LTC3129-1_15 Datasheet, PDF (1/30 Pages) Linear Technology – 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3A Quiescent Current

LTC3129-1
15V, 200mA Synchronous
Buck-Boost DC/DC Converter
with 1.3µA Quiescent Current
Features
Description
n _{Regulates VOUT Above, Below or Equal to VIN}
n _{Wide VIN Range: 2.42V to 15V, 1.92V to 15V After}
Start-Up (Bootstrapped)
n _{Fixed Output Voltage with Eight User-Selectable}
Settings from 2.5V to 15V
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 _{Pin Selectable Burst Mode}^® _Operation
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
Applications
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}
The LTC^®3129-1 is a high efficiency, 200mA buck-boost
DC/DC converter with a wide V_IN and V_OUT range. It
includes an accurate RUN pin threshold to allow predict-
able regulator 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 LTC3129-1 employs an ultralow noise, 1.2MHz PWM
switching architecture that minimizes solution footprint by
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. To further
reduce part count and improve light load efficiency, the
LTC3129-1 includes an internal voltage divider to provide
eight selectable fixed output voltages.
Additional features include a power good output, less than
10nA of shutdown current and thermal shutdown.
The LTC3129-1 is available in thermally enhanced
3mm × 3mm QFN and 16-lead MSOP packages. For an
adjustable output voltage, see the functionally equivalent
LTC3129.
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
of Linear Technology Corporation. All other trademarks are the property of their respective owners.
Typical Application
22nF _10µH 22nF
V_IN
2.42V TO 15V
AA OR AAA
BATTERIES
10µF
V_CC
BST1 SW1
V_IN
SW2 BST2
V_OUT
LTC3129-1
RUN
V_OUT
5V AT
10µF ^{100mA V}IN ^{< V}OUT
200mA V_IN > V_OUT
MPPC
PGOOD
PWM
VS1
VS2
VS3 _GND
V_CC
PGND
2.2µF
31291 TA01a
Efficiency and Power Loss vs Load
100
1000
90 EFFICIENCY
80
100
70
60
10
50
POWER LOSS
40
1
30
20
10
0 ^{VOUT = 5V}
0.01 0.1
1
V_IN = 2.5V
V_IN = 3.6V
0.1
V_IN = 5V
V_IN = 15V
0.01
10 100 1000
OUTPUT CURRENT (mA)
3129 TA01b
For more information www.linear.com/LTC3129-1
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