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Linear Technology Electronic Components Datasheet

LTC3129IUD-1 Datasheet

200mA Synchronous Buck-Boost DC/DC Converter

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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 VIN and VOUT 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
VIN
2.42V TO 15V
AA OR AAA
BATTERIES
10µF
VCC
BST1 SW1
VIN
SW2 BST2
VOUT
LTC3129-1
RUN
VOUT
5V AT
10µF 100mA VIN < VOUT
200mA VIN > VOUT
MPPC
PGOOD
PWM
VS1
VS2
VS3 GND
VCC
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
VIN = 2.5V
VIN = 3.6V
0.1
VIN = 5V
VIN = 15V
0.01
10 100 1000
OUTPUT CURRENT (mA)
3129 TA01b
For more information www.linear.com/LTC3129-1
31291fc
1


Linear Technology Electronic Components Datasheet

LTC3129IUD-1 Datasheet

200mA Synchronous Buck-Boost DC/DC Converter

No Preview Available !

LTC3129-1
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 Voltage.................................. –0.3V to 18V
VCC, PWM, MPPC, VS1, VS2,
VS3 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 VS1
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
VS3 5
VS2 6
VS1 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-1#PBF
LTC3129EUD-1#TRPBF LGDS
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LTC3129IUD-1#PBF
LTC3129IUD-1#TRPBF LGDS
16-Lead (3mm × 3mm) Plastic QFN
–40°C to 125°C
LTC3129EMSE-1#PBF
LTC3129EMSE-1#TRPBF 31291
16-Lead Plastic MSOP
–40°C to 125°C
LTC3129IMSE-1#PBF
LTC3129IMSE-1#TRPBF 31291
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.
31291fc
2
For more information www.linear.com/LTC3129-1


Part Number LTC3129IUD-1
Description 200mA Synchronous Buck-Boost DC/DC Converter
Maker Linear
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