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參數(shù)資料
| 型號： | LM27952SDX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 顯示驅(qū)動器 |
| 英文描述： | White LED Adaptive 1.5X/1X Switched Capacitor Current Driver |
| 中文描述： | LED DISPLAY DRIVER, PDSO14 |
| 封裝： | 4 X 3 MM, 0.80 MM HEIGHT, LLP-14 |
| 文件頁數(shù)： | 3/8頁 |
| 文件大小： | 521K |
| 代理商： | LM27952SDX |
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
EN, PWM
-0.3V to 6.0V
-0.3V to (V
IN
+ 0.3V)
w/ 6.0V max
Continuous Power Dissipation
(Note 3)
Junction Temperature
(T
J-MAX-ABS
)
Storage Temperature Range
Lead Temp. (Soldering, 5 sec.)
ESD Rating (Note 4)
Human Body Model
Internally Limited
150C
-65C to 150C
260C
2kV
Operating Ratings
(Notes 2, 7)
Input Voltage V
IN
LED Voltage Range
Junction Temperature Range (T
J
)
Ambient Temperature Range (T
A
)
(Note 5)
3.0V to 5.5V
2.5V to 3.9V
-40C to +115C
-40C to +85 C
Thermal Information
Junction-to-Ambient Thermal Resistance,
LLP-14 Package (
θ
JA
)
(Note 6)
45C/W
Electrical Characteristics
Limits in standard typeface are for T
A
= 25C, and limits in
boldface
type apply over the full operating junction temperature
range (-40C to +85 C). Unless otherwise noted, specifications apply to the LM27952 Typical Application Circuit (pg.1) with V
IN
= 3.6V, V(EN) = 1.8V, V(PWM) = 1.8V, 4 LEDs, V
DX
= 0.45V, C
IN
= C
OUT
= 3.3μF, C
1
= C
2
= 1μF, R
SET
= 12.5k
(Note 8)
Symbol
Parameter
Conditions
I
DX
LED Current Regulation
3.0V
≤
V
IN
≤
5.5V
R
SET
= 12.5k
I
VOUT
= 0mA
3.0V
≤
V
IN
≤
5.5V
R
SET
= 8.32k
I
VOUT
= 0mA
3.0V
≤
V
IN
≤
5.5V
R
SET
= 24.9k
I
VOUT
= 0mA
I
D-MATCH
LED Current Matching
(Note 9)
I
Q
Quiescent Supply Current
D
(1-4)
= OPEN
R
SET
= OPEN
I
SD
Shutdown Supply Current
3.0V
≤
V
IN
≤
5.5V
V(EN) = 0V
V
SET
I
SET
Pin Voltage
3.0V
≤
V
IN
≤
5.5V
I
DX
/ I
SET
Output Current to Current
Set Ratio
V
HR
Current Sink Voltage
Headroom Requirement
(Note 10)
(I
DX
nom. = 31mA)
I
DX
= 95% I
DX
(nom.)
R
SET
= 12.5k
(I
DX
nom. = 21mA)
f
SW
Switching Frequency
(Notes 2, 7)
Min
19.32
(8%)
Typ
21
Max
22.68
(+8%)
Units
mA
31
11
R
SET
= 8.32k
0.2
1
%
1.3
1.7
mA
0.1
1
μA
1.25
200
V
I
DX
= 95% I
DX
(nom.)
R
SET
= 8.32k
360
mV
240
525
(-30%)
1.0
750
975
(+30%)
V
IN
kHz
V
IH
Logic Input High
Input Pins: EN, PWM
3.0V
≤
V
IN
≤
5.5V
Input Pins: EN, PWM
3.0V
≤
V
IN
≤
5.5V
V
V
IL
Logic Input Low
0
0.4
L
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|---|---|
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