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RT5021 数据表(PDF) 1 Page - Richtek Technology Corporation |
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RT5021 数据表(HTML) 1 Page - Richtek Technology Corporation |
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1 / 67 page  RT5021 ® DS5021-01 April 2013 www.richtek.com 1 Copyright 2013 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation. © 6 + 3 Channels DC/DC PMU with Li-ion Battery Charger for CMOS DSC/DV General Description The RT5021 is a complete power supply solution for digital still cameras and other hand held devices. The RT5021 is composed of a multi-channel DC/DC power converter unit, a single-cell linear Li-ion battery charger, a charger type detector, and an I 2C control interface. The power converter unit includes one synchronous step- up converter (CH1), one synchronous step-up/down converter (CH2), three synchronous step-down converters (CH3/4/5), two LDOs with input power as low as 1.5V (CH6/8), one WLED driver in synchronous high-voltage step-up mode or low-voltage current regulator mode (CH7), and a keep-alive LDO (CH9) for RTC application. All converters are internally frequency compensated and integrate power MOSFETs. The power converter unit provides complete protection functions : over current, thermal shutdown, over voltage, and under voltage protection. RT5021 has a WAKEUP impulse generation circuitry to monitor VIN or BAT installation event. To fulfill most of applications, RT5021 has six preset power on/off sequences. The battery charger includes Auto Power Path Management (APPM). No external MOSFETs are required. The charger can enter sleep mode when power is removed. Simplified Application Circuit Charging tasks are optimized by using a control algorithm to vary the charge rate, including pre-charge mode, fast charge mode and constant voltage mode. The charge current can also be programmed via the I2C control interface. The battery regulation voltage and current can be adjusted by JEITA standard temperature control or other schemes set via the I2C interface. The internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures. The charging task will always be terminated in constant voltage mode when the charging current reduces to the termination current of 10% x ICHG_FAST. The charger includes under voltage and over voltage protection for the supply input voltage, VIN. The charger includes USB charger detection circuitry via D+ and D- pins of USB interface to detect USB standard downstream ports (SDP), USB charging downstream port (CDP), dedicated charger port (DCP), or Apple/Sony charger ports. RT5021 uses some indicators to show charger states : two open drain ports CHG and CHG2, and an interrupt (INT) to immediately notify the state change. RT5021 has I2C interface to control rich functions of Power Converter Unit and Charger Unit. The RT5021 is available in the WQFN-40L 5x5 package. VIN SYS GND PVD1 Adapter/USB RT5021 SCL SDA I 2 C Control VO2 LX3 LX4 LX5 VO6 PVD7 VO8 VRTC Step-Up for Motor Step-Up/Down for I/O Step-Down for Core Step-Down for Memory Step-Down LDO Step-Up for LED Backlight LDO LDO for RTC System Power BAT Charger for Battery |
类似零件编号 - RT5021 |
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类似说明 - RT5021 |
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