Datenblatt-pdf.com


AAT3218IJS-3.5-T1 Schematic ( PDF Datasheet ) - ETC

Teilenummer AAT3218IJS-3.5-T1
Beschreibung 150mA MicroPower High Performance LDO
Hersteller ETC
Logo ETC Logo 




Gesamt 18 Seiten
AAT3218IJS-3.5-T1 Datasheet, Funktion
AAT3218
150mA MicroPower™ High Performance LDO
General Description
The AAT3218 MicroPower™ Low Dropout Linear
Regulator is ideally suited for portable applications
where very fast transient response, extended battery
life and small size are critical. The AAT3218 has
been specifically designed for high speed turn on and
turn off performance, fast transient response, good
power supply ripple rejection (PSRR) and is reason-
ably low noise, making it ideal for powering sensitive
circuits with fast switching requirements.
Other features include low quiescent current, typical-
ly 70µA, and low dropout voltage which is typically
less than 200mV at the maximum output current level
of 150mA. The device is output short circuit protect-
ed and has a thermal shutdown circuit for additional
protection under extreme operating conditions.
The AAT3218 also features a low-power shutdown
mode for extended battery life. A reference bypass
pin has been provided to improve PSRR perform-
ance and output noise, by connecting a small
external capacitor from the AAT3218's reference
output to ground.
The AAT3218 is available in a space saving 5-pin
SOT23 or 8-pin SC70JW package in 16 factory
programmed voltages of 1.2V, 1.4V, 1.5V, 1.8V,
1.9V, 2.0V, 2.3V, 2.5V, 2.6V, 2.7V, 2.8V, 2.85V,
2.9V, 3.0V, 3.3V or 3.5V.
Features
PowerLinear
• Low Dropout - 200mV at 150mA
• Guaranteed 150mA Output
• High accuracy ±1.5%
• 70µA Quiescent Current
• Fast line and load transient response
• High speed device turn-on and shutdown
• High Power Supply Ripple Rejection
• Low self noise
• Short circuit protection
• Over-Temperature protection
• Uses Low ESR ceramic capacitors
• Output noise reduction bypass capacitor
• Shutdown mode for longer battery life
• Low temperature coefficient
• 16 Factory programmed output voltages
• SOT23 5-pin or SC70JW 8-pin package
Applications
• Cellular Phones
• Notebook Computers
• Portable Communication Devices
• Personal Portable Electronics
• Digital Cameras
Typical Application
VIN
IN OUT
AAT3218
VOUT
ON/OFF
EN
BYP
GND
1µF
10nF
2.2µF
GND
GND
3218.2004.02.1.0
1






AAT3218IJS-3.5-T1 Datasheet, Funktion
AAT3218
150mA MicroPower™ High Performance LDO
Typical Characteristics
(Unless otherwise noted, VIN = 5V, TA = 25°C)
Initial Power Up Response Time
CBYP=10nF
VEN (5V/div)
Turn-OFF Response Time
CBYP=10nF
VEN (5V/div)
VOUT (1V/div)
400µs/div
Turn-ON Time From Enable (VIN present)
CBYP=10nF
VEN (5V/div)
VOUT (1V/div)
5 µs/div
VOUT (1V/div)
50 µs/div
Over Current Protection
1200
1000
800
600
400
200
0
-200
Time (20 ms/div)
Line Transient Response
6
5
VIN
4
3
2
1 VOUT
0
100µs/div
3.04
3.03
3.02
3.01
3.00
2.99
2.98
6
Load Transient Response
2.90
2.85
2.80
VOUT
2.75
2.70
2.65
2.60
IOUT
100µs/div
500
400
300
200
100
0
-100
3218.2004.02.1.0

6 Page









AAT3218IJS-3.5-T1 pdf, datenblatt
AAT3218
150mA MicroPower™ High Performance LDO
Applications Information
VOUT = 2.5 volts
IOUT = 150mA
IGND = 150uA
VIN(MAX)=(211mW+(2.5Vx150mA))/(150mA +150uA)
VIN(MAX) = 3.90V
Higher input to output voltage differentials can be
obtained with the AAT3218, while maintaining
device functions within the thermal safe operating
area. To accomplish this, the device thermal
resistance must be reduced by increasing the heat
sink area or by operating the LDO regulator in a
duty cycled mode.
For example, an application requires VIN = 4.2V
while VOUT = 2.5V at a 150mA load and TA = 85°C.
VIN is greater than 3.90V, which is the maximum
safe continuous input level for VOUT = 2.5V at
150mA for TA = 85°C. To maintain this high input
voltage and output current level, the LDO regulator
must be operated in a duty cycled mode. Refer to
the following calculation for duty cycle operation:
PD(MAX) is assumed to be 211mW
IGND = 150µA
IOUT = 150mA
VIN = 4.2 volts
VOUT = 2.5 volt
%DC=100(PD(MAX)/((VIN-VOUT)IOUT+(VINxIGND))
%DC=100(211mW/((4.2V-2.5V)150mA+(4.2Vx150µA))
%DC = 85.54%
For a 150mA output current and a 2.7volt drop
across the AAT3218 at an ambient temperature of
85°C, the maximum on time duty cycle for the
device would be 85.54%.
The following family of curves show the safe oper-
ating area for duty cycled operation from ambient
room temperature to the maximum operating level.
Device Duty Cycle vs. VDROP
VOUT = 2.5V @ 25 C
3.5
3
2.5
2
1.5
1
0.5
0
0
200mA
10 20 30 40 50 60 70 80 90 100
Duty Cycle (%)
Device Duty Cycle vs. VDROP
VOUT= 2.5V @ 50 C
3.5
3
2.5
2
1.5
1
0.5
0
0
200mA
150mA
10 20 30 40 50 60 70 80 90 100
Duty Cycle (%)
Device Duty Cycle vs.
VOUT = 2.5V @ 85 C
VDROP
3.5
3
2.5
2
1.5
1
0.5
0
0
200mA
150mA
100mA
10 20 30 40 50 60 70 80 90 100
Duty Cycle (%)
12 3218.2004.02.1.0

12 Page





SeitenGesamt 18 Seiten
PDF Download[ AAT3218IJS-3.5-T1 Schematic.PDF ]

Link teilen




Besondere Datenblatt

TeilenummerBeschreibungHersteller
AAT3218IJS-3.5-T1150mA MicroPower High Performance LDOETC
ETC

TeilenummerBeschreibungHersteller
CD40175BC

Hex D-Type Flip-Flop / Quad D-Type Flip-Flop.

Fairchild Semiconductor
Fairchild Semiconductor
KTD1146

EPITAXIAL PLANAR NPN TRANSISTOR.

KEC
KEC


www.Datenblatt-PDF.com       |      2020       |      Kontakt     |      Suche