CXSD62131两个独立的1.5MHz恒定频率电流模式和PWM降压转换器组成2.7V至5.5V输入电压

CXSD62131由两个独立的1.5MHz恒定频率、电流模式和PWM降压转换器组成。每个转换器集成一个主开关由两个独立的1.5MHz恒定频率、电流模式和PWM降压转换器组成。每个转换器集成一个主开关和一个同步整流器，没有外部肖特基二极管高效率

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 CXSD62131 CXSD62131A CXSD62131C consists of two independent 1.5MHz constant frequency, current mode, and PWM step-down converters. Each converter integrates a main switch with a synchronous rectifier for high efficiency without an external Schottky diode. The CXSD62131  is ideal for powering portable equipment that runs from a single cell Lithium Ion (Li+) battery. Each converter can supply 1A of load current from a 2.7V to 5.5V input voltage. The output voltage can be regulated as low as 0.6V. The CXSD62131 can also run at 100% duty cycle for low dropout applications.
二.产品特点(Features)

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1A Output Current on Each Channel
2.7V to 5.5V Input Voltage Range
1.5MHz Constant Frequency Operation
Low Dropout Operation at 100% Duty Cycle
Synchronous Topology
0.6V Low Reference Voltage
Current Mode Operation
Over-Temperature Protection
Over-Current Protection
Up to 94% Efficiency
Internally Compensated
Lead Free and Green Devices Available
(RoHS Compliant)
三,应用范围 (Applications)

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TV Tuner/Box
Portable Instrument
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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Main Control Loop
The CXSD62131 has dual independent constant frequency,current-mode PWM step-down converters. During nor-
mal operation, the internal P-channel power MOSFET is turned on each cycle when the oscillator sets an internal
RS latch and is turned off when an internal comparator (ICMP) resets the latch. The peak inductor current at which
ICMP resets the RS latch is controlled by the voltage on the COMP, 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 slightly decrease in VFB associated
with the 0.6V reference, which in turn causes the COMP voltage to increase until the average inductor current
matches the new load current.
Soft-Start
Each channel in the CXSD62131 has a built-in soft-start to control the output voltage rise during start-up. During soft-start, an internal ramp, connected to the one of the posi- tive inputs of the error amplifier, raise up to replace the reference voltage (0.6V typical) until the ramp voltage reaches the reference voltage.
Short Circuit Protection
For each channel, when the output is shortened to the ground, the frequency of the oscillator will be reduced to
210kHz. This lower frequency allows the inductor current to safely discharge, thereby preventing current runaway.
The oscillator’s frequency will gradually increase to its designed rate when the feedback voltage on the FB again
approaches 0.6V.
Over-Temperature Protection (OTP) 
For each channel, the over-temperature circuit limits the junction temperature of the CXSD62131. When the junction
temperature exceeds 150oC, a thermal sensor turns off the power MOSFETs, allowing the channels to cool down.
The thermal sensor allows the converter to start a soft-start process and to regulate the output voltage again
after the junction temperature cools by 40ïC. The OTP is designed with a 40ïC hysteresis to lower the average
Junction Temperature (TJ) during continuous thermal overload conditions, increasing the lifetime of the device.
 Enable/Shutdown
For each channel, driving EN to the ground places the channel in shutdown mode. When in shutdown, the inter-
nal power MOSFETs are turned off, all internal circuitry shuts down, and the quiescent supply current reduces to
1μA maximally.
Automoatic PFM/PWM mode Switch
The CXSD62131 is a fixed frequency PWM peak current modulation control step-down converter. At light loads,
the CXSD62131 will automatically enter in pulse frequency modulation operation to reduce the dominant switching
losses. In PFM operation, the inductor current may reach zero or reverse on each pulse. A zero current comparator
turns off the N-channel synchronous MOSFET, forcing DCM (Discontinuous Current Mode) operation at light
load. These controls get very low quiescent, help to main-tain high efficiency over the complete load range.
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