CXSD61055A step-down DC/DC converter wide 4.5V to 21V input voltage range 2A continuous load current capability

CXSD61055A fault protection includes cycle-by-cycle current limit,
UVLO, output overvoltage protection and thermal shutdown. The adjustable
soft-start function prevents inrush current at turn-on. This device uses current
mode control scheme which provides fast transient response

目录

1.产品概述                       2.产品特点
3.应用范围                       4.下载产品资料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)      

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      The CXSD61055A is a synchronous step-down DC/DC converter that 

provides wide 4.5V to 21V input voltage range and 2A continuous load current capability.
     The CXSD61055A fault protection includes cycle-by-cycle current limit, 

UVLO, output overvoltage protection and thermal shutdown. The adjustable 

soft-start function prevents inrush current at turn-on. This device uses current

 mode control scheme which provides  fast  transient  response. Internal compensation   function   reduces   external compensation 

components and simplifies the design process. In shutdown mode, the supply

 current is less than 1μA.

     The CXSD61055A is available in SOT-23-6 package and provides good thermal conductance.
二.产品特点(Features)

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 High Efficiency up to 94%
 Low RDS(ON) Integrated Power MOSFET
 Internal Compensation Function
 Wide Input Voltage Range: 4.5V to 21V
 Adjustable Output Voltage from 0.8V to 17.85V
 2A Output Current
 Fixed 600KHz Switching Frequency
 Current Mode Operation
 Cycle-by-Cycle Current Limit
 Over-Temperature Protection with Auto Recovery
 Output Overvoltage Protection
 Under Voltage Lockout
 <1μA Shutdown Current
 SOT-23-6 Package
三,应用范围 (Applications)

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STB (Set-Top-Box)
LCD Display, TV
Distributed Power System
Networking, XDSL Modem
四.技术规格书下载（产品PDF）

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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)

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I/O	Pin Name	Pin No.	Pin Function
I	FB	3	Voltage Feedback Input Pin. Connect FB and VOUT with a resistive voltage divider. This IC senses feedback voltage via FB and regulates it at 0.8V.
I	VIN	5	Power Supply Input Pin. Drive VIN pin by 4.5V to 21V voltage to power on the chip.
I		4	Enable Input Pin. This pin is a digital control input which turns the converter on or off. Connect to VIN with a 100kΩ resistor for self-startup.
I	GND	2	Ground Pin.
O	LX	6	Power Switching Output. LX is the output of the internal high side NMOS switch.
O	BST	1	High Side Gate Drive Boost Pin. A capacitor rating between 10nF~100nF must be connected from this pin to LX. It can boost the gate drive to fully turn on the internal high side NMOS.

六.电路原理图

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VOUT	C1	R1	R2	C9	C4	L1	C2
1.2V	10μF MLCC x2	4.99kΩ	10kΩ	--	200pF~1nF	2.2μH	22μF MLCC x2
1.8V	10μF MLCC x2	4.99kΩ	3.92kΩ	--	200pF~1nF	2.2μH	22μF MLCC x2
2.5V	10μF MLCC x2	4.99kΩ	2.32kΩ	--	200pF~1nF	4.7μH	22μF MLCC x2
3.3V	10μF MLCC x2	30.9kΩ	9.76kΩ	--	200pF~1nF	4.7μH	22μF MLCC x2
5V	10μF MLCC x2	30.9kΩ	5.76kΩ	--	200pF~1nF	4.7μH	22μF MLCC x2
1.2V	100μF EC x1	4.99kΩ	10kΩ	0.1μF	--	2.2μH	100μF EC x1
1.8V	100μF EC x1	4.99kΩ	3.92kΩ	0.1μF	--	2.2μH	100μF EC x1
2.5V	100μF EC x1	4.99kΩ	2.32kΩ	0.1μF	--	4.7μH	100μF EC x1
3.3V	100μF EC x1	30.9kΩ	9.76kΩ	0.1μF	--	4.7μH	100μF EC x1
5V	100μF EC x1	30.9kΩ	5.76kΩ	0.1μF	--	4.7μH	100μF EC x1

七,功能概述

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Absolute Maximum Ratings (Note 1)

● Supply Voltage VIN ----------------------------------------------------------------------------- -0.3V to +23V

● Enable Voltage SH------------------------------------------------------------------------ -0.3V to +23V

● LX Voltage VLX (50ns) ---------------------------------------------------------------------- -1V to VIN+0.3V
● BST Pin Voltage VBST ----------------------------------------------------------------------- VLX-0.3V to VLX+6V
● All Other Pins Voltage -------------------------------------------------------------------------- -0.3V to +6V
● Maximum Junction Temperature (TJ) ---------------------------------------------------- +150°C
● Storage Temperature (TS) -------------------------------------------------------------------- -65°C to +150°C
● Lead Temperature (Soldering, 10sec.) --------------------------------------------------- +260°C
● Package Thermal Resistance, (θJA) SOT-23-6 ------------------------------------------------ +250°C/W
● Package Thermal Resistance, (θJC) SOT-23-6 ---------------------------------------------------- +110°C/W
八,相关芯片选择指南                 更多同类产品......

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高压同步DC-DC降压IC
型号	输入耐压	输出电压	输出电流	反馈电压	工作频率	效率	静态工 作电流	待机电流	封装
CXSD61049	8V-35V	可调输出 带线损补偿	2A/带可调恒流设置	1.21V	130K	95%	1.3mA	112uA	SOP-8
CXSD61050	8V-35V	可调输出/带线损 补偿带使能端	2A/带可调恒流设置	1.21V	130K	93%	1.3mA		SOP-8
CXSD61046	4.5-20V	可调输出	2.0A	0.923V	340K	95%	1mA	6uA	SOP-8
CXSD61046A/B	4.5-27V	可调输出	2.0A/2.5A	0.925V	340K	96%	1.3mA	0.3uA	SOP-8
CXSD61048	8V--35V	可调输出 带线损补偿	2.0A/带可调限流保护	1.2V	100-500K	93%	750uA	110uA	ESOP-8
CXSD61048A	10V--35V	可调输出 带线损补偿	2.5A/带可调限流保护	1.2V	100-500K可调	93%	15mA	110uA	SOP-8
CXSD61048B	8V-35V	可调输出 带线损补偿	2.8A/带可调限流保护	1.21V	100-500K可调	93%	15mA	110uA	SOP-8
CXSD61048C	8V-35V	可调输出 带线损补偿	3.2A/带可调限流保护	1.21V	100-500K可调	93%	15mA	110uA	SOP-8
CXSD61047	4.6-22V	可调输出	3.0A	0.923V	340K	95%	55uA	1uA	ESOP8
CXSD61047A	4.5-27V	可调输出	3.0A	0.925V	340K	93%	1.3mA	0.3uA	ESOP8
CXSD61047B	4.5V-23V	可调输出	3.5A	0.925V	340K	96%	2.5mA		ESOP-8
CXSD61051	8V-35V	可调输出 带线损补偿	扩流4.5A带 可调限流保护	1.21V	100-500K可调	95%	14mA	100uA	ESOP8
CXSD61052	3.6-40V	可调输出	2.0A	0.8V	440K	94%	74uA	0.07uA	ESOP-8
CXSD61053	4.5-20V	可调输出	4.0A	0.923V	340K	95%	1.6mA	6uA	ESOP8
CXSD61054	3.5-23V	可调输出	2.0A	0.6V	600K	96%	400uA	1uA	SOT-26
CXSD61055	4.5-17V	可调输出	2.0A	0.6V	600K	96%	400uA	1uA	SOT-26
CXSD61055A	4.5V-23V	可调输出	2.0A	0.8V	600K	92%	800uA		SOT-26
CXSD61055B	3.3-17V	可调输出	2.0A	0.6V	600K	96%	400uA	4uA	SOT-26
CXSD61056	4.5-26V	可调输出	1.2A	0.8V	1.4M	94%	600uA	1uA	SOT-26
CXSD61057	4.0-42V	可调输出	1.5A	0.8V	650K	91%	600uA	6uA	SOT-26