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參數(shù)資料
| 型號： | MAX1579 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Complete Bias and White LED Power Supplies for Small TFT Displays |
| 中文描述： | 可提供完備偏置的白光LED電源，用于TFT顯示器 |
| 文件頁數(shù)： | 2/13頁 |
| 文件大?。?/td> | 221K |
| 代理商： | MAX1579 |
M
Complete Bias and White LED Power S upplies
for S mall T FT Displays
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
IN, CS, C1N, C2N, MAIN, ONBIAS, V
DD
to GND.....-0.3V to +6V
CTRL to GND..................-0.3V to the lesser of +6V or (V
IN
+ 2V)
LX, OUT to GND.....................................................-0.3V to +37V
COMP to GND .............................................-0.3V to (V
IN
+ 0.3V)
CU1 to MAIN ............................................................-0.3V to +6V
CU2 to CU1..............................................................-0.3V to +6V
CU3 to CU2..............................................................-0.3V to +6V
CU3 to POS ............................................................-0.3V to +18V
CU3 to GND ...........................................................-0.3V to +18V
POS to GND ...........................................................-0.3V to +18V
CD1 to MAIN ..........................................................+0.3V to -12V
CD1 to GND .............................................................+0.3V to -6V
CD2 to CD1..............................................................+0.3V to -6V
NEG to CD2..............................................................+0.3V to -6V
ELECTRICAL CHARACTERISTICS
(Circuit of Figure 3, V
IN
= 3V, CTRL = ONBIAS = IN, T
A
= -40
°
C to +85
°
C, typical values are at T
A
= +25
°
C, unless otherwise noted. Note 1)
PARAMETER
CONDITIONS
IN Operating Supply Range
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
NEG, CD2 to GND..................................................+0.3V to -12V
C1P, C2P to GND ...........................................-0.3V to (V
IN
+ 6V)
PMP, PMPB to GND................................-0.3V to (V
MAIN
+ 0.3V)
GND to PGND .......................................................-0.3V to +0.3V
I
LX
...................................................................................1.0A
RMS
Continuous Power Dissipation (T
A
= +70
°
C)
24-Pin 4mm x 4mm Thin QFN
(derate 20.8mW/
°
C above +70
°
C) .............................1667mW
Short-Circuit Duration (MAIN, POS, NEG)..................Continuous
Operating Temperature Range ...........................-40
°
C to +85
°
C
J unction Temperature......................................................+150
°
C
Storage Temperature Range.............................-65
°
C to +150°C
Lead Temperature (soldering, 10s) ................................ +300
°
C
MIN
2.7
TYP
MAX
5.5
UNITS
V
IN Undervoltage-Lockout (UVLO)
Threshold
Rising edge, 30mV hysteresis
2.1
2.35
2.6
V
IN Quiescent Current
Switching
3
5
1
mA
T
A
= +25°C
T
A
= +85°C
0.4
1
+160
IN Shutdown Current
V
CTRL
= V
ONBIAS
= 0V
μA
Thermal Shutdown
MAIN CHARGE PUMP WITH LINEAR REGULATOR
Main Pump Efficiency
Rising temperature, 20°C hysteresis (typ)
°C
I
LOAD
= 25mA, V
IN
= 3.9V
V
IN
≥
3.8V in 1.5x mode
V
IN
≥
3.0V in 2.0x mode
83
9
7.5
250
5.5
3.85
3.9
%
20
20
300
5.7
3.95
4.0
V
DD
Charge-Pump Open-Loop
Output Impedance
Operating Frequency
V
DD
Output Voltage
V
IN
Fal ng S w chover to 2.0x M od e
V
IN
Ri si ng S w chover to 1.5x M od e
Quiescent Current
(Charge Pumps Only)
200
5.2
3.75
3.8
kHz
V
V
V
Charge-pump pause threshold
V
CTRL
= 0V, ONBIAS = IN
0.87
1.30
mA
V
MAIN
Regulation Voltage
Discharge Switch Resistance
at V
MAIN
POS, NEG CHARGE PUMPS
Operating Frequency
Duty Cycle
POS Pump Efficiency
POS Output Voltage
P OS D schar g e S w ch Resi stance
NEG Pump Efficiency
0.1mA < I
LOAD
< 25mA
4.9
5.0
5.1
V
V
ONBIAS
= 0V
1
3
k
12.0
15.6
50
97
14.7
3
97
19.5
kHz
%
%
V
k
%
I
LOAD
= 100μA
I
LOAD
= 0 to 100μA
V
ONBIAS
= 0V
I
LOAD
= -100μA
13.9
15.3
6
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