低压电源升压输出电压转换器CXSU6338B单碱性镍氢电池1MHz的开关频率效率高达95%输出电流300毫安同步整流器

CXSU6338B是一个升压转换器，提供来自低压电源的升压输出电压。
由于它的专利设计，它在一个很低的输入电压下启动到850mV，使它
单电池碱性/镍氢电池操作的理想选择。1MHz的开关频率允许使用微小的、
低剖面的电感和陶瓷电容器。电流模式的PWM设计是内部补偿的，减少了
外部零件计数。

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 CXSU6338B is a step-up converter that provides a boosted output voltage from a low voltage source.

Because of its proprietary design, it starts up at a very low input voltage down to 850mV, making it

an ideal choice for single cell alkaline/NiMH battery operations.

   A switching frequency of 1MHz minimizes solution footprint by allowing the use of tiny, low profile

inductors and ceramic capacitors. The current mode PWM design is internally compensated, reducing

external parts count.

     CXSU6338B is housed in a tiny SOT23-5 and SOT89-3 Package.

二.产品特点(Features)

Up to 95% Efficiency

Output voltage accuracy 3％

1MHz Switching Frequency allows small inductor

and output cap

Input boost-strapping allows using small or no

input cap

Low Vin Start-up Voltage down to 850mV Ideal

for Single Alkaline Cell operations

Maximum Output Current up to 300mA

Low Noise PWM control

Internally Compensated Current Mode Control

Internal Synchronous Rectifier

Logic Control Shutdown (IQ<1uA)

三,应用范围 (Applications)

One to Three Cell Battery Operated Devices

Medical Instruments

Bluetooth Headsets

Flash-Based MP3 Players

Noise Canceling Headphones

四.技术规格书下载（产品PDF）

需要详细的PDF规格书请扫一扫微信联系我们，还可以获得免费样品以及技术支持！

 

五,产品封装图 (Package)

六.电路原理图

七,功能概述

Parameters	Condition	Min.	Typ.	Max.	Unit
Minimum Input   Voltage			0.7		V
Startup Voltage			0.85	1.1	V
Dropout Voltage,   Vout≥2.8V	FB=OUT		3.3		V
	FB=G		5		V
FB Feedback   Voltage	Vout=2.5 to 5V		0.6		V
FB Input Current				50	nA
Output Voltage   Range	External divider	2.5		5	V
Quiescent Current   at OUT	Vfb=0.7V		25		uA
Shutdown Supply   Current at OUT	EN=G		0.1	1	uA
NMOS Switch On   Resistance	Isw=100mA		0.3		ohm
PMOS Switch On   Resistance	Isw=100mA		0.7		ohm
NMOS Switch   Current Limit		1			A
SW Leakage   Current	Vout=5.5V, Vsw=0   or 5.5V, EN=G			1	uA
EN Input Current				1	uA
EN Input Voltage   for “Low”				0.3	V
EN Input Voltage   for “High”		0.6			V

八,相关芯片选择指南

升压型DC/DC转换器(DC/DC Step-up Converter )
Part No.	MODE	VIN	VOUT	IQ	FOSC	Eff.	Accu.	Power switching	IOUT	Package
CXSU6337	PFM	0.8~5.5V	2.5~6V 100mV Step	4μA	450KHz	85%	±2%	Internal MOSFET	300mA	SOT89-3 SOT23-3 SOT23-5
CXSU6337C	PFM	0.8~5.5V	2.5~6V 100mV Step	6μA	400KHz	90%	±2%	External MOSFET	-	SOT89-5 SOT23-3 SOT23-5
CXSU6338B	Sync Boost PFM/PWM	0.85~5V	3.3, 5V, ADJ	25μA	1MHz	95%	±2%	Internal Sync Rectifier	300mA	SOT23-5
CXSU6339	Sync Boost PWM	0.9~5V	1.8~3.6V	8μA	1MHz	94%	±2%	Internal Sync   Rectifier	300mA	SOT89-3 SOT23-3 SOT23-5
CXSU6340	Sync Boost PWM	0.9~5V	1.8~3.6V	8μA	1MHz	94%	±2%	Internal Sync Rectifier	300mA	SOT89-3 SOT23-3 SOT23-5