CXPC3346同步buck是高效的单片同步buck稳压器采用恒定频率电流模式结构轻载高效PFM模式励磁涌流限制及软起动每个通道输出电流为0.5A输入电压2-6V 输出电压1.2V~4.5V

产品概述

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The CXPC3346 is a power management unit (PMU), with 1 synchronous Buck 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 CXPC3346 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=2.8V, VO2=1.8V.
Other fixed voltage can be provided in the range of 1.2V~4.5V every 0.1V step. It also can be customized on command. LDOs can also work under a wide input voltage ranging from 2V to 6V. They can provide foldback short-circuit protection and output current limit function.
CXPC3346 is available in lead (Pb)-free ESOP-8(with exposed pad for heat dissipation) package.

   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: 2 – 6V
Output voltage range: 1.2V~4.5V (customized on command every 0.1V step)
Low power consumption: 40uA (Typ.)
Low output noise (47uVRMS)
Low dropout voltage:
600mV@IO1=500mA, VO1=2.8V
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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