Step-up LED driver regulates constant current for LED strings from battery-powered inputs. The device operates from 2.4 V to 5.5 V and supports output voltages up to 32 V. It integrates a 36 V, 400 mΩ low-side switch with 1.8 A cycle-by-cycle inductor peak current limiting. Fixed-frequency PWM operation runs at 500 kHz with skip mode, internal compensation, soft-start, UVLO, open-load protection and overtemperature protection. Package options include 5-lead SOT-23 and 2 mm x 3 mm 8-lead TDFN variants rated for -40°C to +125°C operation.
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| Function | High-voltage step-up LED driver |
| Topology | Non-synchronous boost converter |
| Input Voltage Min | 2.4V |
| Input Voltage Max | 5.5V |
| Output Voltage Max | 32V |
| Efficiency | Up to 92% |
| Switch Voltage Rating | 36V |
| Low-Side Switch On Resistance | 400mΩ |
| Inductor Peak Current Limit | 1.8A |
| Switching Frequency | 500kHz |
| Feedback Voltage Reference | 300mV |
| UVLO Rising | 2.3 typicalV |
| UVLO Falling | 1.85 typicalV |
| No Load Input Current | 250 typicalµA |
| Sleep Mode Quiescent Current | 200 typicalnA |
| LED Current at 5.0 V Input, 4 White LEDs | Up to 300mA |
| LED Current at 3.3 V Input, 4 White LEDs | Up to 200mA |
| LED Current at 4.2 V Input, 8 White LEDs | Up to 150mA |
| Operating Temperature Range | -40 to +125°C |
| Protection Features | Cycle-by-cycle current limit, UVLO, open-load, feedback short, soft-start, overtemperature |
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These are design resources that include the Microchip MCP1664
Qualification plan for transferring fabrication of selected MCP166x, MCP190x, MCP191x, and MCP192x device families to Microchip's Gresham Fab 4 (GRTM) facility.
