LM3551SDX, LM3552, LM3552SD Selling Leads, Datasheet
MFG:NSC Package Cooled:QFN D/C:0706+
LM3551SDX, LM3552, LM3552SD Datasheet download
Part Number: LM3551SDX
MFG: NSC
Package Cooled: QFN
D/C: 0706+
LM3551SDX, LM3552, LM3552SD
- Table of contents:
Info of LM3551SDX
Info of LM3552
Info of LM3552SD
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About LM3551SDX
PDF/DataSheet Download
Datasheet: LM3551SDX
File Size: 774666 KB
Manufacturer: NSC [National Semiconductor]
Download : Click here to Download
About LM3552
PDF/DataSheet Download
Datasheet: LM3552
File Size: 774144 KB
Manufacturer: NATIONAL
Download : Click here to Download
About LM3552SD
PDF/DataSheet Download
Datasheet: LM3552SD
File Size: 774666 KB
Manufacturer: NSC [National Semiconductor]
Download : Click here to Download
LM3552 General Description
The LM3551 and LM3552 are fixed frequency, current mode step-up DC/DC converters with two integrated NFETs that can be used for precision LED brightness control. The devices are capable of driving loads up to 1A from a single-cell Li-Ion battery.
The LM3551 and LM3552 can drive one or more high current flash LEDs either in a high power Flash mode or a lower
power Torch mode using the TORCH/FLASH pin. A programmable Timeout function on the FTO pin forces the internal NFETs to turn off after a certain user defined time. Anexternal SD pin (LM3551) or EN pin (LM3552) is available to put the device into low power shutdown mode. During shutdown, the feedback resistors and the load are disconnected from the input to avoid leakage current paths to ground. User programmable soft-start circuitry has been integrated
to eliminate large inrush currents at start-up. Over-voltage protection circuitry and a 1.25MHz switching frequency allow for the use of small, low-cost output capacitors with lower voltage ratings.
The LM3551 and LM3552 are available in a low profile 14 pin LLP package.
LM3552 Maximum Ratings
VIN pin: Voltage to GND ....................7.5V
SW pin: Voltage to GND.................... 21V
FB pin: Voltage to GND...................... 7V
VC pin: Voltage to GND ............... 1.26V ± 0.3V
SD,T/F pins: Voltage to GND ................ 7.5V
FET-T, FET-F: Voltage to GND.................. 6V
Continuous Power Dissipation (Note 3) ..Internally Limited
Junction Temperature (TJ-MAX ).............. 150°C
Storage Temperature Range .......... -65°C to +150
Maximum Lead Temperature
(Soldering) ........................ (Note 4)
ESD Rating..........................(Note 5)
Human Body Model ......................2.0kV
SW pin: Voltage to GND.................... 21V
FB pin: Voltage to GND...................... 7V
VC pin: Voltage to GND ............... 1.26V ± 0.3V
SD,T/F pins: Voltage to GND ................ 7.5V
FET-T, FET-F: Voltage to GND.................. 6V
Continuous Power Dissipation (Note 3) ..Internally Limited
Junction Temperature (TJ-MAX ).............. 150°C
Storage Temperature Range .......... -65°C to +150
Maximum Lead Temperature
(Soldering) ........................ (Note 4)
ESD Rating..........................(Note 5)
Human Body Model ......................2.0kV
LM3552 Features
· Up to 1A total drive current
·Flash timeout protection
· Independent Torch/Flash/Shutdown modes
· LED disconnect in shutdown
· Programmable soft-start limits inrush current
· Over-voltage protection
· Wide voltage range 2.7 to 5.5V
· 1.25MHz constant switching frequency
· Small, low profile package, non-pullback LLP14 (4mm x 4mm)
·Flash timeout protection
· Independent Torch/Flash/Shutdown modes
· LED disconnect in shutdown
· Programmable soft-start limits inrush current
· Over-voltage protection
· Wide voltage range 2.7 to 5.5V
· 1.25MHz constant switching frequency
· Small, low profile package, non-pullback LLP14 (4mm x 4mm)
LM3552 Typical Application
· White LED Camera Flash
· White LED Torch (Flashlight)
· DSC (Digital Still Camera) Flash
· Cellular Camera Phone Flash
· PDA Camera Flash
·Camcorder Torch (Flashlight) lamp
· White LED Torch (Flashlight)
· DSC (Digital Still Camera) Flash
· Cellular Camera Phone Flash
· PDA Camera Flash
·Camcorder Torch (Flashlight) lamp
LM3552 Connection Diagram
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