Anpec APW7079-18D, APW7079-26D, APW7079-28D, APW7079-30D, APW7079-33D Schematics

APW7079

Low-Supply-Current Synchronous Step-up DC-DC Converter

Features

• 0.9V Typical Start-up Input Voltage

• 11µA Typical No Load Quiescent Current

• PFM Operation

• High Efficiency up to 92%

• Fixed 1.8V, 2.6V, 2.8V, 3V, 3.3V, 3.8V, 4.5V or 5V

Output Voltage

• 600mA Internal Switch Current

• Internal Synchronous Rectifier

• SOT-89 Package

• Lead Free and Green Devices Available

(RoHS Compliant)

Applications

• Toy

• Wireless Mouse

• Portable Instrument

Pin Configuration

SOT-89

General Description

The APW7079 is a compact, PFM mode, and step-up
DC-DC converter with low quiescent current. The inter­nal synchronous rectifier reduces cost and PCB space
by eliminating the need for an external Schottky diode.
Low on-resistance of the internal switches improves the
efficiency up to 92%. The start-up voltage is guaranteed
below 1V. After start-up, the device can operate with input
voltage down to 0.7V. The APW7079 is suitable for por­table battery-powered applications. Consuming only 11µA
quiescent current and an optimized control scheme al­lows the device to operate at very high efficiency over the
entire load current range.

Efficiency vs. Output Current

100

90
80
70
60
50
40

Efficiency (%)

30
20
10

VIN=0.9V

VIN=1.0V

VIN=1.2V

VIN=1.5V

0

0.1 1 10 100 1000

VIN=2.4V

APW7079-30

Output Current, I

OUT

(mA)

Simplified Application Circuit

2

LX 3

(TAB)

GND 1

VOUT

Top View

ANPEC reserves the right to make changes to improve reliability or manufacturability without notice, and
advise customers to obtain the latest version of relevant information to verify before placing orders.

Copyright  ANPEC Electronics Corp.
Rev. A.4 - Jun., 2009

V

I

IN

IN

L1

22µH

C1
22µF

APW7079

LX VOUT

GND

V

I

OUT

OUT

C2
47µF

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APW7079

79

Ordering and Marking Information

Package Code

APW7079

Assembly Material
Handling Code
Temperature Range
Package Code
Voltage Code

APW7079-18D: XXXXX - Date Code, 18: 1.8V

APW7079-28D: XXXXX - Date Code, 28: 2.8V

APW7079-33D: XXXXX - Date Code, 33: 3.3V

APW7079-45D: XXXXX - Date Code, 45: 4.5V

APW7079
XXXXX18

APW7079
XXXXX28

APW7079
XXXXX33

APW7079
XXXXX45

Note: ANPEC lead-free products contain molding compounds/die attach materials and 100% matte tin plate termination finish; which
are fully compliant with RoHS. ANPEC lead-free products meet or exceed the lead-free requirements of IPC/JEDEC J-STD-020C for
MSL classification at lead-free peak reflow temperature. ANPEC defines “Green” to mean lead-free (RoHS c ompliant) and halogen
free (Br or Cl does not exceed 900ppm by weight in homogeneous material and total of Br and Cl does not exceed 1500ppm by
weight).

D : SOT-89
Operating Ambient Temperature Range
I : -40 to 85oC
Handling Code
TR : Tape & Reel
Assembly Material
G : Halogen and Lead Free Device
Voltage Code
18: 1.8V 26: 2.6V 28: 2.8V 30: 3.0V
33: 3.3V 38: 3.8V 45: 4.5V 50: 5.0V

APW7079-26D: XXXXX - Date Code, 26: 2.6V

APW7079-30D: XXXXX - Date Code, 30: 3.0V

APW7079-33D: XXXXX - Date Code, 38: 3.8V

APW7079-50D: XXXXX - Date Code, 50: 5.0V

APW7079
XXXXX26

APW7079
XXXXX30

APW7079
XXXXX38

APW7079
XXXXX50

Absolute Maximum Ratings (Note 1)

Symbol Parameter Rating Unit

V

OUT

V

LX

T

STG

T

SDR

Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Exposure to absolute

Output Voltage (VOUT to GND) -0.3 ~ 6 V
LX to GND Voltage -0.3 ~ V
Storage Temperature -65 ~ 150

Maximum Lead Soldering Temperature, 10 Seconds 260

+1 V

OUT

°C
°C

maximum rating conditions for extended periods may affect device reliability.

Thermal Characteristics

Symbol Parameter Typical Value Unit

θJA

Note 2: θJA is measured with the component mounted on a high effective thermal conductivity test board in free air.

Thermal Resistance -Junction to Ambient
SOT-89

(Note 2)

180

o

C/W

Recommended Operating Conditions (Note 3, 4)

Symbol Parameter Range Unit

V

Output Voltage (VOUT to GND) 0.7 ~ 5.5 V

OUT

VIN Converter Supply Voltage 0.3 ~ V
VLX LX to GND Voltage -0.3 ~ V

I

Converter Output Current 0 ~ 0.9 x I

OUT

TA Ambient Temperature -40 ~ 85 °C
TJ Junction Temperature -40 ~ 125 °C

Note 3: Refer to the typical application circuit
Note 4: Refer to “Application Information” for detail value.

Copyright  ANPEC Electronics Corp.
Rev. A.4 - Jun., 2009

+1 V

OUT

+0.3 V

OUT

A

OUT(MAX)

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APW7079

Electrical Characteristics

Refer to Typical Application Circuits. VIN=1.5V, R

Symbol

Parameter Test Conditions

VIN Converter Supply Voltage 0.7 - 5.5 V

Start-up Voltage

V

Output Voltage

OUT

IDD Supply Current

T

OFF(MIN)

T

ON(MAX)

Main Switch Min. Off-time 0.6 0.9 1.2
Main Switch Max. On-time 3 4 5

Main Switch Max. Duty 75 - 85

R

Main Switch on Resistance ILX=100mA

N-FET

R

P-FET

I

Synchronous Switch on
Resistance

Main Switch Current Limit 500 600 700 mA

LIM

Main Switch Leakage Current - - 1

Synchronous Switch Leakage
Current

Over-Temperature Shutdown - 150 - °C
Over-Temperature Hysteresis - 40 - °C

= ∞, and TA= -40 ~ 85oC, unless otherwise noted. Typical values are at TA=25oC.

LOAD

APW7079

Min. Typ. Max.

R

=3kΩ

LOAD

APW7079-18 1.764
APW7079-26 2.548
APW7079-28 2.744

- 0.9 1 V

1.8 1.836

2.6 2.652

2.8 2.856
APW7079-30 2.94 3.0 3.06
APW7079-33 3.234
APW7079-38 3.724

3.3 3.366

3.8 3.876
APW7079-45 4.41 4.5 4.59
APW7079-50 4.9 5.0 5.1

V

= V

OUT

Measured at V

(Typ.)+0.5V

OUT

OUT

7 11 15

No Inductor Connected

APW7079-18 - 0.5 ­APW7079-26 - 0.4 ­APW7079-28 - 0.4 ­APW7079-30 - 0.4 ­APW7079-33 - 0.4 ­APW7079-38 - 0.4 ­APW7079-45 - 0.3 ­APW7079-50 - 0.3 ­APW7079-18 - 1 ­APW7079-26 - 0.8 ­APW7079-28 - 0.8 -

ILX=100mA

APW7079-30 - 0.7 ­APW7079-33 - 0.6 ­APW7079-38 - 0.5 ­APW7079-45 - 0.4 ­APW7079-50 - 0.4 -

- - 1

Unit

V

µA

µs
µs

%

Ω

Ω

µA
µA

Copyright  ANPEC Electronics Corp.

www.anpec.com.tw3

Rev. A.4 - Jun., 2009

APW7079

Typical Operating Characteristics

(Refer to the application circuit in the section “Typical Application Circuit”, VIN=1.5V, L1=22µH, TA=25oC unless otherwise noted.)

Efficiency vs. Output Current

100

90
80
70

VIN=0.9V

60

Efficiency (%)

50
40
30
20
10

0

VIN=1.0V

VIN=1.2V

VIN=1.5V

APW7079-18

0.1 1 10 100 1000

Output Current, I

OUT

(V)

OUT

Output Voltage, V

(mA)

Output Voltage vs. Output Current

1.84

1.82

1.80

1.78

1.76

1.74

1.72

1.70

1.68

1.66

1.64

VIN=0.9V

VIN=1.0V

VIN=1.2V

VIN=1.5V

APW7079-18

0 50 100 150 200 250 300

Output Current, I

OUT

(mA)

Efficiency vs. Output Current

100

90
80
70

VIN=0.9V

60
50
40

Efficiency (%)

30
20
10

0

0.1 1 10 100 1000

VIN=1.0V

VIN=1.2V

VIN=1.5V

Output Current, I

APW7079-30

OUT

Output Voltage vs. Output Current

100

90
80
70
60
50

VIN=0.9V

40

Efficiency (%)

30
20
10

0

VIN=1.0V

VIN=1.2V

VIN=1.5V

0.1 1 10 100 1000

Output Current, I

VIN=2.4V

APW7079-50

OUT

VIN=2.4V

(mA)

VIN=3.6V

(mA)

Output Voltage vs. Output Current

3.1

3.0

(V)

OUT

2.9

2.8

2.7

Output Voltage, V

VIN=0.9V

2.6
0 50 100 150 200 250 300 350 400

Output Voltage vs. Output Current

6

5

(V)

4

OUT

3

VIN=0.9V

2

Output Voltage, V

1

0

0 50 100 150 200 250 300 350

VIN=1.0V

Output Current, I

VIN=1.0V

VIN=1.2V

Output Current, I

VIN=1.2V

VIN=1.5V

VIN=2.4V

VIN=1.5V

APW7079-30

(mA)

OUT

VIN=3.6V

VIN=2.4V

APW7079-50

(mA)

OUT

Copyright  ANPEC Electronics Corp.
Rev. A.4 - Jun., 2009

www.anpec.com.tw4

APW7079

Typical Operating Characteristics (Cont.)

(Refer to the application circuit in the section “Typical Application Circuit”, VIN=1.5V, L1=22µH, TA=25oC unless otherwise noted.)

Start-up/Hold-on Voltage vs.

Output Current

Start-up

1

Hold-on

(V)

HOLD

/V

ST

1.4

1.2

0.8

0.6

0.4

Start-up/Hold-on Voltage vs.

Output Current

Start-up

1

Hold-on

(V)

HOLD

/V

ST

1.4

1.2

0.8

0.6

0.4

0.2

Start-up/Hold-on Voltage, V

0

0 10 20 30 40 50

Output Current, I

Start-up/Hold-on Voltage vs.

1.4

(V)

1.2

HOLD

/V

1

ST

0.8

0.6

0.4

0.2

Start-up/Hold-on Voltage, V

0

0 10 20 30 40 50

Output Current

Start-up

Hold-on

Output Current, I

Main Switch ON Resistance vs.

Junction Temperature

(Ω)

N-FET

0.8

0.7

0.6

APW7079-18

(mA)

OUT

APW7079-50

(mA)

OUT

0.2

0

Start-up/Hold-on Voltage, V

0 10 20 30 40 50

Output Current, I

No Load Battery Current

70

60

(µA)

IN

50

40

30

20

10

No Load Battery Current, I

APW7079-18

0

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5

vs. Input Voltage

Input Voltage, VIN (V)

Synchronous Switch ON Resis-

tance vs. Junction Temperature

1.6

1.4

1.2

APW7079-30

OUT

APW7079-50

APW7079-30

(mA)

0.5

0.4

0.3

0.2

0.1

0

Main Switch ON Resistance, R

APW7079-50

-50 -25 0 25 50 75 100 125

APW7079-30

APW7079-18

Junction Temperature, TJ (oC)

Copyright  ANPEC Electronics Corp.
Rev. A.4 - Jun., 2009

1.0

0.8

(Ω)

P-FET

0.6

R

0.4

0.2

0.0

Synchronous Switch ON Resistance,

APW7079-50

-50 -25 0 25 50 75 100 125

APW7079-30

Junction Temperature, TJ (oC)

APW7079-18

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APW7079

Operating Waveforms

Load Transient Response

I

=10mA -> 110mA -> 10mA

OUT

I

rise/fall time = 1µs

OUT

VIN=1.5V

2

110mA

I

OUT

10mA

V

3

CH2: I
CH3: V

, 100mA/Div, DC

OUT

, 50mV/Div, AC

OUT

OUT

Time: 0.1ms/Div

Heavy Load Switching Waveform

Line Transient Response

V

IN

1.5V

1

3

CH1: VIN, 0.5V/Div, DC
CH3: V

OUT

Time: 0.1ms/Div

, 50mV/Div, AC

2V

V

OUT

I

=100mA, VIN=1.5V

OUT

2

I

LX

V

OUT

3

V

LX

4

CH2: ILX, 200mA/Div, DC
CH3: V

, 50mV/Div, AC

OUT

CH4: VLX, 2V/Div, DC
Time: 5µs/Div

Copyright  ANPEC Electronics Corp.
Rev. A.4 - Jun., 2009

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