LTC3204-3.3/LTC3204-5/

LTC3204B-3.3/LTC3204B-5

1

3204fa

FEATURES

DESCRIPTIO

TYPICAL APPLICATIO

are low noise, constant frequency (1.2MHz) switched ca-

pacitorvoltagedoublers.TheLTC3204-3.3/LTC3204B-3.3

can produce a regulated output voltage of 3.3V

from a minimum input voltage of 1.8V (2 alkaline cells)

whereastheLTC3204-5/LTC3204B-5canproduce5Vfrom

a minimum of 2.7V (Li-Ion battery) input.

operation at light loads to maintain low supply current

whereas LTC3204B-3.3/LTC3204B-5 feature constant

frequencyoperationatanyload.Built-insoft-startcircuitry

preventsexcessiveinrushcurrentduringstart-up.Thermal

shutdown and current-limit circuitry allow the parts to

High switching frequency minimizes overall solution

footprint by allowing the use of tiny ceramic capaci-

tors. In shutdown, the load is disconnected from the

input and the quiescent current is reduced to <1µA. The

LTC3204-3.3/LTC3204-5/LTC3204B-3.3/LTC3204B-5 are

available in a low profile (0.75mm) 6-lead 2mm × 2mm

DFN package.

Low Noise Regulated

Charge Pump in 2 × 2 DFN

■

Fixed 3.3V or 5V Outputs

■

1.8V to 4.5V (LTC3204-3.3/LTC3204B-3.3)

2.7V to 5.5V (LTC3204-5/LTC3204B-5)

■

Output Current:

Up to 150mA (LTC3204-5/LTC3204B-5)

Up to 50mA (LTC3204-3.3/LTC3204B-3.3)

■

(LTC3204-3.3/LTC3204-5)

■

Constant Frequency Operation at All Loads

(LTC3204B-3.3/LTC3204B-5)

■

Low Noise Constant Frequency (1.2MHz) Operation*

■

Built-In Soft-Start Reduces Inrush Current

■

Shutdown Disconnects Load from Input

■

Shutdown Current <1µA

■

Short-Circuit/Thermal Protection

■

Available in Low Profile 6-Lead DFN Package

■

2 AA Cell to 3.3V

■

Li-Ion to 5V

■

USB On-The-Go Devices

■

White LED Drivers

■

Handheld Devices

Output Ripple vs Load Current

Burst Mode is a registered trademark of Linear Technology Corporation.

*Protected by U.S. Patents including 6411531.

APPLICATIO S

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

All other trademarks are the property of their respective owners.

OFF ON

GND

SHDN

LTC3204-5/

LTC3204B-5

2.2

µF

2.2

µF

2.2

µF

5V

2.7V TO 5.5V

3204 TA01a

1, 7

2

3

4

5

6

OUTPUT CURRENT (mA)

0

0

5

10

15

20

30

25

50

75

100

3204 TA01b

125

150

25

OUTPUT CAPACITANCE = 2.2

µF

LTC3204B-5

LTC3204-5