LM3532

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SNVS653E – JULY 2011 – REVISED AUGUST 2015

6.5 Electrical Characteristics

Minimum and maximum limits apply over the full operating ambient temperature range (

−40°C ≤ TA ≤ +85°C), typical limits are

for TA = 25°C, and VIN = 3.6 V, unless otherwise specified.

(1) (2)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

2.7 V

≤ VIN ≤ 5.5 V, ControlX full-scale

current register = 0xF3, brightness code =

20.2

mA

0xFF

Output current regulation accuracy

ILED(1/2/3)

(ILED1, ILED2 or ILED3)

2.7 V

≤ VIN ≤ 5.5 V, ControlX full-scale

18.68

21.8

mA

current register = 0xF3, brightness code =

0xFF

2.7 V

≤ VIN ≤ 5.5 V, IFULL_SCALE = 20.2 mA

0.3%

Brightness code = 0xFF

IMATCH

(3) (4)

ILED2 to ILED3 current matching

2.7 V

≤ VIN ≤ 5.5 V, IFULL_SCALE = 20.2 mA

–2%

2%

Brightness code = 0xFF

Regulated current sink headroom

VREG_CS

400

mV

voltage

ILED = 95% of nominal and 20.2 mA

200

mV

Current sink minimum headroom

VHR

voltage

ILED = 95% of nominal and 20.2 mA

240

RDSON

NMOS switch on resistance

ISW = 100 mA

0.25

Ω

2.7 V

≤ VIN ≤ 5.5 V

1000

mA

ICL

NMOS switch current limit

2.7 V

≤ VIN ≤ 5.5 V

880

1000

1120

mA

ON threshold, 2.7 V

≤ VIN ≤ 5.5 V

41

VOVP

Output overvoltage protection

ON threshold, 2.7 V

≤ VIN ≤ 5.5 V

40

42

V

Hysteresis

1

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 = 32

IQ_SW

Switching supply current

1.35

mA

V

2.7 V

≤ VIN ≤ 5.5 V, HWEN = GND

1

ISHDN

Shutdown current

µA

2.7 V

≤ VIN ≤ 5.5 V, HWEN = GND

2

−40°C ≤ TA ≤ +85°C

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

(1)

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

(2)

Minimum and Maximum limits are verified by design, test, or statistical analysis. Typical numbers are not verified, but do represent the

most likely norm.

(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.

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