AP1603WA [ANACHIP]

Step-Up DC/DC Converter; 升压型DC / DC转换器


型号：	AP1603WA
厂家：	ANACHIP CORP
描述：	Step-Up DC/DC Converter 升压型DC / DC转换器转换器光电二极管
文件：	总8页 (文件大小：167K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

AP1603

Step-Up DC/DC Converter

Features

General Description

-A Guaranteed Start-Up from less than 0.9 V.

-High Efficiency.

The AP1603 is a high efficiency step-up DC/DC

converter for applications using 1 to 2 NiMH battery

cells. Only three external components are required

to deliver a fixed output voltage of 3.3V. The

AP1603 starts up from less than 0.9V input with

1mA load. Pulse Frequency Modulation scheme

brings optimized performance for applications with

light output loading and low input voltages. The

output ripple and noise are lower compared with the

circuits operating in PSM mode.

-Low Quiescent Current.

-Less Number of External Components needed.

-Low Ripple and Low Noise.

-Space Saving Pb-Free Packages: SOT23-6

Applications

The PFM control circuit operating in 150KHz (max.)

switching rate results in smaller passive

components. The space saving SOT23-6 packages

make the AP1603 an ideal choice of DC/DC

converter for space conscious applications, like

pagers, electronic cameras, and wireless

microphones.

-Pagers.

-Cameras.

-Wireless Microphones.

-Pocket Organizers.

-Battery Backup Suppliers.

-Portable Instruments.

Pin Assignments

Pin Descriptions

Name

Description

1.2V Reference Voltage. Bypass with a 0.1µF

REF

capacitor.

SHDN

Power Output. OUT provides bootstrap power

OUT

to the IC.

AP1603

N-Channel and P-Channel Power MOSFET

OUT

GND

REF

Drain

GND Ground

Shutdown Input. Drive high (>80% of V_OUT) for

operating mode. Drive low (<20% of V_OUT) for

shutdown mode. Connect to OUT for normal

operation.

SOT23-6L

SHDN

FB Feedback

Ordering Information

AP1603

Package

Packing

Blank : Tube

: Taping

W: SOT23-6L

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.

Rev.1.0 Jun. 3, 2004

1/8

AP1603

Step-Up DC/DC Converter

Block Diagram

0.1uF

22uH

Zero

OUT

Minimum

Off-Time

Crossing

Amplifier

47uF

SHDN

One-Shot

TRIG

One-Shot

V_IN

47uF

F/F

GND

Maximum

On-Time

One-Shot

Current-Limit

Amplifier

TRIG

One-Shot

Error

Amplifier

REF

0.1uF

Absolute Maximum Ratings

Symbol

V_CC

Parameter

Supply Voltage (OUT to GND)

REF to GND

Rating

-0.3 to 5.5

-0.3 to V_OUT+0.3

-0.8 to 0.2

Unit

V_REF

V_SW

I_OUT

Switch Voltage (LX to GND)

Output Current (OUT)

I_SW

T_ST

T_OT

Switch Current (LX)

Storage Temperature Range

Operation Temperature Range

-0.8 to 0.2

-65 to +150

-40 to +80

^oC

Anachip Corp.

www.anachip.com.tw

Rev.1.0 Jun. 3, 2004

2/8

AP1603

Step-Up DC/DC Converter

Electrical Characteristics

(V_IN=2V, FB=V_OUT, R_L= ∞, T_A= 0°C to +85°C, unless otherwise noted. Typical values are at T_A= +25°C.)

Symbol

Parameter

Conditions

Min.

Typ.

Max.

Unit

Minimum Input Voltage

0.9

V_IN

Operating Voltage

T_A= +25°C

1.1

5.5

T_A= +25°C,

Start-Up Voltage

0.9

1.1

RL = 3kΩ (Note 1)

Start-Up Voltage Tempco

Output Voltage Range

-4

5.5

mV/°C

FB=V_OUT=3.3V

V_IN=2.4V, FB=GND,

V_OUT=5V

100

150

Steady-State Output Current

I_OUT

(Note2)

V_REF

V_OUT

Reference Voltage

Output Voltage

I_REF=0

1.196

3.17

4.8

1.22

3.3

1.244

3.43

5.2

FB=V_OUT

FB=GND

TEMPCO

V_{REF_LOAD}

Reference Voltage Tempco

Reference Voltage Load

Regulation

0.05

mV/°C

_REF=0 to 30 μA

1.5

1.0

0.4

Reference Voltage Line

Regulation

V_{REF_LINE}

R_DS(ON)

V_IN=1.1V to 3.6V

I_LX=100mA

0.08

0.6

mV/V

Ω

Internal NFET, PFET

On-Resistance

LX Switch Current Limit

(NFET)

I_LIM

0.3

0.35

μA

µA

I_LEAK

LX Leakage Current

Operating Current into OUT

V_LX=0, 5.5V; V_OUT=5.5V

V_OUT=3.3V

0.05

Shutdown Current into OUT

0.1

µA

SHDN =GND

V_OUT=3.3V, I_LOAD=100mA

Efficiency

µs

t_ON

LX Switch On-Time

LX Switch Off-Time

t_OFF

1.0

1.2

1.4

=0 or V_OUT

V_SHDN

0.07

SHDN Input Current

I_SHDN

V_IL

0.2

Based on V_OUTVoltage

V_OUT

SHDN Input Voltage

V_IH

0.8

Note 1: Start-up voltage operation is guaranteed with the addition of a Schottky 1N5819 external diode between the input and output.

Note 2: Steady-state output current indicates that the device maintains output voltage regulation under load.

Anachip Corp.

www.anachip.com.tw

Rev.1.0 Jun. 3, 2004

3/8

AP1603

Step-Up DC/DC Converter

Typical Application Circuit

(1) V_OUT=5V

22uH

1.1V to 5.5V

V_IN

47uF

OFF

SHDN

REF

Fixed Output

( 5V )

OUT

47uF

GND

0.1uF

(2) V_OUT=3.3V

22uH

1.1V to 3.6V

V_IN

47uF

OFF

OUT

SHDN

REF

Fixed Output

( 3.3V )

47uF

GND

0.1uF

(3) V_OUT=Adj

22uH

1.1V to 5.5V

V_IN

47uF

OFF

SHDN

REF

Output

OUT

47uF

GND

0.1uF

V_OUT= V_REF(1+

)

Anachip Corp.

www.anachip.com.tw

Rev.1.0 Jun. 3, 2004

4/8

AP1603

Step-Up DC/DC Converter

Typical Performance Characteristics

STEADY STATE OUTPUT CURRENT

REFERENCE VOLTAGE v.s.

v.s.

TEMPERATURE

1.23

INPUT VOLTAGE

400

320

240

160

1.22

1.21

1.2

1.19

1.18

1.2 1.4 1.6 1.8

2 2.2 2.4 2.6 2.8 3

-40

-20

INPUT VOLTAGE (V)

TEMPERATURE (^oC)

START-UP VOLTAGE v.s.

LOAD CURRENT

NO LOAD INPUT CURRENT v.s.

INPUT VOLTAGE

175

150

125

100

1.8

1.6

1.4

1.2

with diode

1N5819

without diode

0.8

LOAD CURRENT (mA)

INPUT VOLTAGE (V)

Anachip Corp.

www.anachip.com.tw

Rev.1.0 Jun. 3, 2004

5/8

AP1603

Step-Up DC/DC Converter

Typical Performance Characteristics (Continued)

EFFICIENCY v.s.

INPUT VOLTAGE=2.4V

EFFICIENCY v.s.

INPUT VOLTAGE=1.2V

92.00

91.00

90.00

89.00

88.00

87.00

86.00

85.00

84.00

83.00

82.00

81.00

80.00

91.00

90.00

89.00

88.00

87.00

86.00

85.00

84.00

83.00

82.00

INPUT VOLTAGE=1.2 (V)

INPUT VOLTAGE=2.4 (V)

SHUTDOWN CURRENT

v.s. SUPPLY VOLTAGE

SHUTDOWN THRESHOLD VOLTAGE

v.s. SUPPLY VOLTAGE

1.6

0.8

0.6

0.4

0.2

-0.2

-0.4

-0.6

-0.8

-1

1.4

1.2

0.8

0.6

0.4

0.2

1.5

2.5

3.5

SUPPLY VOLTAGE (V)

Marking Information

XX Y M

Identification code

Month: A~L

Year: 0-9

(See Appendix)

Appendix

Part Number

AP1603

Identification

Code

Package

SOT23-6

Anachip Corp.

www.anachip.com.tw

Rev.1.0 Jun. 3, 2004

6/8

AP1603

Step-Up DC/DC Converter

Function Descriptions

General Description

Inductor Selection

AP1603 PFM (pulse frequency modulation) To operate as an efficient energy transfer element,

converter IC series combine a switch mode the inductor must fulfill three requirements. First, the

converter, power MOSFET, and precision voltage inductance must be low enough for the inductor to

reference in a single monolithic device. They offer store adequate energy under the worst case condition

both extreme low quiescent current, high efficiency, of minimum input voltage and switch ON time. Second,

and very low gate threshold voltage to ensure the inductance must also be high enough so

start-up with low battery voltage (0.9V typ.). maximum current rating of AP1603 and inductor are

Designed to maximize battery life in portable not exceed at the other worst case condition of

products, and minimize switching losses by only maximum input voltage and ON time. Lastly, the

switching as needed service the load. PFM inductor must have sufficiently low DC resistance so

converters transfer a discrete amount of energy excessive power is not lost as heat in the windings.

per cycle and regulate the output voltage by But unfortunately this is inversely related to physical

modulating switching frequency with the constant size. Minimum and Maximum input voltage, output

turn-on time. Switching frequency depends on load, voltage and output current must be established before

input voltage, and inductor value, and it can range and inductor can be selected.

up to 150KHz. The SW on resistance is typically 1

to 1.5 W to minimize switch losses. When the

output voltage drops, the error comparator enables

150KHz oscillator that turns on the MOSFET

around 7.5us and 2.5ms off time. Turning on the

MOSFET allows inductor current to ramp up,

storing energy in a magnetic field and when

MOSFET turns off that force inductor current

through diode to the output capacitor and load. As

the stored energy is depleted, the current ramp

down until the diode turns off. At this point,

inductor may ring due to residual energy and stray

capacitance. The output capacitor stores charge

when current flowing through the diode is high, and

release it when current is low, thereby maintaining

a steady voltage across the load. As the load

increases, the output capacitor discharges faster

and the error comparator initiates cycles sooner,

increasing the switching frequency. The maximum

duty cycle ensure adequate time for energy

transfer to output during the second half each

cycle. Depending on circuit, PFM converter can

operate in either discontinuous mode or

Capacitor Selection

A poor choice for a output capacitor can result in poor

efficiency and high output ripple. Ordinary aluminum

electrolyzers,

while

inexpensive

may

have

unacceptably poor ESR and ESL. There are low ESR

aluminum capacitors for switch mode DC-DC

converters which work much better than general

propose unit. Tantalum capacitors provide still better

performance at more expensive. OS-CON capacitors

have extremely low ESR in

a small size. If

capacitance is reduced, output ripple will increase.

Most of the input supply is supplied by the input

bypass capacitor. The capacitor voltage rating should

be at least 1.25 times greater than a maximum input

voltage.

continuous

conduction

mode.

Continuous

conduction mode means that the inductor current

does not ramp to zero during each cycle.

Anachip Corp.

www.anachip.com.tw

Rev.1.0 Jun. 3, 2004

7/8

AP1603

Step-Up DC/DC Converter

Package Information

Package Type: SOT23-6L

D (Typ.)

J (Ref.)

K (Ref.)

Dimensions In Millimeters

Dimensions In Inches

Symbol

Min.

2.70

2.60

1.40

0.30

Nom.

2.90

2.80

1.60

0.43

Max.

3.10

3.00

1.80

0.55

0.10

10^o

Min.

Nom.

0.114

0.110

0.063

0.017

Max.

0.106

0.102

0.055

0.012

0.000

0^o

0.122

0.118

0.071

0.022

0.004

10^o

0.05

0.002

0^o

1.90 Ref.

1.20 Ref.

0.12 Ref.

0.37 Ref.

0.60 Ref.

0.95 Ref.

0.075 Ref.

0.047 Ref.

0.005 Ref.

0.015 Ref.

0.024 Ref.

0.037 Ref.

Anachip Corp.

www.anachip.com.tw

Rev.1.0 Jun. 3, 2004

8/8

AP1603WA [ANACHIP]

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