Diodes AP4312 User Manual

AP4312

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AP4312

A Product Line of

Diodes Incorporated

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.

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)

Pin Assignments

(Top View)

1

2

3 4

5

Pin 1 Mark

6

V

SENSE

GND

V

CTRL

I

CTRL

V

OUT

V

CC

SOT26 (K6 Package)

Applications

 Adapters
 Battery Chargers

CONSTANT VOLTAGE AND CONSTANT CURRENT CONTROLLER

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

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AP4312

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1.210V

V

CC

V

OUT

GND

V

SENSE

I

CTRL

R

SS

R4

To

primary

R2

R1

V

OUT

+

V

OUT

-

Load

C1

R3

C3

R5

R6
500

V

CTRL

AP4312

+

+

I

L

)(

1

21

)]([

SSLSSLREF

UT

O

RI

R

RR

RIVV 





SS

SENSE

R

V

itCurrentLim 

1.210V

V

CC

V

OUT

GND

V

SENSE

I

CTRL

R

SS

R4

To

primary

R2

R1

V

OUT

+

V

OUT

-

Load

C1

R3

C3

R5

R6

500

V

CTRL

AP4312

+

+

I

L

121R

RR

VV

REFOUT





SS

SENSE

R

V

itCurrentLim 

Typical Applications Circuit

Typical Application 1

Typical Application 2

AP4312

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AP4312

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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

VCC

Power Supply

)(

1

21

SSLREFOUT

RI

R

RR

VV 





 

SSREFSENSE

REFSENSE

RVV

VV

itCurrentLim







1.210V

V

CC

V

OUT

GND

V

SENSE

I

CTRL

R

SS

R4

To

primary

R2

R1

V

OUT

+

V

OUT

-

Load

C1

R3

C3

R5

R6

500

V

CTRL

AP4312

+

+

I

L

Typical Applications Circuit (Cont.)

Typical Application 3

Pin Descriptions

AP4312

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V

CC

V

OUT

V

CTRL

GND

V

SENSE

I

CTRL

4

5

2

1

3

6

1.210V

Symbol

Parameter

Rating

Unit

VCC

Power Supply Voltage

20

V

VIN

Input Voltage

-0.3 to VCC

V

TJ

Junction Temperature

+150

C

T

STG

Storage Temperature

-65 to +150

C

T

LEAD

Lead Temperature (Soldering, 5sec)

+260

C

θ

JA

Thermal Resistance (Junction to Ambient)

250

C/W

Symbol

Parameter

Min

Max

Unit

VCC

Power Supply Voltage

1.7

18

V

Functional Block Diagram

Absolute Maximum Ratings (Note 4)

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

AP4312

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Symbol

Parameters

Conditions

Min

Typ

Max

Unit

TOTAL CURRENT CONSUMPTION

I

CC

Total Supply Current Not Including the
Output Sinking Current

TA=+25C

–

180

–

μA

-40C <TA<+105C

– – 300

VOLTAGE CONTROL LOOP

Gmv

Transconductance of Voltage Control
Loop Op-Amp
(Sink Current Only)

TA=+25C

1

3.5

–

mA/mV

-40C <TA<+105C

–

2.5

–

V

REF

Voltage Control Loop Reference
TA=+25C

1.204

1.21

1.216

V

-40C <TA<+105C

1.186

1.234

I

IBV

Input Bias Current (V

CTRL

)

TA=+25C

–

50

–

nA

-40C <TA<+105C

–

100

–

CURRENT CONTROL LOOP

Gmi

Transconductance of Current Control
Loop Op-Amp
(Sink Current Only)

TA=+25C

1.5 7 –

mA/mV

-40C <TA<+105C

1.5 7 –

V

SENSE

Current Control Loop Reference
TA=+25C

67.9

70

72.1

mV

-40C <TA<+105C

66

74

I

IBI

Current Out of Pin I

CTRL

at V

SENSE

TA=+25C

–

18

–

μA

-40C <TA<+105C

–

35

–

OUTPUT STAGE

V

OL

Low Output Voltage Level
TA=+25C, I

SINK

=2mA

–

100

–

mV

-40C <TA<+105C, I

SINK

=2mA

–

100

–

I

OS

Output Short Circuit Current.
Output to V

CC.

Sink Current Only

TA=+25C

–

27

50

mA

-40C <TA<+105C

–

35

–

Symbol

Parameter

Value

Unit

θ

JC

Thermal Resistance (Junction to Case)

84

C/W

Electrical Characteristics (@V

=5V, TA=+25C, unless otherwise specified.)

CC

Thermal Impedance

AP4312

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-20 0 20 40 60 80 100 120

1.190

1.195

1.200

1.205

1.210

1.215

1.220

1.225

1.230

VCC=1.7V
VCC=5V
VCC=18V

V

REF

(V)

Ambient Temperature ( oC )

-40 -20 0 20 40 60 80 100 120 140

66

67

68

69

70

71

72

73

74

V

SENSE

(mV)

Ambient Temperature (oC)

VCC=1.7V
VCC=5V
VCC=18V

-20 0 20 40 60 80 100 120

0

10

20

30

40

50

Ambient Temperature ( oC )

I

IBV

(nA)

VCC=1.7V
VCC=5V
VCC=18V

-20 0 20 40 60 80 100 120

10

12

14

16

18

20

22

24

Ambient Temperature ( oC )

I

IBI

(A)

VCC=1.7V
VCC=5V
VCC=18V

-20 0 20 40 60 80 100 120

0

1

2

3

4

5

6

7

8

Ambient Temperature ( oC )

Gmv (mA/mV)

VCC=1.7V
VCC=5V
VCC=18V

-20 0 20 40 60 80 100 120

0

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

17

18

19

20

Ambient Temperature ( oC )

Gmi (mA/mV)

VCC=1.7V
VCC=5V
VCC=18V

Performance Characteristics

Voltage Control Loop Reference Current Control Loop Reference

vs. Ambient Temperature vs. Ambient Temperature

Input Bias Current (V

vs. Ambient Temperature vs. Ambient Temperature

Transconductance of Voltage Control Loop Transconductance of Current Control Loop

Op-Amp vs. Ambient Temperature Op-Amp vs. Ambient Temperature

) Current Out of Pin I

CTRL

CTRL

at V

SENSE

AP4312

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-20 0 20 40 60 80 100 120

0

10

20

30

40

50

Ambient Temperature ( oC )

V

OLV

(mV)

VCC=1.7V
VCC=5V
VCC=18V

-20 0 20 40 60 80 100 120

0

10

20

30

40

50

Ambient Temperature ( oC )

V

OLC

(mV)

VCC=1.7V
VCC=5V
VCC=18V

-20 0 20 40 60 80 100 120

0

10

20

30

40

50

60

70

Ambient Temperature ( oC )

I

OSV

(mA)

VCC=1.7V
VCC=5V
VCC=18V

-20 0 20 40 60 80 100 120

0

10

20

30

40

50

60

70

Ambient Temperature ( oC )

I

OSC

(mA)

VCC=1.7V
VCC=5V
VCC=18V

-20 0 20 40 60 80 100 120

0

50

100

150

200

250

300

Ambient Temperature ( oC )

I

CC

(A)

VCC=1.7V
VCC=5V
VCC=18V

0 5 10 15 20 25 30 35

0

100

200

300

400

500

600

700

800

V

OL

(mV)

Sink Current (mA)

Performance Characteristics (Cont.)

Low Output Level of Voltage Control Loop Low Output Level of Current Control Loop

Op-Amp vs. Ambient Temperature Op-Amp vs. Ambient Temperature

Output Short Circuit Current of Voltage Control Output Short Circuit Current of Current Control

Loop Op-Amp vs. Ambient Temperature Loop Op-Amp vs. Ambient Temperature

Total Supply Current Not Including the Low Output Voltage Level vs. Sink Current

Output Sinking Current vs. Ambient Temperature

AP4312

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AP4312

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AP4312 XX XX - G1

Packing

Package

TR : Tape & Reel

K6 : SOT26

G1 : Green

Product Name

RoHS/Green

Package

Part Number

Marking ID

Packing

SOT26

AP4312K6TR-G1

GKD

3000/Tape & Reel

: Logo

XXX: Marking ID (See ordering information)

Ordering Information

Diodes IC’s Pb-free products with "G1" suffix in the part number, are RoHS compliant and green.

Marking Information

AP4312

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2.820(0.111)

3.100(0.122)

2.650(0.104)

3.000(0.118)

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)

0.500(0.020)

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)

0.150(0.006)

0.900(0.035)

1.300(0.051)

1.450(0.057)
MAX

1 2 3

4

5

6

Pin 1 Mark

Package Outline Dimensions (All dimensions in mm(inch).)

(1) Package Type: SOT26

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E E

G

Z

Y

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

Suggested Pad Layout

(1) Package Type: SOT26

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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).

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