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Technical content

Features

„ 1.8V ~ 5.5V BAT Input Voltage Operation. „ 3.0V ~ 5.5V VCC Input Voltage Operation. „ 95% Efficient DC/DC Converter. „ Combine Step-Up and Step-Down for 90% Effi- cient Boost-Buck and Buck-Boost. „ Highly Integrated 4+1 CH DC/DC with inte- grated Power MOSFETs. „ CH2 Selectable Buck or Boost for Li-ion Bat- tery Application. „ 4 Channel Built-in Synchronous Rectified Cur- rent-Mode PWM Converters. „ Low Power Consumption (Sleep Mode) <10uA. „ Built-In Short-circuit Protection (SCP) and Over Current Protection (OCP) for MOSFETs. „ Built-In Over Voltage Protection (OVP) and Over Load Protection (OLP). „ Built-In Soft-Start Function. „ Built-In Power ON/OFF Sequence Control. „ Built-In RTC LDO „ Built-In RESET function „ Fixed 1MHz Operating Frequency. „ TQFN28 Package (4mm x 4mm). General Description The AT1865 provide a complete power supply solution for digital video. They improve performance, compo- nent count, and size compared to other multi-channel controllers in 1-cell Li-Ion battery designs. On-chip MOSFETs provide up to 92~95% efficiency for critical power supplies. Channel 1/2/3/4 operate at one fixed frequency of 1MHz to optimize size, cost, and effi- ciency. Channel 5 operate as LDO.

Applications

„ DV

Ordering Information

NUMBER MARKING TEMP. RANGE PACKAGE (Green) AT1865RV1U A1865 0°C to +85°C TQFN4X4-28 Note: RV: TQFN4X4-28 1: Bonding Code U: Tape & Reel Pin Configuration AT1865 TQFN4X4-28 LX3 RESET CT VREF AGND VCC LX1 RTC_IN RTC_OUT VOUT5 PVCC5 CTL5 6 16 SEQ FB3 CTL1 FB1 CTL3 PVCC3 25SEL2 PVCC2 FB4 FB2 CTL2 PVCC4 CTL4 LX415 PVCC128 LX2 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. Thermal Pad AT1865 TQFN4X4-28 LX3 RESET CT VREF AGND VCC LX1 RTC_IN RTC_OUT VOUT5 PVCC5 CTL5 6 16 SEQ FB3 CTL1 FB1 CTL3 PVCC3 25SEL2 PVCC2 FB4 FB2 CTL2 PVCC4 CTL4 LX415 PVCC128 LX2 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. Thermal Pad CH1 Synchronous Rectified Current Mode Step-Up CH2 Selectable Synchronous Rectified Current Mode Step- Up/Step-Down CH3 Synchronous Rectified Current Mode Step- Down CH4 Synchronous Rectified Current Mode Step- Down CH5 LDO AT1865