LM3632AYFFR datasheet(5/64 Pages) TI1

Teilenummer	LM3632AYFFR

Bauteilbeschribung	Single-Chip Backlight With Bias Power and 1.5-A Flash LED Driver

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Hersteller	TI1 [Texas Instruments]

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LM3632A

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SNVSA63A – APRIL 2015 – REVISED SEPTEMBER 2015

6.5 Electrical Characteristics

Unless otherwise specified, limits apply over the full operating ambient temperature range (

−40°C ≤ TA ≤ 85°C), VIN = 3.7 V,

VVPOS = 5.5 V, VVNEG = –5.4 V, VLCM_OUT = 6 V.

PARAMETER

TEST CONDITION

MIN

TYP

MAX

UNIT

CURRENT CONSUMPTION

ISD

Shutdown current

EN = 0

1

4

µA

Quiescent current, device not

IQ

EN = VIN, LCD bias boost disabled

2

10

µA

switching

ILCD_EN

LCD bias boost enabled, no-load

0.5

mA

DEVICE PROTECTION

TSD

Thermal shutdown

140

°C

BACKLIGHT LED CURRENT SINKS

Maximum output current in

2.7 V

≤ VIN ≤ 5 V, linear or exponential

mA

ILED_MAX

25

BLED1/2

mode

Minimum output current in

2.7 V

≤ VIN ≤ 5 V, linear or exponential

µA

ILED_MIN

50

BLED1/2

mode

2.7 V

≤ VIN ≤ 5 V, 50 µA ≤ ILED ≤ 25

IACCU

LED current accuracy(1)

-3%

0.1%

3%

mA, linear or exponential mode

LED1 to LED2 current

2.7 V

≤ VIN ≤ 5 V, 300 µA ≤ ILED ≤ 25

IMATCH

-2%

0.1%

2%

matching(1)

mA, linear or exponential mode

BACKLIGHT BOOST CONVERTER

Backlight boost output

VOVP_BL

2.7 V

≤ VIN ≤ 5 V, 29 V option

28

28.75

29.5

V

overvoltage protection

ILED = 5 mA/string, VIN = 3.7 V

Efficiency

Typical efficiency(2)

87%

(2 x 7 LEDs), (POUT/PIN)

ILED = 25 mA

250

mV

Regulated current sink

VHR

headroom voltage

ILED = 5 mA

100

mV

VHR_MIN

Current sink minimum headroom

ILED = 95% of nominal, ILED = 5 mA

30

mV

voltage

RDSON

NMOS switch on resistance

ISW = 100 mA

0.25

Ω

ICL

NMOS switch current limit

2.7 V

≤ VIN ≤ 5 V

900

1000

1100

mA

ƒSW_BLBOOST

2.7 V

≤ VIN ≤ 5 V

500-kHz mode

450

500

550

Switching frequency

kHz

1-MHz mode

900

1000

1100

DMAX

Maximum duty cycle

94%

LCM BIAS BOOST CONVERTER

LCM bias boost output

2.7 V

≤ VIN ≤ 5 V

VOVP_LCM

7

V

overvoltage protection

ƒSW_LCMBST

Switching frequency (3)

2.7 V

≤ VIN ≤ 5 V

2500

kHz

Bias boost output voltage range

4.5

6.4

V

Output voltage step size

50

mV

Peak-to-peak ripple voltage (3)

ILOAD = 5 mA & 50 mA, CBST = 10 µF

50

mVpp

VIN + 500 mVp-p AC square wave, Tr =

VLCM_OUT

LCM_OUT line transient

100 mV/µs, 200 Hz, 12.5 % duty, ILOAD

–50

±25

50

mV

response (3)

= 5 mA, CIN = 10 µF

LCM_OUT load transient

Load current step 0 mA to 100 mA,

–150

150

mV

response (3)

TRISE/FALL = 100 mA/µs, CIN = 10 µF

ICL_LCMBST

Valley current limit

1000

mA

(1)

Output Current Accuracy is the difference between the actual value of the output current and programmed value of this current.

Matching is the maximum difference from the average. For the constant current sinks on the device (BLED1 and BLED2), the following

is determined: the maximum output current (MAX), the minimum output current (MIN), and the average output current of both outputs

(AVG). Matching number is calculated: (ILED1 – ILED2)/(ILED1 + ILED2). The typical specification provided is the most likely norm of the

matching figure of all parts. Note that some manufacturers have different definitions in use.

(2)

Typical value only for information.

(3)

Limits set by characterization and/or simulation only.

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