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SC632 Datasheet(PDF) 10 Page - Semtech Corporation |
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SC632 Datasheet(HTML) 10 Page - Semtech Corporation |
10 / 14 page SC632 10 General Description The SC632 is a 5.0V output charge pump regulator designed to support up to 400mA (T A ≤ 55°C, 3.15V ≤ V IN ≤ 4.2V) and 275mA (T A ≤ 85°C, 3.15V ≤ V IN ≤ 5.5V) of continu- ous current for powering 5.0V devices in portable handheld equipment including Compact Flash and CF+ products. The SC632 has three operating modes — 1x, 1.5x, and 2x. The 1x mode is a linear series regulation mode with a low open-loop output resistance of only 250m Ω. The 1x mode functions as a low-noise series linear regulator. The 1.5x and 2x modes are a low noise, constant frequency, con- stant duty cycle switch mode, using two bucket capacitors. One bucket supports the full output current while the other bucket charges from the input. The two buckets exchange roles in the next phase, supplying continuous output current in both phases and reducing the need for a large output decoupling capacitor. The constant fre- quency, constant duty cycle operation also produces predictable constant frequency harmonics. Mode Transition Hysteresis Hysteresis is provided to prevent chatter between charge pump modes for input steps of up to 120mV. Decouple the input to prevent steps greater than 120mV, for optimum transient performance, when the input voltage reaches the mode transition thresholds. Thermal Resistance The SC632 package is thermally efficient when the circuit board layout connects the thermal pad through multiple vias to the ground plane. The thermal resistance rating is dependent upon the connection between the thermal pad and the ground plane. A layout that is done correctly should keep the junction temperature below the over- temperature limit while operating the SC632 within the specified electrical conditions. A poor layout may allow the junction temperature to reach the over temperature limit, so it is important to maintain adequate ground plane around the device to maximize heat transfer to the PCB. Temperature Derating The V IN supply range and ambient temperature range of the application should be compared with the following derating curve to determine the maximum safe continu- ous load current. The DC operating points beneath each curve are in the safe operating temperature range of the MLP package. 150 200 250 300 350 400 450 35 45 55 65 75 85 95 105 Ambient Temp (°C) Derating for VIN < 4.2V Derating for VIN < 5.5V Maximum Continuous Output Protection Circuitry The SC632 also provides protection circuitry that pre- vents the device from operating in an unspecified state. These functions include: Over-Current Protection (OCP) Short-Circuit Current Protection (SCCP) Over-Temperature Protection (OTP) Over-Current Protection Over-current protection is provided to limit the output current. When V OUT is greater than 2V, OCP limits the output to 1A typical. The threshold at 2V allows the device to recover from excessive voltage droop during an over current. • • • Applications Information |
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