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LP8733 Datasheet(PDF) 27 Page - Texas Instruments |
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LP8733 Datasheet(HTML) 27 Page - Texas Instruments |
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27 / 85 page  EN EN_BUCK0 EN 1ms 3ms EN_BUCK1 1ms 4ms EN_BUCK0 EN_BUCK1 3ms 1ms 1ms 4ms Typical sequence Sequence with short EN low and high periods Startup cntr Shutdown cntr 0 0 1 0 0 1 0 1 2 3 4 5 6 0 0 1 2 0 1 2 3 4 5 27 LP8733-Q1 www.ti.com SNVSB64 – SEPTEMBER 2018 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated In the same way the LDO regulator is selected for delayed control with: • LDOx_EN = 1 in LDOx_CTRL register • LDOx_EN_PIN_CTRL = 1 in LDOx_CTRL register • LDOx_VSET[4:0] bits in LDOx_VOUT register defines the voltage when EN pin is high • The delay from rising edge of EN pin to the regulator enable is set by LDOx_STARTUP_DELAY[3:0] bits in LDOx_DELAY register and • The delay from falling edge of EN pin to the regulator disable is set by LDOx_SHUTDOWN_DELAY[3:0] bits in LDOx_DELAY register. The GPO (and GPO2) digital output signals can be also controlled as a part of start-up and shutdown sequencing with the following settings: • GPOx_EN = 1 in GPO_CTRL register • GPOx_EN_PIN_CTRL = 1 in GPO_CTRL register • The delay from rising edge of EN pin to the rising edge of GPO/GPO2 signal is set by GPOx_STARTUP_DELAY[3:0] bits in GPOx_DELAY register and • The delay from falling edge of EN pin to the falling edge of GPO/GPO2 signal is set by GPOx_SHUTDOWN_DELAY[3:0] bits in GPOx_DELAY register. An example of the start-up and shutdown sequences for the buck regulators are shown in Figure 16. The start-up and shutdown delays for the Buck0 regulator are 1 ms and 4 ms; for the Buck1 regulator start-up and shutdown delays are 3 ms and 1 ms. The delay settings are used only for enable/disable control with EN signal. Figure 16. Start-Up and Shutdown Sequencing |
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