Datasheet A7107E6 Datasheet (AiT)

M

ICROPOWER HIGH EFFICIENCY

STEP-UP DC-DC CONVERTER

A7107

Description Features

The A7107 is a micropower, high efficiency,

and low voltage step-up DC/DC converter

intended for use in battery powered wireless

applications. With the low start-up input

voltage below 1V, the device is suitable for

applications with 1 or 2 AA cells, providing up

to 300mA output current at 3.3V output. The

35µA low quiescent current, zero shutdown

current and high efficiency maintains long

battery lifetime. A switching frequency of

450KHz minimizes solution footprint by

allowing the use of small inductors and

ceramic capacitors. The device is offered in a

low profile (1mm) small 6-lead SOT-23

package.

The current mode PWM design is optimized

for stable and high efficiency operations over

a wide range of load currents. With low

resistance internal MOSFET switches, the

 Low Start-up voltage: 0.85V (typ)

 35µA Quiescent Supply Current in

switch-off mode

 <1µA Shutdown Current

 90% Efficiency

 Excellent load and line regulation

characteristics

 300mA, 350mΩ Internal MOSFET

 450KHz Fixed Switching Frequency

 Small SOT-26 package

Application

 Wireless key board and mouse

 MP3 Player, PDA, DSC

 LCD Panel

 RF-Tags

 Portable Equipment

Typical Application

A7107 maintains high efficiency over a wide

range of load current. In addition to its high

efficiency at moderate and heavy loads, the

A7107 includes automatic PFM operation that

improves efficiency of the power converter at

light loads.

Ordering Information

E6

SOT-26 PN: A7107E6

AiT provides all lead free parts Note

AiT provides E6 in Tape & Reel

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ICROPOWER HIGH EFFICIENCY

STEP-UP DC-DC CONVERTER

A7107

Pin Description

Top View

Pin No.

1 CE

2 EXT Output pin for driving external NMOS

3 GND Ground

4 LX Pin for switching

5 VDD Input positive power pin

6 FB

Description Pin Function

Chip enable

A7107 gets into shutdown mode when CE pin set to low

Feedback input pin

Internal reference voltage for the error amplifier is 1.25V

Absolute Maximum Ratings

Parameter

Supply Voltage -0.3V~6V

LX Pin Switch Voltage -0.3V~6V

Other I/O Pin Voltage -0.3V ~ (VDD+0.3V)

LX Pin Switch Current 2.5A

EXT Pin Driver Current 150mA

Operating Junction Temperature (note1) +125oC

Storage Temperature Range -65oC ~ +155oC

Note1: TJ is caculated from the ambient temperature TA and power dissipation PD according to the following

formula:

DAJ

°×+=

)/220( WCPTT

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ICROPOWER HIGH EFFICIENCY

STEP-UP DC-DC CONVERTER

A7107

Electrical Characteristics

VIN=1.5V, V

Start-Up Voltage IL=1mA 0.85 1.05

Operating V

Quiescent Current (Shutdown Current) CE Pin=0V, VIN=4.5V 0.01 1 uA

Quiescent Current (Switch-Off Current) VIN=6V 35 50 uA

Quiescent current (No Load Current) 110 uA

Feedback Reference Voltage

Switching Frequency 380 450 520 KHz

Maximum Duty 85 90 %

=3.3V, IL=0mA, TA=25oC, unless otherwise noted.

OUT

Parameter Conditions Min Typ Max

Range VDD Pin Voltage 2 4.2 V

OUT

TA = +25°C 1.195 1.220 1.245

TA= 0°C ≤ TA ≤ 85°C 1.190 1.220 1.250

= -40°C ≤ TA ≤ 85°C 1.183 1.220 1.257

T

A

Unit

V

V

V

V

LX ON Resistance 0.3 1.1 Ω

Current Limit Setting 2 A

EXT ON Resistance to VDD 16 Ω

EXT ON Resistance to GND 18 Ω

Output Voltage

Output Voltage

Line Regulation

Load Regulation

Load Regulation VIN = 3.0, IL = 1 to 300mA

CE Pin Trip Level 0.4 0.8 1.2 V

Temperature Stability for V

Thermal Shutdown 165

Thermal Shutdown Hysteresis 10

110 ppm/oC

OUT

VIN=1.5V, IL = 100mA

TA= -40°C ≤ TA ≤ 85°C

VIN=3.0V, IL = 300mA

TA= -40°C ≤ TA ≤ 85°C

VIN = 1.0 to 3.0V,

IL = 1mA

VIN = 1.5V,

IL = 1 to 100mA

3.200 3.300 3.400

3.200 3.300 3.400

0.3 mV/V

0.4 mV/mA

0.4 mV/mA

V

V

o

C

o

C

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Output Current (m A)

Efficiency vs. Output Current, Vout = 3.3V

Output Current (m A)

Efficiency vs. Output Current, Vout = 2.5V

Tem perature [C]

VDD Pin Voltage (V)

Output Current (m A)

Input Voltage (V)

M

ICROPOWER HIGH EFFICIENCY

STEP-UP DC-DC CONVERTER

A7107

Typical Characteristics

VIN=1.5V, V

Efficiency (%)

3.2175

3.2125

3.2075

3.2025

3.1975

Output Voltage (V)

3.1925

=3.3V, IL=0mA, TA=25oC, unless otherwise noted.

OUT

100%

96%
92%
88%
84%
80%
76%
72%
68%
64%
60%
56%
52%
48%

Vout = 3.3V, TA = 25C

44%
40%

0.5 1 10 1 00 1000

Output Voltage vs. T emperature

3.215

3.21

3.205

3.2

3.195

3.19
30 36 42 4 8 54 60 66 72 78 8 4 90

VIN = 3.0v
VIN = 2.5v
VIN = 2.0v
VIN = 1.5v
VIN = 1.0V

100%

96%
92%
88%
84%
80%
76%
72%
68%
64%
60%

Efficiency (%)

56%
52%
48%

Vout = 2.5V, TA = 25C

44%
40%

0.5 1 10 1 00 1000

Switching Frequency vs. Pin Voltage

600

500

400

300

200

Switching Frequency (kHz)

100

0 1 2 3 4 5 6

VIN = 2V
VIN = 1.5V
VIN = 1V

Start Up Voltage vs. Output Current

1.8

1.6

1.4

1.2

1

0.8

0.6

Start Up Voltage (V)

0.4

0.2

0

0 20 40 60 80 100 12 0 140

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(In C.R. Mode)

Supply Currnet I(Vin) vs. Input Voltage

128

120

112

104

96

88

80

72

64

Supply Current(uA)

56

48

40

1.5 1.8 2.1 2.4 2.7 3

Vout = 3.3V @ No load

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ICROPOWER HIGH EFFICIENCY

STEP-UP DC-DC CONVERTER

A7107

LX Pin Wave Form & Output Ripple LX Pin Wave Form & Output Ripple

VOUT 20mV/div

LX 2V/div

Vin = 1V, Vout = 3.3V @ 100mA

LX Pin Wave Form & Output Ripple LX Pin Wave Form & Output Ripple

VOUT 20mV/div

VIN=1V, VOUT=3.3V @10mA

VOUT 20mV/div

LX 2V/div

VOUT 20mV/div

LX 2V/div

VIN=2V, VOUT = 3.3V @ 200mA

LX Pin Wave Form & Output Ripple LX Pin Wave Form & Output Ripple

VOUT 20mV/div

LX 2V/div

VIN=3V, VOUT=3.3v @ 200mA

VIN=2V, VOUT3.3V @ 10mA

VIN=3V, VOUT=3.3v @ 10mA

LX 2V/div

VOUT 20mV/div

LX 2V/div

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STEP-UP DC-DC CONVERTER

A7107

Block Diagram

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ICROPOWER HIGH EFFICIENCY

STEP-UP DC-DC CONVERTER

A7107

Package Information

Dimension in SOT-26 (Unit: mm)

Dimension Min. Max.

A 0.90 1.10

A1 0.01 0.13

B 0.30 0.50

C 0.09 0.20

D 2.80 3.10

H 2.50 3.10

E 1.50 1.70

e 0.95 REF.

e1 1.90 REF.

L1 0.20 0.55

L 0.35 0.80

Q 0º 10º

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ICROPOWER HIGH EFFICIENCY

STEP-UP DC-DC CONVERTER

A7107

IMPORTANT NOTICE

Advanced Innovation Technology Corp. (AiT) reserves the right to make changes to any its

product, specifications, to discountinue any integrated circuit product or service without

notice, and advises its customers to obtain the latest version of relevant information to verify,

before placing orders, that the information being relied on is current.

Advanced Innovation Technology Corp.'s integrated circuit products are not designed,

intended, authorized, or warranted to be suitable for use in life support applications, devices

or systems or other critical applications. Use of AiT products in such applications is

understood to be fully at the risk of the customer. As used herein may involve potential

risks of death, personal injury, or servere property, or environmental damage. In order to

minimize risks associated with the customer's applications, the customer should provide

adequate design and operating safeguards.

Advanced Innovation Technology Corp. assumes to no liability to customer product design

or application support. AiT warrants the performance of its products of the specifications

applicable at the time of sale.

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