LP5521TM NSC [National Semiconductor], LP5521TM Datasheet

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LP5521TM

Manufacturer Part Number
LP5521TM
Description
Programmable Three Channel LED Driver
Manufacturer
NSC [National Semiconductor]
Datasheet

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© 2007 National Semiconductor Corporation
LP5521
Programmable Three Channel LED Driver
General Description
The LP5521 is a three channel LED driver designed to pro-
duce variety of lighting effects for mobile devices. High effi-
ciency charge pump enables LED driving over full Li-Ion
battery voltage range. The device has a program memory for
creating variety of lighting sequences. When program mem-
ory has been loaded, LP5521 can operate independently
without processor control.
LP5521 maintains excellent efficiency over a wide operating
range by automatically selecting proper charge pump gain
based on LED forward voltage requirements. LP5521 is able
to automatically enter power-save mode, when LED outputs
are not active and thus lowering current consumption.
Three independent LED channels have accurate pro-
grammable current sources and PWM control. Each channel
has program memory for creating desired lighting sequences
with PWM control.
LP5521 has a flexible digital interface. Trigger I/O and 32 kHz
clock input allow synchronization between multiple devices.
Interrupt output can be used to notify processor, when LED
sequence has ended. LP5521 has four pin selectable I
dresses. This allows connecting up to four parallel devices in
one I
trol pin for other devices.
LP5521 requires only four small and low cost ceramic capac-
itors.
LP5521 is available in tiny 2.1x1.7x0.6 mm microSMD-20
package and in 4.0x5.0x0.8 mm bumped LLP-24 package.
Comprehensive application tools are available, including
command compiler for easy LED sequence programming.
Typical Application
2
C bus. GPO and INT pins can be used as a digital con-
201862
2
C ad-
Features
Applications
Adaptive charge pump with 1x and 1.5x gain provides up
to 95% LED drive efficiency
Charge pump with soft start and overcurrent/short circuit
protection
Low input ripple and EMI
Very small solution size, no inductor or resistors required
200 nA typical shutdown current
Automatic power save mode
I
Independently programmable constant current outputs
with 8-bit current setting and 8-bit PWM control
Typical LED output saturation voltage 50 mV and current
matching 1%
Three program execution engines with flexible instruction
set
Autonomous operation without external control
Large SRAM program memory
Two general purpose digital outputs
microSMD-20 package, 0.4 mm pitch
Bumped LLP-24 package, 0.5 mm pitch
Fun / indicator lights
LCD sub-display backlighting
Keypad RGB backlighting and phone cosmetics
Vibra, speakers, waveform generator
2
C compatible interface
20186270
www.national.com
June 2007

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LP5521TM Summary of contents

Page 1

LP5521 Programmable Three Channel LED Driver General Description The LP5521 is a three channel LED driver designed to pro- duce variety of lighting effects for mobile devices. High effi- ciency charge pump enables LED driving over full Li-Ion battery voltage ...

Page 2

Connection Diagrams and Package Mark Information Thin microSMD-20 Package (2.1 x 1.7 x 0.6 mm, 0.4 mm pitch) Top View Package Mark www.national.com NS Package Number TMD20ECA 20186271 Package Mark - Top View 2 20186272 Bottom View 20186296 ...

Page 3

... Connection Diagrams and Package Mark Information Bumped LLP-24 Package ( 0.8 mm, 0.5 mm pitch) Bottom View Ordering Information Order Number Package LP5521TM µSMD LP5521TM X µSMD LP5521YQ bumped LLP LP5521YQ X bumped LLP NS Package Number YQA24A 20186202 Package Mark - Top View U = Fab Z = Assembly Digit Date Code ...

Page 4

... Pin Descriptions LP5521TM Pin # Name SCL 1E SDA 2A VOUT 2B ADDR_SEL1 2C ADDR_SEL0 2D GPO CFLY2N 3B CFLY1N 3C GND 3D CLK_32K 3E INT 4A CFLY2P 4B CFLY1P 4C VDD 4D GND 4E TRIG A: Analog Pin, G: Ground Pin, P: Power Pin, I: Input Pin, I/O: Input/Output Pin, O: Output Pin, OD: Open Drain Pin www.national.com ...

Page 5

Pin Descriptions LP5521YQ Pin # Name Type 1 CFLY2P 2 CFLY1P 3 VDD 4 GND 5 CLK_32K 6 INT OD/O 7 TRIG I/OD 8 N/C 9 N/C 10 N/C 11 N/C 12 N/C 13 SDA I/ SCL ...

Page 6

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. V OUT Voltage on Logic Pins Continuous Power Dissipation (Note 3) Junction ...

Page 7

LED Driver Electrical Characteristics ( Outputs) Symbol Parameter pin leakage current LEAKAGE I Maximum Source Current MAX I Accuracy of output current OUT I Matching (Note 11) MATCH f LED PWM switching frequency LED ...

Page 8

Timing Parameters (SDA, SCL) Symbol f Clock Frequency SCL 1 Hold Time (repeated) START Condition 2 Clock Low Time 3 Clock High Time 4 Setup Time for a Repeated START Condition 5 Data Hold Time 6 Data ...

Page 9

Typical Performance Characteristics Unless otherwise specified 3.6V DD LED Drive Efficiency vs. Input Voltage Automatic Gain Change LED Current vs. Current Register Code Charge Pump Efficiency vs. Load Current LED Current vs. Output Pin Headroom Voltage 20186221 LED ...

Page 10

Charge Pump Output Voltage vs. Load Current Charge Pump Automatic Gain Change Hysteresis Charge Pump Load Transient Response in 1.5x Mode (0 to 25.5 mA) www.national.com Charge Pump Output Voltage vs. Input Voltage Automatic Gain Change from 1x to 1.5x ...

Page 11

Charge Pump Automatic Gain Change (LED V For full LP5521 datasheet please contact nearest National Semiconductor sales office. = 3.6V) Standby Current vs. Input Voltage F 20186216 11 20186217 www.national.com ...

Page 12

Physical Dimensions The dimension for X1 ,X2 and X3 are as given: X1=1.717 mm ± 0.03 mm X2=2.066 mm ± 0.03 mm X3=0.600 mm ± 0.075 mm www.national.com inches (millimeters) unless otherwise noted TMD20ECA: Thin microSMD-20, Small Bump YQA24A: Bumped ...

Page 13

Notes 13 www.national.com ...

Page 14

THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION (“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE ...

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