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LP8556 Datasheet(PDF) 3 Page - Texas Instruments

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Part # LP8556
Description  High-Efficiency LED Backlight Driver for Tablets
PDF  52 Pages
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Manufacturer  TI [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI - Texas Instruments

LP8556 Datasheet(HTML) 3 Page - Texas Instruments

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background image
SW
GND
SW
PWM
SDA
SCL
SW
GND
SW
FSET
VDD
EN
VDDIO
LED3
VLDO
ISET
VBOOST
LED2
LED6
LED5
LED4
GND
LED1
A
B
C
D
E
4
3
2
1
SCL
SDA
VBOOST
GND
SW
SW
EN
VDDIO
GND
SW
SW
LED3
PWM
VDD
LED2
FSET
ISET
VLDO
LED1
GND
LED4
LED5
LED6
A
B
C
D
E
1
2
3
4
LP8556
www.ti.com
SNVS871B – JULY 2012 – REVISED SEPTEMBER 2012
Recommended Inductance for the Boost Power Stage
Assumes 20 mA as the maximum LED current per string and 3.3V as the maximum LED forward voltage.
Number of LED
Number of LEDs per Boost Input Voltage
L1 Inductance [
μH]
Strings
String
Range [V]
fSW = 1250 kHz
fSW = 625 kHz
fSW = 312 kHz
2.7V - 4.4V
3.3
μH - 6.8 μH
6.8
μH - 15 μH
10
μH - 33 μH
6
6
5.4V - 8.8V
10
μH - 22 μH
22
μH - 47 μH
47
μH - 100 μH
2.7V - 4.4V
4.7
μH - 10 μH
10
μH - 15 μH
22
μH - 33 μH
6
8
5.4V - 8.8V
10
μH - 22 μH
22
μH - 68 μH
47
μH - 100 μH
4
10
5.4V - 8.8V
6.8
μH - 22 μH
22
μH - 47 μH
47
μH - 100 μH
4
12
5.4V - 8.8V
10
μH - 22 μH
22
μH - 47 μH
33
μH - 100 μH
Recommended Capacitances for the Boost and LDO Power Stages
(1)
Switching Frequency [kHz]
CIN [μF]
COUT [μF]
CVLDO [μF]
1250
2.2
4.7
10
625
2.2
4.7
10
312
4.7
10
10
(1)
Capacitance of Multi Layer Ceramic Capacitors (MLCC) can change significantly with the applied DC voltage. Use capacitors with good
capacitance vs. DC bias characteristics. In general, MLCC in bigger packages have lower capacitance de-rating than physically smaller
capacitors.
Connection Diagrams (DSBGA)
Figure 1. 20-bump DSBGA Package – Top View
Figure 2. Bottom View
See Package Number YFQ0020
Copyright © 2012, Texas Instruments Incorporated
Submit Documentation Feedback
3
Product Folder Links: LP8556



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