TPS54317_15 datasheet(4/21 Pages) TI

Part #	TPS54317

Description	1.6 MHz, 3-V TO 6-V INPUT, 3-A SYNCHRONOUS STEP-DOWN SWIFT??CONVERTER

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Manufacturer	TI [Texas Instruments]

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TPS54317

SLVS619B – NOVEMBER 2005 – REVISED SEPTEMBER 2009 ..................................................................................................................................... www.ti.com

ELECTRICAL CHARACTERISTICS (continued)

TJ = –40°C to 125°C, VI = 3 V to 6 V (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

ERROR AMPLIFIER

Error amplifier open loop voltage gain

1 k

Ω COMP to AGND(4)

90

110

dB

Error amplifier unity gain bandwidth

Parallel 10 k

Ω, 160 pF COMP to AGND(4)

3

5

MHz

Error amplifier common-mode input

Powered by internal LDO(4)

0

VBIAS

V

voltage range

IIB

Input bias current, VSENSE

VSENSE = Vref

60

250

nA

Output voltage slew rate (symmetric),

VO

1

1.4

V/µs

COMP

PWM COMPARATOR

PWM comparator propagation delay

time, PWM comparator input to PH pin

10 mV overdrive(4)

70

85

ns

(excluding dead time)

SLOW-START/ENABLE

Enable threshold voltage, SS/ENA

0.82

1.2

1.4

V

Voltage to regulate using the internal

1.95

2.2

V

Vref, SS/ENA

Enable hysteresis voltage, SS/ENA (4)

0.03

V

Falling edge deglitch, SS/ENA (4)

2.5

µs

Internal slow-start time

2.6

3.35

4.1

ms

Charge current, SS/ENA

SS/ENA = 0 V

3

5

8

µA

Discharge current, SS/ENA

SS/ENA = 0.2 V, VI = 2.7 V

1.5

2.3

4

mA

POWER GOOD

Power good threshold voltage

VSENSE falling

90

%Vref

Power good hysteresis voltage (4)

3

%Vref

Power good falling edge deglitch (4)

35

µs

Output saturation voltage, PWRGD

I(sink) = 2.5 mA

0.18

0.3

V

Leakage current, PWRGD

VI = 5.5 V

1

µA

CURRENT LIMIT

VI = 3 V, output shorted

(4)

4

6.5

Current limit trip point

A

VI = 6 V, output shorted

(4)

4.5

7.5

Current limit leading edge blanking

100

ns

time(4)

Current limit total response time (4)

200

ns

THERMAL SHUTDOWN

Thermal shutdown trip point (4)

135

150

165

°C

Thermal shutdown hysteresis (4)

10

°C

OUTPUT POWER MOSFETS

VI = 6 V

59

88

m

Ω

rDS(on)

Power MOSFET switches

VI = 3 V

85

136

(4)

Specified by design

4

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