CXPC3348电源管理单元PMU 2个同步块和2个CMOS低功耗Buck输出电流为1.5A每个LDO的输出电流为0.5A同步buck高效单片同步降压调节器恒定频率电流模式架构

产品概述

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     The CXPC3348 is a power management unit (PMU), with 2 synchronous Bucks and 2 CMOS low-dropout regulators that delivers a maximum current of 1.5A for Buck’s output and a maximum current of 0.5A for each individual LDO’s output.
The synchronous buck is a high-efficiency monolithic synchronous buck regulator using a constant frequency, current mode architecture. The device is available in an adjustable version. Supply current with no load is 40uA and drops to <1uA in shutdown. The 2.5V to 6V input voltage range makes the CXPC3348 ideally suited for single Li-Ion battery powered applications. 100% duty cycle provides low dropout operation, extending battery life in portable systems. PWM/PFM mode operation provides very low output ripple voltage for noise sensitive applications. Switching frequency is internally set at 1.5MHz, allowing the use of small surface mount inductors and capacitors. Low output voltages are easily supported with the 0.6V feedback reference voltage.
Each of the 2 LDOs is low-dropout regulator that delivers a maximum current of 0.5A individual output. Typical dropout voltage at 0.5A load current is 0.8V. They have excellent load and line transient response and good temperature characteristics, which can assure the stability of chip and power system. The output accuracy of each channel is set within 2% by trimming.
Typical LDO output voltage: VO1=1.2V, VO2=1.8V.
Other fixed voltage can be provided in the range of 1.0V~4.5V every 0.1V step. It also can be customized on command. LDOs can also work under a wide input voltage ranging from 1.8V to 6V. They can provide foldback short-circuit protection and output current limit function.
CXPC3348 is available in lead (Pb)-free QFN3x3-16

   产品特点 返回TOP

 High Efficiency : Up to 96%

• Capable of Delivering 1.5A
• 1.5MHz Switching Frequency
• No External Schottky Diode Needed
• Low dropout 100% Duty operation
• PFM Mode for High Efficiency in Light Load
• Over temperature Protected
• Low Quiescent Current: 40μA
• Short Circuit Protection
• Inrush Current Limit and Soft Start
• LDO
• Max output current for each channel is 0.5A
• Input voltage range: 1.8 – 6V
• Output voltage range: 1.0V~4.5V (customized on command every 0.1V step)
• Low power consumption: 50uA (Typ.)
• Low output noise (47uVRMS)
• Standby Mode: 0.1uA
• Low dropout voltage:
• 600mV@IO1=250mA, VO1=1.2V
• 800mV@IO2=500mA, VO2=1.8V
• High ripple rejection:65dB@1KHz (Typ.)
• Low temperature coefficient: ±100ppm/C
• Excellent line regulation: 0.05%/V
• Highly accurate: ±2%
• Output current limit
• Fold-back short circuit current

   应用范围 返回TOP

    Distributed Power Systems
 Digital Set Top Boxes
 Flat Panel Television and Monitors
 Wireless and DSL Modems
 Power source for cellular phones and various kind of PCSs
 Battery Powered equipment

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