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LM2755 Datasheet Preview

LM2755 Datasheet

Charge Pump LED Controller

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LM2755
www.ti.com
SNVS433D – OCTOBER 2007 – REVISED APRIL 2013
LM2755 Charge Pump LED Controller with I2C-Compatible Interface in DSBGA Package
Check for Samples: LM2755
FEATURES
1
2 90% Peak Efficiency
• Total solution size < 13mm2
• 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 I2C-
Compatible Interface
• Hardware Enable Pin
• Wide Input Voltage Range: 2.7V to 5.5V
• Tiny 18-bump Thin DSBGA : 1.8mm x 1.6mm x
0.6mm
APPLICATIONS
• Indicator LEDs
• Keypad LED Backlight
• Display LED Backlight
• Fun-light LEDs
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)
programmed via an I2C-compatible interface. The 32
brightness levels found on the LM2755 are
exponentially spaced (as opposed 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 capacitors. 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 Texas Instruments' tiny
18-bump thin DSBGA package.
TYPICAL APPLICATION CIRCUIT
0.47 PF 0.47 PF
1 PF
C1- C1+ C2- C2+
VIN POUT
1 PF
SCL LM2755
SDIO
D1
VIO D2
SYNC
HWEN
ISET
GND ADDR
D3
12.5 k:
Capacitors:
TDK C1005X5R1A105M and C1005X5R1A474M ,
or 1 PF and 0.47 PF single capacitor equivalent
3.1 mm
C2
COUT
ADR
VIO
SCL
SDIO
SYNC
HWEN
C1
Dx Pins
CIN
RSET
Figure 1. Typical Application Circuit
Figure 2. Minimum Solution Size
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
All trademarks are the property of their respective owners.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2007–2013, Texas Instruments Incorporated




etcTI

LM2755 Datasheet Preview

LM2755 Datasheet

Charge Pump LED Controller

No Preview Available !

LM2755
SNVS433D – OCTOBER 2007 – REVISED APRIL 2013
Connection Diagram
77
66
55
44
33
22
11
ABCDE
EDCBA
Top View
Bottom View
Figure 3. 18-Bump Thin DSBGA Package
1.615mm × 1.807mm × 0.6mm
(See Package Number YFQ0018AAA)
www.ti.com
Pin #s
A1
A3
A5
A7
B2
B4
B6
C1
C3
C5
C7
D2
D4
D6
E1
E3
E5
E7
Pin Names
ID1
ID2
ID3
SYNC
ISET
HWEN
SDIO
VIN
GND
VIO
SCL
POUT
C2-
GND
C1+
C2+
C1-
ADDR
PIN DESCRIPTIONS
Pin Descriptions
LED Driver 1
LED Driver 2
LED Driver 3
External clock synchronization input
LED Driver Current Set Pin
Hardware EN Pin. Low '0' = RESET, High '1' = Normal Operation
Serial data Input/Output pin
Input Voltage Connection
Ground Connection.
Serial Bus Voltage Level Input
Serial Clock Pin
Charge Pump Output
Flying Capacitor Connect
Ground connection
Flying Capacitor Connect
Flying Capacitor Connect
Flying Capacitor Connect
Chip Address Select Input. VIN = 0x67. Ground = 0x18.
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
2 Submit Documentation Feedback
Product Folder Links: LM2755
Copyright © 2007–2013, Texas Instruments Incorporated


Part Number LM2755
Description Charge Pump LED Controller
Maker etcTI
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