LT3495/LT3495B/

LT3495-1/LT3495B-1

1

3495b1b1f

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 0.1μA in shut-

down. The internal disconnect circuitry allows the output

voltage to be isolated from the input during shutdown. 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

60μA in Active Mode

0.1μA in Shutdown Mode

Always Stays Above Audible Range for LT3495/-1)

650mA Current Limit (LT3495/B)

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

× 2mm DFN Package

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

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