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Linear Technology Electronic Components Datasheet

LTC3129EMSE Datasheet

200mA Synchronous Buck-Boost DC/DC Converter

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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 VIN and VOUT 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
VIN
10µF
VCC
BST1 SW1
VIN
SW2 BST2
VOUT
LTC3129
RUN
MPPC
PWM
FB
PGOOD
VCC
GND PGND
Efficiency and Power Loss vs Load
5V AT 200mA, VIN > 5V
5V AT 100mA, VIN < 5V
VOUT
10µF
10pF
3.32M
1.02M
2.2µF
3129 TA01a
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
VIN = 2.5V
VIN = 3.6V
0.1
VIN = 5V
VIN = 15V
0.01
10 100 1000
OUTPUT CURRENT (mA)
3129 TA01b
3129fc
For more information www.linear.com/LTC3129
1


Linear Technology Electronic Components Datasheet

LTC3129EMSE Datasheet

200mA Synchronous Buck-Boost DC/DC Converter

No Preview Available !

LTC3129
Absolute Maximum Ratings
(Notes 1, 8)
VIN, VOUT Voltages ..................................... –0.3V to 18V
SW1 DC Voltage............................. –0.3V to (VIN + 0.3V)
SW2 DC Voltage..........................–0.3V to (VOUT + 0.3V)
SW1, SW2 Pulsed (<100ns) Voltage...............–1V to 19V
BST1 Voltage ..................... (SW1 – 0.3V) to (SW1 + 6V)
BST2 Voltage .....................(SW2 – 0.3V) to (SW2 + 6V)
RUN, PGOOD Voltages................................ –0.3V to 18V
VCC, FB, PWM, MPPC Voltages..................... –0.3V to 6V
PGOOD Sink Current ..............................................15mA
Operating Junction Temperature Range
(Notes 2, 5)............................................. –40°C to 125°C
Storage Temperature Range................... –65°C to 150°C
MSE Lead Temperature (Soldering, 10 sec)........... 300°C
Pin Configuration
TOP VIEW
16 15 14 13
BST1 1
VIN 2
VCC 3
RUN 4
17
PGND
12 VOUT
11 PGOOD
10 PWM
9 NC
5678
UD PACKAGE
16-LEAD (3mm × 3mm) PLASTIC QFN
TJMAX = 125°C, θJC = 7.5°C/W, θJA = 68°C/W (NOTE 6)
EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB
VCC 1
RUN 2
MPPC 3
GND 4
FB 5
NC 6
NC 7
PWM 8
TOP VIEW
17
PGND
16 VIN
15 BST1
14 SW1
13 PGND
12 SW2
11 BST2
10 VOUT
9 PGOOD
MSE PACKAGE
16-LEAD PLASTIC MSOP
TJMAX = 125°C, θJC = 10°C/W, θJA = 40°C/W (NOTE 6)
EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3129EUD#PBF
LTC3129EUD#TRPBF LGDR
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LTC3129IUD#PBF
LTC3129IUD#TRPBF
LGDR
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LTC3129EMSE#PBF
LTC3129EMSE#TRPBF 3129
16-Lead Plastic MSOP
–40°C to 125°C
LTC3129IMSE#PBF
LTC3129IMSE#TRPBF 3129
16-Lead Plastic MSOP
–40°C to 125°C
Consult LTC Marketing for parts specified with wider operating temperature ranges.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through
designated sales channels with #TRMPBF suffix.
3129fc
2
For more information www.linear.com/LTC3129


Part Number LTC3129EMSE
Description 200mA Synchronous Buck-Boost DC/DC Converter
Maker Linear
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LTC3129EMSE Datasheet PDF






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