LT3495/LT3495B/

LT3495-1/LT3495B-1

1

3495b1b1fa

TYPICAL APPLICATION

FEATURES

APPLICATIONS

DESCRIPTION

650mA/350mA Micropower

Low Noise Boost Converter

with Output Disconnect

boost converters with integrated power switch, feedback

resistor and output disconnect circuitry. The parts control

power delivery by varying both the peak inductor current

and switch off-time. This novel* control scheme results

in low output voltage ripple as well as high efficiency

over a wide load range. For the LT3495/LT3495-1, the

off-time of the switch is not allowed to exceed a fixed

level, guaranteeing the switching frequency stays above

the audio band for the entire load range. The parts feature

a high performance NPN power switch with a 650mA

and 350mA current limit for the LT3495/LT3495B and

LT3495-1/LT3495B-1 respectively. The quiescent current

is a low 60µA, which is further reduced to less than 0.1µA

in shutdown. The internal disconnect circuitry allows the

output voltage to be isolated from the input during shut-

down. An auxiliary reference input (CTRL pin) overrides

the internal 1.235V feedback reference with any lower

value allowing full control of the output voltage during

operation. The LT3495 series are available in a tiny 10-lead

3mm

× 2mm DFN package.

OLED Power Supply from One Li-Ion Cell

n

Low Quiescent Current

60µA in Active Mode

0.1µA in Shutdown Mode

n

Low Noise Control Scheme (Switching Frequency

Always Stays Above Audible Range for LT3495/-1)

n

Integrated Power NPN:

650mA Current Limit (LT3495/B)

350mA Current Limit (LT3495-1/B-1)

n

Integrated Output Disconnect

n

Integrated Output Dimming

n

Wide input range: 2.5V to 16V

n

Wide output range: Up to 40V

n

Integrated feedback resistor

n

Tiny 10-Lead 3mm

× 2mm DFN Package

n

OLED Power

n

Low Noise Power

n

MP3 Player

Output Voltage Ripple

vs Load Current

Efficiency vs Load Current

L

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

All other trademarks are the property of their respective owners. *Patent pending.

LOAD CURRENT (mA)

0.1

50

40

20

30

10

0

1

3495 TA01b

100

10

1.0µF 0603

2.2µF 1206

SW

CAP

SHDN

CTRL

FB

GND

909k

3495 TA01a

LT3495

4.7µF

1µF

10µH

2.2µF

ONE

Li-Ion

CELL

16V

70mA

LOAD CURRENT (mA)

3495 TA01c

90

80

50

60

70

40

400

320

80

160

240

0

0.1

10

100

1

LOAD FROM CAP