A8285

更新时间： 2024-02-20 17:55:37

品牌	Logo	应用领域
急速微 - ALLEGRO		稳压器
页数	文件大小	规格书
17页	526K
描述
LNB Supply and Control Voltage Regulator

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中文翻译

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技术参数
数据手册

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A8285 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：	SOIC
包装说明：	BATWING, LEAD FREE, PLASTIC, SOIC-16	针数：	16
Reach Compliance Code：	unknown	HTS代码：	8542.39.00.01
风险等级：	5.81	模拟集成电路 - 其他类型：	ANALOG CIRCUIT
JESD-30 代码：	R-PDSO-G16	JESD-609代码：	e3
长度：	10.21 mm	湿度敏感等级：	3
功能数量：	1	端子数量：	16
最高工作温度：	85 °C	最低工作温度：	-20 °C
封装主体材料：	PLASTIC/EPOXY	封装代码：	SOP
封装等效代码：	SOP16,.4	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE	峰值回流温度（摄氏度）：	NOT SPECIFIED
电源：	10/16 V	认证状态：	Not Qualified
座面最大高度：	2.64 mm	子类别：	Power Management Circuits
最大供电电流 (Isup)：	7 mA	最大供电电压 (Vsup)：	16 V
最小供电电压 (Vsup)：	10 V	标称供电电压 (Vsup)：	12 V
表面贴装：	YES	温度等级：	OTHER
端子面层：	Matte Tin (Sn)	端子形式：	GULL WING
端子节距：	1.27 mm	端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	7.49 mm
Base Number Matches：	1

A8285 数据手册

A8285/A8287

LNB Supply and Control Voltage Regulator

Power Dissipation

ture and it rises by 2.7 mΩ/ºC with respect to the speciﬁed

ﬁgure, R_{DSBOOST(25ºC)}, when T_jequals 25ºC.

To ensure that the device operates within the safe operating

temperature range, several checks should be performed. An

approximate operating junction temperature can be deter-

mined by estimating the power losses and the thermal imped-

ance characteristics of the printed circuit board solution. To

do so, perform the following procedure:

Actual R_DSBOOST= R_{DSBOOST(25ºC)}+ [(T – 25) 2.7 mΩ]

(d) Determine losses in each block P_TOT; based on the relative

value of V_IN, perform either (i) or (ii):

1. Estimate the maximum ambient temperature (T_A).

(i) When V_IN< V_OUT+ V_D+ ∆V_REG. Note that worst case dis-

sipation occurs at minimum input voltage.

2. Deﬁne the maximum running junction temperature (T_J)of

A8285/A8287. Note that the absolute maximum junction

temperature should never exceed 150ºC.

P_TOT= Pd_Rds + Pd_sw + Pd_control + Pd_lin

where

3. Determine worst case power dissipation:

(a) Estimate the duty cycle D:

Pd_Rds = I²_PK

DSBOOST

D = 1 – [V_IN/ (V_OUT+ V_D+ ∆V_REG)]

Pd_control = 15 mA

where:

Pd_lin = ∆V_REG

LOAD

V_Dis the voltage drop of the boost diode, and

∆V_REGcan be taken from the speciﬁcation table.

(b) Estimate the peak current in boost stage I_PK:

and Pd_sw (switching losses estimate); worst case = 70 mW.

(ii) When V_IN> V_OUT+ V_D+ ∆V_REG. Note that worst case

dissipation in this case occurs at maximum input voltage.

I_PK= V_OUT[ I

/ (0.89 V )]

LOAD

P_TOT= Pd_control + Pd_lin

where:

Pd_control = 15 mA

tion temperature. R_DSBOOSTis a function of junction tempera-

Pd_lin = (V_IN– V_D– V_OUT

)

LOAD

Step 4. Determine the thermal impedance required in the

solution:

Status (I²C Read) Register Table

R_ØJA= (T_J– T_A) / P_TOT

Bit

Name

TSD

Function

Thermal Shutdown

The R_ØJAfor one or two layer PCBs can be estimated from

the R_ØJAvs. Area charts on the following page.

OCP

Overcurrent

Reserved

Note: For maximum effectiveness, the PCB area underneath

the IC should be ﬁlled copper and connected to pins 4 and

13 for A8285, and pins 6, 7, 18, and 19 for A8287. Where

a PCB with two or more layers is used, apply thermal vias,

placing them adjacent to each of the above pins, and under-

neath the IC.

PNG

DIS

Power Not Good

LNB output disabled

Reserved

VUV

V_INUndervoltage

www.allegromicro.com

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

1...8 9 101112 13 14...17

中文翻译

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与A8285相关器件

型号	品牌	描述	获取价格	数据表
A8285SLB	ALLEGRO	LNB Supply and Control Voltage Regulator	获取价格
A8285SLBTR	ALLEGRO	Analog Circuit, 1 Func, PDSO16, BATWING, PLASTIC, SOIC-16	获取价格
A8285SLBTR-T	ALLEGRO	Analog Circuit, 1 Func, PDSO16, BATWING, LEAD FREE, PLASTIC, SOIC-16	获取价格
A8286	ALLEGRO	Dual LNB Supply and Control Voltage Regulator	获取价格
A8286SETTR-T	ALLEGRO	Dual Switching Controller, Current-mode, 3.8A, 384kHz Switching Freq-Max, BCDMOS, QFN-28	获取价格
A8286SETTR-TB	ALLEGRO	Dual LNB Supply and Control Voltage Regulator	获取价格
A8287	ALLEGRO	LNB Supply and Control Voltage Regulator	获取价格
A8287SLB	ALLEGRO	LNB Supply and Control Voltage Regulator	获取价格
A8287SLBTR-T	ALLEGRO	Analog Circuit, 1 Func, PDSO24, BATWING, LEAD FREE, PLASTIC, SOIC-24	获取价格
A8290	ALLEGRO	Single LNB Supply and Control Voltage Regulator	获取价格
A8290SETTR-TB	ALLEGRO	Single LNB Supply and Control Voltage Regulator	获取价格
A8291	ALLEGRO	Single LNB Supply and Control Voltage Regulator	获取价格
A8291SETTR-TB	ALLEGRO	Single LNB Supply and Control Voltage Regulator	获取价格
A8292	ALLEGRO	Dual LNB Supply and Control Voltage Regulator	获取价格
A8292SETTR-T	ALLEGRO	Dual LNB Supply and Control Voltage Regulator	获取价格
A8293	ALLEGRO	Single LNB Supply and Control Voltage Regulator	获取价格
A8293SESTR-T	ALLEGRO	Single LNB Supply and Control Voltage Regulator	获取价格
A8293SETTR-T	ALLEGRO	Switching Regulator, Current-mode, 384kHz Switching Freq-Max, BCDMOS, QFN-28	获取价格
A8294	ALLEGRO	Single LNB Supply and Control Voltage Regulator	获取价格
A8296SESTR-T	ALLEGRO	Switching Regulator, Current-mode, 384kHz Switching Freq-Max, BCDMOS, 3 X 3 MM, 0.75 MM HE	获取价格

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