LP5522

SNVS488A – JUNE 2007 – REVISED MARCH 2013

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Electrical Characteristics

(1) (2)

Limits in standard typeface are for TJ = 25°C. Limits in boldface type apply over the operating ambient temperature range (-

30°C < TA < +85°C). Unless otherwise noted, specifications apply to LP5522 Block Diagram with: VIN = 3.6V, RISET = 24 kΩ,

CIN = 100 nF.

Symbol

Parameter

Condition

Min

Typ

Max

Units

IVDD

Standby supply current

CTRL = L

0.2

1

µA

Active Mode Supply Current

CTRL = H, LED = off

40

55

µA

ILEAKAGE

LED Pin Leakage Current

1

µA

IOUT

LED Output Current

Without external resistor

5

mA

−8

+8

%

LED Output Current

With external 24k

Ω 0.04% resistor

20

mA

−8

+8

%

IMIRROR

External RISET

1:400

Mirroring Ratio

VISET

ISET Reference Voltage

1.23

V

VHR

Minimum Headroom Voltage

IOUT set to 10 mA

35

50

mV

(VIN - VLED)

(3)

IOUT set to 20 mA

70

100

mV

T_CYCLE_H

Minimum LED On Time

0.9

1.0

1.1

ms

T_CYCLE_L

Minimum LED Off Time

9

10

11

ms

ONRESOLUTION

LED On Time Resolution

1

ms

OFFRESOLUTIO

LED Off Time Resolution

10

ms

N

T_Timeout_H

LED Timeout On Time

287

319

351

ms

T_Timeout_L

LED Timeout Off Time

2.87

3.19

3.51

s

VIL

Logic Input Low Level

0.5

V

VIH

Logic Input High Level

1.2

V

IIN

CTRL Input Current

-1

1

µA

tON

CTRL Pulse ON Time

15

µs

tOFF

CTRL Pulse OFF Time

30

µs

tENTER

Command Entering Period

500

µs

tENTER+tBLANK

Command Entering Period +

1500

µs

Blank Period

(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)

The current source is connected internally between VIN an VLED. The voltage across the current source, (VIN - VLED), is referred to a

headroom voltage (VHR). Minimum headroom voltage is defined as the VHR voltage when the LED current has dropped 10% from the

value measured at VLED = VIN - 1V.

4

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