首页 > 产品中心 > 电源管理芯片 > DC-DC转换器 > 3A连续输出电流CXSD62145高/低边MOSFET PFM/PWM模式操作固定340kHz开关频率低ESR陶瓷输出电容稳定

3A连续输出电流CXSD62145高/低边MOSFET PFM/PWM模式操作固定340kHz开关频率低ESR陶瓷输出电容稳定

产品型号：	CXSD62145
产品类型：	DC-DC转换器
产品系列：	Buck降压型芯片
产品状态：	量产
浏览次数：	44 次

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产品简介

CXSD62145设计采用电流模式控制方案，可将4.5V至24V的宽输入电压转换为0.925V至20V的可调输出电压，提供出色的输出电压调节。

技术参数

输入电压范围 (VIN)	≤ 4.5~24V
输出电压 (VOUT)	ADJV
输出电流 (IOUT)	2A
工作频率	500Hz
转换效率	95%%
封装类型	TSOT-23-8A
Topology	CM BUCK降压型芯片
Control method	No. of PWM Outputs:1
Switching frequency	500
Protection	R-Top(milohm):500
Features	静态工作电流Iq (No load) (uA) :500
Application	R-Sync (milohm): 50
Operating temp	-40℃~125℃
Reference design	反馈电压Vref (V):0.807

产品详细介绍

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)
CXSD62144 CXSD62145 CXSD62146 CXSD62147 is a 3A synchronous buck converter with integrated 110mΩ power MOSFETs. The CXSD62144 design with a current-mode control scheme, can convert wide input voltage of 4.5V to 24V to the output voltage adjustable from 0.925V to 20V to provide excellent output voltage regulation.
The CXSD62144 CXSD62145 CXSD62146 CXSD62147 is equipped with an automatic PFM/PWM mode operation. At light load, the IC operates in the PFM mode to reduce the switching losses. At heavy load, the IC works in PWM.
The CXSD62144 CXSD62145 CXSD62146 CXSD62147 is also equipped with Power-on-reset, softstart, and whole protections (over-temperature, and current-limit) into a single package.
This device, available SOP-8P, provides a very compact system solution external components and PCB area.
二.产品特点(Features)
Wide Input Voltage from 4.5V to 24V
3A Continuous Output Current
Adjustable Output Voltage from 0.925V to 20V
Intergrated High/Low Side MOSFET
PFM/PWM mode Operation
Fixed 340kHz Switching Frequency
Stable with Low ESR Ceramic Output Capacitors
Power-On-Reset Detection
Programmable Soft-Start
Over-Temperature Protection
Current-Limit Protection with Frequency Foldback
Enable/Shutdown Function
Small SOP-8P Package
Lead Free and Green Devices Available
(RoHS Compliant
三,应用范围 (Applications)

LCD Monitor/TV

Set-Top Box
DSL, Switch HUB
Notebook Computer

四.下载产品资料PDF文档

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！

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五,产品封装图 (Package)

六.电路原理图

七,功能概述

Main Control Loop
The CXSD62144 is a constant frequency current mode switching regulator. During normal operation, the inter-
nal N-channel power MOSFET is turned on each cycle when the oscillator sets an internal RS latch and would
be turned off when an internal current comparator (ICMP) resets the latch. The peak inductor current at which ICMP
resets the RS latch is controlled by the voltage on the COMP pin, which is the output of the error amplifier
(EAMP). An external resistive divider connected between VOUT and ground allows the EAMP to receive an output
feedback voltage VFB at FB pin. When the load current increases, it causes a slight decrease in VFB relative to
the 0.925V reference, which in turn causes the COMP voltage to increase until the average inductor current
matches the new load current.
VIN Power-On-Reset (POR) and EN Under-voltage Lockout
The CXSD62144 keep monitoring the voltage on VIN pin to prevent wrong logic operations which may occur when
VIN voltage is not high enough for the internal control circuitry to operate. The VIN POR has a rising threshold
of 4.05V (typical) with 0.3V of hysteresis.
An external under-voltage lockout (UVLO) is sensed atthe EN pin. The EN UVLO has a rising threshold of 2.5V
with 0.2V of hysteresis. The EN pin should be connected a resistor divider from VIN to EN .After the VIN and EN
voltages exceed their respective voltage thresholds, the IC starts a start-up process and then ramps up the output
voltage to the setting of output voltage.
Over-Temperature Protection (OTP)
The over-temperature circuit limits the junction tempera-ture of the CXSD62144 When the junction temperature ex-
ceeds TJ =+160oC, a thermal sensor turns off the power MOSFET, allowing the device to cool down. The thermal
sensor allows the converter to start a start-up process and regulate the output voltage again after the junction
temperature cools by 50oC.
The OTP designed with a 50 oC hysteresis lowers the average T J during c ontinuous thermal overload conditions,
increasing life time of the IC.
Enable/Shutdown
Driving EN to ground places the CXSD62144 in shutdown.When in shutdown, the internal N-Channel power MOSFET turns off, all internal circuitry shuts down and the quies-cent supply current reduces to 0.3μA.
Current-Limit Protection
The CXSD62144 monitors the output current, flowing through the N-Channel power MOSFET, and limits the
IC from damages during overload, short-circuit and over-voltage conditions.
Frequency Foldback
The foldback frequency is controlled by the FB voltage.When the FB pin voltage is under 0.6V, the frequency of
the oscillator will be reduced to 110kHz. This lower fre-quency allows the inductor current to safely discharge,
thereby preventing current runaway. The oscillator’s fre-quency will switch to its designed rate when the feedback
voltage on FB rises above the rising frequency foldback threshold (0.6V, typical) again.
Over-Voltage Protection
The over-voltage function monitors the output voltage by FB pin. When the FB voltage increase over 120% of the
reference voltage, the over-voltage protection compara-tor will force the high-and low-side MOSFET gate driver
off. As soon as the output voltage is within regulation, the OVP comparator is disengaged. The chip will restore its
normal operation.
八,相关产品 更多同类产品.......

Switching Regulator > Buck Converter
Part_No	Package	Architectu	No.of PWM Outpu	Drive Lout (A)	Vin(V)		Fmax Khz	Vref (V)	R-Top (milohm)	R-Sync (milohm)	Iq (No load) (uA)
Part_No	Package	Architectu	No.of PWM Outpu	Drive Lout (A)	min	max	Fmax Khz	Vref (V)	R-Top (milohm)	R-Sync (milohm)	Iq (No load) (uA)
CXSD62122	TQFN5x6-28	CM	1	5	4.5	26	380	0.8	50	20	1000
CXSD62123	SOP-8	CM	1	2	4.5	26	380	0.8	100		1000
CXSD62124	SOP-8P	CM	1	4	4.5	26	380	0.8	80		1000
CXSD62125	SOT23-5\|TSOT23-5	CM	1	1	2.7	6	1500	0.6	280	250	25
CXSD62125A	SOT23-5	CM	1	1	2.7	6	1500	0.6	280	250
CXSD62126	SOP-8	CM	1	3	4.3	14	500	0.8	70	70	500
CXSD62127	SOP-8P	CM	1	3	4.3	14	500	0.8	55	45	500
CXSD62128B	TDFN3x3-10			3	2.6	5.5	2000	0.8	110	110	460
CXSD62129	TDFN3x3-10	CM	2	1	2.7	6	1500	0.6	280	250	500
CXSD62129A	TDFN3x3-10	CM	2	1	2.7	6	1500	0.6	280	250
CXSD62130	TDFN2x2-6	CM	1	1	2.7	6	1500	0.6	280	250	25
CXSD62130A	TDFN2x2-6	CM	1	1	2.7	6	1500	0.6	280	250
CXSD62131	TDFN3x3-12	CM	2	1	2.7	6	1500	0.6	280	250	25
CXSD62131A	TDFN3x3-12	CM	2	1	2.7	6	1500	0.6	280	250
CXSD62131C	TDFN 3x3 12	CM	2	1	3	5.5	1500	0.6	280	250	30
CXSD62132	TQFN3x3-20	CM	3	2	2.9	5.5	1500	0.6	-	-	300
CXSD62133	TDFN2x2-8	CM	1	1	3.3	8	1500	0.6	280	250	25
CXSD62134	SOP-8	CM	1	2	4.5	24	340	0.925	110	110	1900
CXSD62135	SOP-8P	CM	1	3	4.5	24	340	0.925	110	110	1900
CXSD62136	SOP-8	CM	1	2	4.5	24	340	0.92	130	130	1900
CXSD62136B	SOP-8P	CM	1	2	4.5	24	340	0.92	130	130	1900
CXSD62137	SOP-8P	CM	1	3	4.5	24	340	0.92	85	85	1900
CXSD62138	SOP-8P	CM	1	4	4.5	24	340	0.8	85	85	1900
CXSD62139	TSOT-23-8A	CM	1	3	4.5	24	500	0.807	100	40	1000
CXSD62140	TSOT-23-8A	CM	1	3	4.5	24	500	0.807	100	40	1000
CXSD62141	TSOT-23-8A	CM	1	2	4.5	24	500	0.807	115	50	1000
CXSD62142	SOP-8P	CM	1	3	4.5	24	1300	0.925	110	110	1900
CXSD62143	SOP-8	CM	1	2	4.5	24	340	0.925	110	110	1900
CXSD62144	SOP-8P	CM	1	3	4.5	24	340	0.925	110	110	1900
CXSD62145	TSOT-23-8A	CM	1	2	4.5	24	500	0.807	115	50	500
CXSD62146	TSOT-23-8A	CM	1	3	4.5	24	500	0.807	100	40	500
CXSD62147	TSOT-23-6	COT	1	2	4.6	16	500	0.6	110	100	50
CXSD62148	TSOT-23-6	COT	1	2	4.6	16	500	0.8	95	40	50
CXSD62149	TSOT-23-6	COT	1	3	4.6	16	500	0.8	90	35	50
CXSD62150	TSOT-23-8A	CM	1	2.5	4.5	24	500	0.807	140	60	1000
CXSD62151	TSOT-23-6,TDFN2x2-6	COT	1	3	4.6	16	500	0.6	110	80	50
CXSD62152	SOP8P\|TDFN3x3-10	CM	1	2	2.5	6	1000	0.8	85	75	460
CXSD62153	SOP8P\|TDFN3x3-10	CM	1	3.2	2.5	6	1000	0.8	85	75	460
CXSD62154	SOP8P\|TDFN3x3-10	CM	1	4	2.5	6	500	0.8	85	75	460
CXSD62155	SOP-8P	CM	1	5	2.5	6	1000	0.6	65	55	460
CXSD62156	TDFN 2x2 12	CM	1	3.5	2.7	5.5	1320	0.6	70	60	40
CXSD62157	SOP-8	CM	1	2	4.5	24	340	0.8	110	110	1900
CXSD62158	SOP-8P	CM	1	3	4.5	24	340	0.8	110	110	1900
CXSD62159	TDFN3x3-10	CM	1	2	4.5	24	340	0.8	110	110	1900
CXSD62160	TDFN3x3-10	CM	1	3	4.5	24	340	0.8	110	110	1900
CXSD62161	TSOT-23-8A	CM	1	2	4.5	24	500	0.791	115	50	1000
CXSD62162	TSOT-23-8A	CM	1	3	4.5	24	500	0.791	100	40	1000
CXSD62162S	TSOT-23-8A	CM	1	3	7	24	500	0.791	100	40	1000
CXSD62163	TDFN 2x2-6	CM	1	1	3	5.5	1500	0.6	260	230	30
CXSD62164	SOT23-5,TSOT23-5A	CM	1	1.2	3	5.5	1500	0.6	260	230	30
CXSD62164A	SOT23-5,TSOT23-5A	CM	1	1	3	5.5	1500	0.6	260	230	30
CXSD62164C	SOT23-5,TSOT23-5A	CM	1	1	3	5.5	1500	0.6	260	230	30
CXSD62165	SOT23-5,TSOT23-5A	CM	1	1.2	3	5.5	1500	0.6	260	230	30
CXSD62165C	SOT23-5,TSOT23-5A	CM	1	1	3	5.5	1500	0.6	260	230	30
CXSD62166	TSOT-23-8A	CM	1	2	4.5	24	800	0.807	115	50	1000
CXSD62167	TSOT-23-8A	CM	1	3	4.5	24	800	0.807	100	40	1000
CXSD62168	TSOT-23-8A	CM	1	2	4.5	24	500	0.807	115	50	1000
CXSD62169	TDFN5x5-16	CM	1	4	4.5	26	380	0.8	22	-	1000
CXSD62170	TDFN 2x2-8	CM	1	0.8	4.5	5.5	1700 ~ 2300	0.6			300
CXSD62171	TQFN 4x4 22	COT	1	8	2.7	28	100~1000	0.8	30	9	700
CXSD62172	TQFN4x4-23	COT	1	6	2.7	28	100~1000	0.8	30	9	750
CXSD62172A	TQFN 4x4 23	COT	1	8	2.7	28	100~1000	0.8	30	9	700
CXSD62172B	TQFN 4x4 23	COT	1	8	2.7	28	100~1000	0.8	30	9	700
CXSD62172C	TQFN 4x4 23	COT	1	10	2.7	28	100~1000	0.8	27	7	700
CXSD62172CA	TQFN 4x4 23	COT	1	10	2.7	28	100~1000	0.8	27	7	700
CXSD62172D	TQFN 4x4 23	COT	1	10	2.7	28	100~1000	0.8	27	7	700
CXSD62172DA	TQFN 4x4 23	COT	1	10	2.7	28	100~1000	0.8	27	7	700
CXSD62172E	TQFN 4x4 23	COT	1	8	2.7	28	100~1000	0.8	30	9	25
CXSD62173	TQFN 4x4 23	COT	1	6	2.7	28	100~1000	0.8	30	12	700
CXSD62173A	TQFN 4x4 23	COT	1	6	2.7	28	100~1000	0.8	30	12	700
CXSD62173C	TQFN 4x4 23	COT	1	6	2.7	28	100~1000	0.8	30	12	700
CXSD62173D	TQFN 4x4 23	COT	1	6	2.7	28	100~1000	0.8	30	12	700
CXSD62173E	TQFN 4x4 23	COT	1	8	2.7	28	100~1000	0.8	30	12	25
CXSD62174	TQFN5x5 30	COT	1	12	2.7	28	300~1000	0.8	9.7	5.2	700
CXSD62174A	TQFN5x5 30	COT	1	12	2.7	28	300~1000	0.8	14.6	7.8	750
CXSD62175	TQFN5x6-28	COT	1	8	3	25	500	0.75	12	12	400
CXSD62176	TDFN3x3-10	CM	1	3	2.6	6	1000	0.6	65	55	460
CXSD62176E	TDFN3x3-10	CM	1	3	2.6	5.5	1000	0.6	65	55	65
CXSD62177	TDFN3x3-10	CM	1	3	2.6	6	1000	0.6	75	55	460
CXSD62177A	TDFN3x3 10	CM	1	3	2.6	6	1000	0.8	75	55	460
CXSD62177B	TDFN3x3 10	CM	1	3	2.6	6	1000	0.8	75	55	460
CXSD62178	TQFN3x3-16	COT	1	8	6	28	500	0.6	24	14	80
CXSD62179	TSOT23-6	CM	1	1	2.7	5.5	1500	0.6	280	250	25
CXSD62180	SOT23-6, TDFN2x2 8	CM	1	3	2.6	6	1000	0.6	110	80	50
CXSD62181	TDFN3x3-10	CM	1	3	4.5	24	600	0.8	70	70	400
CXSD62182	TQNF4x4 32	COT	1	8	4.5	26	400~550	0.75	75	75	230
CXSD62183	TQN 4x4 26	COT	2	8	4.5	25	400~1400 (VDDQ) 1000(VPP)	0.6V for VPPSMBUS for VDDQ=1.0V~1.2V	20(VDDQ) 200(VPP)	7(VDDQ) 200(VPP)	270