MAX1984ETP Ver la hoja de datos (PDF) - Maxim Integrated
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MAX1984ETP Datasheet PDF : 17 Pages
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Ultra-High-Efficiency White
LED Drivers
PIN
MAX1984 MAX1985 MAX1986
16
16
12
17
17
13
18
18
14
19
19
15
20
20
16
NAME
BITA
BITC
IN
MODE
SEL
Pin Description (continued)
FUNCTION
Brightness Control Input (Multimode):
DPWM Mode: DPWM control signal input.
Analog Mode: Connect to IN.
2- or 3-Bit Parallel Mode: Digital input. Most significant bit (MSB).
Brightness Control Input:
DPWM Mode: Connect to IN.
Analog Mode: Connect to IN.
2-Bit Parallel Mode: Connect to GND.
3-Bit Parallel Mode: Digital input (LSB).
Input Supply. IN provides power to the internal control circuitry and MOSFET
drivers. Bypass IN to GND with a minimum 0.1µF ceramic capacitor.
Brightness Control Mode Selection Input. Connect MODE and BITC to IN for
DPWM control. Connect MODE, BITA, and BITC to IN for analog control. For 2-bit
parallel control, connect MODE to IN and BITC to ground. For 3-bit parallel control,
connect MODE to GND.
LED Selection Input. Connect SEL to IN to turn on all LEDs. Connect SEL to ground
to turn on only LED1–LED5 (MAX1984), LED1–LED4 (MAX1985), or LED1 to LED3
(MAX1986). Leave SEL unconnected or force to VIN/2 to turn on only LED6 to LED8
(MAX1984), LED3–LED6 (MAX1985), or LED4 (MAX1986).
C3
0.22µF
VIN
2.7V TO 5.5V
C1
2 x 2.2µF
L1
10µH
3
2
GND
LX
14 REF
C2
0.1µF
18
IN
OUT 1
VIN 13 SETI
MAX1984
LD1 4
D1
LD2 5
D2
16 BITA
6
D3
LD3
BRIGHTNESS
CONTROL
15 BITB
17 BITC
LD4 7
D4
LD5 9
D5
19 MODE
LD6 10
D6
LED SELECT 20 SEL
11
LD7
D7
8 LDG
LD8 12
D8
C4
2 x 2.2µF
Figure 1. Standard Application Circuit of the MAX1984
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