首页 > 产品中心 > 电源管理芯片 > DC-DC转换器 > CXSD6276是固定的300kHz频率电压模式和同步PWM控制器两个低成本N通道mosfet设计为单电源5~12V或双电源工作电压为负载瞬变提供良好的调节

CXSD6276是固定的300kHz频率电压模式和同步PWM控制器两个低成本N通道mosfet设计为单电源5~12V或双电源工作电压为负载瞬变提供良好的调节

产品型号：	CXSD6276
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：	45 次

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产品简介

CXSD6276 CXSD6276A集成了控制、监视和保护功能
成为一个单一的8针封装，以提供一个低成本和完美的电源解决方案。
上电复位（POR）电路监测VCC电源电压以防止
逻辑控制错误。内部0.8V参考电压提供低输出电压
低至0.8V，以便进一步应用。内置数字软启动
软启动间隔防止输出电压超调和限制
输入电流。控制器的过电流保护监视输出
通过使用低压侧MOSFET的RDS（ON）上的电压降得到的电流，
不需要电流感应电阻器

技术参数

输入电压范围 (VIN)	≤ 2.2~13.2V
输出电压 (VOUT)	ADJV
输出电流 (IOUT)	20A
工作频率	1500 Hz
转换效率	95%%
封装类型	SOP-8
Topology	Buck VM降压型芯片
Control method	No. of PWM Outputs:1
Switching frequency	1500
Protection	Phase: 1
Features	静态工作电流 Quiescent Current (typ)(uA):2100
Application	Bias Voltage (typ) (V):5~12
Operating temp	-40℃~125℃
Reference design	反馈电压Reference Voltage(V):0.8

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)

The CXSD6276 CXSD6276A is a fixed 300kHz frequency, voltage mode, and
synchronous PWM controller. The device drives two low cost N-channel
MOSFETs and is de-signed to work with single 5~12V or two supply
voltage(s), providing excellent regulation for load transients.
The CXSD6276 CXSD6276A integrates controls, monitoring, and protection functions
into a single 8-pin package to provide a low cost and perfect power solution.
A power-on-reset (POR) circuit monitors the VCC supply voltage to prevent
wrong logic controls. An internal 0.8V reference provides low output voltage
down to 0.8V for further applications. An built-in digital soft-start with fixed
soft-start interval prevents the output voltage from overshoot as well as limits
the input current. The controller’s over-current protection monitors the output
current by using the voltage drop across the low-side MOSFET’s RDS(ON),
eliminating the need of a current sensing resistor. Additional under voltage and
over voltage protections monitor the voltage on FB pin for short-circuit and
over-voltage protections. The over-current protection cycles the soft-start
function until 4 over-current events are counted.Pulling and holding the voltage
on OCSET pin below 0.15V with an open drain device shuts down the controller.
二.产品特点(Features)

1.)Operating with Single 5~12V Supply Voltage
2.)or Two Supply Voltages
3.)Drive Dual Low Cost N-Channel MOSFETs
Adaptive Shoot-Through Protection
4.)Built-in Feedback Compensation
Voltage-Mode PWM Control
0~100% Duty Ratio
Fast Transient Response
5.)±2% 0.8V Reference
Over Line, Load Regulation, and Operating
6.)Temperature Programmable Over-Current Protection
Using RDS(ON) of Low-Side MOSFET
7.)Hiccup-Mode Under-Voltage Protection
8.)118% Over-Voltage Protection
9.)Adjustable Output Voltage
10.)Small Converter Size
300kHz Constant Switching Frequency
Small SOP-8 Package
11.)Built-In Digital Soft-Start
12.)Shutdown Control Using an External MOSFET
13.)Lead Free and Green Devices Available
三,应用范围 (Applications)

Motherboard
Graphics Card
High Current, up to 20A, DC-DC Converters
四.下载产品资料PDF文档

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五,产品封装图 (Package)

BOOT (Pin 1)

This pin provides ground referenced bias voltage to the high-side MOSFET driver. A bootstrap circuit with a diode connected to 5~12V is used to create a voltage suitable to drive a logic-level N-channel MOSFET.
UGATE (Pin 2)
Connect this pin to the high-side N-channel MOSFET’s gate. This pin provides gate drive for the high-side MOSFET.
GND (Pin 3)
The GND terminal provides return path for the IC’s biascurrent and the low-side MOSFET driver’s pull-low current. Connect the pin to the system ground via very low impedance layout on PCBs.
LGATE (Pin 4)
Connect this pin to the low-side N-channel MOSFET’s gate. This pin provides gate drive for the low-side MOSFET.
VCC (Pin 5)
Connect this pin to a 5~12V supply voltage. This pin provides bias supply for the control circuitry and the low-side MOSFET driver. The voltage at this pin is monitored for the Power-On-Reset (POR) purpose.
FB (Pin 6)
This pin is the inverting input of the internal Gm amplifier.Connect this pin to the output (VOUT) of the converter via an external resistor divider for closed-loop operation.The output voltage set by the resistor divider is deter-mined using the following formula :
where R1 is the resistor connected from VOUT to FB ,and R2 is the resistor connected from FB to GND. The FB pin is also monitored for under and over-voltage events.
OCSET (Pin 7)
The OCSET is a dual-function input pin for over-current protection and shutdown control. Connect a resistor (ROCSET) from this pin to the Drain of the low-side MOSFET. This resistor, an internal 40μA current source (IOCSET), and the MOSFET’s on-resistance(RDSON) set the converter over-current trip level (IPEAK) according to the following formula:
Pulling and holding this pin below 0.15V with an open drain device, with very low parasitic capacitor, shuts down the IC with floating output and also resets the over-current counter. Releasing OCSET pin initiates a new soft-start and the converter works again.
PHASE (Pin 8)
The pin provides return path for the high-side MOSFETdriver’s pull-low current. Connect this pin to the high-side MOSFET’s source
六.电路原理图

七,功能概述
Power-On-Reset (POR)
The CXSD6276 monitors the VCC voltage (V CC) for Power-On-Reset function, preventing wrong logic operation during powering on. When the VCC voltage is ready, the CXSD6276 starts a start-up process and then ramps the output voltage up to the target voltage.
Soft-Start
The CXSD6276 has a built-in digital soft-start to control the output voltage rise and limit the current surge at the start-up. During the soft-start, an internal ramp con-nected to the one of the positive inputs of the Gm amplifier rises up from 0V to 2V to replace the reference voltage (0.8V) until the ramp voltage reaches the refer-
ence voltage. The soft-start interval is about 3.2mstypical, independent of the converter’s input and out-put voltages.
Over-Current Protection (OCP)
The over-current function protects the switching c o nverter against over-current or short-circuit conditions. The controller senses the inductor current by detecting the drain-to-source voltage, product of the inductor’s current and the on-resistance, of the low-side MOSFET during it’s on-state. This method enhances the converter’s efficiency and reduces cost by eliminating a current sensing resistor.A resistor (ROCSET), connected from the OCSET to the
Over-Current Protection (OCP) (Cont.)
low-side MOSFET’s drain, programs the over-current trip level. An internal 40μA (typical) current source flowing through the ROCSET develops a voltage (VROCSET) across the ROCSET. When the VOCSET

八,相关产品 更多同类产品......

Switching Regulator > Buck Controller
Part_No	Package	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	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	VM	1	1	30	2.9	13.2	0.9	12	8000
CXSD6274	SOP-8	VM	1	1	20	2.9	13.2	0.8	12	5000
CXSD6274C	SOP-8	VM	1	1	20	2.9	13.2	0.8	12	5000
CXSD6275	QFN4x4-24	VM	2	1	60	3.1	13.2	0.6	12	5000
CXSD6276	SOP-8	VM	1	1	20	2.2	13.2	0.8	5~12	2100
CXSD6276A	SOP-8	VM	1	1	20	2.2	13.2	0.8	5~12	2100
CXSD6277/A/B	SOP8\|TSSOP8	VM	1	1	5	5	13.2	1.25\|0.8	5~12	3000
CXSD6278	SOP-8	VM	1	1	10	3.3	5.5	0.8	5	2100
CXSD6279B	SOP-14	VM	1	1	10	5	13.2	0.8	12	2000
CXSD6280	TSSOP-24 \|QFN5x5-32	VM	1	2	20	5	13.2	0.6	5~12	4000
CXSD6281N	SOP14 QSOP16 QFN-16	VM	1	1	30	2.9	13.2	0.9	12	4000
CXSD6282	SOP-14	VM	1	1	30	2.2	13.2	0.6	12	5000
CXSD6282A	SOP-14	VM	1	1	30	2.2	13.2	0.6	12	5000
CXSD6283	SOP-14	VM	1	1	25	2.2	13.2	0.8	12	5000
CXSD6284/A	LQFP7x7 48 TQFN7x7-48	VM	1	6	0.015	1.4	6.5	-	5	1800
CXSD6285	TSSOP-24P	VM	1	2	20	2.97	5.5	0.8	5~12	5000
CXSD6286	SOP-14	VM	1	1	10	5	13.2	0.8	12	3000
CXSD6287	SOP-8-P\|DIP-8	VM	1	1	30	2.9	13.2	1.2	12	3000
CXSD6288	SSOP28 QFN4x4-24	VM	1	2	20	5	24	0.9	5	1200
CXSD6289	SOP-20	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	VM	1	1	1	1.2	9	24	5	9 ~ 24
CXSD6292	SSOP16 QFN4x4-16 TQFN3x3-16	VM	1	1	25	3	25	0.6	5	1700
CXSD6293	TDFN3x3-10	COT	1	1	25	3	25	0.5	5	350
CXSD6294	QFN4x4-24	CM	2	1	40	4.5	13.2	0.6	5~12	4000
CXSD6295	SOP8P TDFN3x3-10	VM	1	1	20	3	13.2	0.8	5~12	2500
CXSD6296A\|B\|C\|D	SOP8P	VM	1	1	25	3	13.2	0.6\|0.8	5~12	1200
CXSD6297	TDFN3x3-10	VM	1	1	25	4	13.2	0.8	5~12	2000
CXSD6298	TDFN3x3-10	COT	1	1	25	4.5	25	0.6	5~12	80
CXSD6299\|A	SOP-8P	VM	1	1	25	4.5	13.2	0.8	5~12	16000
CXSD62100	TQFN3x3-10	VM	1	1	25	4.5	13.2	0.6	5~12	2500
CXSD62101\|L	TDFN3x3-10	COT	1	1	30	3	25	0.8	5~12	2000
CXSD62102	TQFN3x3-16	COT	1	1	30	1.8	28	0.6	5	600
CXSD62102A	TQFN 3x3 16	COT	1	1	30	1.8	28	0.6	5	600
CXSD62103	QFN4x4-24	VM	2	1	50	4.5	13.2	0.6	5~12	5000
CXSD62104	TQFN4x4-24	COT	1	2	15	6	25	2	N	550
CXSD62105	TQFN4x4-24	COT	1	2	15	6	25	2	N	550
CXSD62106\|A	TQFN4x4-4 TQFN3x3-20	COT	1	2	20	3	28	0.75	5	800
CXSD62107	TQFN3x3-16	COT	1	1	20	1.8	28	0.75	5	400
CXSD62108	QFN3.5x3.5-14 TQFN3x3-16	COT	1	1	20	1.8	28	0.75	5	400
CXSD62109	TQFN3x3-16	COT	1	2	20	1.8	28	0.75	5	400
CXSD62110	QFN3x3-20 TQFN3x3-16	COT	1	2	20	3	28	1.8\|1.5\|0.5	5	740
CXSD62111	TQFN4x4-24 \|QFN3x3-20	CM	1	2	15	5	28	0.5	N	3000
CXSD62112	TDFN3x3-10	COT	1	1	20	1.8	28	0.5	5	250
CXSD62113\|C	TQFN3x3-20	COT	1	2	15	6	25	2	N	550
CXSD62113E	TQFN 3x3 20	COT	2	2	11	6	25	2	N	550
CXSD62114	TQFN3x3-20	COT	2	2	11	5.5	25	2	N	280
CXSD62115	QFN4x4-24	VM	2	1	60	3.1	13.2	0.85	12	5000
CXSD62116A\|B\|C	SOP-8P	VM	1	1	20	2.9	13.2	0.8	12	16000
CXSD62117	SOP-20	VM	2	2	30	10	13.2	1	12	5000
CXSD62118	TDFN3x3-10	COT	1	1	25	1.8	28	0.7	5	250
CXSD62119	TQFN3x3-20	COT	2	1	40	1.8	25	REFIN Setting	5	700
CXSD62120	QFN 3x3 20 TQFN 3x3 16	COT	1	2	20	3	28	1.8\|1.5 1.35\|1.2 0.5	5	800
CXSD62121A	TQFN3x3 20	COT	1	2	15	3	28	0.75	5	220
CXSD62121B	TQFN3x3 20	COT	1	2	15	3	28	0.75	5	220
CXSD62121	TQFN3x3-20	COT	1	2	20	3	28	0.75	5	180

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上一篇：CXSD6275两相PWM控制芯片它为图形卡应用中的高级图形微处理器提供了一个精确的电压调节系统功率MOSFET驱动器

下一篇：CXSD6276A单电源电压5~12V两个电源电压驱动双低成本N通道mosfet自适应穿透保护内置反馈补偿电压型PWM控制 0~100%占空比快速瞬态响应

CXSD6276是固定的300kHz频率电压模式和同步PWM控制器两个低成本N通道mosfet设计为单电源5~12V或双电源工作电压为负载瞬变提供良好的调节

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