Datasheet

cathode of a string of LEDs connected in series. The
constant-current capability is up to 55mA per output,
set for all 16 outputs by an external resistor, R
SET
. The
device can operate in a stand-alone mode (see the
Typical Operating Circuits).
The number of channels can be expanded by using the
MAX6970 and MAX6971 family in conjunction with the
MAX16809.
Figure 1a. Internal Block Diagram
2R
R
26.5V
EN_REF
BG
SNS
300mV
UVLO
I
LIM
VEA
CPWM
VOLTAGE-
DIVIDER
V
DD
THERMAL
SHUTDOWN
VOLTAGE
DIVIDER
OSC
CLK
PREREG
5V
REG_OK
5V REG
REFERENCE
2.5V
DELAY
S
R
Q
Q
V
CC
V+
CURRENT
REFERENCE
POWER-ON
RESET
THERMAL
SHUTDOWN
AGND
CS
V
CC
REF
OUT
RTCT
DOUT
V+
SET
FB
COMP
CLK
DIN
LE
OE
D0 D1 D2 D3 D4 D5 D6 D7
D0 D1 D2 D3 D4 D5 D6 D7
D0 D1 D2 D3 D4 D5 D6 D7
OUT0 OUT1 OUT2 OUT3 OUT4 OUT5 OUT6 OUT7
D8 D9 D10 D11 D12 D13 D14 D15
D8 D9 D10 D11 D12 D13 D14 D15
D8 D9 D10 D11 D12 D13 D14 D15
OUT8 OUT9
OUT10
OUT11
OUT12 OUT13 OUT14 OUT15
PGND
MAX16809
SERIAL-TO-PARALLEL SHIFT REGISTER
OUTPUT LATCHES
CONSTANT-CURRENT SINK
www.maximintegrated.com
Maxim Integrated │ 12
MAX16809 Integrated 16-Channel LED Driver with
Switch-Mode Boost and SEPIC Controller