lm2755tmx National Semiconductor Corporation, lm2755tmx Datasheet

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lm2755tmx

Manufacturer Part Number
lm2755tmx
Description
Charge Pump Led Controller With I2c Compatible Interface In Micro Smd
Manufacturer
National Semiconductor Corporation
Datasheet
1.LM2755TMX.pdf (14 pages)
© 2007 National Semiconductor Corporation
LM2755
Charge Pump LED Controller with I2C Compatible Interface
in Micro SMD
General Description
The LM2755 is a charge-pump-based, constant current LED
driver capable of driving 3 LEDs with a total output current up
to 90mA. The diode current waveforms of each LED can be
trapezoidal with timing and level parameters (rise time, fall
time, high level, low level, delay, high time, low time) pro-
grammed via an I
levels found on the LM2755 are exponentially spaced (as op-
posed to linearly spaced) to better match the response of the
human eye to changing brightness levels.
The device requires only four small and low-cost ceramic ca-
pacitors. The LM2755 provides excellent efficiency without
the use of an inductor by operating the charge pump in a gain
of 3/2 or in a gain of 1. Maximum efficiency is achieved over
the input voltage range by actively selecting the proper gain
based on the LED forward voltage requirements.
The pre-regulation scheme used by the LM2755 is optimized
to ensure low conducted noise on the input. An internal soft-
start circuitry eliminates high inrush current at start-up. The
LM2755 consumes 3µA (typ.) of supply current in shut-down.
The LM2755 is available in National’s tiny 18-bump thin micro
SMD package.
Typical Application Circuit
2
C compatible interface. The 32 brightness
201809
20180901
Features
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Applications
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90% Peak Efficiency
Total solution size < 13mm
No Inductor Required: Only 4 Inexpensive Ceramic Caps
3 Independently Controlled Constant Current Outputs
Programmable Trapezoidal Dimming Waveform on Each
Output
Programmable Timing Control Via Internal Registers and
External Clock Synchronization Input
32 Exponential Dimming Steps with 800:1 Dimming Ratio
Programmable brightness control via I
interface
Hardware Enable Pin
Wide input voltage range: 2.7V to 5.5V
Tiny 18-bump thin micro SMD: 1.8mm x 1.6mm x 0.6mm
Indicator LEDs
Keypad LED Backlight
Display LED Backlight
Fun-light LEDs
Minimum Solution Size
2
2
C compatible
20180904
www.national.com
October 2007

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lm2755tmx Summary of contents

Page 1

... The LM2755 consumes 3µA (typ.) of supply current in shut-down. The LM2755 is available in National’s tiny 18-bump thin micro SMD package. Typical Application Circuit © 2007 National Semiconductor Corporation Features ■ 90% Peak Efficiency ■ Total solution size < 13mm ■ ...

Page 2

... E5 C1- E7 ADDR Ordering Information Order Information Package LM2755TM TMD18AAA, µSMD-18 LM2755TMX www.national.com 18-Bump Thin Micro SMD Package 1.615mm × 1.807mm × 0.6mm NS Package Number TMD18AAA Pin Descriptions LED Driver 1 LED Driver 2 LED Driver 3 External clock synchronization input LED Driver Current Set Pin Hardware EN Pin ...

Page 3

Absolute Maximum Ratings If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. V pin voltage IN SCL, SDIO, VIO, ADDR, SYNC pin voltages I Pin Voltages Dx Continuous Power Dissipation (Note ...

Page 4

Symbol Parameter t SCL (Clock Period Data In Setup Time to SCL High 2 t Data Out stable After SCL Low 3 SDIO Low Setup Time to SCL Low t 4 (Start) SDIO High Hold Time After SCL ...

Page 5

Typical Performance Characteristics 3.6V 12.5kΩ SET LED Drive Efficiency vs Input Voltage Current Matching vs Input Voltage 3 LEDs Quiescent Current vs Input Voltage Unless otherwise specified: T ...

Page 6

Square Wave Pattern with Delays Trapezoid Wave Pattern Fast Ramp-Up / Slow Ramp-Down Wave Pattern www.national.com Triangle Wave Pattern 20180913 Slow Ramp-Up / Fast Ramp-Down Wave Pattern 20180911 20180915 6 20180912 20180914 ...

Page 7

Block Diagram Circuit Components CHARGE PUMP The input to the 3/2× charge pump is connected to the V pin, and the regulated output of the charge pump is con- IN nected to the V pin. The recommended input ...

Page 8

LM2755 address (0x18 COMPATIBLE INTERFACE DATA VALIDITY The data on SDIO line must be stable during the HIGH period of the clock signal (SCL). In ...

Page 9

INTERNAL REGISTERS OF LM2755 Register Name General Purpose Time Step D1 High Level D1 Low Level D1 Delay: t delay D1 Ramp-Up Step Time Time High: t high D1 Ramp-Down Step Time Timing: t low D2 ...

Page 10

Application Information SETTING FULL-SCALE LED CURRENT The current through the LEDs connected to D1, D2 and D3 can be set to a desired level simply by connecting an appro- priately sized resistor (R ) between the I SET LM2755 and ...

Page 11

Total Output Current Capability The maximum output current that can be drawn from the LM2755 is 90mA. Each driver Group has a maximum allotted current per Dx sink that must not be exceeded. DRIVER TYPE MAXIMUM Dx CURRENT Dx 30mA ...

Page 12

Physical Dimensions www.national.com inches (millimeters) unless otherwise noted TMD18AAA: 18 BUMP µSMD X1 = 1.615mm X2 = 1.807mm X3 = 0.6mm 12 ...

Page 13

Notes 13 www.national.com ...

Page 14

... National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other brand or product names may be trademarks or registered trademarks of their respective holders. ...

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