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TPS65182 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS65182 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 24 page TPS65182, TPS65182B www.ti.com SLVSAA2C – MARCH 2010 – REVISED OCTOBER 2010 It is possible for the host to force the TPS65182/TPS65182B directly into SLEEP mode from ACTIVE mode by de-asserting the WAKEUP pin in which case the device follows the pre-defined power-down sequence before entering SLEEP mode. DEPENDENCIES BETWEEN RAILS Charge pumps, LDOs, and VCOM driver are dependent on the positive and inverting buck-boost converters and several dependencies exist that affect the power-up sequencing. These dependencies are listed below. 1. Inverting buck-boost (DCDC2) must be in regulation before positive boost (DCDC1) can be enabled. Internally, DCDC1 enable is gated by DCDC2 power good. 2. Positive boost (DCDC1) must be in regulation before LDO2 (VNEG) can be enabled. Internally LDO2 enable is gated DCDC1 power-good. 3. Positive boost (DCDC1) must be in regulation before VCOM can be enabled; Internally VCOM enable is gated by DCDC1 power good. 4. Positive boost (DCDC1) must be in regulation before negative charge pump (CP2) can be enabled. Internally CP2 enable is gated by DCDC1 power good. 5. Positive boost (DCDC1) must be in regulation before positive charge pump (CP1) can be enabled. Internally CP1 enable is gated by DCDC1 power good. 6. LDO2 must be in regulation before LDO1 can be enabled. Internally LDO1 enable is gated by LDO2 power good. 7. The minimum delay time between any two PWRx pins must be > 62.5 µs in order to follow the power up sequence defined by GPIO control. If any two PWRx pins are pulled up together (< 62.5 µs apart) rails will be staggered in a manner that a subsequent rail’s enable is gated by PG of a preceding rail. In this case, the default order of power-up is LDO2 (VNEG), CP2 (VEE), LDO1 (VPOS), and CP1(VDDH). If any two PWRx pins are pulled low then all rails will go down at the same time. Copyright © 2010, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Link(s): TPS65182 TPS65182B |
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