AP4312

A Product Line of
Diodes Incorporated
AP4312
CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER
Description
Pin Assignments
The AP4312 is a highly integrated solution for a constant
voltage/constant current mode SMPS application.
(Top View)
Pin 1 Mark
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.
VCTRL
1
6
GND
2
5
VSENSE
VOUT
3
4
ICTRL
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.
VCC
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: 180A
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
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January 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AP4312
Typical Applications Circuit
VOUT+
To
primary
R2
AP4312
VCC
R4
1.210V
C1
R3
VOUT
IL
+
+
VCTRL
Load
C3
GND
R5
ICTRL
VSENSE
R1
R6
500
VOUTR SS
VOUT  VREF 
R1  R 2
R1
CurrentLimit 
VSENSE
RSS
Typical Application 1
VOUT+
To
primary
AP4312
VCC
R4
1.210V
R3
VOUT
+
R2
IL
C1
+
VCTRL
Load
C3
GND
I CTRL
R5
VSENSE
R1
R6
500
VOUTR SS
VOUT  [VREF  ( I L  RSS )] 
R1  R 2
 ( I L  RSS )
R1
CurrentLimit 
VSENSE
RSS
Typical Application 2
AP4312
Document number: DS36797 Rev. 1 - 2
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© Diodes Incorporated
A Product Line of
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AP4312
Typical Applications Circuit (Cont.)
VOUT+
To
primary
AP4312
VCC
R4
1.210V
R3
VOUT
R2
IL
C1
+
+
VCTRL
Load
C3
GND
ICTRL
R5
VSENSE
R1
R6
500
VOUTRSS
VOUT  VREF 
R1  R 2
 ( I L  RSS )
R1
CurrentLimit 
VSENSE  VREF
VSENSE  VREF  RSS
Typical Application 3
Pin Descriptions
Pin Number
Pin Name
1
VCTRL
Input pin of the voltage control loop
2
GND
Ground
3
VOUT
Output pin. Sinking current only
4
ICTRL
Input pin of the current control loop
5
VSENSE
Input pin of the current control loop
6
VCC
AP4312
Document number: DS36797 Rev. 1 - 2
Function
Power Supply
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A Product Line of
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AP4312
Functional Block Diagram
V CC
6
1.210V
3
1
2
4
VOUT
V CTRL
GND
5
I CTRL
VSENSE
Absolute Maximum Ratings (Note 4)
Parameter
Symbol
VCC
Power Supply Voltage
VIN
Input Voltage
Rating
Unit
20
V
-0.3 to VCC
V
TJ
Junction Temperature
+150
C
TSTG
Storage Temperature
-65 to +150
C
TLEAD
Lead Temperature (Soldering, 5sec)
+260
C
Thermal Resistance (Junction to Ambient)
250
C/W
θJA
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
VCC
Parameter
Power Supply Voltage
AP4312
Document number: DS36797 Rev. 1 - 2
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Min
Max
Unit
1.7
18
V
January 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AP4312
Electrical Characteristics (@VCC=5V, TA=+25C, unless otherwise specified.)
Symbol
Parameters
Conditions
Min
Typ
Max
TA=+25C
–
180
–
-40C <TA<+105C
–
–
300
TA=+25C
1
3.5
–
-40C <TA<+105C
–
2.5
–
Unit
TOTAL CURRENT CONSUMPTION
Total Supply Current Not Including the
Output Sinking Current
ICC
μA
VOLTAGE CONTROL LOOP
Gmv
VREF
IIBV
Transconductance of Voltage Control
Loop Op-Amp
(Sink Current Only)
TA=+25C
1.204
-40C <TA<+105C
1.186
Voltage Control Loop Reference
mA/mV
1.216
1.21
V
1.234
TA=+25C
–
50
–
-40C <TA<+105C
–
100
–
TA=+25C
1.5
7
–
-40C <TA<+105C
1.5
7
–
TA=+25C
67.9
Input Bias Current (VCTRL)
nA
CURRENT CONTROL LOOP
Gmi
VSENSE
IIBI
Transconductance of Current Control
Loop Op-Amp
(Sink Current Only)
mA/mV
72.1
70
Current Control Loop Reference
mV
-40C <TA<+105C
66
TA=+25C
–
18
–
-40C <TA<+105C
–
35
–
TA=+25C, ISINK=2mA
–
100
–
-40C <TA<+105C, ISINK=2mA
–
100
–
TA=+25C
–
27
50
-40C <TA<+105C
–
35
–
Current Out of Pin ICTRL at VSENSE
74
μA
OUTPUT STAGE
VOL
Low Output Voltage Level
Output Short Circuit Current.
Output to VCC. Sink Current Only
IOS
mV
mA
Thermal Impedance
Symbol
θJC
Parameter
Thermal Resistance (Junction to Case)
AP4312
Document number: DS36797 Rev. 1 - 2
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Value
Unit
84
C/W
January 2014
© Diodes Incorporated
A Product Line of
Diodes Incorporated
AP4312
Performance Characteristics
Voltage Control Loop Reference
vs. Ambient Temperature
Current Control Loop Reference
vs. Ambient Temperature
74
1.230
1.225
73
VCC=1.7V
VCC=5V
VCC=18V
1.220
72
VSENSE (mV)
VREF (V)
1.215
1.210
1.205
71
70
69
1.200
68
1.195
67
1.190
-20
0
20
40
60
80
100
VCC=1.7V
VCC=5V
VCC=18V
66
-40
120
-20
0
o
Ambient Temperature ( C )
40
60
80
100
120
140
o
Ambient Temperature ( C)
Input Bias Current (VCTRL)
vs. Ambient Temperature
Current Out of Pin ICTRL at VSENSE
vs. Ambient Temperature
24
50
VCC=1.7V
VCC=5V
VCC=18V
22
VCC=1.7V
VCC=5V
VCC=18V
40
20
18
30
IIBI (A)
IIBV (nA)
20
20
16
14
12
10
10
0
-20
0
20
40
60
80
100
-20
120
0
40
60
80
100
120
Ambient Temperature ( C )
Ambient Temperature ( C )
Transconductance of Voltage Control Loop
Op-Amp vs. Ambient Temperature
Transconductance of Current Control Loop
Op-Amp vs. Ambient Temperature
8
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
-20
VCC=1.7V
VCC=5V
VCC=18V
7
Gmi (mA/mV)
6
Gmv (mA/mV)
20
o
o
5
4
3
2
1
0
-20
0
20
40
60
80
100
120
Document number: DS36797 Rev. 1 - 2
0
20
40
60
80
100
120
o
o
Ambient Temperature ( C )
Ambient Temperature ( C )
AP4312
VCC=1.7V
VCC=5V
VCC=18V
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AP4312
Performance Characteristics (Cont.)
Low Output Level of Voltage Control Loop
Op-Amp vs. Ambient Temperature
Low Output Level of Current Control Loop
Op-Amp vs. Ambient Temperature
50
50
VCC=1.7V
VCC=5V
VCC=18V
VCC=1.7V
VCC=5V
VCC=18V
40
30
30
VOLC (mV)
VOLV (mV)
40
20
20
10
10
0
-20
0
20
40
60
80
100
0
-20
120
0
20
80
100
120
Ambient Temperature ( C )
Output Short Circuit Current of Voltage Control
Loop Op-Amp vs. Ambient Temperature
Output Short Circuit Current of Current Control
Loop Op-Amp vs. Ambient Temperature
70
70
60
60
50
50
IOSC (mA)
IOSV (mA)
60
Ambient Temperature ( C )
40
30
VCC=1.7V
VCC=5V
VCC=18V
20
10
0
-20
0
20
40
60
80
100
40
30
VCC=1.7V
VCC=5V
VCC=18V
20
10
0
-20
120
0
20
40
60
80
100
120
o
o
Ambient Temperature ( C )
Ambient Temperature ( C )
Total Supply Current Not Including the
Output Sinking Current vs. Ambient Temperature
Low Output Voltage Level vs. Sink Current
800
300
VCC=1.7V
VCC=5V
VCC=18V
250
700
600
200
500
VOL (mV)
ICC (A)
40
o
o
150
400
300
100
200
50
0
-20
100
0
0
20
40
60
80
100
0
120
o
Document number: DS36797 Rev. 1 - 2
10
15
20
25
30
35
Sink Current (mA)
Ambient Temperature ( C )
AP4312
5
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AP4312
Ordering Information
AP4312 XX XX - G1
Product Name
Package
K6 : SOT26
Packing
RoHS/Green
TR : Tape & Reel
G1 : Green
Diodes IC’s Pb-free products with "G1" suffix in the part number, are RoHS compliant and green.
Package
Part Number
Marking ID
Packing
SOT26
AP4312K6TR-G1
GKD
3000/Tape & Reel
Marking Information
: Logo
XXX: Marking ID (See ordering information)
AP4312
Document number: DS36797 Rev. 1 - 2
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AP4312
Package Outline Dimensions (All dimensions in mm(inch).)
(1)
Package Type: SOT26
0°
2.820(0.111)
8°
3.100(0.122)
0.300(0.012)
0.500(0.020)
5
4
2
3
0.300(0.012)
0.600(0.024)
1.500(0.059)
1.700(0.067)
2.650(0.104)
3.000(0.118)
6
0.200(0.008)
Pin 1 Mark
1
0.700(0.028)REF
0.950(0.037)TYP
0.000(0.000)
0.150(0.006)
1.800(0.071)
2.000(0.079)
0.100(0.004)
0.200(0.008)
0.900(0.035) 1.450(0.057)
MAX
1.300(0.051)
AP4312
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AP4312
Suggested Pad Layout
(1)
Package Type: SOT26
E
E
Y
G
Z
X
Dimensions
Z
(mm)/(inch)
G
(mm)/(inch)
X
(mm)/(inch)
Y
(mm)/(inch)
E
(mm)/(inch)
Value
3.600/0.142
1.600/0.063
0.700/0.028
1.000/0.039
0.950/0.037
AP4312
Document number: DS36797 Rev. 1 - 2
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AP4312
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
(AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION).
Diodes Incorporated and its subsidiaries reserve the right to make modifications, enhancements, improvements, corrections or other changes
without further notice to this document and any product described herein. Diodes Incorporated does not assume any liability arising out of the
application or use of this document or any product described herein; neither does Diodes Incorporated convey any license under its patent or
trademark rights, nor the rights of others. Any Customer or user of this document or products described herein in such applications shall assume
all risks of such use and will agree to hold Diodes Incorporated and all the companies whose products are represented on Diodes Incorporated
website, harmless against all damages.
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indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
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This document is written in English but may be translated into multiple languages for reference. Only the English version of this document is the
final and determinative format released by Diodes Incorporated.
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Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
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1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
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failure of the life support device or to affect its safety or effectiveness.
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representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
Copyright © 2013, Diodes Incorporated
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AP4312
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