AQ105
Secondary V/I amplifier
SOT23-5 and SC70-5 Package
Product Specification
Revision 1.3
July 17, 2006
General Description
The AQ105 is a low cost secondary
control circuit for low power applications
needing constant voltage and constant
current control. It implements a simple
single-loop control by modifying the
internal reference level as a function of
current above the current limit threshold.
The current loop reduces the reference
by 40 mV per mV change at the current
sense input. The error amp provides
high gain and bandwidth under low
voltage operation.
Applications
•
Offline Battery Chargers
•
Constant V/ Constant I supplies
Features
•
1.25V reference
•
200mV current limit threshold
•
Error amp output swings near ground for
•
•
•
•
•
•
•
•
low voltage operation
High PSRR and line regulation
Low current consumption
Offered in ultra small SC70-5 package
Open collector output
Low voltage operation 2.2V
10mA current sink
50 ppm/ºC typical temperature deviation
RoHS compliant
available
Block Diagram
Pin Configuration
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AQ105
Acutechnology Semiconductor Inc.
AQ105
Typical Application
Pin Descriptions
Pin
1
2
3
4
5
Pin Name
VCC
GND
COMP
FB
CS
Function
Positive supply
Ground
Output of error amplifier; 10 mA source/sink capability
Inverting input to error amplifier; will have threshold of 1.25V.
Current sense input
Ordering Information
Device
AQ105
AQ105
AQ105
AQ105
Note:
The
Operating Tj
-20C˚
≤
105C˚
-20C˚
≤
105C˚
-20C˚
≤
105C˚
-20C˚
≤
105C˚
%Tol
1.0
1.0
1.0
1.0
Pkg Type
SOT-23-5
SOT-23-5
SC70-5
SC70-5
V
OUT
1.25V
1.25V
1.25V
1.25V
Wrap
T&R
T&R
T&R
T&R
Ordering Number
AQ105DY-M5-12-TR
AQ105DY-M5-12-TRL
AQ105DY-C5-12-TR
AQ105DY-C5-12-TRL
TRL parts are Lead Free and RoHS compliant.
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Rev. 1.3
July 17, 2006
Acutechnology Semiconductor Inc.
AQ105
Absolute Maximum Ratings
Parameter
V
CC
Voltage
COMP Voltage
REF Voltage
CS Voltage (Self limiting diodes)
VCC, COMP, REF, CS Current
Operating Junction Temperature
Lead Temperature (soldering 10 seconds)
Storage Temperature Range
ESD Rating (HBM)
Value
20
20
20
±1
50
150
260
-65 to +150
2
Units
V
V
V
V
mA
ºC
ºC
ºC
KV
Electrical Specifications
Electrical characteristics are guaranteed over the full temperature range –20ºC <Tj<105ºC. Ambient
temperature must be de-rated based upon power dissipation and package thermal characteristics. Unless
otherwise stated, test conditions are VCC = 3V, VCOMP = VFB, ICOMP = 1mA.
Symbol
Vcc
Icc
Vref
DVcc
DViload
Tcref
IFB
PSRR
Av
BW
VCOMP
Parameter
Supply Voltage
Quiescent Supply Current
Reference Voltage
Line regulation
Load Regulation
Reference Temperature Deviation
REF input current
Power Supply Rejection
Error Amplifier Open Loop Gain
Unity Gain Frequency
Output Saturation Voltage
Freq.=300KHz
ICOMP=2mA,
COMP=1V
ICOMP=2mA,
COMP=1V
ICOMP=10mA,
VFB=HIGH
ICOMP=1mA to 20mA
VCOMP=16 VFB=0
Tj=25ºC
-20<Tj<105ºC
-20<Tj<105ºC
Vcs=-200 mV
Vcs=-250 mV
Conditions
VCOMP=1V VCC=15V
Ta=25ºC
VCC=2.5V to VCC=18V
ICOMP=1mA to 5mA
-20ºC <Tj<105ºC
Min
2.2
Typ
0.2
Max
18
0.5
1.263
1
2
1
500
Units
V
mA
V
mV
mV
%
nA
dB
dB
MHz
1.238
1.250
0.2
1
0.5
-500
40
80
2.5
200
2.5
200
197
195
36
40
150
220
250
mV
mA/mV
TRANSC Output Transconductance
Ileak
Vcs
Gain
Ics
Output Leakage Current
Current sense threshold voltage
Current sense gain to reference
Bias current
400
203
205
44
nA
mV
mV/mV
µA
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3
Rev. 1.3
July 17, 2006
Acutechnology Semiconductor Inc.
AQ105
Package Dimensions
SOT23-3, SOT23-4, SOT23-5, SOT23-6
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4
Rev. 1.3
July 17, 2006
Acutechnology Semiconductor Inc.
AQ105
Package Dimensions (contd.)
SC70-3, SC70-4, SC70-5, SC70-6
Contact Information
Acutechnology Semiconductor Inc.
3487 McKee Rd. Suite 52
San Jose CA , USA 95127
Disclaimer
The information furnished by Acutechnology in this data sheet is believed to be accurate and reliable. However,
Acutechnology assumes no responsibility for its use. Acutechnology reserves the right to change circuitry and specifications
at any time without notification to the customer.
TEL:
FAX:
website:
(408) 259-2300
(408) 259-9160
www.acutechnology.com
Life Support Policy
Acutechnology Products are not designed or authorized for use as components in life support devices or systems where
malfunction of a product can reasonably be expected to result in personal injury. Life support devices or systems are
devices or systems that (a) are intended for surgical implant into the body or (b) support or sustain life, and whose failure to
perform can be reasonably expected to result in a significant injury to the user.
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Rev. 1.3
July 17, 2006
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