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LP8728C-Q1 Datasheet(PDF) 10 Page - Texas Instruments |
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LP8728C-Q1 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 25 page Control Logic EN_B1 Thermal Shutdown Oscillator Reference Voltage OTP UVLO DEFSEL PG_B1 VIN_B1 10 µF FB_B1 1.5 µH SW_B1 VIN VOUT2 VOUT1 PG_B2 PG_B3 PG_B4 EN_B2 EN_B3 EN_B4 VIN VIN VIN VOUT3 VOUT4 VIN LDO 10 µF Buck1 (Active Pulldown) Buck2 (Active Pulldown) VIN_B2 10 µF FB_B2 1.5 µH SW_B2 10 µF Buck3 (Active Pulldown) VIN_B3 10 µF FB_B3 1.5 µH SW_B3 10 µF Buck4 (Active Pulldown) VIN_B4 10 µF FB_B4 1.5 µH SW_B4 10 µF AVDD BYP 1 µF 1 µF LP8728C-Q1 SNVSA71 – FEBRUARY 2015 www.ti.com 7 Detailed Description 7.1 Overview The LP8728C-Q1 has four integrated high-efficiency buck converters. Each buck converter has individual enable input and power good output pins. When the first enable pin is pulled high there is a 420-µs start-up delay when the device wakes up from the shutdown mode and all internal reference blocks are started up. Once reference blocks have settled, the corresponding buck converter turns on. Buck cores utilize the soft-start feature to limit the inrush current during start-up. Once a buck output reaches 96% (typical) of the desired output voltage, the power-good pin is pulled high (see Figure 9). When at least one buck core is active, the remaining buck converters will start up without any start-up delay. If the output voltage drops below 93% (typical) of desired voltage due to, for example, an overload condition, the corresponding power-good pin is pulled low. The power-good signal is always held low for at least 50 ms. When the enable pin is pulled low, the corresponding buck converter's power good signals are set low, and the buck converter is instantly shut down. An output capacitor is then discharged through an internal 70- Ω (typical) pulldown resistor. The pulldown resistor is connected between buck feedback pin and ground and is only active when the enable pin is set low. When all enable signals are pulled low, the LP8728C-Q1 enters a low current shutdown mode. 7.2 Functional Block Diagram 10 Submit Documentation Feedback Copyright © 2015, Texas Instruments Incorporated Product Folder Links: LP8728C-Q1 |
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