AATIAN76 Datasheet, PDF (1/8 Pages) SiGe Semiconductor, Inc. – Dual Slew Rate Controlled Load Switch

EV-140
AAT4282A EVAL:
Dual Slew Rate Controlled Load Switch
Introduction
The AAT4282A evaluation board provides a platform for test and evaluation of the AAT4282A Dual Slew Rate
Controlled Load Switch. The evaluation board demonstrates suggested size and placement of external com-
ponents to achieve the best performance. The external components are limited and selected for small size to
suit portable devices applications while the layout has been optimized to achieve optimum thermal character-
istics with the TDFN22-8 package and low inductive output ringing with the fast slew rate setting. The design
operates across an input voltage range from 1.5 to 6.5V.
The AAT4282A Evaluation Board provides independent dual inputs and outputs with either a 0.1ms or 1ms turn-
on slew rate. The desired turn-on slew rate time is determined by setting the logic level of the FAST pin.
Connecting the FAST pin to Logic high (VIN) sets the output to fast turn-on slew rate while logic low (GND) sets
the output to slow turn-on slew rate. Connecting ENA or ENB to logic "1" enables the switch and initiates the
turn-on slew rate features while connecting ENA or ENB to GND will disable either A or B channel respectively.
This document provides details on the operation and test of the AAT4282A Evaluation Board with a single or
separate input power supplies by using the JP1 jumper.
Operating Specification, Schematic and BOM
INA
JP1
INB
ENA
ENB
1
INA
TDFN22-8
OUTA ⁸
4 _INB
OUTB ⁵
2
ENA
AAT4282 A
C1
C2
C3
0.1μF
C4
0.1μF
1μF
1μF
FAST
7
FAST
3
ENB
GND
8,9,10,11
OUTA
OUTB
Figure 1: AAT4282A Evaluation Board Schematic (AAT4282A-IPS-3-DB1).
EV-140.2007.08.1.0
1