Datasheet > AS2886AT

AS2886AT

更新时间： 2024-02-08 04:28:43

品牌	Logo	应用领域
西伯斯 - SIPEX		/
页数	文件大小	规格书
6页	154K
描述
Adjustable Positive LDO Regulator, 1.2V Min, 1.2V Dropout, PSSO2, PLASTIC, TO-263, 3 PIN

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AS2886AT 技术参数

是否Rohs认证：	不符合	生命周期：	Obsolete
包装说明：	PLASTIC, TO-263, 3 PIN	Reach Compliance Code：	unknown
风险等级：	5.75	Is Samacsys：	N
最大回动电压 1：	1.2 V	最大差分输入-输出电压：	5.75 V
最小差分输入-输出电压：	1.5 V	JESD-30 代码：	R-PSSO-G2
长度：	10.287 mm	湿度敏感等级：	1
功能数量：	1	端子数量：	2
工作温度TJ-Max：	125 °C	工作温度TJ-Min：	-45 °C
最大输出电流 1：	1.5 A	最小输出电压 1：	1.2 V
封装主体材料：	PLASTIC/EPOXY	封装代码：	TO-263
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	225	认证状态：	Not Qualified
调节器类型：	ADJUSTABLE POSITIVE SINGLE OUTPUT LDO REGULATOR	座面最大高度：	4.597 mm
表面贴装：	YES	端子形式：	GULL WING
端子节距：	2.6 mm	端子位置：	SINGLE
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	9.04 mm
Base Number Matches：	1

AS2886AT 数据手册

AS2886

APPLICATION HINTS

Reducing parasitic resistance and inductance

The AS2886 incorporates protection against over-current

faults, reversed load insertion, over temperature operation, and

positive and negative transient voltage. However, the use of

an output capacitor is required in order to insure the stability

and the performances.

One solution to minimize parasitic resistance and inductance is

to connect in parallel capacitors. This arrangement will

improve the transient response of the power supply if your

system requires rapidly changing current load condition.

Stability

Thermal Consideration

The output capacitor is part of the regulator’s frequency

compensation system. Either a 220µF aluminum electrolytic

capacitor or a 47µF solid tantalum capacitor between the

output terminal and ground guarantees stable operation for all

operating conditions.

Although the AS2886 offers some limiting circuitry for

overload conditions, it is necessary not to exceed the

maximum junction temperature, and therefore to be careful

about thermal resistance. The heat flow will follow the lowest

resistance path, which is the Junction-to-case thermal

resistance. In order to insure the best thermal flow of the

component, a proper mounting is required. Note that the case

of the device is electrically connected to the output. In case

the case has to be electrically isolated, a thermally conductive

spacer can be used. However do not forget to consider its

contribution to thermal resistance.

However, in order to minimize overshoot and undershoot, and

therefore optimize the design, please refer to the section

‘Ripple Rejection’.

Ripple Rejection

Ripple rejection can be improved by adding a capacitor

between the ADJ pin and ground. When ADJ pin bypassing is

used, the value of the output capacitor required increases to its

maximum (220µF for an aluminum electrolytic capacitor, or

47µF for a solid tantalum capacitor). If the ADJ pin is not

bypass, the value of the output capacitor can be lowered to

100µF for an electrolytic aluminum capacitor or 15µF for a

solid tantalum capacitor.

Assuming:

_IN= 10V, V_OUT= 5V, I_OUT= 1.5A, T_A= 50°C/W,

θ_{Heatsink Case}= 6°C/W, θ_{Heatsink Case}= 0.5°C/W, θ _JC= 3°C/W

Power dissipation under this condition

P_D= (V_IN– V_OUT) * I_OUT= 7.5W

Junction Temperature

T_J= T_A+ P_D* (θ _{Case – HS}+ θ _HS+ θ _JC)

However the value of the ADJ-bypass capacitor should be

chosen with respect to the following equation:

C = 1 / ( 6.28 * F_R* R₁)

For the Control Sections

T_J= 50 + 7.5*(0.5+6=3) = 121.25°C

121.25°C < T_J(max)for the Control & Power Sections.

Where C

= value of the capacitor in Farads (select an

equal or larger standard value),

F_R= ripple frequency in Hz,

R₁= value of resistor R₁in Ohms.

In both case reliable operation is insured by adequate junction

temperature.

If an ADJ-bypass capacitor is use, the amplitude of the output

ripple will be independent of the output voltage. If an ADJ-

bypass capacitor is not used, the output ripple will be

proportional to the ratio of the output voltage to the reference

voltage:

M = V_OUT/ V_REF

Where M = multiplier for the ripple seen when the ADJ pin

is optimally bypassed.

V_REF= Reference Voltage

Rev. 10/11/00

1 234 5 6

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与AS2886AT相关器件

型号	品牌	描述	获取价格	数据表
AS2886AT-1.5	ETC	Analog IC	获取价格
AS2886AT-2.0	CALOGIC	Fixed Positive LDO Regulator, 2V, 1.2V Dropout, PSSO2, PLASTIC, TO-263, D2PAK-3	获取价格
AS2886AT-2.2	ETC	Analog IC	获取价格
AS2886AT-2.5	CALOGIC	Fixed Positive LDO Regulator, 2.5V, 1.2V Dropout, PSSO2, PLASTIC, TO-263, D2PAK-3	获取价格
AS2886AT-3.0	CALOGIC	Fixed Positive LDO Regulator, 1.2V Dropout, PSSO2, PLASTIC, TO-263, D2PAK-3	获取价格
AS2886AT-3.3	CALOGIC	Fixed Positive LDO Regulator, 3.3V, 1.2V Dropout, PSSO2, PLASTIC, TO-263, D2PAK-3	获取价格

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