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A8286

更新时间： 2024-01-28 17:18:11
品牌 Logo 应用领域
急速微 - ALLEGRO 稳压器
页数 文件大小 规格书
19页 412K
描述
Dual LNB Supply and Control Voltage Regulator

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A8286 技术参数

是否无铅：不含铅是否Rohs认证：符合
生命周期：Obsolete零件包装代码：QFN
包装说明：QFN-28针数：28
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.79
Is Samacsys：N其他特性：ALSO OPERATES IN ADJUSTABLE MODE FROM 19V TO 21V
模拟集成电路 - 其他类型：DUAL SWITCHING CONTROLLER控制模式：CURRENT-MODE
最大输入电压：16 V最小输入电压：8 V
标称输入电压：10 VJESD-30 代码：S-XQCC-N28
JESD-609代码：e3长度：5 mm
湿度敏感等级：2功能数量：1
端子数量：28最高工作温度：85 °C
最低工作温度：-20 °C最大输出电流：3.8 A
封装主体材料：UNSPECIFIED封装代码：HVQCCN
封装等效代码：LCC28,.2SQ,20封装形状：SQUARE
封装形式：CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE峰值回流温度（摄氏度）：NOT SPECIFIED
电源：8/16 V认证状态：Not Qualified
座面最大高度：1 mm子类别：Power Management Circuits
最大供电电流 (Isup)：20 mA表面贴装：YES
切换器配置：PHASE-SHIFT最大切换频率：384 kHz
技术：BCDMOS温度等级：OTHER
端子面层：Matte Tin (Sn)端子形式：NO LEAD
端子节距：0.5 mm端子位置：QUAD
处于峰值回流温度下的最长时间：NOT SPECIFIED宽度：5 mm
Base Number Matches：1

A8286 数据手册

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A8286  
Dual LNB Supply and Control Voltage Regulator  
Features and Benefits  
Description  
▪ 2-wire serial I2C™ -compatible interface: control (write)  
and status (read)  
Intended for analog and digital satellite receivers, this dual  
low-noise block converter regulator (LNBR) is a monolithic  
linearandswitchingvoltageregulator, specificallydesignedto  
provide the power and the interface signals to two LNB down  
convertersviacoaxialcables.TheA8286requiresfewexternal  
components,withtheboostswitchesandcompensationcircuitry  
integrated inside of the device. A high switching frequency is  
chosentominimizethesizeofthepassivefilteringcomponents,  
furtherassistingincostreduction.Thehighlevelofcomponent  
integration ensures extremely low noise and ripple figures.  
▪ LNB voltages (16 programmable levels) compatible with  
all common standards  
▪ Tracking switch-mode power converter for lowest dissipation  
▪ Integrated converter switches and current sensing  
▪ Provides up to 650 mA per channel and 1.0 A total  
continuous load current  
▪ Provides up to 700 mA per channel and 1.1 A total for 2000 ms  
▪ Output current limit of 900 mA typical, with 48 ms timer  
▪ Static current limit circuit allows full current at startup and  
13→18V output transition; reliably starts wide load range  
▪ Push-pull output stage minimizes 13→18V and 18→13V  
output transition times for highly capacitive loads  
▪ Adjustable rise/fall time via external timing capacitor  
▪ Built-in tone oscillator, factory-trimmed to 22 kHz  
facilitates DiSEqC™ tone encoding, even at no-load  
▪ Four methods of 22 kHz tone generation, via I2C™ data  
bits and/or external pin  
The A8286 has been designed for high efficiency, utilizing  
the Allegro® advanced BCD process. The integrated boost  
switches have been optimized to minimize both switching and  
static losses. To further enhance efficiency, the voltage drop  
across the tracking regulators has been minimized.  
TheA8286 has integrated tone detection capability, to support  
full two-way DiSEqC™ communications. Several schemes  
are available for generating tone signals, all the way down  
to no-load, and using either the internal clock or an external  
time source.  
▪ 22 kHz tone detector facilitates DiSEqC™ 2.0 decoding  
▪ Auxiliary modulation input  
▪ LNB overcurrent with timer  
▪ Provides VOUT within 19 to 21 VDC at 700 mA for  
SWM (single wire multiswitch) operation  
▪ Diagnostics for output voltage level, input supply UVLO,  
and DiSEqC™ tone output  
▪ Cable disconnect diagnostic  
Continued on the next page…  
Package:  
28 pin 5 mm × 5mm  
QFN/MLP (suffix ET)  
Functional Block Diagram  
V
S
A
C2  
100 MF  
Channel 1  
L1  
33 MH  
L3  
1 MH  
D1  
V
DD  
C6  
C5  
C4  
100 nF  
1 MF  
100 MF  
R4  
TDO1 EXTM1  
R5  
LX1  
GNDLX1  
BOOST1 VCP1  
A
B
D3  
C
A8286  
Channel 1 of 2 channels shown.  
R8-C11 network is needed only when high  
inductive load is applied, such as ProBrand LNB.  
Charge  
Pump  
C12  
D
VIN  
Boost  
Converter  
C
D
D3 and D4 are used for surge protection.  
C1  
100 nF  
Either C12 or C9 should be used, but not both.  
VREG  
TMode1  
EXTM1  
R6  
15 7  
Regulator  
VPump  
C3  
Fsw  
220nF  
LNB  
Voltage  
Control  
V
OUT1  
LNB1  
Wave  
Shape  
Linear  
Stage  
DAC  
L2  
220 MH  
C8  
220 nF  
R3  
TCAP1  
D2  
R2  
C9  
D4  
C
TGate1  
C13  
10 nF  
R1  
220 nF  
R8  
30  
7
D
SDA  
SCL  
Fsw  
Fault Monitor  
TCAP1  
C11  
0.68  
OCP1  
OCP2  
PNG1  
PNG2  
TSD  
M
F
Clock  
Divider  
2
Cꢀ  
Compatible  
Interface  
I
22 kHz  
C7  
10 nF  
B
Oscillator  
TDO1  
VUV  
TDI1  
Tone  
Detect  
IRQ  
R7  
100 7  
C10  
10 nF  
PAD  
GND  
8286-DS, Rev. 3  
1234567...19

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