MAX16816 Maxim Integrated Products, MAX16816 Datasheet - Page 13

• Manufacturer Part Number: MAX16816
• Description: Programmable Switch-Mode LED Driver
• Manufacturer: Maxim Integrated Products

PIN
EP
21
22
23
25
26
27
28
29
30
31
32
FAULT
NAME
QGND
CLMP
REG2
SNS-
DGT
CS+
V
CS-
LO
EP
HI
CC
______________________________________________________________________________________
Programmable Switch-Mode LED Driver
Negative Peak Current-Sense Input. Connect SNS- to the negative side of the switch current-sense resistor,
R
Analog Ground. Ensure a low-impedance connection between QGND and AGND.
Dimming Gate-Driver Output. Connect DGT to the gate of an external n-channel MOSFET for dimming. DGT
is powered by the internal regulator, CLAMP, and is referenced to LO.
Low-Voltage Input. LO is the return point for the LED current. When using the MAX16816 in a buck-boost
configuration, connect LO to V
AGND. Connect LO to the junction of the inductor and LED current-sense resistor, R
configuration.
Noninverting Current-Sense Amplifier Input. Connect CS+ to the positive side of an external sense resistor,
R
Inverting Current-Sense Amplifier Input. Connect CS- to the negative side of an external sense resistor, R
connected in series with the load (LEDs).
Internal CLAMP Regulator Bypass. CLAMP supplies an 8V (typ) output when V
9V, V
provides the high reference for the dimming driver. V
the current-sense amplifier and dimming MOSFET driver. Bypass CLMP to LO with a 0.1µF ceramic
capacitor.
High-Voltage Input. HI is referred to LO. HI supplies power to the current-sense amplifier and dimming
MOSFET gate driver through the CLMP regulator.
Internal Regulator Output. REG2 is an internal voltage regulator that generates EEPROM-programmable
(5V to 15V) output and supplies power to internal circuitry. Connect REG2 to DRI to power the switching
MOSFET driver during normal operation. Bypass REG2 to AGND with a 10µF ceramic capacitor.
Supply Voltage Input
FAULT Input/Output. FAULT is a bidirectional high-voltage logic input/output. FAULT multiplexes a 1-Wire
programming interface with a fault indicator. FAULT is internally pulled up to 5V through a 10kΩ resistor and
a 1.8mA (max) current pulldown to ground.
Exposed Pad. Connect EP to AGND. EP also functions as a heatsink to maximize thermal dissipation. Do not
use as the main ground connection.
SENSE
CS
with Analog-Controlled PWM Dimming
, connected in series with the load (LEDs).
CLMP
.
is one diode drop below V
CC
. When using the device in a boost configuration only, connect LO to
HI
. The CLAMP regulator powers the current-sense amplifier and
FUNCTION
CLMP
must be at least 2.5V higher than V
Pin Description (continued)
HI
≥ 9V. If V
CS
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, when using a buck
HI
is lower than
LO
to enable
CS
13
,