Datasheet AP1604 Datasheet (AnaChip)

AP1604

PWM/PFM Dual Mode Step-down DC/DC Converter

 Features

- Input voltage range: 2.2V~5.5V (V

- Oscillator frequency: 600KHz (Typ.)

- Internal reference: 1.0V (Typ.)

- High efficiency: 93% (Typ .)

- Stand-by capability: I

=2µA. (Typ.)

STB

- Soft-start time set-up externally type possible

- Current limit and thermal shutdown protection

- Pb-Free Package: SOT23-5, SON-6(3×3×0.8mm)

OUT

type)

 Applications

● Electronic Information Organizers

● Palmtops

● Cellular and portable phones

● Portable Audio Systems

● Various Multi-function Power Supplies

 Pin Assignment

(Top View)

GND

CE/SS

V

CC

6

5

4

V

OUT

V

CC

GNDCE

SV

FB

5 4

1 32

V

OUT

FB

1

2

CC

3

AP1604A

SOT23-5

 General Descriptions

The AP1604 series are multi-functional step-down
DC/DC converters with built-in speed, low ON
resistance drivers. It is capable to deliver more than
800mA output current with external coil, diode and
capacitor.

Output voltage is set-up by the external resistors. (±

2.5% accuracy). The 600KHz AP1604 that can
work out with small value external components
comes out more compact board.

The device switches to and works under PFM mode
with light loads. It keeps at high efficiency for both
light loads and large output current.

AP1604 can be soft-start with a proper capacitor
connected between CE/SS pin and ground. The
stand-by current is less than 2uA when CE/SS pin
is at “LOW” status. The device is forced to switch
off as the voltage at that pin is lower than the
stipulated voltage.

 Pin Descriptions

Pin Name Function

V

Output Voltage

OUT

VCC Input Supply

GND Ground

CE/SS Chip Enable / Soft Start

FB Feedback pin

SVCC Signal Power for SON only

SON-6

This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.

1/7

Rev.1.1 Jun. 27, 2005

AP1604

PWM/PFM Dual Mode Step-down DC/DC Converter

 Ordering Information

AP1604 X X X

Version

A: AP1604A

Package

W: SOT23-5

Packing

A : Taping

SN: SON-6 (3*3*0.8mm)

 Block Diagrams

SV

CC

FB

Phase

Compensation

Current Limit

+

ERR
AMP

+

-

Soft

Start

CE/SS GND

Vref with

CE

PWM/PFM

Controller

-

Comparator

Ramp Wave

Generator,

OSC

PWM

V

V

CC

OUT

 Absolute Maximum Ratings

Ta=25°C

Symbol

VCC/SVCC VIN Pin Voltage -0.3 ~ 6.5 V

V

V

OUT

Pin Voltage -0.3 ~ VIN+0.3 V

OUT

VFB FB Pin Voltage -0.3 ~ VIN+0.3 V

V

CE/SS Pin Voltage -0.3 ~ VIN+0.3 V

CE/SS

Pd

Topr

Continuous Total
Power Dissipation

Operating Ambient
Temperature

Tstg Storage Temperature -40 ~ +125 °C

Anachip Corp.
www.anachip.com.tw

Parameter Ratings

Internal limited

-25 ~ +80 °C

2/7

Units

Rev.1.1 Jun. 27, 2005

AP1604

)

PWM/PFM Dual Mode Step-down DC/DC Converter

 Electrical Characteristics

VIN=5V, V

＝2V, Load=300mA, Ta=25°C

OUT

Sym. Parameter Conditions Min. Typ. Max. Units

VFB FB 0.975 1.0 1.025 V

VIN Input Voltage 2.2 - 5.5 V

Line Regulation VIN=2.2~5.5V, Load=10mA - - 0.12 %
Load Regulation I

V

UVLO Voltage（min.

UVLO

operating voltage）

=10~800mA - - 1.2 %

OUT

, voltage required to maintain H at

V

CC

V

OUT

- - 2 V

ICC Operating Current CE/SS=VIN, No Load - 100 150 µA

I

Supply Current

CCQ

I

Stand-by Current

STB

ICL Current Limit

Fosc Oscillator Frequency Load=300mA, VIN=5V, V

No external components,
CE/SS=V

IN, VFB

=1.2V
No external components,
CE/SS=0V,

VFB

=0V
peak current
V

IN

=5V, V

OUT

=2V

- 90 120 µA

- 2 - µA

800 1000 1200 mA

=2V 500 600 700 kHz

OUT

MAXDTY Maximum Duty Ratio 85 90 - %

PFMDTY PFM Duty Ratio No load 15 25 35 %

V

CE/SS ”High” Voltage

CEH

V

CE/SS ”Low” Voltage Same as V

CEL

EFFI Efficiency VCC=5V, V

Rdson Rdson Condition I

Apply 1.4V (min.) to CE/SS, determine
V

”High”

OUT

=300mA, VIN=5V, V

OUT

, determine V

CEH

=3.3V, Load=300mA - 93 - %

OUT

OUT

/”Low” - - 0.6 V

OUT

=2V - 350 450 mΩ

1.4 - - V

 Typical Performance Characteristics

Vcc v.s. Operating Current Vcc v.s. Quiescent Current

200

180

160

140

120

100

80

60

40

Operating Current (uA)

20

0

2.5 3 3.5 4 4.5 5 5.5

Vcc (V

200

180

160

140

120

100

80

60

40

Quiescent Current (uA)

20

0

2.533.544.555.5

Vcc (V)

Anachip Corp.
www.anachip.com.tw

3/7

Rev.1.1 Jun. 27, 2005

AP1604

)

PWM/PFM Dual Mode Step-down DC/DC Converter

 Typical Performance Characteristics (Continued)

Vcc v.s. Stand-by Current Vcc v.s. Frequency

6

5.5
5

4.5
4

3.5
3

2.5
2

1.5
1

Stand-by Current (uA)

0.5
0

2.5 3 3.5 4 4.5 5 5.5

Vcc (V)

Vcc v.s. Current Limit Vcc v.s. R

1.4

1.3

1.2

1.1

0.9

0.8

0.7

Current Limit (A)

0.6

0.5

Current Limit

1

Vout=2V

3 3.5 4 4.5 5 5.5

Vcc (V

Line Regulation Load Regulation

0.3

700

680

660

640

620

600

580

560

Frequency (KHz)

540

520

500

2.533.544.555.5

Vcc (V)

DS(ON)

600

500

400

(mΩ)

300

DS(ON)

200

R

100

0

2.5 3 3.5 4 4.5 5 5.5

3

Vcc (V)

0.2

0.1

(%)

0.0

OUT

-0.1

V / V

-0.2

-0.3

2.533.544.555.5

Anachip Corp.
www.anachip.com.tw

Vcc (V)

4/7

2

1

0

(%)

OUT

-1

V / V

-2

-3
0 100 200 300 400 500 600 700 800

Load (mA)

Rev.1.1 Jun. 27, 2005

AP1604

×

PWM/PFM Dual Mode Step-down DC/DC Converter

 Typical Application Circuit

2.2V ~ 5.5V
V

IN

Ω

1M

68uF

0.1uF

 Marking Information

CE/SS

10nF

100nF

V

CC

~

V

OUT

AP1604A

GND

FB

Vout = 1

R1=100K ~ 200K

(1 +

10uH

B240A R2

R2

)

R1

R1

0.1uF 68uF

V

OUT

(1) SOT23-5L

7

45

XX Y M

12

3

SOT23-5L

(2) SON-6L (3*3*0.8mm)

XX
XX

XX

: Identification code

(See Appendix)

Y

: Year: 0-9

M

: Month: A~L

Identification Code

( See the table )

Date Code

Year: 0~9
Month: A~L

Appendix

Part Number Package

Identification

Code

AP1604A SOT23-5 ER

Appendix

Part Number Package

AP1604A

SON-6L

(3*3*0.8mm)

Identification

code

S4

Anachip Corp.
www.anachip.com.tw

5/7

Rev.1.1 Jun. 27, 2005

AP1604

PWM/PFM Dual Mode Step-down DC/DC Converter

 Package Information

(1) Package Type: SOT23-5L

D

e1

5

123

e

With

Plating

4

A2

E1

E

b

b1

A

A1

θ

2(4x)

θ

1(4x)

C

0.10
5x

Seating Plane

Base

Metal

C

b

C1

Gauge Plane

L

L1

0.25 mm

θ

Symbol

Dimensions In Millimeters Dimensions In Inches

Min. Nom. Max. Min. Nom. Max.

A 1.05 1.20 1.35 0.041 0.047 0.053

A1 0.05 0.10 0.15 0.002 0.004 0.006

A2 1.00 1.10 1.20 0.039 0.043 0.047

b 0.25 - 0.55 0.010 - 0.022

b1 0.25 0.40 0.45 0.010 0.016 0.018

c 0.08 - 0.20 0.003 - 0.008

c1 0.08 0.11 0.15 0.003 0.004 0.006

D 2.70 2.85 3.00 0.106 0.112 0.118

E 2.60 2.80 3.00 0.102 0.110 0.118

E1 1.50 1.60 1.70 0.059 0.063 0.067

L 0.35 0.45 0.55 0.014 0.018 0.022

L1 0.60 Ref. 0.024 Ref.

e 0.95 Bsc. 0.037 Bsc.

e1 1.90 Bsc. 0.075 Bsc.

θ

θ1

θ2

o

0

5

o

3

5

o

8

6

o

10o 0

o

7

o

10o 6

o

3

o

5

o

5

o

8

o

10o

o

7

o

10o

o

Anachip Corp.
www.anachip.com.tw

6/7

Rev.1.1 Jun. 27, 2005

AP1604

PWM/PFM Dual Mode Step-down DC/DC Converter

 Package Information (Continued)

(2) SON-6L (3

×3×0.8mm)

C 0.25

2x

Pin1 ID Area

E

C0.10

SEATING PLANE

E1

Symbol

Dimensions In Millimeters Dimensions In Inches

Min. Nom. Max. Min. Nom. Max.

A 0.70 0.75 0.80 0.028 0.030 0.031
A1 0.00 0.02 0.05 0.000 0.001 0.002
A3 0.203 REF. 0.008 REF

b 0.30 0.40 0.45 0.012 0.016 0.018

D 2.90 3.00 3.10 0.114 0.118 0.122
D1 1.90 2.10 2.30 0.075 0.083 0.091

E 2.90 3.00 3.10 0.114 0.118 0.122
E1 1.30 1.50 1.70 0.051 0.059 0.067

L 0.30 0.40 0.50 0.012 0.016 0.020

e 0.95 BSC. 0.037 BSC.

e1 1.90 BSC. 0.075 BSC.

y 0.00 - 0.08 0.000 - 0.003

L

Anachip Corp.
www.anachip.com.tw

7/7

Rev.1.1 Jun. 27, 2005

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