Synchronous fixed-frequency step-up DC/DC converter provides output disconnect and internal synchronous rectification in a low-profile 6-lead DFN package. The converter starts from a 680 mV input and operates down to 500 mV after start-up, with an adjustable 1.5 V to 5.25 V output range. The LTC3526LB-2 variant uses low-noise PWM operation at a fixed 2 MHz switching frequency and supports up to 94% efficiency. The device includes integrated soft-start, current-mode control with internal compensation, logic-controlled shutdown, anti-ring control, and an internal synchronous rectifier. Operation is specified over a -40 °C to 85 °C temperature range.
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| Converter Type | Synchronous step-up DC/DC converter |
| Output Current Capability at 3.3 V from Single Cell | 100mA |
| Output Current Capability at 3.3 V from Two Cells | 200mA |
| Minimum Start-Up Input Voltage | 0.68 typical, 0.8 maximumV |
| Input Voltage Range After Start-Up | 0.5 to 5V |
| Output Voltage Adjust Range | 1.5 to 5.25V |
| Feedback Pin Voltage | 1.165 to 1.225, 1.195 typicalV |
| Maximum Efficiency | 94% |
| Switching Frequency | 1.8 to 2.4, 2 typicalMHz |
| N-Channel MOSFET Current Limit | 550 minimum, 750 typicalmA |
| Maximum Duty Cycle | 87 minimum, 90 typical% |
| Active Quiescent Current | 250 typical, 500 maximumµA |
| Shutdown Quiescent Current | 0.01 typical, 1 maximumµA |
| N-Channel MOSFET On Resistance | 0.4 typicalΩ |
| P-Channel MOSFET On Resistance | 0.6 typicalΩ |
| SHDN Input High Voltage | 0.8 minimumV |
| SHDN Input Low Voltage | 0.3 maximumV |
| Operating Temperature Range | -40 to 85°C |
| Package | 6-lead 2 mm × 2 mm × 0.75 mm DFN |
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