MAX16826ATJ+ Maxim Integrated Products, MAX16826ATJ+ Datasheet - Page 9

• Manufacturer Part Number: MAX16826ATJ+
• Description: LED Drivers Programmable Four-St ring HB LED Driver w
• Manufacturer: Maxim Integrated Products

Specifications of MAX16826ATJ+

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Output-Voltage Optimization and Fault Detection
PIN
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
—
Programmable, Four-String HB LED Driver with
NAME
DR1
CS2
DR2
CS3
DR3
CS4
DR4
DL1
DL2
DL3
DL4
V
CS
DL
EP
IN
CC
_______________________________________________________________________________________
LE D S tr i ng 1 Li near C ur r ent S our ce O utp ut. D L1 d r i ves the g ate of the exter nal FE T on LE D S tr i ng 1 and has
ap p r oxi m atel y 15m A sour ce/si nk cap ab i l i ty. C onnect a m i ni m um cap aci tor of 4700p F fr om D L1 to G N D to
com p ensate the i nter nal tr anscond uctance am p l i fi er as w el l as p r og r am the r i se and fal l ti m es of the LE D cur r ents.
LED String 1 External FET Drain Voltage Sense. The internal ADC uses this input to measure the drain to GND
voltage of the current sink FET. Drain voltage measurement information can be read back from the I
interface. Connect a voltage-divider to scale drain voltage as necessary.
LED String 2 Current-Sense Input. CS2 is regulated to a value set by an internal register. The regulation voltage
can be set between 97mV and 316mV.
LED String 2 Linear Current Source Output. DL2 drives the gate of the external FET on LED String 2 and has
approximately 15mA source/sink capability. Connect a minimum capacitor of 4700pF from DL2 to GND to
compensate the internal transconductance amplifier, as well as program the rise and fall times of the LED
currents.
LED String 2 External FET Drain Voltage Sense. The internal ADC uses this input to measure the drain to GND
voltage of the current sink FET. Drain voltage measurement information can be read back from the I
interface. Connect a voltage-divider to scale drain voltage as necessary.
LED String 3 Current-Sense Input. CS3 is regulated to a value set by an internal register. The regulation voltage
can be set between 97mV and 316mV.
LE D S tr i ng 3 Li near C ur r ent S our ce O utp ut. D L3 d r i ves the g ate of the exter nal FE T on LE D S tr i ng 3 and has
ap p r oxi m atel y 15m A sour ce/si nk cap ab i l i ty. C onnect a m i ni m um cap aci tor of 4700p F fr om D L3 to G N D to
com p ensate the i nter nal tr anscond uctance am p l i fi er , as w el l as p r og r am the r i se and fal l ti m es of the LE D cur r ents.
LED String 3 External FET Drain Voltage Sense. The internal ADC uses this input to measure the drain to GND
voltage of the current sink FET. Drain voltage measurement information can be read back from the I
interface. Connect a voltage-divider to scale drain voltage as necessary.
LED String 4 Current-Sense Input. CS4 is regulated to a value set by an internal register. The regulation voltage
can be set between 97mV and 316mV.
LE D S tr i ng 4 Li near C ur r ent S our ce O utp ut. D L3 d r i ves the g ate of the exter nal FE T on LE D S tr i ng 4 and has
ap p r oxi m atel y 15m A sour ce/si nk cap ab i l i ty. C onnect a m i ni m um cap aci tor of 4700p F fr om D L4 to G N D to
com p ensate the i nter nal tr anscond uctance am p l i fi er , as w el l as p r og r am the r i se and fal l ti m es of the LE D cur r ents.
LED String 4 External FET Drain Voltage Sense. The internal ADC uses this input to measure the drain to GND
voltage of the current sink FET. Drain voltage measurement information can be read back from the I
interface. Connect a voltage-divider to scale drain voltage as necessary.
Power Supply. IN is internally connected to a 26V shunt regulator that sinks current. In conjunction with an
external resistor it allows time-limited load dump events as high as 40V to be safely handled by the IC. Bypass
IN to GND with a minimum 10µF capacitor.
Current-Sense Input
Gate Driver Regulator Output. Bypass V
pulses come from the capacitor connected to V
powered by a voltage less than 5.5V, connect V
Switching Regulator Gate Driver Output
Exposed Pad. Connect the exposed pad to the ground plane for heatsinking. Do not use this pad as the only
ground connection to the IC.
CC
to GND with a minimum 4.7µF ceramic capacitor. Gate drive current
CC
CC
FUNCTION
. Place the capacitor as close as possible to V
directly to IN.
Pin Description (continued)
CC
. If IN is
2
2
2
2
C
C
C
C
9