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LM2756 PDF даташит

Спецификация LM2756 изготовлена ​​​​«National Semiconductor» и имеет функцию, называемую «Multi-Display Inductorless LED Driver».

Детали детали

Номер произв LM2756
Описание Multi-Display Inductorless LED Driver
Производители National Semiconductor
логотип National Semiconductor логотип 

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LM2756 Даташит, Описание, Даташиты
December 5, 2007
LM2756
Multi-Display Inductorless LED Driver with 32 Exponential
Dimmingwww.datasheet4u.com Steps in micro SMD
General Description
The LM2756 is a highly integrated, switched-capacitor, multi-
display LED driver that can drive up to 8 LEDs in parallel with
a total output current of 180mA. Regulated internal current
sources deliver excellent current and brightness matching in
all LEDs.
The LED driver current sinks are split into three independently
controlled groups. The primary group (Group A) can be con-
figured to drive four, five or six LEDs for use in the main phone
display, while the secondary group (Group B) can be config-
ured to drive one, two or three LEDs for driving secondary
displays, keypads and/or indicator LEDs. An additional driver,
D1C, is provided for additional indicator lighting functions.
The device provides excellent efficiency without the use of an
inductor by operating the charge pump in a gain of 3/2 or in
Pass-Mode. The proper gain for maintaining current regula-
tion is chosen, based on LED forward voltage, so that effi-
ciency is maximized over the input voltage range.
The LM2756 is available in National’s tiny 20-bump, 0.4mm
pitch, thin micro SMD package.
Features
Drives up to 8 LEDs with up to 30mA of Diode Current
Each
32 Exponential Dimming Steps with 800:1 Dimming Ratio
for Group A (Up to 6 LEDs)
8 Linear Dimming States for Groups B (Up to 3 LEDs) and
D1C (1 LED)
Programmable Auto-Dimming Function
3 Independently Controlled LED Groups Via I2C
Compatible Interface
Up to 90% Efficiency
Total Solution Size < 21mm2
Low Profile 20 Bump micro SMD Package
(1.615mm × 2.015mm × 0.6mm)
0.4% Accurate Current Matching
Internal Soft-Start Limits Inrush Current
True Shutdown Isolation for LED’s
Wide Input Voltage Range (2.7V to 5.5V)
Active High Hardware Enable
Applications
Dual Display LCD Backlighting for Portable Applications
Large Format LCD Backlighting
Display Backlighting with Indicator Light
Typical Application Circuit
© 2007 National Semiconductor Corporation 300097
30009701
www.national.com









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LM2756 Даташит, Описание, Даташиты
www.datasheet4u.com
Connection Diagram
Minimum Layout
30009741
20 Bump micro SMD Package
NS Package Number TMD20AAA
30009702
Pin Descriptions
Bump #s
TMD20AAA
A3
A2
A1, C1, B1, B2
D3, E3,E4, D4
C4, B4
B3
C3
D2
Pin Names
VIN
VOUT
C1+, C1-, C2+, C2-
D1A-D4A
D53, D62
D1B
D1C
ISET
E1
C2
E2
A4, D1
HWEN
SDIO
SCL
GND
Ordering Information
Pin Descriptions
Input voltage. Input range: 2.7V to 5.5V.
Charge Pump Output Voltage
Flying Capacitor Connections
LED Drivers - GroupA
LED Drivers - Configurable Current Sinks. Can be assigned to GroupA or GroupB
LED Drivers - GroupB
LED Driver - Indicator LED
Placing a resistor (RSET) between this pin and GND sets the full-scale LED current for
DxA , DxB, D53, D62 and D1C LEDs.
Full-Scale LED Current = 189 × (1.25V ÷ RSET)
Hardware Enable Pin. High = Normal Operation, Low = RESET
Serial Data Input/Output Pin
Serial Clock Pin
Ground
Order Information
LM2756TM
LM2756TMX
Package
TMD20AAA
Supplied As
250 Units, Tape & Reel
3000 Units, Tape & Reel
www.national.com
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LM2756 Даташит, Описание, Даташиты
Absolute Maximum Ratings (Notes 1, 2)
Operating Rating
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN pin voltage
SCL, SDIO, HWEN pin voltages
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Continuous Power Dissipation
(Note 3)
Junction Temperature (TJ-MAX)
Storage Temperature Range
Maximum Lead Temperature
(Soldering)
ESD Rating(Note 5)
Human Body Model
-0.3V to 6.0V
-0.3V to (VIN+0.3V)
w/ 6.0V max
-0.3V to (VVOUT+0.3V)
w/ 6.0V max
Internally Limited
150°C
-65°C to +150° C
(Note 4)
2.0kV
(Notes 1, 2)
Input Voltage Range
LED Voltage Range
Junction Temperature (TJ) Range
Ambient Temperature (TA) Range
(Note 6)
2.7V to 5.5V
2.0V to 4.0V
-30°C to +105°C
-30°C to +85°C
Thermal Properties
Junction-to-Ambient Thermal
Resistance (θJA),
TMD20 Package
(Note 7)
40°C/W
ESD Caution Notice National Semiconductor
recommends that all integrated circuits be handled with
appropriate ESD precautions. Failure to observe proper ESD
handling techniques can result in damage to the device.
Electrical Characteristics (Notes 2, 8)
Limits in standard typeface are for TJ = 25°C, and limits in boldface type apply over the full operating temperature range. Unless
otherwise specified: VIN = 3.6V; VHWEN = VIN; VDxA = VDxB = VDxC = 0.4V; RSET = 11.8k; GroupA = GroupB = GroupC = Fullscale
Current; ENA, ENB, ENC Bits = “1”; SD53, SD62, 53A, 62A Bits = "0"; C1 = C2 = CIN= COUT= 1.0µF; Specifications related to
output current(s) and current setting pins (IDxx and ISET) apply to GroupA and GroupB. (Note 9)
Symbol
Parameter
Condition
Min Typ Max Units
Output Current Regulation
GroupA
2.7V VIN 5.5V
ENA = '1', 53A = 62A = '0'', ENB = ENC = '0'
4 LEDs in GroupA
18.65
(-8%)
2.7V VIN 5.5V
18.70
ENA = '1', 53A = 62A = '1', ENB = ENC = '0' (-8.5%)
6 LEDs in GroupA
20.28
20.40
21.90
(+8%)
22.10
(+8.5%)
mA
(%)
mA
(%)
Output Current Regulation
GroupB
IDxx Output Current Regulation
IDC
2.7V VIN 5.5V
ENB = '1', 53A = 62A = '0', ENA = ENC = '0'
3 LEDs in GroupB
18.40
(-8%)
2.7V VIN 5.5V
ENC = '1', ENA = ENB = '0'
18.20
(-7.5%)
20.00
19.70
21.60
(+8%)
21.20
(+7.5%)
mA
(%)
mA
(%)
Maximum Diode Current per Dxx
Output(Note 10)
RSET = 8.33k
30 mA
Output Current Regulation
GroupA, GroupB, and GroupC
Enabled
(Note 10)
3.2V VIN 5.5V
VLED = 3.6V
RSET = 10.5k
22.5
DxA
22.5
DxB
mA
22.5
DxC
IDxx-
MATCH
LED Current Matching(Note 11)
2.7V VIN 5.5V
GroupA (4 LEDs)
GroupA (6 LEDs)
GroupB (3 LEDs)
0.4 1.8
1.0 2.7
0.7 2.5
%
VDxTH
VDxx 1x to 3/2x Gain Transition
Threshold
VDxA and/or VDxB Falling
150 mV
VHR
Current sink Headroom Voltage
Requirement
(Note 12)
IDxx = 95% ×IDxx (nom.)
(IDxx (nom) 20mA)
65 mV
ROUT
Open-Loop Charge Pump Output
Resistance
Gain = 3/2
Gain = 1
2.4
0.9
IQ Quiescent Supply Current
Gain = 1.5x, No Load
2.1 2.5 mA
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