0.85V到5V的输入电压CXSU63034高效的固定频率同步DC/DC转换器自动PFM模式电磁干扰抑制反环控制电路

CXSU63034是一种高效的固定频率同步提升DC/DC转换器。装置输出电压可调。权力
运行期间的损耗仅为40μA，并降至小于停机时为1μA。0.85V到5V的输入电压范围使CXSU63034非常适合单电池锂离子电池，单或双AA电池电压升级应用程序。

目录

1.产品概述       2.产品特点     3.应用范围      4.技术规格书下载（产品PDF文档） 
5.产品封装图   6.电路原理图  7.功能概述      8.相关产品

 

一,产品概述(General Description)      

     The CXSU63034 is a highly efficient fix frequencysynchronous step-up
DC/DC converter. Output voltage of the device is adjustable. Power
dissipation during operation is only 40μA typical and drops to less than
1μA in shutdown. The 0.85V to 5V input voltage range makes the CXSU63034
ideally suitable for single cell Li-ion battery, single or dual AA battery voltage
step-up applications. Automatic PFM Mode operation increases efficiency at
light loads, further extend battery life. Switching frequency is internally set at 1.2MHz, design for use of small value surface mount inductor, input and
output capacitors. The internal synchronous switchesenhance efficiency.
Anti-ringing control circuitry reduces EMI by damping the inductance effect
in DCM mode. The CXSU63034 is available in SOT23-6 package.
二.产品特点(Features)

Input Voltage Operating Range: 0.85V to 5V
Voltage Output Range: 2.5V to 5.5V
Efficiency Up to 94%
3.3V/100mA Output at 1.0V Input
5V/700mA Output at 3.6V Input
Low Start-up Voltage: 0.85V Typical
1.2MHz Constant Frequency Operation
Internal Synchronous Rectifier
EMI Reduction Anti-Ring Control Circuitry
Low Shutdown Current: < 1.0uA
Over Current Protection
Over Temperature Protection
Light Load PFM Mode Operation
SOT23-6 Package
三,应用范围 (Applications)

 Li-ion Battery Charger

 TYPICAL APPLICATIONS
USB Audio
Wireless Mouse
Digital Still Cameras
MP3/MP4 Players
Portable Instruments
四.技术规格书下载（产品PDF）

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五,产品封装图 (Package)

PIN NUM	PIN NAME	DESCRIPTIONS
1	SW	Internal Switches Output
2	GND	Chip Ground
3	FB	Regulated Output Feedback
4	EN	Chip Enable, Active High
5	VOUT	Output Voltage
6	VIN	Input Voltage

六.电路原理图


七,功能概述

1)General Description
The CXSU63034 is a synchronous step-up DC-DC converter.
It utilizes internal MOSFET switches to achieve high
efficiency over full load current range. It operates at a
fixed switching frequency of 1.2MHz, and uses the
slope compensated peak current mode pulse width
modulation (PWM) architecture. The device can
operate with an input voltage below 1V and the
minimum start-up voltage is 0.85V.
2) Current Mode Operation 
The CXSU63034 is based on a slope compensated peak
current mode PWM control topology. It operates at a
fixed frequency of 1.2MHz. At the beginning of each
clock cycle, the main switch (NMOS) is turned on and
the inductor current starts to ramp. After the maximum
duty cycle or the sense current signal equals the error
amplifier output, the main switch is turned off and the
synchronous switch (PMOS) is turned on. This control
topology features cycle-by-cycle current limiting which
can prevent the main switch from overstress and the
external inductor from saturating.
3) Synchronous Rectification 
The CXSU63034 integrates a synchronous rectifier to
improve efficiency as well as to eliminate the need for
an external Schottky diode. The synchronous rectifier is
used to reduce the loss condition contributed by the
forward voltage of an external Schottky diode. The
synchronous rectifier is realized by a P-channel MOS
(PMOS) with gate control circuitry that incorporates
八,相关芯片选择指南           更多同类产品........    

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内置MOS同步DC-DC升压IC
型号	工作模式	电压范围	输出电压	输出电压形式	输出电压精度	输出电流限制	效率	静态电流	工作频率	封装
CXSU63033	PWM	0.9V-5.0V	最大5.5V	可调输出	+/-2%	950mA	90%	0.1uA	1.4MHz	SOT-26
CXSU63033A	PWM	0.85V-5.0V	最大5.0V	可调输出	+/-2%	2A	93%	0.1uA	1.5MHz	SOT23-6
CXSU63034	PWM	0.85V-5.5V	2.5V-5.5V	可调输出/真关断	+/-2%	1.2A	94%	300uA	1.2MHz	SOT23-6
CXSU63035	PWM	2.5V-4.5V	最大6V	可调输出	+/-2%	3.3A	93%	100uA	1MHz	ESOP-8
CXSU63036	PWM	2.4V-6.0V	2.5V-5.3V	可调输出/真关断	+/-2%	6A	91%	180uA	500KHz	ESOP-8
CXSU63037	PWM	2.5V-5.25V	2.5V-5.5V	可调输出	+/-2%	8A	90%	45uA	500KHz	ESOP-8
CXSU63038B	PWM	2.8V-5.0V	最大5.5V	可调输出	+/-2%	4A	91%	180uA	550KHz	ESOP-8
CXSU63038A	PWM	2.5V-6.0V	最大5.5V	可调输出/真关断	+/-2%	6A	90%	0.5uA	1.2MHz	SOP8-PP
CXSU63039	PWM	2.5V-5.5V	最大5.5V	可调输出/真关断	+/-2%	6A	90%	0.5uA	1.2MHz	QFN4X4-16L
CXSU63040	PWM	1.8V-6.0V	最大5.5V	可调输出/真关断	+/-2%	6A	90%	0.5uA	1.2MHz	SOP8-PP
CXSU63041B	PWM	1.8V-5.25V	2.5V-5.5V	可调输出	+/-2%	5A	97%	10uA	500KHz	QFN2X2-10