LM3554TME/NOPB National Semiconductor, LM3554TME/NOPB Datasheet - Page 5

• 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

Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of
the device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see
the Electrical Characteristics table.
Note 2: All voltages are with respect to the potential at the GND pin.
Note 3: Internal thermal shutdown circuitry protects the device from permanent damage. Thermal shutdown engages at T
T
Note 4: For detailed soldering specifications and information, please refer to National Semiconductor Application Note 1112: Micro SMD Wafer Level chip Scale
Package (AN-1112)
Note 5: In applications where high power dissipation and/or poor package thermal resistance is present, the maximum ambient temperature may have to be
derated. Maximum ambient temperature (T
dissipation of the device in the application (P
following equation: T
Note 6: Junction-to-ambient thermal resistance (θ
JEDEC standard JESD51-7. The test board is a 4-layer FR-4 board measuring 102mm x 76mm x 1.6mm with a 2x1 array of thermal via's. The ground plane on
the board is 50mm x 50mm. Thickness of copper layers are 36µm/18µm/18µm/36µm (1.5oz/1oz/1oz/1.5oz). Ambient temperature in simulation is 22°C, still air.
Power dissipation is 1W.
Note 7: Min and Max limits are guaranteed by design, test, or statistical analysis. Typical (Typ) numbers are not guaranteed, but do represent the most likely
norm. Unless otherwise specified, conditions for typical specifications are: V
Note 8: The typical curve for Over-Voltage Protection (OVP) is measured in closed loop using the typical application circuit . The OVP value is found by forcing
an open circuit in the LED1 and LED2 path and recording the peak value of V
by ramping the voltage at OUT until the OVP comparator trips. The closed loop data can appear higher due to the stored energy in the inductor being dumped
into the output capacitor after the OVP comparator trips. At worst case is an open circuit condition where the output voltage can continue to rise after the OVP
comparator trips by approximately I
Note 9: The typical curve for Current Limit is measured in closed loop using the typical application circuit by increasing I
increasing. The value given in the Electrical Table is measured open loop and is found by forcing current into SW until the current limit comparator threshold is
reached. Closed loop data appears higher due to the delay between the comparator trip point and the NFET turning off. This delay allows the closed loop inductor
current to ramp higher after the trip point by approximately 20ns × V
Note 10: Current Matching = Absolute Value((I
Note 11: Current Accuracy = Absolute Value(I
J
=135°C (typ.).
A-MAX
= T
J-MAX-OP
IN
×sqrt(L/C
– (θ
JA
A-MAX
× P
D-MAX
OUT
TARGET
LED1
D-MAX
) is dependent on the maximum operating junction temperature (T
).
), and the junction-to-ambient thermal resistance of the part/package in the application (θ
JA
- I
) is taken from a thermal modeling result, performed under the conditions and guidelines set forth in the
).
- (I
LED2
LED1
)/(I
LED1
+ I
LED2
+ I
FIGURE 1. I
)) × 100
IN
LED2
/L
)) × 100
IN
OUT
= 3.6V and T
5
2
. The value given in the Electrical Table is found in an open loop configuration
C Timing
A
= +25°C.
J-MAX-OP
OUT
J
=150°C (typ.) and disengages at
= +125°C), the maximum power
until the peak inductor current stops
30042004
JA
), as given by the
www.national.com