LM3556TME/NOPB
ActiveLM3556 1.5A INDUCTIVE WHITE LED CAMERA FLASH DEVICE
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LM3556TME/NOPB
ActiveLM3556 1.5A INDUCTIVE WHITE LED CAMERA FLASH DEVICE
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Technical Specifications
Parameters and characteristics for this part
| Specification | LM3556TME/NOPB |
|---|---|
| Applications | Camera Flash |
| Current - Output / Channel | 1.5 A |
| Dimming | I2C |
| Frequency | 4 MHz |
| Internal Switch(s) | True |
| Mounting Type | Surface Mount |
| Number of Outputs | 1 |
| Operating Temperature [Max] | 85 °C |
| Operating Temperature [Min] | -40 °C |
| Package / Case | 16-WFBGA, DSBGA |
| Supplier Device Package | 16-DSBGA |
| Topology | Step-Up (Boost) |
| Type | DC DC Regulator |
| Voltage - Supply (Max) | 5.5 V |
| Voltage - Supply (Min) [Min] | 2.5 V |
Pricing
Prices provided here are for design reference only. For realtime values and availability, please visit the distributors directly
| Distributor | Package | Quantity | $ | |
|---|---|---|---|---|
| Digikey | Cut Tape (CT) | 1 | $ 1.57 | |
| 10 | $ 1.41 | |||
| 25 | $ 1.33 | |||
| 100 | $ 1.14 | |||
| Digi-Reel® | 1 | $ 1.57 | ||
| 10 | $ 1.41 | |||
| 25 | $ 1.33 | |||
| 100 | $ 1.14 | |||
| Tape & Reel (TR) | 250 | $ 1.07 | ||
| 500 | $ 0.93 | |||
| 1250 | $ 0.77 | |||
| 2500 | $ 0.72 | |||
| 6250 | $ 0.69 | |||
| 12500 | $ 0.67 | |||
| Texas Instruments | SMALL T&R | 1 | $ 1.18 | |
| 100 | $ 0.98 | |||
| 250 | $ 0.70 | |||
| 1000 | $ 0.53 | |||
Description
General part information
LM3556 Series
The LM3556 is a 4-MHz fixed-frequency synchronous boost converter plus 1.5-A constant current driver for a high-current white LED. The high-side current source allows for grounded cathode LED operation providing flash current up to 1.5 A. An adaptive regulation method ensures the current source remains in regulation and maximizes efficiency.
The LM3556 is controlled via an I2C-compatible interface. Features include: a hardware flash enable (STROBE) allowing a logic input to trigger the flash pulse, a hardware torch enable (TORCH) for Movie Mode or flashlight functions, a TX input which forces the flash pulse into a low-current Torch Mode allowing for synchronization to RF power amplifier events or other high-current conditions, and an integrated comparator designed to monitor an NTC thermistor and provide an interrupt to the LED current. With a fast 1-μs transition from 0 mA to46.9 mA, the TORCH input pin can be used to develop custom LED current waveforms.
The 4-MHz switching frequency, overvoltage protection and adjustable current limit allow for the use of tiny, low-profile inductors and 10-µF ceramic capacitors. The device is operates over a −40°C to +85°C temperature range.
Documents
Technical documentation and resources
