MAX16807_07 Datasheet, PDF (12/21 Pages) Maxim Integrated Products – Integrated 8-Channel LED Drivers with Switch-Mode Boost and SEPIC Controller

Integrated 8-Channel LED Drivers with
Switch-Mode Boost and SEPIC Controller
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_SET. The
devices can operate in a stand-alone mode (see the
Typical Operating Circuits.)
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.
AGND
CS
FB
COMP
MAX16807
REFERENCE
2.5V
PREREG
5V
DELAY
REG_OK
UVLO
THERMAL
SHUTDOWN
EN_REF ^VDD
BG 5V REG
SNS
VOLTAGE
DIVIDER
VOLTAGE-
DIVIDER
26.5V
300mV _ILIM
VCC
SQ
R
CPWM
2R
VEA
CLK
R
OSC Q
CLK
DIN
LE
OE
THERMAL
SHUTDOWN
SERIAL-TO-PARALLEL SHIFT REGISTER
D0
D1
D2
D3
D4
D5
D6
D7
OUTPUT LATCHES
D0
D1
D2
D3
D4
D5
D6
D7
CONSTANT-CURRENT SINK
D0
D1
D2
D3
D4
D5
D6
D7
POWER-ON
RESET
V+
CURRENT
REFERENCE
PGND
VCC
REF
OUT
RTCT
DOUT
V+
SET
Figure 1a. Internal Block Diagram (MAX16807)
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