ETC AQT104

AQT104
Quik LDO
2.5V or Adjustable, No Output Cap, Low Dropout Regulator
Preliminary Design Specification
General Description
The Quik LDO™ AQT104 is a low
dropout regulator that requires no
external output capacitor for stability and
it is stable with any capacitive load. It
offers 0.5 Ohms pass device with 500mA
load current. Its output voltage is preset
to values between 2V and 3.3V with 1%
accuracy and presents very good line
and load regulation. It also includes
output current limit with foldback
characteristic and thermal shutdown. The
removal of the output capacitor allows
cost and board space reduction along
with energy saving at power on and off.
It is best suited for battery-powered
equipments and in particular for cellular
phones.
Block Diagram
Revision 0.5, May 2, 2003
Applications
•
•
•
Cordless and cellular phones
Medical equipment
PDAs and battery-powered equipments
Features
•
•
•
•
•
•
•
•
•
•
•
No need for output capacitor
500mA output current
150mV drop at 300mA
Preset output voltages (1% accuracy)
Low current consumption
Foldback output current limitation
Thermal Shutdown
Excellent load and line regulation
Low noise
Fast turn on and off
SOT23 package
Pin Configuration
Quik LDO™ technology is patent pending.
Quik LDO™ is a trademark of Acutechnology Semiconductor Inc.
Quik LDO™ is not a typo – with a Quik LDO™ you eliminate a “C”.
Acutechnology Semiconductor Inc.
www.acutechnology.com
Acutechnology Semiconductor Inc.
AQT104 Quik LDO™
Pin Description
Pin
Pin Name
Function
1
2
3
4
5
VIN
GND
ENABLE
ADJ/CBY
VOUT
Regulator Input.
Ground
Enable
Output voltage adjust
Regulator output
Absolute Maximum Ratings
VIN Voltage ................................................ 7V
VIN Current............................................... 1A
Operating Junction Temperature ............... 150ºC
Lead Temperature (soldering 10 seconds). 260ºC
Storage Temperature Range ...................... -65ºC to +150ºC
Electrical Specifications
Electrical characteristics are guaranteed by design over the full temperature range –40ºC <Tj<135ºC. Ambient
temperature must be de-rated based upon power dissipation and package thermal characteristics.
Unless otherwise stated, test conditions are Vin=Vout+0.5V, Iout=1mA, Tj=+25ºC.
Symbol
Parameter
VIN
Input Voltage
Icc
Ground Current
ILIM
Current Limit
Vout
Output Voltage Accuracy
Conditions
Min
Typ
Max
Units
6
V
0.1
0.2
mA
700
850
mA
2
550
Ta=25ºC
1.5
1
DVcc
DViload
Tshut
DO
Line regulation
VIN=(Vout+0.1V) to 6V
Iout=20mA
Load Regulation
Iout=1 mA to 500mA
%
2.5
Over Temperature
Thermal Shut-down Temperature
Thermal Shut down Hysteresis
1.5
3
mV
5
10
mV
160
20
ºC
Dropout Voltage
Iout=300mA
150
Reference Power Supply Rejection
Freq.=120Hz
60
dB
En
Output Voltage Noise
f=10Hz to 100KHz (no caps)
Vout=2.5V
150
uVrms
Venl
EN Input Low Voltage
Venh
EN Input High Voltage
Vin=5V
Shutdown Current
EN=0V
PSRR
Isd
Acutechnology Semiconductor Inc.
Preliminary Design Specification
180
0.8
AQT104 Rev 05, May 2, 2003
2
mV
V
V
10
300
nA
www.acutechnology.com
Page 2 of 4
Acutechnology Semiconductor Inc.
AQT104 Quik LDO™
Typical Response
2.62
OUT / V
2.58
2.54
2.5
2.46
Output current / mA
2.42
450
350
250
150
50
0
100
200
300
400
Time/µSecs
500
600
100µSecs/div
Enable signal / V
Load transient (current step=500mA). No output capacitor!!
4.5
3.5
2.5
1.5
0.5
2.5
OUT / V
2
1.5
1
0.5
00
100
200
300
400
Time/µSec s
500
600
100µSec s /div
Turn on and off transient response.
Acutechnology Semiconductor Inc.
Preliminary Design Specification
AQT104 Rev 05, May 2, 2003
www.acutechnology.com
Page 3 of 4
Acutechnology Semiconductor Inc.
AQT104 Quik LDO™
Package Mechanical Details
SOT23-5
DIM
Millimetres
Inches
MIN
MAX
MIN
MAX
A
0.90
1.45
0.035
0.057
A1
0.00
0.15
0.00
0.006
A2
0.90
1.3
0.035
0.051
b
0.35
0.50
0.014
0.020
C
0.09
0.20
0.0035
0.008
D
2.80
3.00
0.110
0.118
E
2.60
3.00
0.102
0.118
E1
1.50
1.75
0.059
0.069
e
0.95 REF
e1
1.90 REF
0.037 REF
0.075 REF
L
0.10
0.60
0.004
0.024
a°
0
10
0
10
Contact information
Acutechnology Semiconductor Inc.
3487 McKee Rd. Suite 52
San Jose CA 95127
USA
TEL:(408) 259-2300
(408) 259-3400
FAX:(408) 259-9160
e-mail:info@acutechnology.com
Acutechnology Semiconductor Inc.
Preliminary Design Specification
AQT104 Rev 05, May 2, 2003
www.acutechnology.com
Page 4 of 4