LM3535 datasheet(4/34 Pages) TI1

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LM3535

SNVS598A – AUGUST 2010 – REVISED MAY 2013

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Electrical Characteristics

(1) (2)

Limits in standard typeface are for TA = 25°C, and limits in boldface type apply over the full operating temperature range (-

30°C to +85°C). Unless otherwise specified: VIN = 3.6V; VHWEN = VIN; VPWM = 0V;VDxA = VDxB = VDxC = 0.4V; GroupA = GroupB

= GroupC = Fullscale Current; ENxA, ENxB, ENxC Bits = “1”; 53A, 62A Bits = "0"; C1 = C2 = CIN= COUT= 1.0µF.

(3)

Symbol

Parameter

Condition

Min

Typ

Max

Units

2.7V

≤ VIN ≤ 5.5V

EN1A to EN4A = '1', 53A = 62A = '0'', EN53 =

23.6

26.3

EN62 = ENxB = ENxC = '0'

(-5.6%)

(+5.2%)

(%)

4 LEDs in GroupA

Output Current Regulation

GroupA

2.7V

≤ VIN ≤ 5.5V

EN1A to EN4A = EN53 = EN62 = '1', 53A =

23.2

26.3

62A = '1'', ENxB = ENxC = '0'

(-7.2%)

(+5.2%)

(%)

6 LEDs in GroupA

2.7V

≤ VIN ≤ 5.5V

Output Current Regulation

EN1B = EN53 = EN62 = '1', 53A = 62A = '0',

23.3

26.0

IDxx

GroupB

ENxA = ENC = '0'

(-6.8%)

(+4.0%)

(%)

3 LEDs in GroupB

Output Current Regulation

2.7V

≤ VIN ≤ 5.5V

23.8

26.8

IDC

ENC = '1', ENxA = ENxB = '0'

(-4.8%)

(+7.2%)

(%)

DxA

Output Current Regulation

3.2V

≤ VIN ≤ 5.5V

GroupA, GroupB, and GroupC Enabled

VLED = 3.6V

DxB

DxC

GroupA (4 LEDs)

0.25

2.40

IDxx-

LED Current Matching(4)

2.7V

≤ VIN ≤ 5.5V

GroupA (6 LEDs)

0.55

2.78

MATCH

GroupB (3 LEDs)

0.25

2.41

VDxx 1x to 3/2x Gain Transition

VDxTH

VDxA and/or VDxB Falling

130

Threshold

Current sink Headroom Voltage

IDxx = 95% ×IDxx (nom.)

VHR

100

Requirement(5)

(IDxx (nom) = 25mA)

Gain = 3/2

2.4

Open-Loop Charge Pump Output

ROUT

Ω

Resistance

Gain = 1

0.5

Gain = 3/2, No Load

2.86

4.38

Quiescent Supply Current

Gain = 1, No Load

1.09

2.31

2.7V

≤ VIN ≤ 5.5V

ISB

Standby Supply Current

1.7

4.0

µA

HWEN = VIN, All ENx bits = "0"

2.7V

≤ VIN ≤ 5.5V

ISD

Shutdown Supply Current

1.7

4.0

µA

HWEN = 0V, All ENx bits = "0"

fSW

Switching Frequency

1.10

1.33

1.56

MHz

tSTART

Start-up Time

VOUT = 90% steady state

250

µs

(1)

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

(2)

Min and Max limits are ensured by design, test, or statistical analysis. Typical numbers are not ensured, but do represent the most likely

norm.

(3)

CIN, CVOUT, C1, and C2 : Low-ESR Surface-Mount Ceramic Capacitors (MLCCs) used in setting electrical characteristics

(4)

For the two groups of current sinks on a part (GroupA and GroupB), the following are determined: the maximum sink current in the

group (MAX), the minimum sink current in the group (MIN), and the average sink current of the group (AVG). For each group, two

matching numbers are calculated: (MAX-AVG)/AVG and (AVG-MIN)/AVG. The largest number of the two (worst case) is considered the

matching figure for the Group. The matching figure for a given part is considered to be the highest matching figure of the two Groups.

The typical specification provided is the most likely norm of the matching figure for all parts.

(5)

For each Dxxpin, headroom voltage is the voltage across the internal current sink connected to that pin. For Group A, B, and C current

sinks, VHRx = VOUT -VLED. If headroom voltage requirement is not met, LED current regulation will be compromised.

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