Diodes AP3012 User Manual

Data Sheet

1.5MHz STEP-UP DC-DC CONVERTER AP3012

General Description

The AP3012 is a high power, constant frequency, cur­rent mode PWM, inductor based, step-up (boost) con­verter. The converter operates at high frequency
(1.5MHz) so that a small, low profile inductor can be
used.

The AP3012 has built-in overvoltage protection (OVP)
to allow the device goes into shutdown mode when the
output voltage exceeds the OVP threshold of 29V.

The AP3012 is available in standard SOT-23-5 pack­age.

Features

· High Efficiency up to 81%

· Adjustable Output Voltage up to 29V

· Shutdown Current 1

· 1.5MHz Switching Frequency

· 36V 500mA Rugged Integrated Bipolar Switch

· Built-in Soft-start to Reduce Inrush Current Dur-

ing Start-up

· On-chip Overvoltage Protection

· Uses Low ESR Ceramic Output Capacitor

· Uses Small Inductor

µA Typical

Applications

· LCD/OLED Display Bias Supply

· White LED Driver for LCD Display Backlights

· Cellular Phones

SOT-23-5

Figure 1. Package Type of AP3012

May 2010 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

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Data Sheet

1.5MHz STEP-UP DC-DC CONVERTER AP3012

Pin Configuration

K Package

(SOT-23-5)

1

SW

GND

FB

Figure 2. Pin Configuration of AP3012 (Top View)

2

34

5

V

IN

SHDN

Pin Description

Pin Number Pin Name Function

Switch Pin. Connect inductor/diode here. The output voltage can go up to 29V but should not

1SW

2 GND Ground Pin. Connect directly to local ground plane

3 FB Feedback Pin. Internally compares to 1.25V. Connect R1 and R2 resistor divider here. Calcu-

4 SHDN

5V

IN

exceed this limit. If the voltage on this pin is higher than the overvoltage protection (OVP)
threshold, the device can go into shutdown mode. It can be restarted by a low to high pulse on
the SHDN pin, or by a power on reset on the VIN supply

late the Output Voltage according to the formula: V

Shutdown Pin. Connect to 1.5V or higher to enable device (ON), 0.4V or lower to disable
device (OFF)

Input Supply Pin. Must be locally bypassed

=1.25V * (1+R1/R2)

OUT

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Data Sheet

1.5MHz STEP-UP DC-DC CONVERTER AP3012

Functional Block Diagram

1

Q1

0.2 Ω

SW

GND

2

FB

V

IN

SHDN

OVP

3

A1

5

V

REF

1.25V
SOFT

START

COMPARATOR

R

C

C

C

A2

DRIVER

R

Q

S

Σ

4

SHUTDOWN

RAMP

GENERATOR

1.5MHz

OSCILLATOR

Figure 3. Functional Block Diagram of AP3012

May 2010 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

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Data Sheet

1.5MHz STEP-UP DC-DC CONVERTER AP3012

Ordering Information

AP3012 -

Circuit Type

Package

K: SOT-23-5

Package

SOT-23-5

BCD Semiconductor's Pb-free products, as designated with "E1" suffix in the part number, are RoHS compliant. Products with
"G1" suffix are available in green package.

Temperature

Range

-40 to 85

o

AP3012KTR-E1 AP3012KTR-G1 E6B G6B Tape & Reel

C

Part Number Marking ID

Lead Free Green Lead Free Green

E1: Lead Free
G1: Green

TR: Tape and Reel

Packing Type

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Data Sheet

1.5MHz STEP-UP DC-DC CONVERTER AP3012

Absolute Maximum Ratings (Note 1)

Parameter Symbol Value Unit

Input Voltage V

IN

SW Voltage 38 V

FB Voltage 5V

SHDN

Voltage 16 V

Thermal Resistance (Junction to Atmosphere, no Heat sink) R

θJA

Operating Junction Temperature 150

Storage Temperature Range T

Lead Temperature (Soldering, 10sec) T

STG

LEAD

ESD (Machine Model) 250 V

ESD (Human Body Model) 2000 V

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.

20 V

265

-65 to 150

260

o

C/W

o

C

o

C

o

C

Recommended Operating Conditions

Parameter Symbol Min Max Unit

Input Voltage V

Operating Temperature T

IN

OP

May 2010 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

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2.6 16 V

-40 85

o

C

Data Sheet

1.5MHz STEP-UP DC-DC CONVERTER AP3012

Electrical Characteristics

=3V, V

(V

IN

Parameter Symbol Conditions Min Typ Max Unit

Minimum Operating Volt­age

Maximum Operating Volt­age

Feedback Voltage V

FB Pin Bias Current V

Supply Current I

Supply Current I

Switching Frequency f 1.1 1.5 1.9 MHz

Maximum Duty Cycle D

Switching Current Limit Duty Cycle=80% 500 mA

Switch VCESAT V

Switch Leakage Current V

SHDN

Voltage High (ON) V

Vo l ta ge Lo w (O F F) V

SHDN

SHDN

Pin Bias Current 55 µA

=3V, TA=25oC, unless otherwise specified.)

SHDN

VIN=5V, V

FB

=1.25V 10 45 100 nA

FB

V

CC

Q

MAX

CESATISW

TH

TL

=VFB=VIN, No switching 2.5 3.5 mA

SHDN

V

=0V, VFB=0V 0.1 1.0 µA

SHDN

=250mA 300 mV

=5V 0.01 5 µA

SW

OUT

=24V, I

2.6 V

16 V

=30mA 1.17 1.25 1.33 V

OUT

85 90 %

1.5

0.4

V

OVP Voltage Threshold V

OVP

29 V

Soft-Start Time 550 µS

Thermal Resistance

θ

JC

69.57

o

C/W

(Junction to Case)

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Data Sheet

1.5MHz STEP-UP DC-DC CONVERTER AP3012

Typical Performance Characteristics

3.0

2.5

2.0

-50oC
25oC

1.5

1.0

100oC

Quiescent Current (mA)

0.5

0.0
0 4 8 12 16

VIN (V)

Figure 4. Quiescent Current vs. Input Voltage

2.0

320

280

240

200

160

120

SHDN Pin Bias Current (µA)

80

40

-50 -25 0 25 5 0 75 100

SHDN=10V
SHDN=3.6V
SHDN=3V
SHDN=2.7V

Junction Temperature (oC)

Figure 5. SHDN Pin Bias Current

vs. Junction Temperature

70

1.6

1.2

0.8

Switching Frequency (MHz)

0.4

0.0

-50 -25 0 25 50 75 100

Junction Temperature (oC)

60

50

40

30

20

Feedback Bias Current (nA)

10

0

-50 -25 0 25 50 75 100

Junction Temperature (oC)

Figure 6. Switching Frequency Figure 7. Feedback Bias Current

vs. Junction Temperature vs. Junction Temperature

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Data Sheet

1.5MHz STEP-UP DC-DC CONVERTER AP3012

Typical Performance Characteristics (Continued)

85

80

75

70

65

Efficiency (%)

VIN=5V

60

V

=24V

OUT

=30mA

I

OUT

55

50

-50 -25 0 25 50 75 100

Junction Temperature (oC)

Figure 8. Efficiency vs. Junction Temperature

1200

1000

800

600

400

Switching Current Limit (mA)

200

0

020406080100

Duty Cycle (%)

Figure 9. Switching Current Limit vs. Duty Cycle

1.29

85

VIN=5V

1.28

1.27

1.26

I

Feedback Voltage (V)

1.25

1.24

-50 -25 0 25 50 75 100

Junction Temperature (oC)

OUT

OUT

=30mA

80

75

70

Efficiency (%)

65

60

0 5 10 15 20 25 30 35 40 45

V

OUT

L=10

=24V

Output Current (mA)

VIN=3.0V
VIN=3.6V
VIN=4.2V
VIN=5.0V

µH

V

=24V

Figure 10. Feedback Voltage vs. Junction Temperature Figure 11. Efficiency vs. Output Current

May 2010 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

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Data Sheet

1.5MHz STEP-UP DC-DC CONVERTER AP3012

Typical Application

V

5V

OFF

Note: V

IN

ON

=1.25*(1+R1/R2)=1.25*19.2=24V

OUT

VIN SW

SHDN

GND

C1

1µF

L1

10µΗ

AP3012 FB

C: X5R or X7R Dielectric
L: SUMIDA CDTH3D14/HPNP-100NC or Equivalent

Figure 12. LCD/OLED Display Bias Driver Typical Circuit

D1

1N5819

92.82K

5.1K

R1

R2

C2

1µF

V

OUT

24V

RLOAD

May 2010 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

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Data Sheet

1.5MHz STEP-UP DC-DC CONVERTER AP3012

Mechanical Dimensions

SOT-23-5 Unit: mm(inch)

2.820(0.111)

3.020(0.119)

)

)
2

4
2

1

0

0

.

.

0

)

)

9

)

)

4

6

0

1

1

1

.

.

0

0

(

(

0

0

5

5

6

9

.

.

2

2

7

5

6

0

0

.

.

0

0

(

(

0

0

0

0

5

7

.

.

1

1

0.200(0.008)

7

.

0

0

(

(

0

0
0

0

3

6

.

.

0

0

0

0

)

8

2

0

.

0

(

F

R

E

0.100(0.004)

0.200(0.008)

0.950(0.037)

P

Y

T

)
7
5
0

.

X

0

A

(
0

M

5
4

.
1

1.800(0.071)

2.000(0.079)

0.300(0.012)

0.400(0.016)

0

0

0

0

0

9

.

.

1

(

0

0

3

0°

8°

0

(

0

0

0

.

5

1

.

0

.

0

(

0

.

0

)

0

0

.

0

0

(

0

)

6

0

.

0

5

3

)

)

1

5

May 2010 Rev. 1. 6 BCD Semiconductor Manufacturing Limited

10

BCD Semiconductor Manufacturing Limited

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