MAX16807AUI datasheet(12/21 Pages) MAXIM

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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, RSET. 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.

26.5V

EN_REF

SNS

300mV

UVLO

ILIM

VEA

CPWM

VOLTAGE-

DIVIDER

VDD

THERMAL

SHUTDOWN

VOLTAGE

DIVIDER

OSC

CLK

PREREG

REG_OK

5V REG

REFERENCE

2 5V

DELAY

VCC

V+

CURRENT

REFERENCE

POWER-ON

RESET

THERMAL

SHUTDOWN

CONSTANT-CURRENT SINK

OUTPUT LATCHES

SERIAL-TO-PARALLEL SHIFT REG STER

AGND

VCC

REF

OUT

RTCT

DOUT

V+

SET

COMP

CLK

DIN

PGND

MAX16807

Figure 1a. Internal Block Diagram (MAX16807)

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