Datasheet > AAT3258ITS-2.8-R-T1

AAT3258ITS-2.8-R-T1

更新时间： 2024-02-13 21:34:14

品牌	Logo	应用领域
ANALOGICTECH		稳压器
页数	文件大小	规格书
17页	252K
描述
300mA LDO Linear Regulator with UP Reset

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AAT3258ITS-2.8-R-T1 技术参数

是否Rohs认证：	符合	生命周期：	Active
包装说明：	TSOPJW-8	Reach Compliance Code：	unknown
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.83	可调性：	FIXED
最大回动电压 1：	0.6 V	标称回动电压 1：	0.4 V
最大绝对输入电压：	6 V	最大输入电压：	5.5 V
最小输入电压：	3.47 V	JESD-30 代码：	R-PDSO-J8
长度：	3.025 mm	最大电网调整率：	0.003024%
功能数量：	1	输出次数：	1
端子数量：	8	工作温度TJ-Max：	150 °C
工作温度TJ-Min：	-40 °C	最高工作温度：	85 °C
最低工作温度：	-40 °C	最大输出电压 1：	2.87 V
最小输出电压 1：	2.73 V	标称输出电压 1：	2.8 V
封装主体材料：	PLASTIC/EPOXY	封装代码：	TSOJ
封装等效代码：	TSSOJ8,.11	封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, THIN PROFILE	包装方法：	TR
调节器类型：	FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR	座面最大高度：	1.0175 mm
表面贴装：	YES	端子形式：	J BEND
端子节距：	0.65 mm	端子位置：	DUAL
最大电压容差：	2.5%	宽度：	2.4 mm

AAT3258ITS-2.8-R-T1 数据手册

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AAT3258

300mA LDO Linear Regulator with µP Reset

When the LDO regulator is in the shutdown mode,

avoided since this would forward bias the internal

parasitic diode and allow excessive current flow into

the V_OUTpin, possibly damaging the LDO regulator.

an internal 1.5kΩ resistor is connected between

V_OUTand GND. This is intended to discharge C_OUT

when the LDO regulator is disabled. The internal

1.5kΩ has no adverse effect on device turn-on time.

In applications where there is a possibility of V_OUT

exceeding V_INfor brief amounts of time during nor-

mal operation, the use of a larger value C_INcapaci-

tor is highly recommended. A larger value of C_IN

with respect to C_OUTwill effect a slower C_INdecay

rate during shutdown, thus preventing V_OUTfrom

exceeding V_IN. In applications where there is a

greater danger of V_OUTexceeding V_INfor extended

periods of time, it is recommended to place a

Schottky diode across V_INto V_OUT(connecting the

cathode to V_INand anode to V_OUT). The Schottky

diode forward voltage should be less than 0.45 volts.

Short-Circuit Protection

The LDO regulator section contains an internal

short-circuit protection circuit that will trigger when

the output load current exceeds the internal

threshold limit. Under short-circuit conditions, the

output of the LDO regulator will be current limited

until the short-circuit condition is removed from the

output or the LDO regulator package power dissi-

pation exceeds the device thermal limit.

Thermal Protection

The AAT3258 has an internal thermal protection cir-

cuit which will turn on when the device die temper-

ature exceeds 145°C. The internal thermal protec-

tion circuit will actively turn off the LDO regulator

output pass device to prevent the possibility of over-

temperature damage. The LDO regulator output

will remain in a shutdown state until the internal die

temperature falls back below the 145°C trip point.

MicroPower Supervisory Circuit

Applications

Reset Output Options

The reset pin is an active low push-pull output. In

the event of a power down or brown-out condition,

the reset signal remains valid until the V_DETdrops

below 1.2V.

The combination and interaction between the short-

circuit and thermal protection systems allows the

LDO regulator to withstand indefinite short-circuit

conditions without sustaining permanent damage.

Manual Reset Input

A logic low signal on MR asserts a reset condition.

Reset continues to be asserted as long as MR is low

and for a minimum of 150ms after MR returns high.

This input is internally pulled up to V_CCvia a 20kΩ

resistor, so leaving the pin unconnected is accept-

able if a manual reset function is not needed. The

MR input is internally debounced, which allows use

of a mechanical switch. It should be a normally-

open momentary switch connected from MR to

GND. Additionally, the MR pin can be driven from

TTL, CMOS, or open drain logic outputs.

No-Load Stability

The LDO regulator is designed to maintain output

voltage regulation and stability under operational

no-load conditions. This is an important character-

istic for applications where the output current may

drop to zero.

Reverse Output-to-Input Voltage

Conditions and Protection

Under normal operating conditions, a parasitic diode

exists between the output and input of the LDO reg-

ulator. The input voltage should always remain

greater than the output load voltage, maintaining a

reverse bias on the internal parasitic diode.

Conditions where V_OUTmight exceed V_INshould be

Supply Voltage Transient Behavior

In some cases, fast negative transients of short

duration can appear on the V_CCpower supply. The

AAT3258 series device provides some immunity to

line transients which can generate invalid reset

3258.2005.04.1.5

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