LTC3129_15 Datasheet, PDF (1/30 Pages) Linear Technology – 15V, 200mA Synchronous Buck-Boost DC/DC Converter with 1.3A Quiescent Current

LTC3129
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 _{Wide VOUT Range: 1.4V to 15.75V}
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 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 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
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.
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
voltage options, see the functionally equivalent LTC3129-1,
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.
TYPICAL APPLICATION
22nF _10µH 22nF
2.42V TO 15V
V_IN
10µF
V_CC
BST1 SW1
V_IN
SW2 BST2
V_OUT
LTC3129
RUN
MPPC
PWM
FB
PGOOD
V_CC
GND PGND
5V AT 200mA, V_IN > 5V
5V AT 100mA, V_IN < 5V
V_OUT
10µF
10pF
3.32M
1.02M
2.2µF
3129 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
3129fb
For more information www.linear.com/LTC3129
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