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LM27965 Datasheet(Hoja de datos) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
No. de Pieza. LM27965
Descripción  Dual Display White LED Driver with I2C Compatible Brightness Control
Descarga  13 Pages
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Fabricante  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
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Absolute Maximum Ratings (Notes 1, 2)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
V
IN pin voltage
-0.3V to 6.0V
SCL, SDIO, VIO, RESET pin
voltages
-0.3V to (V
IN+0.3V)
w/ 6.0V max
I
Dxx Pin Voltages
-0.3V to
(V
POUT+0.3V)
w/ 6.0V max
Continuous Power Dissipation
(Note 3)
Internally Limited
Junction Temperature (T
J-MAX)
150oC
Storage Temperature Range
-65oC to +150o C
Maximum Lead Temperature
(Soldering)
(Note 4)
ESD Rating(Note 5)
Human Body Model
2.0kV
Operating Rating (Notes 1, 2)
Input Voltage Range
2.7V to 5.5V
LED Voltage Range
2.0V to 4.0V
Junction Temperature (T
J) Range
-30˚C to +100˚C
Ambient Temperature (T
A)
Range(Note 6)
-30˚C to +85˚C
Thermal Properties
Junction-to-Ambient Thermal
Resistance (
θ
JA), SQA24A Package
(Note 7)
41.3˚C/W
ESD Caution Notice National Semiconduc-
tor 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 T
J = 25˚C, and limits in boldface type apply over the full operating temperature range. Un-
less otherwise specified: V
IN = 3.6V; VRESET =VIN; VIO = 1.8V VDxA =VDxB =VDxC = 0.4V; RSET = 12.7k
Ω; BankA = BankB =
BankC = Fullscale Current; ENA, ENB, ENC, EN5A, EN3B Bits = “1”; C1 = C2 = C
IN=COUT= 1.0µF; Specifications related to
output current(s) and current setting pins (I
Dxx and ISET) apply to BankA and BankB. (Note 9)
Symbol
Parameter
Condition
Min
Typ
Max
Units
I
Dxx
Output Current Regulation
BankA or BankB Enabled
3.0V
≤ V
IN
≤ 5.5V
ENA = ’1’ or ENB = ’1’ and ENC= ’0’
18.2
(-9.5%)
20.1
22.0
(+9.5%)
mA
(%)
Output Current Regulation
BankC Enabled
3.0V
≤ V
IN
≤ 5.5V
ENC = ’1’ and ENA = ENB= ’0’
19.2
(-7.7%)
20.8
22.4
(+7.7%)
mA
(%)
Maximum Diode Current per Dxx
Output(Note 10)
R
SET = 8.33k
30
mA
Output Current Regulation
BankA, BankB, and BankC
Enabled
(Note 10)
3.2V
≤ V
IN
≤ 5.5V
V
LED = 3.6V
20
DxA
mA
20
DxB
20
DxC
I
Dxx-MATCH
LED Current Matching(Note 11)
3.0V
≤ V
IN
≤ 5.5V
BankA
0.3
1.7
%
BankB
0.3
1.4
R
OUT
Open-Loop Charge Pump Output
Resistance
Gain = 3/2
2.75
Gain = 1
1
V
DxTH
V
Dxx 1x to 3/2x Gain Transition
Threshold
V
DxA and/or VDxB Falling
R
SET = 16.9k
175
mV
V
HR
Current sink Headroom Voltage
Requirement
(Note 12)
I
Dxx = 95% xIDxx (nom.)
(I
Dxx (nom)
≈ 15mA)
R
SET = 16.9k
110
mV
I
Q
Quiescent Supply Current
Gain = 1.5x, No Load
2.90
3.32
mA
I
SD
Shutdown Supply Current
All ENx bits = "0"
3.4
5.4
µA
V
SET
I
SET Pin Voltage
2.7V
≤ V
IN
≤ 5.5V
1.25
V
I
DxA-B-C /
I
SET
Output Current to Current Set
Ratio BankA, BankB, BankC
200
f
SW
Switching Frequency
0.89
1.27
1.57
MHz
t
START
Start-up Time
P
OUT = 90% steady state
250
µs
www.national.com
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