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SC560 Datasheet(PDF) 10 Page - Semtech Corporation |
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SC560 Datasheet(HTML) 10 Page - Semtech Corporation |
10 / 15 page SC560 10 General Description The SC560 is a family of dual output linear regulator devices intended for applications where low dropout voltage, low supply current, and low output noise are critical. Each device provides a very simple, low cost solution for two separate regulated outputs. Very little PCB area is required due to the miniature package size and the need for only four external capacitors. The linear regulators LDOA and LDOB are powered from a single input supply rail, and each provides 300mA of output current. The SC560 can provide output voltages in the range 1.2V to 5.0V. The output voltages for the SC560A, SC560B and SC560C are set by connecting external resistor dividers to the feedback pins of each LDO. All other versions of the SC560 have fixed output voltage values shown in the Pinout and Voltage Options table. Power On Control The SC560A and SC560C devices have a single enable pin (EN) that controls both LDO outputs. Pulling this pin low causes the device to enter a low power shutdown mode where it typically draws 100nA from the input supply. When EN transitions high, the output of LDOA is enabled. After a delay of 128μs, the output of LDOB is enabled. In the SC560C, when the output voltage of LDOA reaches 87% of its regulation point, the delay timer starts and the PGOOD signal transitions high after a delay of 200ms. The power up/down sequence is shown in the timing diagram in Figure 1. OUTA PGOOD EN OUTB 87% 87% 200ms 128 μs Figure 1 — Timing Diagram The SC560B and the fixed output variants provide a separate enable pin for LDOB which allows LDOA and LDOB to be enabled independently. The EN pin controls the LDOA output and the ENB provides the same functionality relative to the LDOB output. The table shown below lists the effect of the polarity of the EN and ENB signals on the outputs of LDOA and LDOB. Since LDOB can be enabled separately, there is no timing relationship between the two outputs at startup. EN ENB LDOA LDOB Low Low Off Off Low High Off Off High Low On Off High High On On The SC560C and the fixed output variants have a PGOOD signal which monitors the output of LDOA and transitions high 200ms after LDOA has reached 87% of its regulation point. This can be used to hold a processor in reset when the output voltage is out of regulation. Output Voltage Selection The output voltage of each LDO for the SC560A, SC560B, and SC560C version is set independently using external resistor dividers. Figure 2 illustrates the proper connection for LDOA. OUTA FBA R1 R2 Figure 2 — Output Voltage Feedback Circuit Applications Information |
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Similar Description - SC560 |
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