DC/DC Convertor. CX8822 Datasheet

CX8822 Convertor. Datasheet pdf. Equivalent

CX8822 Datasheet
Recommendation CX8822 Datasheet
Part CX8822
Description Step-Down DC/DC Convertor
Feature CX8822; .
Manufacture High-Neon
Datasheet
Download CX8822 Datasheet





High-Neon CX8822
High-Neon microeconomics Inc.
CX8822
33V 3A, CV&CC Synchronous Step-Down DC/DC Convertor
概述
特点
CX8822是一款输入耐压可达33V,并且
能够实现精确恒压以及恒流的降压型DC-DC
转换器
CX8822内置50mΩ High-side PMOS
以及30mΩ Low-side NMOS,可支持3A
续输出电流
CX8822 具 备 高 性 能 的 负 载 响 应 以 及 输
入电压响应能力,同时精确的恒压和恒流控制
环路实现极小的负载调整率和线性调整率
CX8822无需外部补偿,可以依靠自身内
置稳定环路实现恒流以及恒压控制,同时具备
线缆压降补偿功能
CX8822是一款应用极简,性能卓越,稳
定可靠的恒压恒流降压型DC-DC转换器
- 高性价比车载充电器方案
- 输入耐压可达35V
- 内置50mΩ High-side PMOS
- 内置30mΩ Low-side NMOS
- 可支持3A持续输出电流
- 内置高精度恒流以及恒压控制环路
- 恒流精度 ±7%
- 恒压精度 ±2%
- 无需外部补偿
- 135k Hz固定开关频率
- 线缆补偿压降
- 超简洁应用线路
- 短路保护(SCP),过热保护(OTP),过
压保护(OVP)以及欠压保护(UVLO
- SOP-8L封装形式
典型应用
VIN
GND
VIN
SW
C1
50V
47uF
C2
50V
1uF
ISEN
VOUT
GND
L1
3.5A&33uH
RSEN
20mΩ
5.1V 2.5A
OUT+
C4
16V
220uF
C5
6.3V
4.7uF
OUT-
Page1-6
Rev. 1.0 Mar-06-2013



High-Neon CX8822
High-Neon microeconomics Inc.
引脚定义
CX8822
33V 3A, CV&CC Synchronous Step-Down DC/DC Convertor
VOUT 1
ISEN 2
NC 3
VIN 4
CX8822
SOP-8L
8 GND
7 GND
6 SW
5 SW
IN
1
2
3
4
5, 6
78
NAME
VOUT
ISEN
NC
VIN
SW
GND
DISCRIPTION
Output Voltage Sense Input
Output Current Sense Input
Not Connected
Power Supply Input. Bypass this pin with a 1μF ceramic
capacitor and 47uF electrolytic capacitor to GND, placed as
close to the IC as possible.
Switch, Connect to the Inductor
Ground
额定电气参数 (at TA = 25°C)
Characteristics
VIN to GND
SW to GND
VOUT, ISEN to GND
Junction to Ambient Thermal Resistance
Operating Junction Temperature
Storage Junction Temperature
Lead Temperature (Soldering 10 sec.)
Symbol
Rating
-0.3 to 33
-0.3 to 33
-0.3 to + 20
105
-40 to 150
-55 to 150
260
Unit
V
V
V
°C/W
°C
°C
°C
Page2-6
Rev. 1.0 Mar-06-2013



High-Neon CX8822
High-Neon microeconomics Inc.
CX8822
33V 3A, CV&CC Synchronous Step-Down DC/DC Convertor
规格参数
Characteristics
Input Voltage
UVLO Voltage
UVLO Hysteresis
Quiescent Current
Standby Current
Output Voltage
Ouput OVP Voltage
Switching Frequency
Maximum Duty Cycle
Minimum On-Time
Reference Voltage Of
ISEN
Cable Compensation
Scale
Vout 5.1V
ISEN VOUT
VOUT-Short
Power Mos
Thermal shutdown
Temp
Thermal Shutdown
Hysteresis
Symbol
VIN
VUVLO
Conditions
ICCQ
VFB = 1.5V, force
driver off.
ISB No Load
OVP
FSW
Internal define
CX8822
IOUT=200mA
VISEN
VVOUT
2.5V<VOUT<5V
VISEN-VVOUT<50mV
VOUT-Short
High-Side
Low-Side
TJ=25
TSD
TSH
Min
7.5
6.5
0.3
-
-
5.03
-
120
-
-
47
-
2
45
25
-
-
Typ
-
6.8
0.5
1500
1.5
5.1
6.5
135
100
350
50
5
2.2
50
30
140
30
Max Units
33 V
7.2 V
0.8 V
- uA
2
5.17
-
mA
V
V
150 KHz
-%
- ns
53 mV
-
2.5 V
60 mΩ
37 mΩ
- °C
- °C
功能描述
UVLO
CX8822 VIN耐压可达33V,可以在7.5~30范围内工作。当VIN0V升至7.5V后,CX8822
启动,VIN下降至7V以下时,CX8822则停止工作。
系统软启动
CX8822刚刚上电或者经过短路保护后重启时,内部恒压和恒流参考源都会从0开始
经过300uS缓慢升至预设值,以此避免刚刚启动时系统上出现过大的冲击电流。
恒压输出
CX8822内部反馈和PWM环路,将输出电压稳定在5.1V
Page3-6
Rev. 1.0 Mar-06-2013





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