LM3554TME/NOPB National Semiconductor, LM3554TME/NOPB Datasheet - Page 31

• Manufacturer Part Number: LM3554TME/NOPB
• Description: IC LED DVR PHOTO FLASH 16-USMD
• Manufacturer: National Semiconductor
• Type: Photo Flash LED (I²C Interface)r

Specifications of LM3554TME/NOPB

• Constant Current: Yes
• Topology: High Side, Step-Up (Boost)
• Number Of Outputs: 2
• Internal Driver: Yes
• Type - Primary: Flash/Torch
• Type - Secondary: White LED
• Frequency: 2MHz
• Voltage - Supply: 2.7 V ~ 5.5 V
• Voltage - Output: 5V
• Mounting Type: Surface Mount
• Package / Case: 16-MicroSMD
• Operating Temperature: -30°C ~ 85°C
• Current - Output / Channel: 600mA
• Internal Switch(s): Yes
• Efficiency: 90%
• Led Driver Application: LED Backlighting, Portable Electronics
• No. Of Outputs: 2
• Output Current: 1.2A
• Input Voltage: 2.7V To 5.5V
• Dimming Control Type: I2C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: LM3554TMETR

FLAGS REGISTER
The Flags Register holds the status of the flag bits indicating
LED Failure, Over-Temperature, the Flash Timeout expiring,
Monitor Fault
VIN has fallen
0=No Fault at
VIN (default)
programmed
enabled and
Monitor is
below the
Bit 7 (V
threshold
1=Input
Voltage
Fault)
IN
(Reads Back
(Unused)
Not Used
Bit 6
'1')
V
0=LEDI/NTC
1=LEDI/NTC
pin is above
TRIP
below V
(NTC mode
Bit 5 (LED
has fallen
Thermal
Fault)
only)
(default)
TRIP
FIGURE 19. Flags Register Description
TABLE 5. Flags Register Bit Settings
changed state
0=ENVM/TX2
1=ENVM/TX2
has changed
mode only)
Bit 4 (TX2
state (TX2
Interrupt)
(default)
has not
31
has not changed
pin has changed
state (TX1 mode
0=TX1/TORCH
1=TX1/TORCH
state (default)
Bit 3 (TX1
Interrupt )
VIN Monitor Fault, LED over temperature (NTC), and a TX
interrupt. (See
only)
Failed (Open
Figure 18
0 = Proper
Bit 2 (Led
Operation
(default)
1 = LED
or Short
Fault)
LED
and
Limit (default)
Table
Temperature
Temperature
has crossed
the Thermal
Shutdown)
Shutdown
Shutdown
Threshold
(Thermal
Thermal
0 = Die
1 = Die
below
Bit 1
4.)
30042024
Bit 0 (Flash
TimeOut did
not expire
Timeout)
0 = Flash
1 = Flash
(default)
TimeOut
Expired
www.national.com