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High Power Step-Down Synchronous DC/DC Controller CXSD6278 is a 300kHz constant frequency voltagemode synchronous switching controller that drives exter-nal N-channel MOSFETs.

The CXSD6278 is a 300kHz constant frequency voltagemode synchronous switching controller that drives exter-nal N-channel MOSFETs. When the input supply dropsclose to output, the upper MOSFET remains on, achiev-ing 100% duty cycle. Internal loop compensation is opti-mized for fast transient response, eliminating externalcompensation network. The precision 0.8V referencemakes this part suitable for a wide variety of low voltageapplications. Soft-start is internally set to 2ms, limitingthe input in-rush current and preventing the output fromovershoot during powering up.The CXSD6278 has over current and short circuitprotections. Over current protection is achieved by moni-toring the voltage drop across the high side MOSFET,eliminating the need for a current sensing resistor andshort circuit condition is detected through the FB pin. Ifeither fault conditions occur, the CXSD6278 would initiatethe soft-start cycle. After three cycles and if the fault condi-tion persists, the controller will be shut down. To restartthe controller, either recycle the VCC supply or momen-tarily pull the OSCSET pin below 1.25V.The CXSD6278 can be shutdown by pulling the OCSETpin below 1.25V. In shutdown, both gate drive signals willbe low. The controller is available in a small SOP-8package.

产品特点 返回TOP

• Operates from +5V Input

• 0.8V Internal Reference Voltage

- ±1.5% Accuracy Over Line, Load and Temperature

• 0.8V to VCC Output Range

• Full Duty Cycle Range

- 0% to 100%

• Internal Loop Compensation

• Internal Soft-Start

- Typical 2ms

• Programmable Over-Current Protection

- Lossless Sensing Using MOSFET RDS (ON)

• Under-Voltage Protection

• Drives External N-Channel MOSFETs

• Shutdown Control

• Small SOP-8 Package

• Lead Free and Green Devices Avaliable

(RoHS Compliant)

应用范围 返回TOP

• Motherboard

• Graphics Cards

• Cable or DSL Modems, Set Top Boxes

• DSP Supplies

• Memory Supplies

• 5V Input DC-DC Regulators

• Distributed Power Supplies

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Switching Regulator > Buck Controller
Part_No	Package	Topology	Archi tectu	Phase	No.of PWM Output	Output Current (A)	Input Voltage (V)		Reference Voltage (V)	Bias Voltage (V)	Quiescent Current (uA)
Part_No	Package	Topology	Archi tectu	Phase	No.of PWM Output	Output Current (A)	min	max	Reference Voltage (V)	Bias Voltage (V)	Quiescent Current (uA)
CXSD6273	SOP-14\|QSOP-16 QFN4x4-16	Buck	VM	1	1	30	2.9	13.2	0.9	12	8000
CXSD6274	SOP-8	Buck	VM	1	1	20	2.9	13.2	0.8	12	5000
CXSD6274C	SOP-8	Buck	VM	1	1	20	2.9	13.2	0.8	12	5000
CXSD6275	QFN4x4-24	Multiphase	VM	2	1	60	3.1	13.2	0.6	12	5000
CXSD6276	SOP-8	Buck	VM	1	1	20	2.2	13.2	0.8	5~12	2100
CXSD6276A	SOP-8	Buck	VM	1	1	20	2.2	13.2	0.8	5~12	2100
CXSD6277/A/B	SOP8\|TSSOP8	Buck	VM	1	1	5	5	13.2	1.25\|0.8	5~12	3000
CXSD6278	SOP-8	Buck	VM	1	1	10	3.3	5.5	0.8	5	2100
CXSD6279B	SOP-14	Buck	VM	1	1	10	5	13.2	0.8	12	2000
CXSD6280	TSSOP-24 \|QFN5x5-32	Buck	VM	1	2	20	5	13.2	0.6	5~12	4000
CXSD6281N	SOP14\|QSOP16 \|QFN-16	Buck	VM	1	1	30	2.9	13.2	0.9	12	4000
CXSD6282	SOP-14	Buck	VM	1	1	30	2.2	13.2	0.6	12	5000
CXSD6282A	SOP-14	Buck	VM	1	1	30	2.2	13.2	0.6	12	5000
CXSD6283	SOP-14	Buck	VM	1	1	25	2.2	13.2	0.8	12	5000
CXSD6284/A	LQFP7x7 48 \|TQFN7x7-48	Buck\|Boost \|Flyback	VM	1	6	0.015	1.4	6.5	-	5	1800
CXSD6285	TSSOP-24P	Buck	VM	1	2	20	2.97	5.5	0.8	5~12	5000
CXSD6286	SOP-14	Buck	VM	1	1	10	5	13.2	0.8	12	3000
CXSD6287	SOP-8-P\|DIP-8	Buck	VM	1	1	30	2.9	13.2	1.2	12	3000
CXSD6288	SSOP28 QFN4x4-24	Buck	VM	1	2	20	5	24	0.9	5	1200
CXSD6289	SOP-20	Buck	VM	1	2	20	2.2	13.2	0.6	5~12	4000
CXSD6290	SOP8\|DFN3x3-10		VM	1	2	-	-	-	-	5~12	550
CXSD6291HC	DIP8\|SOP-8	Buck\|Boost \|Flyback \|Forward	VM	1	1	1	1.2	9	24	5	9 ~ 24
CXSD6292	SSOP16\|QFN4x4-16 \|TQFN3x3-16	Buck	VM	1	1	25	3	25	0.6	5	1700
CXSD6293	TDFN3x3-10	Buck	COT	1	1	25	3	25	0.5	5	350
CXSD6294	QFN4x4-24	Buck	CM	2	1	40	4.5	13.2	0.6	5~12	4000
CXSD6295	SOP8P\|TDFN3x3-10	Buck	VM	1	1	20	3	13.2	0.8	5~12	2500
CXSD6296A\|B\|C\|D	SOP8P	Buck	VM	1	1	25	3	13.2	0.6\|0.8	5~12	1200
CXSD6297	TDFN3x3-10	Buck	VM	1	1	25	4	13.2	0.8	5~12	2000
CXSD6298	TDFN3x3-10	Buck	COT	1	1	25	4.5	25	0.6	5~12	80
CXSD6299\|A	SOP-8P	Buck	VM	1	1	25	4.5	13.2	0.8	5~12	16000
CXSD62100	TQFN3x3-10	Buck	VM	1	1	25	4.5	13.2	0.6	5~12	2500
CXSD62101\|L	TDFN3x3-10	Buck	COT	1	1	30	3	25	0.8	5~12	2000
CXSD62102	TQFN3x3-16	Buck	COT	1	1	30	1.8	28	0.6	5	600
CXSD62102A	TQFN 3x3 16	Buck	COT	1	1	30	1.8	28	0.6	5	600
CXSD62103	QFN4x4-24	Buck	VM	2	1	50	4.5	13.2	0.6	5~12	5000
CXSD62104	TQFN4x4-24	Buck	COT	1	2	15	6	25	2	N	550
CXSD62105	TQFN4x4-24	Buck	COT	1	2	15	6	25	2	N	550
CXSD62106\|A	TQFN4x4-4 TQFN3x3-20	Buck	COT	1	2	20	3	28	0.75	5	800
CXSD62107	TQFN3x3-16	Buck	COT	1	1	20	1.8	28	0.75	5	400
CXSD62108	QFN3.5x3.5-14 \|TQFN3x3-16	Buck	COT	1	1	20	1.8	28	0.75	5	400
CXSD62109	TQFN3x3-16	Buck	COT	1	2	20	1.8	28	0.75	5	400
CXSD62110	QFN3x3-20 TQFN3x3-16	Buck	COT	1	2	20	3	28	1.8\|1.5\|0.5	5	740
CXSD62111	TQFN4x4-24 \|QFN3x3-20	Buck	CM	1	2	15	5	28	0.5	N	3000
CXSD62112	TDFN3x3-10	Buck	COT	1	1	20	1.8	28	0.5	5	250
CXSD62113\|C	TQFN3x3-20	Buck	COT	1	2	15	6	25	2	N	550
CXSD62113E	TQFN 3x3 20	Buck	COT	2	2	11	6	25	2	N	550
CXSD62114	TQFN3x3-20	Buck	COT	2	2	11	5.5	25	2	N	280
CXSD62115	QFN4x4-24	Multiphase	VM	2	1	60	3.1	13.2	0.85	12	5000
CXSD62116A\|B\|C	SOP-8P	Buck	VM	1	1	20	2.9	13.2	0.8	12	16000
CXSD62117	SOP-20	Buck	VM	2	2	30	10	13.2	1	12	5000
CXSD62118	TDFN3x3-10	Buck	COT	1	1	25	1.8	28	0.7	5	250
CXSD62119	TQFN3x3-20	Buck	COT	2	1	40	1.8	25	REFIN Setting	5	700
CXSD62120	QFN 3x3 20 TQFN 3x3 16	Buck	COT	1	2	20	3	28	1.8\|1.5 1.35\|1.2 0.5	5	800
CXSD62121A	TQFN3x3 20	Buck	COT	1	2	15	3	28	0.75	5	220
CXSD62121B	TQFN3x3 20	Buck	COT	1	2	15	3	28	0.75	5	220
CXSD62121	TQFN3x3-20	Buck	COT	1	2	20	3	28	0.75	5	180

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上一条：Synchronous Buck PWM Controller CXSD6274 CXSD6274C uses fixed 300kHz switching frequency, voltage mode, and synchronous PWM controller which drives dual N-channel MOSFETs 下一条：Synchronous Buck PWM and Linear Controller CXSD6281N integrates synchronous buck PWM and linear controller, as well as monitoring and protection functions into a single package.

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High Power Step-Down Synchronous DC/DC Controller CXSD6278 is a 300kHz constant frequency voltagemode synchronous switching controller that drives exter-nal N-channel MOSFETs.

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