AT1865 Global Mixed-mode Technology Inc. 4+1 Channel DC-DC converter for DV Features General Description The AT1865 provide a complete power supply solution for digital video. They improve performance, component 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 efficiency. Channel 5 operate as LDO. 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% Efficient Boost-Buck and Buck-Boost. Highly Integrated 4+1 CH DC/DC with integrated Power MOSFETs. CH2 Selectable Buck or Boost for Li-ion Battery Application. 4 Channel Built-in Synchronous Rectified Current-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). Applications DV Ordering Information ORDER 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 FB3 CTL3 PVCC3 24 23 22 FB1 SEQ 25 CTL1 27 26 PVCC1 28 AT1865 CH1 Synchronous Rectified Current Mode Step-Up LX1 1 21 LX3 RTC_IN 2 20 RESET RTC_OUT 3 Thermal Pad 19 CT 18 VREF 17 AGND 12 13 14 CTL4 PVCC4 PVCC2 FB4 LX4 11 VCC 15 SEL2 16 7 9 6 LX2 10 CTL5 FB2 5 CTL2 PVCC5 8 VOUT5 4 CH2 Selectable Synchronous Rectified Current Mode StepUp/Step-Down CH3 Synchronous Rectified Current Mode StepDown CH4 Synchronous Rectified Current Mode StepDown AT1865 TQFN4X4-28 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. CH5 LDO TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.3 Mar 17, 2010 1