LM3556 datasheet(6/31 Pages) TI1

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LM3556

SNVS796C – AUGUST 2011 – REVISED APRIL 2013

www.ti.com

ELECTRICAL CHARACTERISTICS

(1) (2)

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

range (

−40°C ≤ TA ≤ +85°C). Unless otherwise specified, VIN = 3.6V.

Symbol

Parameter

Conditions

Min

Typ

Max

Units

Current Source Specifications

1.425

1.575

1.5A Flash, VOUT = 4V

1.5

(-5%)

(+5%)

ILED

Current Source Accuracy

42.3

51.7

46.88 mA Torch, VOUT = 3.6V

(

−10%)

(+10%)

280

ILED = 1.5A

Flash

250

(+12%)

VHR

Current Source Regulation Voltage

172.5

ILED = 46.88 mA

Torch

150

(+15%)

ON Threshold

4.86

5.1

Output Over-Voltage Protection Trip

VOVP

Point

OFF Threshold

4.75

4.88

4.99

Step-Up DC/DC Converter Specifications

RPMOS

PMOS Switch On-Resistance

IPMOS = 1A

Ω

RNMOS

NMOS Switch On-Resistance

INMOS = 1A

−12%

1.7

+12%

−12%

1.9

+12%

ICL

Switch Current Limit

−10%

2.5

+10%

−12%

3.1

+12%

VTRIP

NTC Comparator Trip Threshold

Configuration Register, bit [1] = 1

−6%

600

+6%

UVLO

Under Voltage Lockout Threshold

Falling VIN

2.74

2.8

2.85

INTC

NTC Current

−6%

+6%

µA

Input Voltage Flash Monitor trip

VIVFM

-3.2%

2.9

+3.2%

threshold

fSW

Switching Frequency

2.5V

≤ VIN ≤ 5.5V

3.72

4.28

MHz

Quiescent Supply Current

Device Not Switching Pass Mode

0.6

0.75

Device Disabled, EN = 0V

ISD

Shutdown Supply Current

0.1

1.3

µA

2.5V

≤ VIN ≤ 5.5V

Device Disabled, EN = 2V

ISB

Standby Supply Current

2.5

µA

2.5V

≤ VIN ≤ 5.5V

Flash-to-Torch LED Current Settling

TX Low to High,

tTX

µs

Time

ILED = 1.5A to 46.88 mA

ILED Overshoot in External

IOS

0 mA to ITORCH

Indicator Mode

ENABLE, STROBE, TORCH, TX Voltage Specifications

VIL

Input Logic Low

0.4

2.5V

≤ VIN ≤ 5.5V

VIH

Input Logic High

1.2

VIN

I2C-Compatible Interface Specifications (SCL, SDA)

VIL

Input Logic Low

0.4

2.5V

≤ VIN ≤ 4.2V

VIH

Input Logic High

1.2

VIN

VOL

Output Logic Low

ILOAD = 3 mA

400

SCL Clock Frequency

2.4

µs

Data In Setup Time to SCL High

100

Data Out Stable After SCL Low

SDA Low Setup Time to SCL Low

100

(Start)

SDA High Hold Time After SCL

100

High (Stop)

(1)

All voltages are with respect to the potential at the GND pin.

(2)

Min and Max limits are specified by design, test, or statistical analysis. Typical (typ.) numbers are not verified, but do represent the most

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

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