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LP5522 Datasheet(PDF) 4 Page - Texas Instruments

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Part # LP5522
Description  Programmable LED Driver
PDF  17 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

LP5522 Datasheet(HTML) 4 Page - Texas Instruments

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LP5522
SNVS488 – JUNE 2007
www.ti.com
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 the LP5522 Block Diagram with: VIN = 3.6V, RISET = 24
k
Ω, 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 guaranteed by design, test, or statistical analysis. Typical numbers are not guaranteed, 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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Copyright © 2007, Texas Instruments Incorporated
Product Folder Links: LP5522



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