6

LM3555

SNVS594G – DECEMBER 2008 – REVISED APRIL 2016

www.ti.com

Product Folder Links: LM3555

Submit Documentation Feedback

Copyright © 2008–2016, Texas Instruments Incorporated

Electrical Characteristics (continued)

Unless otherwise specified: typical limits are for TA = 25°C; minimum and maximum limits apply over the full operating

ambient temperature range (

−30°C ≤ TA ≤ +85°C); VIN = 3.6 V.

(1)(2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

(3)

TA (minimum) = 0°C to account for self-heating. Current Limit specification uses VIN (maximum) = 4 V to account for the input voltage

range where current limit could be reached based upon the maximum application specifications for output voltage and diode current.

Operation above 4 V and up to 5.5 V is allowed and must not reach current limit.

ILIM

Peak current limit

2.7 V

≤ VIN ≤ 5.5 V

(3)

Current limit register

value = 00

1.183

1.250

1.55

A

Current limit register

value = 01

1.417

1.500

1.781

Current limit register

value = 10

1.512

1.750

2.025

Current limit register

value = 11

1.805

2

2.267

OSCILLATOR AND TIMING SPECIFICATIONS (NON-I2C INTERFACE TIMING)

ƒSW

Switching frequency

2.7 V

≤ VIN ≤ 5.5 V

1.91

(

−4.5%)

2

2.15

(7.5%)

MHz

tHW

Hardware flash timeout

Default timer

850

msec

tRU

Current ramp-up time

ILED = 0mA to ILED = fullscale,

VOUT = 6.5 V, VLED = 6.2 V

0.6

1

msec

tRD

Current ramp down time

ILED = fullscale to ILED = 0 mA

VOUT = 6.5 V, VLED = 6.2 V

0.2

0.5

msec

tTORCH-DG

Torch deglitching time

6.3

9

11.7

msec

CONTROL INTERFACE VOLTAGE SPECIFICATIONS

VI2C/EN

I2C/EN pin voltage

threshold

2.7 V

≤ VIN ≤ 5.5 V

Simple mode

0.54

V

I2C mode

1.26

VIL

Low-level threshold

voltage (SCL/EN1 and

SDA/EN2)

2.7 V

≤ VIN ≤ 5.5 V

0.54

V

VIH

High-level threshold

voltage (SCL/EN1 and

SDA/EN2)

2.7 V

≤ VIN ≤ 5.5 V

1.26

V

VOL

Low-level output

threshold limit

(SDA/EN2)

ILOAD = 3 mA

0.4

V