LM3555TLE datasheet(5/33 Pages) TI

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LM3555

www.ti.com

SNVS594E – JANUARY 2009 – REVISED NOVEMBER 2011

Electrical Characteristics

Limits in standard typeface are for TA = +25°C. Limits in boldface type apply over the full operating ambient temperature

range (

−30°C ≤ TA ≤ +85°C). Unless otherwise specified: VIN = 3.6V.

(1) (2)

Symbol

Parameter

Conditions

Min

Typ

Max

Units

CURRENT AND VOLTAGE SPECIFICATIONS

50.7

67.2

(-15.5%)

(+12%)

69.8

86.4

2.7V

≤ VIN ≤ 5.5V

(-12.8%)

(+8.0%)

ILED-OUT

Flash LED Accuracy

VOUT = 6.5V,

(%)

304

336

VLED = 6.2V

320

(-5%)

(+5%)

475

535

500

(-5%)

(+7%)

(-20.4%)

2.5 mA

(+33.6%)

(-20.4%)

5.0mA

(+33.8%)

Indicator LED Current

2.7V

≤ VIN ≤ 5.5V

IIND-OUT

Accuracy

VIND = 2.0V (Indicator Mode)

(-20.3%)

7.5mA

(+33.7%)

(-20.2%)

10.0mA

(+33.4%)

Current Source

VCSH

2.7V

≤ VIN ≤ 5.5V

300

350

Headroom Voltage

Trip Point (Rising)

9.22

9.5

9.96

Over-Voltage Protection

VOVP

2.7V

≤ VIN ≤ 5.5V

Range

Hysteresis

0.4

Upper Range

8.5

VOUT

Output Voltage Range

(VLED x NLED) + VCSH

Lower Range

2.8

ISD

Shutdown Current

2.7V

≤ VIN ≤ 5.5V

0.75

µA

ISB

Standby Current

2.7V

≤ VIN ≤ 5.5V

1.1

4.3

µA

Operating Quiescent

2.7V

≤ VIN ≤ 5.5V

3.5

Current

Part Switching

Reference Voltage for

VREF

VIN = 3.6V (No Offset)

4.35

LED Detection

IND OVP

2.571

VIND

Indicator Fault Voltages

IND Short

0.842

UVLO

Under-Voltage Lock Out

Falling VIN

2.35

2.4

2.43

UVLOHYST UVLO Hysteresis

Rising VIN

Current Limit Register

1.183

1.250

1.550

value = 00

Current Limit Register

1.417

1.500

1.781

value = 01

2.7V

≤ VIN ≤ 5.5V

ILIM

Peak Current Limit

(3)

Current Limit Register

1.512

1.750

2.025

value = 10

Current Limit Register

1.805

2.000

2.267

value = 11

OSCILLATOR AND TIMING SPECIFICATIONS (NON-I2C INTERFACE TIMING)

1.91

2.15

fSW

Switching Frequency

2.7V

≤ VIN ≤ 5.5V

2.0

MHz

(

−4.5%)

(+7.5%)

tHW

Hardware Flash Timeout

Default Timer

850

msec

ILED = 0mA to ILED = Fullscale,

tRU

Current Ramp-Up Time

0.6

1.0

msec

VOUT = 6.5V, VLED = 6.2V

Current Ramp Down

ILED = Fullscale to ILED = 0 mA

tRD

0.2

0.5

msec

Time

VOUT = 6.5V, VLED = 6.2V

tTORCH-DG

Torch Deglitching Time

6.3

11.7

msec

(1)

Min and Max limits are guaranteed by design, test, or statistical analysis. Typical (Typ) numbers are not guaranteed, but do represent

the most likely norm. Unless otherwise specified, conditions for Typical specifications are: VIN = 3.6V and TA = 25°C.

(2)

Switching disabled.

(3)

TA (min) = 0°C to account for self-heating. Current Limit specification uses VIN (Max) = 4.0V 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

4.0V and up to 5.5V is allowed and should not reach current limit.

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