產(chǎn)品詳情

微源半導體 LPQ65131 雙輸出電源芯片

General Description

The LPQ65131 device is a dual-output DC-DC converter supply that generates a positive output up to 15 V and a negative output down to –15 V. The converter maintains low output voltage ripple. Typically, the maximum output currents are in the 200- mA to 500-mA range, depending on input voltage to output voltage ratio and the current limit option. The combined (VPOS and VNEG) efficiency reaches 85% to keep systems cool or achieve a longer battery-on time. The input voltage range of 2.7 V to 5.5 V allows the devices to be powered from batteries or from fixed 3.3-V or 5-V rails.
The converter operates with a fixed frequency PWMcontrol topology and, when operating in power save mode, uses a pulse-skipping mode at light load currents. It operates with only 500-μA device quiescent current. Independent enable pins allow flexible power-up and power-down sequencing for both outputs. The positive and negative outputs operate independently, allowing for non-symmetrical output voltages and currents.
The converter has an internal current limit, over voltage protection, and a thermal shutdown for highest reliability under fault conditions. The converter is available in a 4-mm × 4-mm QFN-24 package. The solution size is small with a minimum switching frequency of 1.25 MHz for smaller inductors and few other external components required.

Features

◆ Input voltage range: 2.7-V to 5.5-V

◆ AEC-Q100 Grade 2 Qualified

◆ VPOS positive boost converter output

◆ Adjustable output: up to 15 V

◆ Switch current limit 2 A

◆ Conversion efficiency: up to 89%

◆ VNEG negative inverting buck-boost converter output

◆ Adjustable output: down to –15 V

◆ Switch current limit 2 A

◆ Conversion efficiency: up to 81%

◆ Control output for external P-channel FET

◆ Supports complete disconnection from battery

◆ 1-µA shutdown current

◆ Individual enable inputs for flexible output sequencing

◆ Protection features

◆ Over voltage protection at VPOS and VNEG

◆ Input under voltage lockout

◆ VPOS and VNEG SCP

◆ Thermal shutdown protection

◆ 4-mm × 4-mm QFN-24 package

Applications

◆ LCD and AMOLED displays (approx. 4" to 17")

◆ Personal electronics (notebook, monitor,gaming)

◆ Building automation (elevator, thermostat)

◆ Healthcare, fitness, EPOS, industrial HMI, test & measurement