The LTC3454 is a synchronous buck-boost DC/DC converter optimized for driving a single high power LED at currents up to 1A from a single cell Li-Ion battery in- put. The regulator operates in either synchronous buck, synchronous boost, or buck-boost mode depending on input voltage and LED forward voltage. PLED/PIN effi ciency greater than 90% can be achieved over the entire usable range of a Li-Ion battery (2.7V to 4.2V).
The LTC3454 is a synchronous buck‑boost DC/DC converter optimized for driving a single high‑power LED from a single‑cell Li‑Ion battery. It operates in buck, boost or buck‑boost mode over a wide input range and provides up to 1 A continuous LED current with efficiency greater than 90 %.
The device is offered in a low‑profile 10‑lead (3 mm × 3 mm) DFN package and includes features such as programmable LED current, soft‑start, over‑temperature protection, undervoltage lockout and short‑circuit protection. Detailed electrical characteristics, pin descriptions and application guidelines are provided.
| Input Supply Voltage (VIN) | 2.7 V – 5.5 V |
|---|---|
| Maximum Continuous LED Current | 1 A |
| Oscillator Frequency | 0.9 MHz – 1.15 MHz (typ. 1 MHz) |
| Efficiency | >90 % (typical) |
| Package | 10‑lead (3 mm × 3 mm) DFN |
| Soft‑Start Time | 200 µs |
The device operates from 2.7 V up to 5.5 V input.
It can deliver up to 1 A of continuous LED current.
The internal oscillator runs at about 1 MHz (typical range 0.9 MHz to 1.15 MHz).