Datasheet > AAT1272IWO-T1

AAT1272IWO-T1

更新时间： 2024-02-24 17:27:05

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ANALOGICTECH		/
页数	文件大小	规格书
20页	2644K
描述
Switching Regulator/Controller,

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AAT1272IWO-T1 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.83
接口集成电路类型：	LED DISPLAY DRIVER	峰值回流温度（摄氏度）：	NOT SPECIFIED
处于峰值回流温度下的最长时间：	NOT SPECIFIED	Base Number Matches：	1

AAT1272IWO-T1 数据手册

PRODUCT DATASHEET

AAT1272

SwitchReg

1.5A Step-Up Current Regulator for Flash LEDs

the output ripple and, as a result, less input capacitance

is required.

Selecting the Boost Capacitors

In general, it is good design practice to place a decou-

pling capacitor (input capacitor) between the IN and GND

pins. An input capacitor in the range of 2.2ꢀF to 10ꢀF is

recommended. A larger input capacitor in this application

may be required for stability, transient response, and/or

ripple performance. The high output ripple inherent in

the boost converter necessitates the use of low imped-

ance output filtering. Multi-layer ceramic (MLC) capaci-

tors provide small size and adequate capacitance, low

parasitic equivalent series resistance (ESR) and equiva-

lent series inductance (ESL), and are well suited for use

with the AAT1272 boost regulator. MLC capacitors of type

X7R or X5R are recommended to ensure good capaci-

tance stability over the full operating temperature range.

The output capacitor is selected to maintain the output

load without significant voltage droop (∆V_OUT) during the

power switch ON interval. A 2.2ꢀF ceramic output capac-

itor is recommended (see Table 7). Typically, 6.3V or 10V

rated capacitors are required for this flash LED boost

output. Ceramic capacitors selected as small as 0603 are

available which meet these requirements. MLC capacitors

exhibit significant capacitance reduction with applied

voltage. Output ripple measurements should confirm

that output voltage droop and operating stability are

within acceptable limits. Voltage derating can minimize

this factor, but results may vary with package size and

among specific manufacturers. To maintain stable opera-

tion at full load, the output capacitor should be selected

to maintain ∆V_OUTbetween 100mV and 200mV. The boost

converter input current flows during both ON and OFF

switching intervals. The input ripple current is less than

PCB Layout Guidelines

Boost converter performance can be adversely affected

by poor layout. Possible impact includes high input and

output voltage ripple, poor EMI performance, and

reduced operating efficiency. Every attempt should be

made to optimize the layout in order to minimize para-

sitic PCB effects (stray resistance, capacitance, and

inductance) and EMI coupling from the high frequency

SW node. A suggested PCB layout for the AAT1272 1.5A

step-up regulator is shown in Figures 4 and 5. The fol-

lowing PCB layout guidelines should be considered:

1. Minimize the distance from capacitor CIN and COUT’s

negative terminals to the PGND pins. This is espe-

cially true with output capacitor C^OUT, which conducts

high ripple current from the output to the PGND pins.

2. Minimize the distance under the inductor between IN

and switching pin SW; minimize the size of the PCB

area connected to the SW pin.

3. Maintain a ground plane and connect to the IC PGND

pin(s) as well as the PGND connections of C_INand

C_OUT

4. Consider additional PCB exposed area for the flash

LEDs to maximize heatsinking capability. This may

be necessary when using high current application

and long flash duration application.

5. Connect the exposed paddle (bottom of the die) to

either PGND or GND. Connect AGND, FLGND to GND

as close as possible to the package.

Inductance

Saturated Rated

DCR

(mΩ)

Size (mm)

LxWxH

Manufacturer

Part Number

(μH)

Current (A)

Type

Cooper Bussmann

Sumida

SD3812-1R0-R

SDH3812-1R0-R

SD10-1R0-R

CDH38D11/S

LPS4012-102NLC

2.69

2.25

2.8

2.5

44.8

48.8

4.0x4.0x1.2

3.8x3.8x1.2

5.2x5.2x1.0

4.0x4.0x1.2

4.1x4.1x1.2

Shielded Drum Core

Coilcraft

Table 6: Typical Suggested Surface Mount Inductors.

Manufacturer

Part Number

Capacitance (ꢀF)

Voltage Rating (V)

Temp Co.

Case Size

GRM185R60J225KE26

GRM188R71A225KE15

GRM21BR70J225KA01

GRM21BR71A225KA01

GRM219R61A475KE19

GRM21BR71A106KE51

2.2

4.7

6.3

X5R

X7R

X5R

X7R

0603

0805

Murata

Table 7: Typical Suggested Surface Mount Capacitors.

w w w . a n a l o g i c t e c h . c o m

1272.2009.04.1.2

1...13 14 151617 18 19 20

中文翻译

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