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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 pa...

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SeekIC No. : 004395378 Detail

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 pro...

LM3552 Data Sheet

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Part Number:
LM3552
Supply Ability:
5000

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  • Qty
  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



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)




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




Specifications

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

Regulated LEDs 4
Total LED Current 1000 mA
Boost Type Inductive
Switching Frequency 1250 kHz
Efficiency (peak) 93 %
Input Min Voltage 2.7 Volt
Input Max Voltage 5.5 Volt
LED Configuration Series
Current Matching Perfect
OutputMax Voltage 20 Volt
Supply Current 1.47 mA
Switching Type PWM
Special Features Up to 4 LEDs, Flash LED driver, timeout protection, active high enable
PWM BrightCtrl Yes
Analog-V BrightCtrl No
Ambient Light Compensation No
RGB-LED No
Temperature Min -40 deg C
Temperature Max 85 deg C
RegType WhiteLED Driver
PowerWise Yes
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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.






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