70mΩ功率MOSFETs的3A同步整流Buck变换器CXSD62126电流模式控制方案4.3V宽输入电压转换为14V

CXSD62126是一个集成了70mΩ功率mosfet。CXSD62126采用电流模式控制方案，可将4.3V到14V的宽输入电压转换为输出电压可从0.8V调节至车辆识别号，提供出色的输出电压调节。
为了在所有负载电流范围内实现高效率，CXSD62126配备了具有自动跳过/PWM模式操作。

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 CXSD62126 is a 3A synchronous-rectified Buck converter with integrated
70m Ω power MOSFETs. The CXSD62126, designed with a current-mode control
scheme,can convert wide input voltage of 4.3V to 14V to the output voltage
adjustable from 0.8V to VIN to provide excellent output voltage regulation.
For high efficiency over all load current range, the CXSD62126 is equipped
with an automatic Skip/PWM mode operation. At light load, the IC operates
in the Skip mode, which keeps a constant minimum inductor peak current,
to reduce switching losses. At heavy load, the IC works in PWM mode, which
inductor peak current is programmed by the COMP voltage, to provide high
efficiency and excel lent output voltage regulation.The CXSD62126 is also
equipped with power-on-reset,soft-start, soft-stop, and whole protections
(under-voltage,over-voltage, over-temperature, and current-limit) into a
single package. In shutdown mode, the supply current drops below 3μA.
This device, available in a 8-pin SOP-8 package, provides a very compact
system solution with minimal external components and PCB area.
二.产品特点(Features)

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Wide Input Voltage from 4.3V to 14V
Output Current up to 3A
Adjustable Output Voltage from 0.8V to V IN
- ±2% System Accuracy
70mΩ Integrated Power MOSFETs
High Efficiency up to 95%
- Automatic Skip/PWM Mode Operation
Current-Mode Operation
- Easy Feedback Compensation
- Stable with Low ESR Output Capacitors
- Fast Load/Line Transient Response
Power-On-Reset Monitoring
Fixed 500kHz Switching Frequency in PWM Mode
Built-In Digital Soft-Start and Soft-Stop
Current-Limit Protection with Frequency Foldback
123% Over-Voltage Protection
Hiccup-Mode 50% Under-Voltage Protection
Over-Temperature Protection
<3μA Quiescent Current in Shutdown Mode
Small SOP-8 Package
Lead Free and Green Devices Available
(RoHS Compliant)
三,应用范围 (Applications)

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OLPC, UMPC
Notebook Computer
Handheld Portable Device
Step-Down Converters Requiring High Efficiency
and 3A Output Current
四.下载产品资料PDF文档 

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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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六.电路原理图

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七,功能概述

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Thermal Consideration

In most applications, the JTMA7104A does not dissipate much heat due to its high efficiency. But, in applications
where the JTMA7104A is running at high ambient tem perature with low supply voltage and high duty cycles, the
heat dissipated may exceed the maximum junction temperature of the part. If the junction temperature reaches
approximately 150°C, both power switches will be turned off and the SW node will become high impedance.
To avoid the JTMA7104A from exceeding the maximum junction temperature, the user will need to do some ther-
mal analysis. The goal of the thermal analysis is to deter mine whether the power dissipated exceeds the maxi-
mum junction temperature of the part. The power dissipated by the part is approximated:
PD ≅ IOUT2 x (RP-FET x D+RN-FET x (1-D))
The temperature rise is given by:
TR = (PD)(èJA)
Where PD is the power dissipated by the regulator, D is
duty cycle of main switch
D = VOUT/VIN
The èJA is the thermal resistance from the junction of the
die to the ambient temperature. The junction temperature,
TJ, is given by:
TJ = TA + TR
Where TA is the ambient temperature.
Layout Consideration
For all switching power supplies, the layout is an impor tant step in the design; especially at high peak currents
and switching frequencies. If the layout is not carefully done, the regulator might show noise problems and duty
cycle jitter.
1. The input capacitor should be placed close to the VIN and GND. Connecting the capacitor and VIN/GND with
short and wide trace without any via holes for good input voltage filtering. The distance between VIN/GND
to capacitor less than 2mm respectively is recommended.
2. To minimize copper trace connections that can inject noise into the system, the inductor should be placed
as close as possible to the SW pin to minimize the noise coupling into other circuits.
3. The output capacitor should be place closed to converter VOUT and GND.
4. Since the feedback pin and network is a high imped ance circuit the feedback network should be routed
away from the inductor. The feedback pin and feedback network should be shielded with a ground plane
or trace to minimize noise coupling into this circuit.
5. A star ground connection or ground plane minimizes ground shifts and noise is recommended.
八,相关产品                  更多同类产品.......

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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)
					min	max
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