MAX16808 Maxim Integrated Products, MAX16808 Datasheet - Page 12

• Manufacturer Part Number: MAX16808
• Description: (MAX16807 / MAX16808) Integrated 8-Channel LED Drivers
• Manufacturer: Maxim Integrated Products

ode of a string of LEDs connected in series. The con-
stant-current capability is up to 55mA per output, set
for all 8 outputs by an external resistor, R
devices can operate in a stand-alone mode (see the
Typical Operating Circuits .)
Integrated 8-Channel LED Drivers with
Switch-Mode Boost and SEPIC Controller
Figure 1a. Internal Block Diagram (MAX16807)
12
______________________________________________________________________________________
COMP
AGND
CLK
DIN
CS
FB
OE
LE
SHUTDOWN
THERMAL
MAX16807
VEA
D0
D0
D0
DELAY
REFERENCE
2.5V
300mV
D1
D1
D1
REG_OK
I
LIM
D2
D2
D2
SET
PREREG
2R
SERIAL-TO-PARALLEL SHIFT REGISTER
5V
CONSTANT-CURRENT SINK
. The
D3
D3
D3
OUTPUT LATCHES
R
CPWM
SHUTDOWN
THERMAL
D4
D4
D4
The MAX16808 includes circuitry that automatically
detects open-circuit LEDs. Fault status is loaded into the
serial-interface shift register when LE goes high and is
automatically shifted out on DOUT when the next data
transmission is shifted in. The number of channels can be
expanded by using the MAX6970 and MAX6971 family in
conjunction with the MAX16807 and MAX16808.
CLK
D5
D5
D5
UVLO
EN_REF
BG
SNS
OSC
VOLTAGE
DIVIDER
5V REG
D6
D6
D6
V
Q
DD
D7
D7
D7
S
R
Q
VOLTAGE-
DIVIDER
PGND
REFERENCE
POWER-ON
CURRENT
RESET
V+
26.5V
V
CC
V
REF
OUT
RTCT
DOUT
V+
SET
CC