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LM3557

Features: 1.25 MHz Constant-Switching FrequencyOutput Over-Voltage ProtectionInput Under-Voltage ProtectionCycle-By-Cycle Current LimitTRUE SHUTDOWN: No DC current paths to ground during shutdownLow Profile Package: <1 mm Height -8 Pin LLPNo External CompensationApplication White LED Display L...

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SeekIC No. : 004395381 Detail

LM3557: Features: 1.25 MHz Constant-Switching FrequencyOutput Over-Voltage ProtectionInput Under-Voltage ProtectionCycle-By-Cycle Current LimitTRUE SHUTDOWN: No DC current paths to ground during shutdownLo...

LM3557 Data Sheet

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Part Number:
LM3557
Supply Ability:
5000

Price Break

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

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Product Details

Description



Features:

1.25 MHz Constant-Switching Frequency
Output Over-Voltage Protection
Input Under-Voltage Protection
Cycle-By-Cycle Current Limit
TRUE SHUTDOWN: No DC current paths to ground during shutdown
Low Profile Package: <1 mm Height -8 Pin LLP
No External Compensation




Application

White LED Display Lighting
Cellular Phones
PDAs




Pinout

Connection Diagram




Specifications

Regulated LEDs 5
Boost Type Inductive
Switching Frequency 1250 kHz
Input Min Voltage 2.7 Volt
Input Max Voltage 7.5 Volt
OutputMax Voltage 22 Volt
LED Configuration Parallel
PWM BrightCtrl No
Analog-V BrightCtrl No
Ambient Light Compensation No
RGB-LED No
Temperature Min -40 deg C
Temperature Max 85 deg C
RegType Switching Regulator
PowerWise Yes
View Using Catalog


VIN Pin
En Pin
Fb Pin
Sw2 Pin
Ovp Pin
Sw1 Pin
Continuous Power Dissipation
Maximum Junction Temperature
(TJ-MAX)
Storage Temperature Range
ESD Rating (Note 2)
Human Body Model
Machine Model		 −0.3V to +8V
−0.3V to +8V
−0.3V to +8V
−0.3V to +8V
−0.3V to +30V
−0.3V to +40V
Internally Limited

+150°C
−65°C to +150°C

2 kV
150V





Description

The LM3557 is a complete solution for white LED drive applications. With minimal external component count, no DC current leakage paths to ground, cycle-by-cycle current limit protection, and output over-voltage protection circuitry, the LM3557 offer superior performance and cost savings over standard DC/DC boost component implementations.

The LM3557 switches at a fixed-frequency of 1.25 MHz, which allows for the use of small external components. Also, the LM3557 has a wide input voltage range to take advantage of multi-cell input applications. With small external components, high fixed frequency operation, and wide input voltage range, the LM3557 is the most optimal choice for LED lighting applications.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM3557SD-2 ABCD150 0 31520 0 0 3739000 1 1060951459
LM3557SDX-2 ABCD150 0 31520 0 0 3739000 1 1060951459

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


More Application Notes

Title Size in Kbytes Date
AN-1495: Application Note 1495 LM3552 White LED Flash Driver Evaluation Board 626 Kbytes 27-Sep-06 Download
AN-1495 (Chinese): Application Note 1495 LM3552 White LED Flash Driver Evaluation Board
 208 Kbytes 640){this.height=this.height*640/this.width;this.width=640;}' border="0" alt=" Connection Diagram">
AN-1780: Application Note 1780 LM3553 1.2A Dual Flash LED Driver System with I2C Compatible Interface 1427 Kbytes 12-Mar-08 Download

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