TPS54341_15 datasheet(5/48 Pages) TI

5 / 48 page

TPS54341

www.ti.com

SLVSC61 – NOVEMBER 2013

ELECTRICAL CHARACTERISTICS

TJ = –40°C to 150°C, VIN = 4.5 to 42 V (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

SUPPLY VOLTAGE (VIN PIN)

Operating input voltage

4.5

Internal undervoltage lockout

Rising

4.1

4.3

4.48

threshold

Internal undervoltage lockout

325

threshold hysteresis

Shutdown supply current

EN = 0 V, 25°C, 4.5 V

≤ VIN ≤ 42 V

2.25

4.5

μA

Operating: nonswitching supply

FB = 0.9 V, TA = 25°C

152

200

current

ENABLE AND UVLO (EN PIN)

Enable threshold voltage

No voltage hysteresis, rising and falling

1.1

1.2

1.3

Enable threshold +50 mV

–4.6

Input current

μA

Enable threshold –50 mV

–0.58

–1.2

–1.8

Hysteresis current

–2.2

–3.4

–4.5

μA

Enable to COMP active

VIN = 12 V, TA = 25°C

540

µs

VOLTAGE REFERENCE

Voltage reference

0.792

0.8

0.808

HIGH-SIDE MOSFET

On-resistance

VIN = 12 V, BOOT-SW = 6 V

185

ERROR AMPLIFIER

Input current

Error amplifier transconductance

–2

μA < ICOMP < 2 μA, VCOMP = 1 V

350

μMhos

(gm)

Error amplifier transconductance

–2

μA < ICOMP < 2 μA, VCOMP = 1 V, VFB = 0.4 V

μMhos

(gm) during soft-start

Error amplifier DC gain

VFB = 0.8 V

10 000

V/V

Min unity gain bandwidth

2500

kHz

Error amplifier source and sink

V(COMP) = 1 V, 100-mV overdrive

±30

μA

COMP to SW current

A/V

transconductance

CURRENT LIMIT

All VIN and temperatures, Open Loop(1)

4.5

5.5

6.8

Current limit threshold

All temperatures, VIN = 12 V, Open Loop (1)

4.5

5.5

6.3

VIN = 12 V, TA = 25°C, Open Loop

(1)

5.2

5.5

5.9

Current limit threshold delay

THERMAL SHUTDOWN

Thermal shutdown

176

°C

Thermal shutdown hysteresis

°C

TIMING RESISTOR AND EXTERNAL CLOCK (RT/CLK PIN)

Switching frequency range using RT

100

2500

kHz

mode

ƒSW

Switching frequency

RT = 200 kΩ

450

500

550

kHz

Switching frequency range using CLK

160

2300

kHz

mode

Minimum CLK input pulse width

RT/CLK high threshold

1.55

RT/CLK low threshold

0.5

1.2

RT/CLK falling edge to SW rising

Measured at 500 kHz with RT resistor in series

edge delay

PLL lock in time

Measured at 500 kHz

μs

SOFT START AND TRACKING (SS/TR PIN)

Charge current

VSS/TR = 0.4 V

1.7

µA

(1)

Open Loop current limit measured directly at the SW pin and is independent of the inductor value and slope compensation.

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