LM3554TME/NOPB National Semiconductor, LM3554TME/NOPB Datasheet - Page 30

• 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

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FLASH DURATION REGISTER
Bits [4:0] of the Flash Duration Register set the Flash Timeout
duration. Bits [6:5] set the switch current limit. Bit [7] defaults
as a '1' and is not used (see
Reads Back '0' Current Limit Select Bits
Bit 7 (Not
used)
00 = 1A Peak Current Limit
01 = 1.5A Peak Current Limit
t10 = 2A Peak Current Limi
(default)
11 = 2.5A Peak Current Limit
Bit 6 (CL1)
Table
Bit 5 (CL0)
4).
FIGURE 18. Flash Duration Register Description
TABLE 4. Flash Duration Register Bit Settings
Flash Timeout Select Bits
00000 = 32ms timeout
00001 = 64ms timeout
00010 = 96ms timeout
00011 = 128ms timeout
00100 = 160ms timeout
00101 = 192ms timeout
00110 = 224ms timeout
00111 = 256ms timeout
01000 = 288ms timeout
01001 = 320ms timeout
01010 = 352ms timeout
01011 = 384ms timeout
01100 = 416ms timeout
01101 = 448ms timeout
01110 = 480ms timeout
01111 = 512ms timeout (default)
10000 = 544ms timeout
10001 = 576ms timeout
10010 = 608ms timeout
10011 = 640ms timeout
10100 = 672ms timeout
10101 = 704ms timeout
10110 = 736ms timeout
10111 = 768ms time-out
11000 = 800ms timeout
11001 = 832ms timeout
11010 = 864ms timeout
11011 = 896ms timeout
11100 = 928ms timeout
11101 = 960ms timeout
11110 = 992ms timeout
11111 = 1024ms timeout
Bit 4 (T4)
30
Bit 3 (T3)
Bit 2 (T2)
Bit 1 (T1)
30042023
Bit 0 (T0)