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LM27966 数据表(PDF) 3 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
部件名 LM27966
功能描述  White LED Driver with I2C Compatible Interface
Download  13 Pages
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制造商  NSC [National Semiconductor (TI)]
网页  http://www.national.com
标志 NSC - National Semiconductor (TI)

LM27966 数据表(HTML) 3 Page - National Semiconductor (TI)

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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
Dx 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
Juntion-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 VDx = 0.4V; VDAUX = 0.4V; RSET = 16.9kΩ;Dx =DAUX =
Fullscale Current; EN-MAIN, EN-D5 Bits = “1”; C1=C2=1.0µF, C
IN=COUT=1.0µF; Specifications related to output current(s) and
current setting pins (I
Dx and ISET) apply to Main Display and Auxiliary LED. (Note 9)
Symbol
Parameter
Condition
Min
Typ
Max
Units
I
Dx
Output Current Regulation
Main Display or Auxiliary LED
Enabled
3.0V
≤ V
IN
≤ 5.5V
EN-AUX= ’0’
18.2
(-9.5%)
20.1
22.0
(+9.5%)
mA
(%)
3.0V
≤ V
IN
≤ 5.5V
EN-AUX = ’1’ and EN-MAIN = EN-D5 = ’0’
19.2
(-7.7%)
20.8
22.4
(+7.7%)
mA
(%)
Maximum Output Current
Regulation
Main Display and Auxiliary LED
Enabled
(Note 10)
3.2V
≤ V
IN
≤ 5.5V
R
SET = 8.33k
V
LED = 3.6V
EN-MAIN = EN-D5 = EN-AUX = “1”
30
Dx
mA
30
D
AUX
I
Dx-MATCH
LED Current Matching
(Note 11)
0.3
1.7
%
R
OUT
Open-Loop Charge Pump Output
Resistance
Gain = 3/2
2.75
Gain = 1
1
V
DxTH
V
Dx 1x to 3/2x Gain Transition
Threshold
V
Dx Falling
RSET = 16.9k
175
mV
V
HR
Current Source Headroom Voltage
Requirement
(Note 12)
I
Dxx = 95% xIDxx (nom.)
(I
Dxx (nom)
≈ 15mA)
Gain = 3/2
EN-MAIN = EN-D5 and/or EN-AUX= "1"
110
mV
I
Q
Quiescent Supply Current
Gain = 1.5x, No Load
2.90
3.32
mA
I
SD
Shutdown Supply Current
All EN-x bits = "0"
3.4
5.4
µA
V
SET
I
SET Pin Voltage
2.7V
≤ V
IN
≤ 5.5V
1.25
V
I
Dx/
I
SET
Output Current to Current Set
Ratio Main Display, DAUX
200
f
SW
Switching Frequency
0.89
1.27
1.57
MHz
t
START
Start-up Time
P
OUT = 90% steady state
250
µs
f
PWM
Internal Diode Current PWM
Frequency
20
kHz
www.national.com
3


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