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PDF AAT4295 Data sheet ( Hoja de datos )
| Número de pieza | AAT4295 | |
| Descripción | (AAT4295 / AAT4297) Single/Dual RGB Controller | |
| Fabricantes | AAT | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AAT4295 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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AAT4295/97
Single/Dual RGB Controller
General Description
Features
SmartSwitch™
The AAT4295/97 SmartSwitch is a member of
AnalogicTech's Application Specific Power MOS-
FET™ (ASPM™) product family. The AAT4295/97
is comprised of three/six low-side N-channel MOS-
FET switches that gate an applied load to ground.
This device is intended for controlling RGB fashion
lighting in portable products; it can also be used for
a combination of general purposes where a load
requires a low-side switch connection to ground.
The AAT4295/97 simplifies design and layout limi-
tations by eliminating the need for multiple GPIO
control lines and discrete MOSFETs to control
product features.
• Input Voltage Range: 1.8V to 5.5V
• Independent Low-Side N-Channel MOSFET
Switches:
— AAT4295: Three Channels
— AAT4297: Six Channels
• User-Programmable S2Cwire Interface
• Single GPIO Controls State of Each MOSFET
• Low Quiescent Current: 3µA Typical
• Temperature Range: -40°C to +85°C
• No External Components Required
• Available in Pb-Free Packages
— AAT4295 in 8-Pin SC70JW
— AAT4297 in 12-Pin TSOPJW
The state of each output channel is controlled with a
single GPIO line via the EN/SET pin using
AnalogicTech's Simple Serial Control™ (S2Cwire™)
interface. After a short set of data pulses is sent to
Applications
the EN/SET input and the line is pulled to logic high,
the device is enabled with the desired switch config-
uration. In the enabled state, the AAT4295/97 typi-
cally consumes less than 3µA of quiescent current.
When EN/SET is pulled to a logic low, the device iswww.DataSheet4U.com
•
•
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Cell Phones
Multiple Low Power Switching
Personal Communication Devices
Portable Electronic Devices
disabled and each output switch is placed in a high
impedance open state.
The AAT4295 and AAT4297 operate over an input
voltage range of 1.8V to 5.5V, making them ideal for
battery-powered applications. The three-switch
AAT4295 is offered in a Pb-free, 8-pin SC70JW
package, while the six-switch AAT4297 is offered in a
Pb-free, 12-pin TSOPJW package. Both devices are
rated over the -40°C to +85°C temperature range.
Typical Application
VCC
EN/SET
VCC
AAT4295/97
S1
S2
S3
EN/SET
*S4
*S5
GND *S6
D1
RB1
D2
RB2
D3
RB3
*D4
RB4
*D5
RB5
*D6
RB6
* AAT4297 Only
4295.2006.03.1.3
1
1 page  
Typical Characteristics
Quiescent Current vs. Input Voltage
3.5
3.0
85°C
2.5
2.0
1.5
-40°C
1.0 25°C
0.5
0.0
1.5 2 2.5 3 3.5 4 4.5 5 5.5
Input Voltage (V)
Off-Supply Current vs. Temperature
0.006
0.005
0.004
0.003
0.002
0.001
0.000
-40
-20
VIN = 5V
VIN = 4.2V
VIN = 3.3V
VIN = 1.8V
0 20 40 60
Temperature (°C)
80 100
3.0
2.5
2.0
1.5
1.0
-40
RDS(ON) vs. Temperature
(VIN = 3.6V; ILOAD = 20mA)
RDS6
RDS3
RDS4
RDS5
RDS2
RDS1
-20 0
20 40 60 80
Temperature (°C)
100
AAT4295/97
Single/Dual RGB Controller
Quiescent Current vs. Temperature
3.0
2.5 VIN = 5V
2.0
1.5
1.0
-40
VIN = 3.6V
-20 0
20 40 60
Temperature (°C)
80 100
RDS(ON) vs. Input Voltage
(ILOAD = 20mA)
3.5
3.0
2.5
RDS3
RDS4
RDS6
2.0
RDS1
1.5 RDS5 RDS2
1.0
1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
Input Voltage (V)
RDS(ON) vs. Temperature
(VIN = 5V; ILOAD = 20mA)
3.0
2.5 RDS4
RDS6
RDS3
2.0
1.5
1.0
-40
RDS5
RDS2
-20 0
20
RDS1
40
60
80 100
Temperature (°C)
4295.2006.03.1.3
5
5 Page 
AAT4295/97
Single/Dual RGB Controller
Sn
EN/SET
TH TL
TLAT TON
TO T OFF
Figure 3: EN/SET Timing Diagram.
Application Information
External Component Selection
The AAT4295 and AAT4297 have been designed
so that no external parts are required for the device
to function as a general purpose three- or six-posi-
tion low-side switch. For some applications, the
addition of bypass capacitors or pull-up or pull-
down resistors may be desired to improve overall
system performance.
For lighting applications, such as controlling RGB
LEDs, keypad or display backlight LEDs, or photo
flash LEDs, no bypass capacitors are necessary.
For other general purpose load switching applica-
tions which may use some or all of the outputs to
switch light load current levels to application cir-
cuits, good engineering practice would dictate the
use of small bypass capacitors placed on the VCC
input and each switch connection that is used to
conduct current from the load to ground. The use
of small ceramic capacitors between the input and
output nodes will aid in reducing line and load tran-
sient response effects when the load switch on a
given output is turned on or off.
Input Capacitor
Typically, a 0.1µF capacitor is recommended for
CIN in most applications to provide input line tran-
sient response immunity to small changes in the
input supply. A CIN capacitor is not required for
basic operation. If used, CIN should be located as
close to the device VIN pin as practically possible.
There is no specific capacitor equivalent series
resistance (ESR) requirement for CIN; however, for
higher current operation, ceramic capacitors are
recommended for CIN due to their inherent capabil-
ity over tantalum or aluminum electrolytic capaci-
tors to withstand input current surges from low
impedance sources, such as batteries in portable
devices.
Output Capacitor
For typical applications where the AAT4295/97 is
used for LED lighting control, no output capacitors
are required because the end load is not sensitive
to device turn-on or turn-off transient effects.
For improved load transient response in systems
using the AAT4295/97 for load switching, the addi-
tion of a small output capacitor placed between the
output pins and ground can have a beneficial
effect. A 0.1µF ceramic capacitor is suggested as
a reasonable value for an output capacitor.
The output capacitor has no specific capacitor type
or ESR requirement. If desired, COUT may be
increased to a value greater than 0.1µF without
limit to accommodate any load transient condition
without adversely affecting the device turn-on slew
rate time.
Thermal Considerations
The AAT4295 and AAT4297 are designed to sink a
continuous load current to ground when a respec-
tive switch is enabled via the S2Cwire control. The
limiting characteristic for maximum safe operating
load current through a given switch or set of switch-
es is package power dissipation. In order to obtain
high operating currents, careful device layout and
circuit operating conditions must be taken into
account. At any given ambient temperature (TA),
the maximum package power dissipation can be
determined by the following equation:
PD(MAX)
=
TJ(MAX) - TA
θJA
Constants for the AAT4295 are maximum junction
temperature, TJ(MAX) = 125°C, and package thermal
resistance, θJA = 225°C/W. Worst case conditions
are calculated at the maximum operating tempera-
4295.2006.03.1.3
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet AAT4295.PDF ] | |
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