LTC3129

1

3129fc

For more information www.linear.com/LTC3129

Typical applicaTion

FeaTures

DescripTion

15V, 200mA Synchronous

Buck-Boost DC/DC Converter

with 1.3µA Quiescent Current

The LTC®3129 is a high efficiency, 200mA buck-boost

an accurate RUN pin threshold to allow predictable regula-

tor turn-on and a maximum power point control (MPPC)

capability that ensures maximum power extraction from

non-ideal power sources such as photovoltaic panels.

The LTC3129 employs an ultralow noise, 1.2MHz PWM

switchingarchitecturethatminimizessolutionfootprintby

allowing the use of tiny, low profile inductors and ceramic

capacitors. Built-in loop compensation and soft-start

simplify the design. For high efficiency operation at light

loads, automatic Burst Mode operation can be selected,

reducing the quiescent current to just 1.3µA.

Additional features include a power good output, less than

10nA of shutdown current and thermal shutdown.

The LTC3129 is available in thermally enhanced 3mm ×

3mm QFN and 16-lead MSOP packages. For fixed output

voltageoptions,seethefunctionallyequivalentLTC3129-1,

which eliminates the need for an external feedback divider.

L

, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks

and PowerPath is a trademark of Linear Technology Corporation. All other trademarks are the

property of their respective owners.

applicaTions

n

n

Start-Up (Bootstrapped)

n

n

200mA Output Current in Buck Mode

n

Single Inductor

n

1.3µA Quiescent Current

n

Programmable Maximum Power Point Control

n

1.2MHz Ultralow Noise PWM

n

Current Mode Control

n

n

Up to 95% Efficiency

n

Accurate RUN Pin Threshold

n

Power Good Indicator

n

10nA Shutdown Current

n

Thermally Enhanced 3mm × 3mm QFN and

16-Lead MSOP Packages

n

Industrial Wireless Sensor Nodes

n

Post-Regulator for Harvested Energy

n

Solar Panel Post-Regulator/Charger

n

Intrinsically Safe Power Supplies

n

Wireless Microphones

n

Avionics-Grade Wireless Headsets

BST1

SW1

SW2

LTC3129

22nF

BST2

PGOOD

GND

FB

2.42V TO 15V

RUN

MPPC

PWM

22nF

10µH

10µF

10µF

10pF

2.2µF

3129 TA01a

PGND

3.32M

1.02M

Efficiency and Power Loss vs Load

100

OUTPUT CURRENT (mA)

0.01

70

80

90

50

30

20

60

40

10

0

1000

100

0.1

10

1

0.01

3129 TA01b

0.1

100

1000

10

1

EFFICIENCY

POWER LOSS