MAX16816ATJ+T Maxim Integrated Products, MAX16816ATJ+T Datasheet - Page 24

• Manufacturer Part Number: MAX16816ATJ+T
• Description: IC LED DRIVR HIGH BRIGHT 32-TQFN
• Manufacturer: Maxim Integrated Products
• Type: HBLED Driverr

Specifications of MAX16816ATJ+T

• Topology: PWM, SEPIC, Step-Down (Buck), Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Automotive
• Type - Secondary: High Brightness LED (HBLED)
• Frequency: 125kHz ~ 500kHz
• Voltage - Supply: 5.5 V ~ 76 V
• Mounting Type: Surface Mount
• Package / Case: 32-TQFN Exposed Pad
• Operating Temperature: -40°C ~ 125°C
• Internal Switch(s): Yes
• Efficiency: 90%
• Low Level Output Current: 76 mA
• High Level Output Current: 67 mA
• Operating Supply Voltage: 5.5 V to 76 V
• Maximum Supply Current: 4.5 mA
• Maximum Power Dissipation: 2758 mW
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Current - Output / Channel: -
• Lead Free Status / Rohs Status: Details

Careful PCB layout is critical to achieve low switching
losses and clean, stable operation. Use a multilayer
board whenever possible for better noise performance
and power dissipation. Follow these guidelines for
good PCB layout:
Table 10. MAX16816 1-Wire Function Commands
Programmable Switch-Mode LED Driver
with Analog-Controlled PWM Dimming
24
PASS_CODE_ONE
PASS_CODE_TWO
EXT_EEM_MODE
SET_WRITE_EE
SET_WRITE_SCH
SET_READ_SCH
• Use a large copper plane under the MAX16816
• Isolate the power components and high current
• Keep the high-current paths short, especially at the
• Connect AGND, SGND, and QGND to a ground
• Keep the power traces and load connections
• Ensure that the feedback connection to FB is short
• Route high-speed switching nodes away from the
• To prevent discharge of the compensation capaci-
______________________________________________________________________________________
package. Ensure that all heat-dissipating compo-
nents have adequate cooling. Connect the
exposed pad of the device to the ground plane.
paths from sensitive analog circuitry.
ground terminals. This practice is essential for sta-
ble, jitter-free operation. Keep switching loops short.
plane. Ensure a low-impedance connection
between all ground points.
short. This practice is essential for high efficiency.
Use thick copper PCBs (2oz vs. 1oz) to enhance
full-load efficiency.
and direct.
sensitive analog areas.
tors, C
cycle, ensure that the PCB area close to these
components has extremely low leakage.
Discharge of these capacitors due to leakage may
result in degraded dimming performance.
COMMAND
1
and C
2
, during the off-time of the dimming
ADD
D7
0
0
0
0
0
ADD
D6
0
0
0
0
0
ADD
D5
1
0
0
0
0
DATA BIT CODE
ADD
EEPROM implementation uses a 1-Wire communica-
tion method. A 1-Wire net-based system consists of
three main elements: a bus master with controlling
software, the wiring and associated connectors, and
1-Wire devices. Data on the 1-Wire net is transferred
with respect to time slots. For example, the master pulls
the bus low and holds it for 15µs or less to write a logic
‘1’, and holds the bus low for at least 60µs to write a
logic ‘0’. During EEPROM programming the MAX16816
is a 1-Wire slave device only. Data and clock signals
are supplied through FAULT.
Table 10 shows the list of 1-Wire function commands
for the MAX16816. Use these commands to start the
programming mode, write to the on-chip EEPROM, and
read EEPROM through the 1-Wire interface.
PASS_CODE_ONE: The PASS_CODE_ONE sequence
is the first code that the MAX16816 must receive from
the master. PASS_CODE_ONE must be received within
the initial 8ms programming window after startup.
PASS_CODE_TWO: The PASS_CODE_TWO sequence
is the second code that the MAX16816 must receive
during the 8ms programming window. The MAX16816
will start searching for PASS_CODE_TWO only after
PASS_CODE_ONE has been received.
EXT_EEM_MODE: The EXT_EEM_MODE command
clears the PASS_CODE_ONE and PASS_CODE_TWO
verification register. Use this command to exit program-
ming mode.
SET_WRITE_EE: The SET_WRITE_EE command is the
write all command for the MAX16816. When the device
detects the SET_WRITE_EE command the write
D4
0
0
0
0
0
MAX16816 1-Wire Function Commands
DATA
D3
1
1
0
0
0
DATA
D2
0
0
0
1
1
DATA
1-Wire Interface
D1
0
0
0
0
1
DATA
D0
1
1
1
0
0
CODE
HEX
29h
09h
01h
04h
06h
—