Datasheet Texas Instruments LP8557 — 数据表

制造商	Texas Instruments
系列	LP8557

平板电脑高效LED背光驱动器

数据表

PDF, 1.7 Mb, 修订版: B, 档案已发布: Dec 18, 2015

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	LP8557AYFQR	LP8557AYFQT	LP8557IAYFQR	LP8557IAYFQT
Lifecycle Status	Active (Recommended for new designs)	Active (Recommended for new designs)	Active (Recommended for new designs)	Active (Recommended for new designs)
Manufacture's Sample Availability	No	No	Yes	Yes

	LP8557AYFQR	LP8557AYFQT	LP8557IAYFQR	LP8557IAYFQT
N	1	2	3	4
Pin	16	16	16	16
Package Type	YFQ	YFQ	YFQ	YFQ
Industry STD Term	DSBGA	DSBGA	DSBGA	DSBGA
JEDEC Code	S-XBGA-N	S-XBGA-N	S-XBGA-N	S-XBGA-N
Package QTY	3000	250	3000	250
Carrier	LARGE T&R	SMALL T&R	LARGE T&R	SMALL T&R
Device Marking	D40	D40	D41	D41
Thickness (mm)	.42	.42	.42	.42
Pitch (mm)	.4	.4	.4	.4
Max Height (mm)	.675	.675	.675	.675
Mechanical Data	下载	下载	下载	下载

Parameters / Models	LP8557AYFQR	LP8557AYFQT	LP8557IAYFQR	LP8557IAYFQT
Number of Channels	6	6	6	6
Duty Cycle(Max), %	100	100	100	100
LED	48	48	48	48
LED Current Per Channel, mA	25	25	25	25
Operating Temperature Range, C	-30 to 85	-30 to 85	-30 to 85	-30 to 85
Package Group	DSBGA	DSBGA	DSBGA	DSBGA
Package Size: mm2:W x L, PKG	See datasheet (DSBGA)	See datasheet (DSBGA)	See datasheet (DSBGA)	See datasheet (DSBGA)
Peak Efficiency, %	93	93	93	93
Rating	Catalog	Catalog	Catalog	Catalog
Shutdown Current(Typ), uA	0.001	0.001	0.001	0.001
Special Features	CABC,Edge Rate Control	CABC,Edge Rate Control	CABC,Edge Rate Control	CABC,Edge Rate Control
Switching Frequency(Max), kHz	1000	1000	1000	1000
Topology	Boost	Boost	Boost	Boost
Type	Inductive	Inductive	Inductive	Inductive
Vin(Max), V	5.5	5.5	5.5	5.5
Vin(Min), V	2.7	2.7	2.7	2.7
Vout(Max), V	28	28	28	28
Vout(Min), V	7	7	7	7

	LP8557AYFQR	LP8557AYFQT	LP8557IAYFQR	LP8557IAYFQT
RoHS	Compliant	Compliant	Compliant	Compliant

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Schottky Diode Selection in Asynchronous Boost Converters
PDF, 491 Kb, 档案已发布: Sep 6, 2016
Asynchronous boost converters require a Schottky diode as the rectifying element due to the diode's lowforward voltage and fast turn-on time. Because of these characteristics asynchronous boost converterscan have as good as, or better efficiency, than synchronous boost converters. This is especially true whenthe boost conversion ratios (VOUT/VIN) are high, and the Schottky diode conduction t
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Inductor Selection in Boost Converters for LCD Backlight Applications
PDF, 764 Kb, 档案已发布: Oct 24, 2016
White LED drivers for LCD back-light applications are often designed for battery-powered devices. This makes circuit size and efficiency crucial. Because of this, selecting the optimal inductor is one of the mostimportant aspects of the design. This application note discusses the important parameters of the inductorand how to select the right inductor for the application.

系列: LP8557 (4)