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9-Output LED Driver with Intensity Control
and Hot-Insertion Protection
V SUPPLY is the supply voltage used to drive the LED (V).
V LED is the forward voltage of the LED (V).
V OL is the output low voltage of the MAX6964 when
sinking I LED (V).
I LED is the desired operating current of the LED (A).
For example, to operate a 2.2V red LED at 14mA from a
5V supply, R LED = (5 - 2.2 - 0.25) / 0.014 = 182 ? .
0.047 μ F
2V TO 3.6V
V+
7V
Driving Load Currents Higher than 50mA
The MAX6965 can be used to drive loads drawing more
μ C
MAX6965
O0
O1
than 50mA, like relays and high-current white LEDs, by
paralleling outputs. Use at least one output per 50mA of
load current; for example, a 6V 330mW relay draws
55mA and needs two paralleled outputs to drive it.
Ensure that the paralleled outputs chosen are controlled
SDA
SCL
I/O
I/O
SDA
SCL
BLINK
RST
O2
O3
O4
O5
O6
BAS16
by the same blink phase register, i.e., select outputs from
O7
the O0 through O7 range. This way, the paralleled out-
puts are turned on and off together. Do not use output
O8 as part of a load-sharing design. O8 cannot be
AD0
GND
O8
switched at the same time as any of the other outputs
because it is controlled by a different register.
Figure 19. Diode-Protected Switching Inductive Load
Table 9. PWM Intensity Settings (Blink Disabled)
OUTPUT
(OR
GLOBAL)
INTENSITY
PWM DUTY CYCLE
OUTPUT BLINK PHASE 0
REGISTER BIT = 0
LED BEHAVIOR WHEN
OUTPUT BLINK PHASE 0
REGISTER BIT = 0
(LED IS ON WHEN
PWM DUTY CYCLE
OUTPUT BLINK PHASE 0
REGISTER BIT = 1
LED BEHAVIOR WHEN
OUTPUT BLINK PHASE 0
REGISTER BIT = 1
(LED IS ON WHEN
SETTING
0x0
0x1
0x2
0x3
0x4
0x5
0x6
0x7
0x8
0x9
0xA
0xB
0xC
0xD
0xE
0xF
LOW TIME
1/16
2/16
3/16
4/16
5/16
6/16
7/16
8/16
9/16
10/16
11/16
12/16
13/16
14/16
15/16
Static low
HIGH TIME
15/16
14/16
13/16
12/16
11/16
10/16
9/16
8/16
7/16
6/16
5/16
4/16
3/16
2/16
1/16
Static low
OUTPUT IS LOW)
Lowest PWM intensity
Highest PWM intensity
Full intensity, no PWM
(LED on continuously)
LOW TIME
15/16
14/16
13/16
12/16
11/16
10/16
9/16
8/16
7/16
6/16
5/16
4/16
3/16
2/16
1/16
Static high
impedance
HIGH TIME
1/16
2/16
3/16
4/16
5/16
6/16
7/16
8/16
9/16
10/16
11/16
12/16
13/16
14/16
15/16
Static high
impedance
OUTPUT IS LOW)
Highest PWM intensity
Lowest PWM intensity
LED off continuously
16
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