A Product Line of
Diodes Incorporated
AP4312
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER
Description
The AP4312 is a highly integrated solution for a constant
voltage/constant current mode SMPS application.
The AP4312 contains one 1.21V voltage reference, one low voltage
reference used in current sensing circuit and two operational
amplifiers. The 1.21V voltage reference, combined with one
operational amplifier, makes of an ideal voltage controller for use in
adapters and battery chargers. The low voltage reference, combined
with another operational amplifier, makes of an ideal current limiter for
output low side current sensing.
The AP4312 is fully compatible with AP4306 in functionality and
electrical characteristics except its lower reference voltage for current
control loop, thus higher power efficiency in SMPS applications such
as low power charger can be realized with AP4312 compared to
AP4306.
The AP4312 is available in SOT26 package.
Pin Assignments
(Top View)
Pin 1 Mark
V
CTRL
GND
V
OUT
1
2
3
6
5
4
V
CC
V
SENSE
I
CTRL
SOT26 (K6 Package)
Applications
Adapters
Battery Chargers
Features
Constant Voltage and Constant Current Control
Precision Internal Voltage Reference
Low External Component Count
Easy Compensation
Low Supply Current: 180A
Current Control Loop Reference: 70mV
Operating Supply Voltage: 1.7V to 18V
Totally Lead-free & Fully RoHS Compliant (Note 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes:
1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
AP4312
Document number: DS36797 Rev. 1 - 2
1 of 11
www.diodes.com
January 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AP4312
Typical Applications Circuit
(Cont.)
V
OUT
+
To
primary
AP4312
V
CC
1.210V
V
OUT
R4
R3
R2
I
L
C1
+
+
V
CTRL
Load
C3
GND
I
CTRL
V
SENSE
R5
R1
R6
500
R
SS
V
OUT
-
V
OUT
½
V
REF
R
1
R
2
(
I
L
R
SS
)
R
1
Typical Application 3
CurrentLimit
½
V
SENSE
V
REF
V
SENSE
V
REF
R
SS
Pin Descriptions
Pin Number
1
2
3
4
5
6
Pin Name
V
CTRL
GND
V
OUT
I
CTRL
V
SENSE
V
CC
Input pin of the voltage control loop
Ground
Output pin. Sinking current only
Input pin of the current control loop
Input pin of the current control loop
Power Supply
Function
AP4312
Document number: DS36797 Rev. 1 - 2
3 of 11
www.diodes.com
January 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AP4312
Functional Block Diagram
V
CC
6
1.210V
3
V
OUT
1
V
CTRL
2
GND
4
5
I
CTRL
V
SENSE
Absolute Maximum Ratings
(Note 4)
Symbol
V
CC
V
IN
T
J
T
STG
T
LEAD
θ
JA
Parameter
Power Supply Voltage
Input Voltage
Junction Temperature
Storage Temperature
Lead Temperature (Soldering, 5sec)
Thermal Resistance (Junction to Ambient)
Rating
20
-0.3 to V
CC
+150
-65 to +150
+260
250
Unit
V
V
C
C
C
C/W
Note 4: 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.
Recommended Operating Conditions
Symbol
V
CC
Parameter
Power Supply Voltage
Min
1.7
Max
18
Unit
V
AP4312
Document number: DS36797 Rev. 1 - 2
4 of 11
www.diodes.com
January 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AP4312
Electrical Characteristics
(@V
CC
=5V, T
A
=+25
C
, unless otherwise specified.)
Symbol
Parameters
Conditions
Min
Typ
Max
Unit
TOTAL CURRENT CONSUMPTION
I
CC
Total Supply Current Not Including the
Output Sinking Current
T
A
=+25C
-40C <T
A
<+105C
–
–
180
–
–
300
μA
VOLTAGE CONTROL LOOP
Gmv
Transconductance of Voltage Control
Loop Op-Amp
(Sink Current Only)
Voltage Control Loop Reference
-40C <T
A
<+105C
T
A
=+25C
I
IBV
Input Bias Current (V
CTRL
)
-40C <T
A
<+105C
CURRENT CONTROL LOOP
Gmi
Transconductance of Current Control
Loop Op-Amp
(Sink Current Only)
Current Control Loop Reference
-40C <T
A
<+105C
T
A
=+25C
I
IBI
OUTPUT STAGE
T
A
=+25C, I
SINK
=2mA
V
OL
Low Output Voltage Level
-40C <T
A
<+105C, I
SINK
=2mA
I
OS
Output Short Circuit Current.
Output to V
CC.
Sink Current Only
T
A
=+25C
-40C <T
A
<+105C
–
–
–
–
100
100
27
35
–
–
50
–
mA
mV
Current Out of Pin I
CTRL
at V
SENSE
-40C <T
A
<+105C
T
A
=+25C
-40C <T
A
<+105C
T
A
=+25C
V
SENSE
1.5
1.5
67.9
70
66
–
–
18
35
74
–
–
μA
7
7
–
–
72.1
mV
mA/mV
T
A
=+25C
-40C <T
A
<+105C
T
A
=+25C
1
–
1.204
1.21
1.186
–
–
50
100
1.234
–
–
nA
3.5
2.5
–
–
1.216
V
mA/mV
V
REF
Thermal Impedance
Symbol
θ
JC
Parameter
Thermal Resistance (Junction to Case)
Value
84
Unit
C/W
AP4312
Document number: DS36797 Rev. 1 - 2
5 of 11
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January 2014
© Diodes Incorporated
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