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參數資料
| 型號： | LM2796 |
| 廠商： | National Semiconductor Corporation |
| 元件分類： | LED驅動器 |
| 英文描述： | Dual-Display White LED Driver with 3/2x Switched Capacitor Boost |
| 中文描述： | 雙顯示器白光LED驅動3/2x開關電容升壓 |
| 文件頁數： | 3/8頁 |
| 文件大小： | 172K |
| 代理商： | LM2796 |
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
EN, ENA, ENB pin voltages
-0.3V to 7.1V
-0.3V to (V
IN
+0.3V)
w/ 5.6V max
Internally Limited
Continuous Power Dissipation
(Note 3)
Junction Temperature (T
J-MAX
)
Storage Temperature Range
Maximum Lead Temperature
(Soldering, 10 sec.)
ESD Rating (Note 4)Human Body
Model:
Machine Model
150
o
C
-65
o
C to +150
o
C
265
o
C
2.0kV
200V
Operating Rating
(Notes 1, 2)
Input Voltage Range
Junction Temperature (T
J
) Range
Ambient Temperature (T
A
) Range
(Note 5)
2.7V to 5.5V
-30C to +125C
-30C to +85C
Thermal Properties
Juntion-to-Ambient Thermal
Resistance (
θ
JA
), (Note 6)
100C/W
Electrical Characteristics
Limits in standard typeface and typical values apply for T
J
= 25
o
C. Limits in
boldface
type apply over the full operating junction
temperature range (-30C
≤
T
J
≤
+85C) . Unless otherwise specified: V
IN
= 3.6V; V
Dxx
= 3.6V; V(EN) = 2.0V; Group A and
Group B LEDs not ON simultaneously (ENA = V
IN
and ENB = GND, or ENA = GND and ENB = V
IN
); R
SET
= 8.35k
; C
IN
, C
1
,
C
2
, and C
POUT
= 1μF. (Note 8)
Symbol
Parameter
Condition
3.0V
≤
V
IN
≤
4.2V, and V
IN
= 5.5V
2.5V
≤
V
Dxx
≤
3.8V;
R
SET
= 8.35k
3.0V
≤
V
IN
≤
5.5V;
2.5V
≤
V
Dxx
≤
3.6V;
R
SET
= 6.25k
3.0V
≤
V
IN
≤
5.5V;
2.5V
≤
V
Dxx
≤
3.9V;
R
SET
= 12.5k
2.7V
≤
V
IN
≤
3.0V;
2.5V
≤
V
Dxx
≤
3.3V;
R
SET
= 8.35k
ENA and ENB ON (all 7 I
DX
outputs active),
V
IN
= 3.0V, C
IN
= C
OUT
= 2.2μF
I
Dxx-MATCH
Current Matching Between Any
Two Group A Outputs or Group
B Outputs
I
Q
Quiescent Supply Current
2.7V
≤
V
IN
≤
4.2V;
No Load Current,
EN = ON, ENA = ENB = OFF
I
SD
Shutdown Supply Current
2.7V
≤
V
IN
≤
5.5V, EN = OFF
V
SET
I
SET
Pin Voltage
2.7V
≤
V
IN
≤
5.5V
I
Dxx
/I
SET
Output Current to Current Set
Ratio
R
OUT
Charge Pump Output Resistance
(Note 11)
V
HR
Current Source Headroom
Voltage Requirement (Note 12)
R
SET
= 8.35k
(I
Dxx
(nom)
≈
15mA)
I
Dxx
= 95%X I
Dxx
(nom)
R
SET
= 12.5k
(I
Dxx
(nom)
≈
10mA)
(Notes 2, 7)
Min
Typ
Max
Units
I
Dxx
Output Current Regulation
13.8
(-8%)
15
16.2
(+8%)
mA
(%)
20
mA
10
mA
15
mA
15
mA
V
IN
= 3.0V (Note 10)
1
%
3.5
6
mA
3
4.5
μA
V
1.25
100
V
IN
= 3.0V
2.7
I
Dxx
= 95% X I
Dxx
(nom)
320
mV
220
L
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