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Linear Technology Electronic Components Datasheet

LTC3112IDHD Datasheet

2.5A Synchronous Buck-Boost DC/DC Converter

No Preview Available !

FEATURES
n Regulated Output with VIN Above, Below or Equal to VOUT
n 2.7V to 15V Input Voltage Range
n 2.5V to 14V Output Voltage Range
n 2.5A Continuous Output Current: VIN ≥ 5V,
VOUT = 5V, PWM Mode
n Output Current Monitor
n Up to 95% Efficiency
n 750kHz Switching Frequency, Synchronizable
Between 300kHz and 1.5MHz
n Internal N-Channel MOSFETs
n Selectable Burst Mode® Operation, IQ = 50µA
n Shutdown Current < 1µA
n Overvoltage Protection
n Output Disconnect in Shutdown
n Internal Soft-Start
n Small, Thermally Enhanced 16-Lead (4mm × 5mm ×
0.75mm) DFN and 20-Lead TSSOP Package
APPLICATIONS
n 3.3V or 5V from 1, 2 or 3 Li-Ion, Backup Capacitor Stack
n Hand Held Inventory Terminals
n RF Transmitters
n 12V Synchronous Boost Converter
n Multiple Power Input Systems
n LED Lighting with Current Regulation
n 12V Lead Acid Battery to 12V
LTC3112
15V, 2.5A Synchronous
Buck-Boost DC/DC
Converter
DESCRIPTION
The LTC®3112 is a fixed frequency synchronous buck-boost
DC/DC converter with an extended input and output range.
The unique 4-switch, single inductor architecture provides
low noise and seamless operation from input voltages
above, below or equal to the output voltage.
With an input range of 2.7V to 15V, the LTC3112 is well-
suited for a wide variety of single or multiple cell battery,
backup capacitor or wall adapter source applications. Low
RDS(ON) internal N-Channel MOSFET switches provide
highly efficient operation in applications with higher load
current requirements.
The LTC3112 features selectable PWM or Burst Mode
operation, an easily synchronized oscillator and output
disconnect in shutdown. An output current monitor circuit
allows the load current to be controlled or measured. Other
features include <1µA shutdown current, short circuit
protection, soft-start, current limit and thermal shutdown.
The LTC3112 is offered in both a 16-pin (4mm × 5mm ×
0.75mm) DFN and 20-pin TSSOP packages.
L, LT, LTC, LTM, Linear Technology Burst Mode, LTSpice and the Linear logo are registered
trademarks and No RSENSE and PowerPath are trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Protected by U.S. Patents,
including 5481178.
TYPICAL APPLICATION
5V, 750kHz Wide Input Voltage Range Buck-Boost Regulator
4.7µH
0.1µF
2.7V TO 15V
VIN
BURST PWM
10µF
OFF ON
1µF
SW1
SW2
BST1
BST2
VIN
VOUT
VCC LTC3112 COMP
PWM/SYNC
FB
RUN
IOUT
GND
OVP
0.1µF
680pF 33k
22pF
845k
5V/2.5A, VIN > 5V
VOUT
47pF
10k
TO ADC
1V PER AMP
47µF
100pF 42.2k
158k
3112 TA01
For more information www.linear.com/LTC3112
Efficiency at 5VOUT
100
PWM
90
BURST
80
70
60
50
40
30
0.0001 0.001 0.01 0.1
LOAD CURRENT (A)
2.7VIN
5.0VIN
12VIN
1
3112 TA02
3112fd
1


Linear Technology Electronic Components Datasheet

LTC3112IDHD Datasheet

2.5A Synchronous Buck-Boost DC/DC Converter

No Preview Available !

LTC3112
ABSOLUTE MAXIMUM RATINGS
(Notes 1, 3)
VIN Voltage.................................................. – 0.3V to 16V
VOUT Voltage............................................... – 0.3V to 15V
SW1 Voltage (Note 4).................... – 0.3V to (VIN + 0.3V)
SW2 Voltage (Note 4)................. – 0.3V to (VOUT + 0.3V)
VBST1 Voltage.................... (VSW1 – 0.3V) to (VSW1 + 6V)
VBST2 Voltage....................(VSW2 – 0.3V) to (VSW2 + 6V)
RUN Voltage............................................... – 0.3V to 16V
PWM/SYNC, VCC, IOUT Voltage.....................– 0.3V to 6V
FB, COMP, OVP Voltage................................– 0.3V to 6V
Operating Junction Temperature Range (Notes 2, 6)
............................................................... –55°C to 150°C
Storage Temperature Range...................– 65°C to 150°C
Lead Temperature (Soldering, 10sec) TSSOP........ 300°C
PIN CONFIGURATION
TOP VIEW
COMP 1
FB 2
OVP 3
VIN 4
VIN 5
RUN 6
IOUT 7
VOUT 8
16 PWM/SYNC
15 VCC
14 BST1
17
13 SW1
GND
12 SW1
11 BST2
10 SW2
9 SW2
DHD16 PACKAGE
16-LEAD (5mm × 4mm) PLASTIC DFN
TJMAX=150 °C, qJA = 43°C/W, qJC = 4°C/W
EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB
TOP VIEW
GND 1
20 GND
COMP 2
19 PWM/SYNC
FB 3
18 VCC
OVP 4
17 BST1
VIN 5
VIN 6
21
16 SW1
GND
15 SW1
RUN 7
14 BST2
IOUT 8
VOUT 9
13 SW2
12 SW2
GND 10
11 GND
FE PACKAGE
20-LEAD PLASTIC TSSOP
TJMAX = 150°C, qJA = 38°C/W, qJC = 4°C/W
EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION http://www.linear.com/product/LTC3112#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3112EDHD#PBF
LTC3112EDHD#TRPBF 3112
16-Lead (5mm × 4mm) Plastic DFN
–40°C to 125°C
LTC3112IDHD#PBF
LTC3112IDHD#TRPBF 3112
16-Lead (5mm × 4mm) Plastic DFN
–40°C to 125°C
LTC3112HDHD#PBF
LTC3112HDHD#TRPBF 3112
16-Lead (5mm × 4mm) Plastic DFN
–40°C to 150°C
LTC3112MPDHD#PBF
LTC3112MPDHD#TRPBF 3112
16-Lead (5mm × 4mm) Plastic DFN
–55°C to 150°C
LTC3112EFE#PBF
LTC3112EFE#TRPBF
3112FE
20-Lead Plastic TSSOP
–40°C to 125°C
LTC3112IFE#PBF
LTC3112IFE#TRPBF
3112FE
20-Lead Plastic TSSOP
–40°C to 125°C
LTC3112HFE#PBF
LTC3112HFE#TRPBF
3112FE
20-Lead Plastic TSSOP
–40°C to 150°C
LTC3112MPFE#PBF
LTC3112MPFE#TRPBF 3112FE
20-Lead Plastic TSSOP
–55°C to 150°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
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.
3112fd
2
For more information www.linear.com/LTC3112


Part Number LTC3112IDHD
Description 2.5A Synchronous Buck-Boost DC/DC Converter
Maker Linear
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