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 am plifiers. 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
1V
CTRL Input pin of the voltage control loop
2 GND Ground
3V
OUT Output pin. Sinking current only
4I
CTRL Input pin of the current control loop
5V
SENSE Input pin of the current control loop
6V
CC Power supply
Pin Configuration
2
1
34
5
6
(SOT-23-6)
K Package
VCTRL
GND
VOUT
VCC
VSENSE
ICTRL
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
VCC
VOUT
GND
VSENSE
ICTRL
Package Temperature
Range
Part Number Marking ID Packing
Type
Tin Lead Lead Free Tin Lead Lead Free
SOT-23-6 -40 to 105oCAP4305KTR 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
45
6
VCTRL
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 VCC 20 V
Input Voltage VIN -0.3 to VCC V
Junction Temperature TJ150 oC
Storage Temperature TSTG -65 to 150 oC
Lead Temperature (Soldering, 5sec) TLEAD 260 oC
Package Thermal Resistance (Junction to Case) θJC 92 oC/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 VCC 2.5 18 V
Operating Temperature Range TA -40 105 oC
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 ICC TA=25oC0.5 1 mA
-40oC
<
TA
<
105oC0.6
VOLTAGE CONTROL LOOP
Transconduction Gain (VCTRL).
Sink Current Only Gmv TA=25oC13.5 mA/mV
-40oC
<
TA
<
105oC2.5
Voltage Control Loop Reference VREF TA=25oC1.204 1.21 1.216 V
-40oC
<
TA
<
105oC1.186 1.234
Input Bias Current (VCTRL)I
IBV TA=25oC50 nA
-40oC
<
TA
<
105oC 100
CURRENT CONTROL LOOP
Transconduction Gain (ICTRL).
Sink Current Only Gmi TA=25oC1.5 7 mA/mV
Current Control Loop Reference VSENSE
IOUT=2.5
mA TA=25oC198 200 202 mV
-40oC
<
TA
<
105oC 192 208
Current Out of Pin ICTRL at
200mV IIBI TA=25oC25
µA
-40oC
<
TA
<
105oC50
OUTPUT STAGE
Low Output Voltage at 10mA
Sinking Current VOL TA=25oC200 mV
Output Short Circuit Current.
Output to VCC. Sink Current Only IOS TA=25oC27 50 mA
-40oC
<
TA
<
105oC35
(VCC=5V, TA=25oC, unless otherwise specified.)
Electrical Characteristics
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305
Preliminary Datasheet
6
Sep. 2005 Rev. 1. 1 BCD Semiconductor Manufacturing Limited
Typical Performance Characteristics
Figure 4. V
REF
vs. Ambient Temperature
Figure 5. VSENSE vs. Ambient Temperature
-40-200 20406080100120
1.200
1.205
1.210
1.215
1.220
1.225
1.230
VREF (V)
Ambient Temperature (oC)
-40 -20 0 20 40 60 80 100 120
197
198
199
200
201
202
203
204
VCC=12V
VCC=5V
VCC=2.5V
VSENSE (V)
Ambient Temperature (oC)
Figure 6. IIBV vs. Ambient Temperature
-40 -20 0 20 40 60 80 100 120
0
20
40
60
80
100
120
VCC=12V
VCC=5V
VCC=2.5V
IIBV (nA)
Ambient Temperature (oC)
-40 -20 0 20 40 60 80 100 120
15
20
25
30
35
40
45
VCC=12V
VCC=5V
VCC=2.5V
IIBI (µA)
Ambient Temperature (oC)
Figure 7. IIBI vs. Ambient Temperature
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305
Preliminary Datasheet
7
Sep. 2005 Rev. 1. 1 BCD Semiconductor Manufacturing Limited
Typical Performance Characteristics (Continued)
Figure 8. Output Short Circuit Current vs. Figure 9. Supply Current vs. Ambient Temperature
-40 -20 0 20 40 60 80 100 120
0
10
20
30
40
50
60
VCC=12V
VCC=5V
VCC=2.5V
Output Short Circuit Current (mA)
Ambient Temperature (oC)
-40 -20 0 20 40 60 80 100 120
0.0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
VCC=12V
VCC=5V
VCC=2.5V
Supply Current (mA)
Ambient Temperature (oC)
Ambient Temperature
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305
Preliminary Datasheet
8
Sep. 2005 Rev. 1. 1 BCD Semiconductor Manufacturing Limited
Typical Application
Figure 10. Typi cal Application of AP4 305
1.210V
200mV
VCC
VOUT
GND
VSENSE
ICTRL
R7
R4
To primary R2
R1
VOUT
GND
Load
C1
2.2nF
R3
470K
C2
22pF
C3
2.2nF
R5
22K
R6
500
VCTRL
AP4305
9
BCD Semiconductor Manufacturing Limited
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER AP4305
Preliminary Datasheet
Sep. 2005 Rev. 1. 1
Mechanical Dimensions
SOT-23-6 Unit: mm(inch)
2.820(0.111)
3.020(0.119)
2.650(0.104)
2.950(0.116)
1.500(0.059)
1.700(0.067)
0.950(0.037)TYP
1.800(0.071)
2.000(0.079)
0.300(0.012)
0.400(0.016)
0.700(0.028)REF
0.100(0.004)
0.200(0.008)
0°
8°
0.200(0.008)
0.300(0.012)
0.600(0.024)
0.000(0.000)
0.100(0.004)
1.050(0.041)
1.150(0.045) 1.050(0.041)
1.250(0.049)
IMPOR TANT NOTICE
BCD Semiconductor Manufacturing Limited reserves the right to make changes without further notice to any products or specifi-
cations herein. BCD Semiconductor Manufacturing Limited does not assume any responsibility fo r use of any its products for any
particular purpose, nor does BCD Semiconductor Man ufacturing Limited assume any liability arising out of the application or use
of any its products or circuits. BCD Semiconductor Manufacturing Limited does not convey any license under its patent rights or
other rights nor the rights of others.
- Wafer Fab
Shanghai SIM-BCD Semiconductor Manufacturing Limited
800, Yi Shan Road, Shanghai 200233, China
Tel: +86-21-6485 1491, Fax: +86-21-5450 0008
BCD Semiconductor Manufacturing Limited
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