AS1582

更新时间： 2024-01-25 23:55:48

品牌	Logo	应用领域
西伯斯 - SIPEX		稳压器射频微波
页数	文件大小	规格书
4页	114K
描述
3A Ultra Low Dropout Voltage Regulator Fast Response, Adjustable & Fixed

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技术参数
数据手册

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AS1582 技术参数

是否Rohs认证：	不符合	生命周期：	Transferred
Reach Compliance Code：	unknown	风险等级：	5.67
Is Samacsys：	N	可调性：	ADJUSTABLE
标称回动电压 1：	0.5 V	JESD-609代码：	e0
最大电网调整率 (%/V)：	0.07	最大负载调整率 (%)：	0.4%
输出次数：	1	端子数量：	5
工作温度TJ-Max：	125 °C	工作温度TJ-Min：
最大输出电流 1：	3 A	最大输出电压 1：	5 V
最小输出电压 1：	1.25 V	封装主体材料：	PLASTIC/EPOXY
封装等效代码：	SIP5,.1,67TB	认证状态：	Not Qualified
子类别：	Other Regulators	表面贴装：	NO
技术：	BIPOLAR	端子面层：	Tin/Lead (Sn/Pb)
端子节距：	1.7 mm	端子位置：	SINGLE
Base Number Matches：	1

AS1582 数据手册

AS1582

PIN DESCRIPTION

1. Sense = Allows Kelvin sense of V_OUTat the load. (Positive side of the reference voltage of the

device).

2. ADJ = Negative side of the reference voltage for the device. Adding a small bypass capacitor

from the ADJ pin to ground will improve the transient response.

_OUT= Power output of the device.

_CTRL= Supply pin for the control circuitry of the device. The current flow into this pin will be

about 1% of the output current. V_CTRLmust be between 1.0V and 1.3V greater than the output

voltage for the device to regulate.

5. V_IN= Output load current is supplied through this pin. V_INmust be between 0.1V and 0.8V

greater than the output voltage for the device to regulate.

BLOCK DIAGRAM

(4) V_CTRL

V_IN(5)

S.O.A

CURRENT

LIMIT

AMPLIFIER

V_OUT(3)

SENSE (1)

ADJ (2)

SENSE

THERMAL OVERLOAD

VOLTAGE

REGULATION

AMPLIFIER

V_REF

APPLICATIONS NOTES

The AS1582 is designed as a high performance and low cost

solution for application requiring a lower dropout than

traditional NPN regulators.

Adjustable Regulator Design

1.25V reference voltage is being developed between the

SENSE pin and the ADJ pin of the AS1582. Adding two

external resistors (see fig 1.) will allow setting the output

voltage from 1.25V to 6V. R₁is chosen so that this current is

specified minimum load current of 10mA. R₂is given by the

formula: V_OUT= V_REF(1+ R₂/R₁) + I_ADJ(R₂). The current

flowing from the ADJ pin is typically 50µA. This ADJ pin

contributes to the final VOUT but is usually neglected.

Connecting the sense pin to the top of the resistor divider will

improve load regulation.

The AS1582 uses a separate input voltage V_CTRL(V_CTRL

≥

_OUT+ 1.3V) to minimize the dropout voltage. This allows the

2.5V power for the load to come from a 3.3V system supply.

As added benefit this will reduce the heat dissipation, and

lower heatsink and cooling fan cost. A typical application

would use 5V for Vin and 3.3V for V_CTRLfrom a motherboard

power supply to provide a nominal 2.5V output. Using the

sense pin allows to Kelvin measure the output, reducing

resistive-associated errors.

The AS1582 can power the 2.5V core voltage for

microprocessors such as Pentium, P55C, AMD5k86

and K6 and the IBM PowerPC 603EV and 604EV

processors.

Lowering Noise

Using the SENSE pin to Kelvin the load will increase accuracy

of the output voltage during load regulation. For the fixed

voltage devices, adding a capacitor at the GND pin will

improve transient response. This capacitor is chosen in the

range of 1µF to 0.1µF and will depend on the amount of

output capacitance in the system.

*The reduction of heat dissipation is a result of the increase of the regulator

efficiency (efficiency = V_OUT/ V_IN).

Rev. 10/2/00

1 234

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