

90%

tD,OFF

tON

SRON

tD,ON

VUVLO(F)

Figure 7-1. TPS2521xx Switching Times

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TPS2521

SLVSFX8 – MARCH 2021

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