LM3532_13 datasheet(4/47 Pages) TI1

No de pièce	LM3532

Description	LM3532 High Efficiency White LED Driver with Programmable Ambient Light Sensing Capability and I2C-Compatible Interface

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Fabricant	TI1 [Texas Instruments]

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LM3532

SNVS653D – JULY 2011 – REVISED JUNE 2013

www.ti.com

ELECTRICAL CHARACTERISTICS

(1) (2)

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

range (

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

Symbol

Parameter

Conditions

Min

Typ

Max

Units

2.7V

≤ VIN ≤ 5.5V, ControlX Full-Scale

Output Current Regulation Accuracy

ILED(1/2/3)

Current Register = 0xF3, Brightness

18.68

20.2

21.8

mA

(ILED1, ILED2 or ILED3)

Code = 0xFF

2.7V

≤ VIN ≤ 5.5V, IFULL_SCALE =

IMATCH

(3), (4)

ILED2 to ILED3 Current Matching

−2

0.3

2

%

20.2mA, Brightness Code = 0xFF

Regulated Current Sink Headroom

VREG_CS

400

mV

Voltage

Current Sink Minimum Headroom

ILED = 95% of nominal, ILED = 20.2

VHR

200

240

mV

Voltage

mA

RDSON

NMOS Switch On Resistance

ISW = 100 mA

0.25

Ω

ICL

NMOS Switch Current Limit

2.7V

≤ VIN ≤ 5.5V

880

1000

1120

mA

ON Threshold, 2.7V

≤ VIN ≤ 5.5V

40

41

42

VOVP

Output Over-Voltage Protection

V

Hysteresis

1

fSW

Switching Frequency

2.7V

≤ VIN ≤ 5.5V

450

500

550

kHz

DMAX

Maximum Duty Cycle

94

%

DMIN

Minimum Duty Cycle

10

%

Quiescent Current into IN, Device

ILED1 = ILED2 = ILED3 = 20.2 mA,

IQ

490

µA

Not Switching

feedback disabled.

ILED1 = ILED2 = ILED3 = 20.2 mA, VOUT

IQ_SW

Switching Supply Current

1.35

mA

= 32V

ISHDN

Shutdown Current

2.7V

≤ VIN ≤ 5.5V, HWEN = GND

1

2

µA

Full-Scale Current =20.2 mA

Minimum LED Current in ILED1,

ILED_MIN

Brightness code = 0x01, Mapping =

9.5

µA

ILED2 or ILED3

Exponential

Thermal Shutdown

+140

TSD

°C

Hysteresis

15

LOGIC INPUTS/OUTPUTS (PWM1, PWM2, HWEN, SCL, SDA, INT)

VIL

Input Logic Low

2.7V

≤ VIN ≤ 5.5V

0

0.4

V

VIH

Input Logic High

2.7V

≤ VIN ≤ 5.5V

1.2

VIN

VOL

Output Logic Low (SCL, INT)

2.7V

≤ VIN ≤ 5.5V, ILOAD = 3mA

0.4

V

PWM Input Internal Pulldown

RPWM

100

k

Ω

Resistance (PWM1, PWM2)

I2C-COMPATIBLE TIMING SPECIFICATIONS (SCL, SDA, )(5)

t1

SCL (Clock Period)

2.5

µs

t2

Data In Setup Time to SCL High

100

ns

t3

Data Out Stable After SCL Low

0

ns

SDA Low Setup Time to SCL Low

t4

100

ns

(Start)

SDA High Hold Time After SCL High

t5

100

ns

(Stop)

AMBIENT LIGHT SENSOR INPUTS (ALS1, ALS2)

ALS1, ALS2 Resistor Select Register

RALS1, RALS2

ALS Pin Internal Pulldown Resistors

= 0x0F,

2.29

2.44

2.59

k

Ω

2.7V

≤ VIN ≤ 5.5V

(1)

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

(2)

Min and Max limits are verified by design, test, or statistical analysis. Typical 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.

(3)

All Current sinks for the matching spec are assigned to the same Control Bank.

(4)

LED current sink matching between ILED2 and ILED3 is given by taking the difference between either (ILED2 or ILED3) and the

average current between the two, and dividing by the average current between the two (ILED2/3 – ILED(AVE))/ILED(AVE). This

simplifies to (ILED2 – ILED3)/(ILED2 + ILED3). In this test, both ILED2 and ILED3 are assigned to Bank A.

(5)

SCL and SDA must be glitch-free in order for proper brightness control to be realized.

4

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