CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305
Preliminary Datasheet
1
Sep. 2005 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
General Description
The AP4305 is a highly integrated solution for a con-
stant voltage/constant current mode SMPS application.
The AP4305 contains one 1.21V voltage reference
with
0.5% accuracy, one current sensing circuit and
two operational amplifiers. Combining the voltage ref-
erence with one operational amplifier makes AP4305
an ideal voltage controller for use in adapters and bat-
tery chargers. The other low voltage reference com-
bined with the other operational amplifier makes it an
ideal current limiter for output low side current sens-
ing.
The AP4305 is available in SOT-23-6 package.
Features
Constant Voltage and Constant Current Control
Precision Internal Voltage Reference
Few External Components
Easy Compensation
Applications
Adapters
Battery Chargers
Figure 1. Package Type of AP4305
SOT-23-6
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305
Preliminary Datasheet
2
Sep. 2005 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
Figure 2. Pin Configuration of AP4305 (Top View)
Pin Description
Pin Number
Pin Name
Function
1
V
CTRL
Input pin of the voltage control loop
2
GND
Ground
3
V
OUT
Output pin. Sinking current only
4
I
CTRL
Input pin of the current control loop
5
V
SENSE
Input pin of the current control loop
6
V
CC
Power
supply
Pin Configuration
2
1
3
4
5
6
(SOT-23-6)
K Package
V
CTRL
GND
V
OUT
V
CC
V
SENSE
I
CTRL
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305
Preliminary Datasheet
3
Sep. 2005 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
Functional Block Diagram
Figure 3. Functional Block Diagram of AP4305
V
CC
V
OUT
GND
V
SENSE
I
CTRL
Package
Temperature
Range
Part Number
Marking ID
Packing
Type
Tin Lead
Lead Free
Tin Lead
Lead Free
SOT-23-6
-40 to 105
o
C
AP4305KTR
AP4305KTR-E1
K2B
E2B
Tape & Reel
Circuit Type
Package
K: SOT-23-6
E1: Lead Free
Blank: Tin Lead
AP4305 -
TR: Tape and Reel
Blank: Tube
Ordering Information
1.210V
200mV
1
2
3
4
5
6
V
CTRL
BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant.
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305
Preliminary Datasheet
4
Sep. 2005 Rev. 1. 1
BCD Semiconductor Manufacturing Limited
Parameter Symbol
Value
Unit
Power Supply Voltage
V
CC
20
V
Input Voltage
V
IN
-0.3 to V
CC
V
Junction Temperature
T
J
150
o
C
Storage Temperature
T
STG
-65 to 150
o
C
Lead Temperature (Soldering, 5sec)
T
LEAD
260
o
C
Package Thermal Resistance (Junction to Case)
JC
92
o
C/W
Note 1: Stresses greater than those listed under "Absolute Maximum Ratings" may cause permanent damage to the device.
These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated
under "Recommended Operating Conditions" is not implied. Exposure to "Absolute Maximum Ratings" for extended periods
may affect device reliability.
Parameter
Symbol
Min
Max
Unit
Power Supply Voltage
V
CC
2.5
18
V
Operating Temperature Range
T
A
-40
105
o
C
Recommended Operating Conditions
Absolute Maximum Ratings (Note 1)
5
BCD Semiconductor Manufacturing Limited
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305
Preliminary Datasheet
Sep. 2005 Rev. 1. 1
Parameter
Symbol
Conditions
Min
Typ
Max
Unit
TOTAL CURRENT CONSUMPTION
Total Supply Current
Not Including the Output Sinking
Current
I
CC
T
A
=25
o
C
0.5
1
mA
-40
o
C
<T
A
<105
o
C
0.6
VOLTAGE CONTROL LOOP
Transconduction Gain (V
CTRL
).
Sink Current Only
Gmv
T
A
=25
o
C
1
3.5
mA/mV
-40
o
C
<T
A
< 105
o
C
2.5
Voltage Control Loop Reference
V
REF
T
A
=25
o
C
1.204
1.21
1.216
V
-40
o
C
<T
A
< 105
o
C
1.186
1.234
Input Bias Current (V
CTRL
)
I
IBV
T
A
=25
o
C
50
nA
-40
o
C
<T
A
< 105
o
C
100
CURRENT CONTROL LOOP
Transconduction Gain (I
CTRL
).
Sink Current Only
Gmi
T
A
=25
o
C
1.5
7
mA/mV
Current Control Loop Reference
V
SENSE
I
OUT
=2.5
mA
T
A
=25
o
C
198
200
202
mV
-40
o
C
<T
A
< 105
o
C
192
208
Current Out of Pin I
CTRL
at
200mV
I
IBI
T
A
=25
o
C
25
A
-40
o
C
<T
A
< 105
o
C
50
OUTPUT STAGE
Low Output Voltage at 10mA
Sinking Current
V
OL
T
A
=25
o
C
200
mV
Output Short Circuit Current.
Output to V
CC.
Sink Current Only
I
OS
T
A
=25
o
C
27
50
mA
-40
o
C
<T
A
< 105
o
C
35
(V
CC
=5V, T
A
=25
o
C, unless otherwise specified.)
Electrical Characteristics
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