AX5505 Datasheet. Www.s Manuals.com. R1.1 Axelite

User Manual: Marking of electronic components, SMD Codes WA, WA-***, WA1, WAB, WAF, WAM**, Wa***. Datasheets 2N7002, AAT1217ICA-3.3-T1, AX5505R42, BAW101, BZT52-C5V6, BZT52C6V2, BZX84-C75, BZX84C5V6, BZX84C5V6-AU, MIC3291-18YML, PDTA115ET, PZU10BA/DG, RP130K341D, RT9818A-22PB.

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1/11

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Rev.1.1 Oct.09 2011

AX5505

MICROPOWER VFM SYNCHRONOUS

STEP-UP DC/DC Converter

 GENERAL DESCRIPTION

The AX5505 is a high efficiency VFM synchronous Step-up DC/DC converter for

small, low input voltage or battery powered systems with ultra-low quiescent supply current.

The AX5505 accept a positive input voltage from start-up voltage to VOUT and convert it to

a higher output voltage in the 2.1V to 5.0V range.

The AX5505 combine ultra-low quiescent supply current and high efficiency to give

maximum battery life. The high switching frequency and the internally limited peak inductor

current permits the use of small, low cost inductors. Only three external components are

needed an inductor a diode and an output capacitor.

The AX5505 is suitable to be used in battery powered equipment where low noise,

low ripple and ultra-low supply current are required. Operating shutdown function is outside

controlling. If EN connects to GND, the IC was been shut down and then the supply current

is lower to 1uA.The AX5505 is available in very small packages: SOT23-3L, SOT23-5L and

SOT89-3L.

Typical applications are pagers, cameras and video camera, cellular telephones,

wireless telephones, palmtop computer, battery backup supplies, battery powered

equipment.

 FEATURES

- Very Low Supply Current is 13uA (typ.)

- Maximum shutdown current <1uA

- Output voltage is available form 2.1V to 5.0V by 0.1V steps

- Output Voltage Accuracy ±2%

- No Schottky Diode Required

- Output Current up to 100mA

- Low ripple and low noise

- Very low start-up voltage at 0.8V

- Few external components

- Low profile: SOT23-3L, SOT23-5L and SOT89-3L Pb-Free

2/11

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Rev.1.1 Oct.09 2011

AX5505

 BLOCK DIAGRAM

GND

VFM

CONTROL

Bandgap

Reference

VOUT

ERROR AMP.

LIMITER AMP.

ON/OFF

Control

N-MOS

P-MOS

Anti-Reverse

Comparator

(SOT23-5L Only)

 PIN ASSIGNMENT

The packages type: SOT23-3L, SOT23-5L and SOT89-3L; the pin assignment is given by:

EN NC

VOUTLX

1 2 3

SOT23-5L

GND

Top View

GND VOUT

Top View

SOT89-3L

123

Tab is VOUT

VOUT

Top View

GND

SOT23-3L

Name

Description

Chip Enable Pin (SOT23-5L Only)

VOUT

Output Voltage Pin

No Connect Pin

GND

Ground Pin

Switch input pin which connected

to inductor.

3/11

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Rev.1.1 Oct.09 2011

AX5505

 ORDER/MARKING INFORMATION

Order Information

Package Type

AX5505

X XX X

Packing

Blank : Bag

21 : 2.1V

22 : 2.2V

50 : 5.0V

VOUT

B: SOT23-5L

R: SOT23-3L

F: SOT89-3L A : Taping

Top Marking (SOT23-3L/SOT23-5L)

Top Marking (SOT89-3L)

WW:01~26 (A~Z)

27~52 (a~z)

Year: A=2010

1=2011

ID code:internal

LYWX

Identification code

5Part number

ID code: internal

WW: 01~26 (A~Z)

27~52 (a~z)

Year: A=2010

1=2011

505

Part Number

Identification Code

Part Number

Identification Code

AX5505-2.1V

AX5505-3.6V

AX5505-2.2V

AX5505-3.7V

AX5505-2.3V

AX5505-3.8V

AX5505-2.4V

AX5505-3.9V

AX5505-2.5V

AX5505-4.0V

AX5505-2.6V

AX5505-4.1V

AX5505-2.7V

AX5505-4.2V

AX5505-2.8V

AX5505-4.3V

AX5505-2.9V

AX5505-4.4V

AX5505-3.0V

AX5505-4.5V

AX5505-3.1V

AX5505-4.6V

AX5505-3.2V

AX5505-4.7V

AX5505-3.3V

AX5505-4.8V

AX5505-3.4V

AX5505-4.9V

AX5505-3.5V

AX5505-5.0V

4/11

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Rev.1.1 Oct.09 2011

AX5505

 ABSOLUTE MAXIMUM RATINGS (at TA = 25°C)

Characteristics

Symbol

Rating

Unit

VIN Pin Voltage

VIN

5.5

LX Voltage

VLX

5.5

OUT Pin Voltage

VOUT

5.5

EN Pin Voltage

VEN

-0.3 to VOUT+0.3

Storage Temperature Range

TSTG

-40 to +150

°C

Operating Junction Temperature Range

-20 to +100

°C

Power Dissipation

( TJ-TA ) / θJA

Thermal Resistance from Junction to case

SOT23-3L

θJC

180

°C/W

SOT23-5L

SOT89-3L

100

Thermal Resistance from Junction to ambient

SOT23-3L

θJA

250

°C/W

SOT23-5L

SOT89-3L

160

Note: θJA is measured with the PCB copper area of approximately 1 in2 (Multi-layer).

 ELECTRICAL CHARACTERISTICS

(VIN = VOUT × 0.6, IOUT=10mA, TA = 25°C, unless otherwise specified)

Characteristics

Symbol

Conditions

Min

Typ

Max

Units

Output Voltage Accuracy

△VOUT

-2

Start-up Voltage

VSTART-UP

IOUT=1mA

VIN =rising from 0 to 2V

0.8

0.95

Hold-on Voltage

VHOLD

IOUT=1mA

VIN =falling from 2 to 0V

0.6

Supply Current

ISUPPLY

No Load

Quiescent Current

IOUT =0mA, VIN=VOUT + 0.5V

Shutdown Current

(SOT23-5L Only)

ISD

VEN=0V

PMOS Switch ON

Resistance P-RDS(ON)

ILX=100mA

1000

mΩ

NMOS Switch ON

Resistance N-RDS(ON)

ILX=100mA

600

mΩ

Maximum Oscillator Frequency

FOSC

125

KHz

Oscillator Duty On

DON

To be measure on SW pin

Enable Input Threshold

(SOT23-5L Only)

VENH

Driver ON

0.75

VENL

Driver OFF

0.2

Enable Input Current

(SOT23-5L Only)

IENH

VEN=VIN

0.1

IENL

VEN=0V

Efficiency

VIN=1.5V,

VOUT=2.2V, IOUT=10mA

VIN=1.5V,

VOUT=3.0V, IOUT=10mA

5/11

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Rev.1.1 Oct.09 2011

AX5505

 APPLICATION CIRCUIT

(1) SOT23-3L/SOT89-3L

100μH

VIN

AX5505D/F

GND

VOUT

10μF

C 2

10μF

100μF

D1 (Option)

(2) SOT23-5L

100μH

VIN

AX5505B

GND

VOUT

10μF

C 2

10μF

Enable Input

100μF

D1 (Option)

 OPERATION

The AX5505 architecture is built around a VFM CONTROL logic core, switching

frequency is set through a built in oscillator. TON time is fixed (Typ. 5uS) while TOFF time is

determined by the error amplifier output, a logic signal coming from the comparison made

by the Error Amplifier Stage between the signal coming from the output voltage divider

network and the internal Band-Gap voltage reference (Vref). TOFF reaches a minimum (Typ.

1.7uS) when heavy load conditions are met (Clock frequency 125KHz). An over current

conditions, through the internal power switch, causes a voltage drop VLX=RDSON x ISW and

the VLX limiter block forces the internal switch to be off, so narrowing TON time and limiting

internal power dissipation. In this case the switching frequency may be higher than the

125KHz set by the internal clock generator.

6/11

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Rev.1.1 Oct.09 2011

AX5505

VFM control ensures very low quiescent current and high conversion efficiency even

with very light loads. Since the Output Voltage pin is also used as the device Supply

Voltage, the versions with higher output voltage present an higher internal supply voltage

that results in lower power switch RDSON, slightly greater output power and higher

efficiency. Moreover, bootstrapping allows the input voltage to sag to 0.6V (at IOUT=1mA)

once the system is started. If the input voltage exceeds the output voltage, the output will

follow the input, however, the input or output voltage must not be forced above 5.5V.

 APPLICATION INFORMATION

Input/output Capacitor Selection

The Output Ripple Voltage, as well as the Efficiency, is strictly related to the behavior

of these elements. The output ripple voltage is the product of the peak inductor current

and the output capacitor Equivalent Series Resistance (ESR). Best performances are

obtained with good high frequency characteristics capacitors and low ESR. The

recommended value of the Output Capacitance is 10µF Ceramic Capacitor; Connected a

100μF aluminum electrolytic capacitor in VOUT can reduce Output Ripple and improve

Efficiency.

An Input Capacitor is required to compensate, if present, the series impedance

between the Supply Voltage Source and the Input Voltage of the Application. A ceramic

capacitor in 10µF is suitable for all application.

Inductor Selection

A 100μH inductor is recommended for most AX5505 applications. However, the

inductance value is not critical, and the AX5505 will work with inductors in the 82µH to

150µH.

Diode Option

Need to add diode to improve systematic performance in two kinds of following situations.

1. In the heavily loaded start to reduce start-up voltage.

2. Input voltage close to or exceed the output voltage (Vout-0.5V<VIN<Vout+0.5V) reduces

the output voltage ripple.

7/11

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Rev.1.1 Oct.09 2011

AX5505

 TYPICAL CHARACTERISTICS

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Rev.1.1 Oct.09 2011

AX5505

 TYPICAL CHARACTERISTICS (CONTINUOUS)

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Rev.1.1 Oct.09 2011

AX5505

 PACKAGE OUTLINES

(1) SOT23-3L

VIEW C

GAUGE PLANE

SEE VIEW C

Symbol

Dimensions in Millimeters

Dimensions in Inches

Min.

Nom.

Max.

Min.

Nom.

Max.

1.45

0.057

0.00

0.08

0.15

0.006

0.90

1.10

1.30

0.035

0.043

0.051

0.30

0.40

0.50

0.012

0.016

0.020

0.08

0.15

0.22

0.003

0.006

0.009

2.70

2.90

3.10

0.106

0.114

0.122

2.60

2.80

3.00

0.102

0.110

0.118

1.40

1.60

1.80

0.055

0.063

0.071

0.30

0.45

0.60

0.012

0.018

0.024

0.50

0.60

0.70

0.020

0.024

0.028

1.9 BSC

0.075 BSC

0.95 BSC

0.037 BSC

JEDEC outline: NA

10/11

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Rev.1.1 Oct.09 2011

AX5505

(2) SOT23-5L

b(5x)

DETAL A

1(4x)

2(4x)

GAUGE PLANE

DETAL A

Symbol

Dimensions in Millimeters

Dimensions in Inches

Min.

Nom.

Max.

Min.

Nom.

Max.

1.45

0.057

0.00

0.08

0.15

0.003

0.006

0.90

1.10

1.30

0.035

0.043

0.051

0.30

0.40

0.50

0.012

0.016

0.020

0.08

0.15

0.22

0.003

0.006

0.009

2.70

2.90

3.10

0.106

0.114

0.122

1.40

1.60

1.80

0.055

0.063

0.071

2.60

2.80

3.00

0.102

0.110

0.118

0.30

0.45

0.60

0.012

0.018

0.024

0.50

0.60

0.70

0.020

0.024

0.028

1.9 BSC

0.075 BSC

0.95 BSC

0.037 BSC

θ1

10o

15o

10o

15o

θ2

10o

15o

10o

15o

JEDEC outline: MO-178 AA

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Rev.1.1 Oct.09 2011

AX5505

(3) SOT89-3L

e1 e

b b

80(2x)

1.7

0.4

0.9

2.7

1.3

1.9

50(2x)

Lead Pattern Recommendation (Unit: mm)

1.5

Symbol

Dimensions in Millimeters

Dimensions in Inches

Min.

Nom.

Max.

Min.

Nom.

Max.

1.40

1.50

1.60

0.055

0.059

0.063

0.36

0.42

0.48

0.014

0.017

0.019

0.44

0.50

0.56

0.017

0.02

0.022

0.35

0.40

0.44

0.014

0.016

0.017

4.40

4.50

4.60

0.173

0.177

0.181

1.35

1.59

1.83

0.053

0.063

0.072

3.0 BSC

0.118 BSC

1.5 BSC

0.059 BSC

2.29

2.45

2.60

0.09

0.097

0.102

3.94

4.10

4.25

0.155

0.161

0.167

0.80

1.00

1.20

0.031

0.04

0.047

JEDEC outline: TO-243 AB

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