Pinout
Specifications| Regulated LEDs | 4 |
| Boost Type | Inductive |
| Switching Frequency | 1100 kHz |
| Input Min Voltage | 2.7 Volt |
| Input Max Voltage | 5.5 Volt |
| OutputMax Voltage | 22.2 Volt |
| Special Features | 4 to 5 LEDs plus OLED subdisplay |
| 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 |
DescriptionThe LM3520 is a dual step-up DC/DC converter, designed to drive up to 5 white LEDs with a constant current and to power an organic LED display with a constant voltage.
A single external resistor is used to set the maximum LED current. The LED current can be adjusted by applying a PWM signal to the EN pin. For higher efficiency the LM3520 operates with pulse frequency modulation (PFM) control scheme when the sub-display is enabled. When Main display is enabled, the device is operating in PWM mode.
Overvoltage protection circuitry and a 1MHz switching frequency allow for the use of small, low cost external components.
Additional features include a low-side NFET switch that can turn off the LED string with no DC current path to ground.
The LM3520 is available in a small 14-pin thermally-enchanced LLP package.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
| LM3520SD |
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 |
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| AN-292: Application Note 292 Applications of the LM3524 Pulse-Width-Modulator |
239 Kbytes |
3-Oct-02 |
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| AN-715: Application Note 715 LM385 Feedback Provides Regulator Isolation |
50 Kbytes |
3-Oct-02 |
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| AN-1823: Application Note 1823 LM3528 Evaluation Board |
869 Kbytes |
4-Aug-08 |
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| AN-272: Application Note 272 Op Amp Booster Designs |
382 Kbytes |
2-Oct-02 |
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| AN-288: Application Note 288 System-Oriented DC-DC Conversion Techniques |
405 Kbytes |
3-Oct-02 |
Download |
| AN-293: Application Note 293 Control Applications of CMOS DACs |
385 Kbytes |
4-Oct-04 |
Download |
| AN-694: Application Note 694 A DMOS 3A, 55V, H-Bridge: The LMD18200 |
408 Kbytes |
26-Sep-02 |
Download |
AN-694 (Japanese): Application Note 694 A DMOS 3A, 55V, H-Bridge: The LMD18200
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400 Kbytes |
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LM3520 Data Sheet
