RICHTEK RT5024GQW

RT5024 is a complete power solution for digital cameras and other handheld devices. It consists of a multi-channel DC-DC power converter unit, a single-cell linear lithium-ion battery charger, a charger type detector, and an I²C control interface. The power converter unit includes a synchronous boost converter (CH1), a synchronous buck-boost converter (CH2), three synchronous buck converters (CH3/4/5), two LDOs with input voltage as low as 1.5V (CH6/8), a WLED driver operating in synchronous high-voltage boost mode or low-voltage current regulation mode (CH7), and a keep-alive LDO for RTC applications (CH9). All converters feature internal frequency compensation with integrated power MOSFETs. The power converter unit provides comprehensive protection including overcurrent, thermal shutdown, overvoltage, and undervoltage protection. The RT5024 incorporates a wake-up pulse generation circuit to monitor VIN or battery insertion events, with six preset power-on sequencing options. The battery charger includes Automatic Power Path Management (APPM) without external MOSFETs, and supports sleep mode upon power removal. The charging task optimizes the charge rate through a control algorithm, covering pre-charge mode, fast charge mode, and constant voltage mode. Charge current is programmable via the I²C control interface, and battery regulation voltage and current can be adjusted through JEITA temperature-based control or alternative schemes configured via the I²C interface. An internal thermal feedback circuit regulates die temperature to optimize charge rate across all ambient temperatures; the charging task always terminates in constant voltage mode when the charge current drops to 10% of the fast charge current. The charger includes undervoltage and overvoltage protection for the power input voltage VIN, as well as circuitry to detect USB Standard Downstream Port (SDP), USB Charging Downstream Port (CDP), Dedicated Charging Port (DCP), or Apple/Sony charger ports via the D+ and D− pins of the USB interface. The RT5024 uses status indicators to display charger status, including an open-drain CHG pin (charger status) and an interrupt (INT) for immediate notification of status changes. The RT5024 is available in a 5×5 WQFN-40L package.

• Power Converter Unit:
  • CH1 Low-Voltage Synchronous Boost: Supports up to 1A load, Dynamic Voltage Scaling (DVS), load disconnect, up to 95% efficiency, PSM/PWM selectable
  • CH2 Low-Voltage Synchronous Buck-Boost: Supports up to 1A load, DVS, up to 95% efficiency, PSM/PWM selectable
  • CH3/4 Low-Voltage Synchronous Buck: Supports up to 1.3A load, DVS, up to 95% efficiency, 100% (max) duty cycle, PSM/PWM selectable
  • CH5 Low-Voltage Synchronous Buck: Supports up to 0.6A load, up to 95% efficiency, 100% (max) duty cycle; output voltage selectable from preset list or set via external feedback network
  • CH6 Low-Input-Power LDO: VIN range 1.5V to 5.5V, output voltage level selectable via I²C register
  • CH7 WLED Driver, operates in synchronous boost or current regulation mode: Boost mode features LED open-circuit protection (OVP 16V or 25V, selectable via I²C register), supports 2 to 6 WLEDs in series with load disconnect; current regulation mode supports 1 WLED with 31-level WLED dimming; mode auto-selected via external circuit topology
  • CH8 General-Purpose LDO: VIN range 1.5V to 5.5V, output voltage level selectable via I²C register
  • CH9 Low Quiescent Current LDO for RTC power supply, with reverse leakage protection, fixed output 3.25V
  • Six preset power switch sequences configurable via single pin SEQ
  • Internal compensation integrated for all power switches
  • Output discharge per channel on shutdown
  • Wake-up pulse monitors battery and VIN insertion
  • CH1/3/4/5 fixed 2MHz switching frequency; CH2/7 fixed 1MHz switching frequency
• Charger Unit:
  • VIN maximum rated voltage 28V
  • Selectable power input current limit (0.1A / 0.5A / 1A / 1.5A)
  • Automatic Power Path Management (APPM) with integrated power MOSFETs
  • Battery charge current control and regulation voltage control
  • Programmable charge current and safety charge timer
  • Charge rate optimization via thermal feedback
  • Under-voltage protection, over-voltage protection
  • Charger status indicator
  • Interrupt indication for JEITA temperature/fault/status events when PMU is enabled
  • Charger type detection: supports Apple and Sony chargers; secondary charger detection to distinguish CDP and DCP
  • I²C control interface: supports Fast Mode up to 400kb/s
  • Compact 40-pin 5x5 WQFN package
  • RoHS compliant and halogen-free

• Digital camera power systems
• CMOS sensor digital video cameras
• Portable instruments