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Linear Technology Electronic Components Datasheet

LTC3122EDE Datasheet

2.5A Synchronous Step-Up DC/DC Converter

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LTC3122
Features
15V, 2.5A Synchronous
Step-Up DC/DC Converter
with Output Disconnect
Description
n VIN Range: 1.8V to 5.5V, 500mV After Start-Up
n Output Voltage Range: 2.2V to 15V
n 800mA Output Current for VIN = 5V and VOUT = 12V
n Output Disconnects from Input When Shut Down
n Synchronous Rectification: Up to 95% Efficiency
n Inrush Current Limit
n Up to 3MHz Adjustable Switching Frequency
Synchronizable to External Clock
n Selectable Burst Mode® Operation: 25µA IQ
n Output Overvoltage Protection
n Soft-Start
n <1µA IQ in Shutdown
n 12-Lead, 3mm × 4mm × 0.75mm Thermally
Enhanced DFN and MSOP Packages
Applications
n RF Power
n Piezo Actuators
n Small DC Motors
n 12V Analog Rail From Battery, 5V, or Backup Capacitor
L, LT, LTC, LTM, Linear Technology, the Linear logo and Burst Mode are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
The LTC®3122 is a synchronous step-up DC/DC converter
with true output disconnect and inrush current limiting. The
2.5A current limit along with the ability to program output
voltages up to 15V makes the LTC3122 well suited for a
variety of demanding applications. Once started, opera-
tion will continue with inputs down to 500mV, extending
runtime in many applications.
The LTC3122 features output disconnect in shutdown,
dramatically reducing input power drain and enabling
VOUT to completely discharge. Adjustable PWM switching
from 100kHz to 3MHz optimizes applications for highest
efficiency or smallest solution footprint. The oscillator
can also be synchronized to an external clock for noise
sensitive applications. Selectable Burst Mode operation
reduces quiescent current to 25µA, ensuring high efficiency
across the entire load range. An internal soft-start limits
inrush current during start-up.
Other features include a <1µA shutdown current and ro-
bust protection under short-circuit, thermal overload, and
output overvoltage conditions. The LTC3122 is offered in
both a low profile 12-lead (3mm × 4mm × 0.75 mm) DFN
package and a 12-lead thermally enhanced MSOP package.
Typical Application
5V to 12V Synchronous Boost Converter with Output Disconnect
VIN
5V
4.7µF
3.3µH
OFF ON
BURST PWM
SW
VIN
VOUT
LTC3122
SD
PWM/SYNC
CAP
RT
FB
57.6k
VCC
SGND
VC
PGND
4.7µF
100nF
210k
390pF
VOUT
12V
800mA
1.02M
22µF
113k
10pF
3122 TA01a
Efficiency Curve
100
10
90 Burst Mode
OPERATION
80
70
PWM
1
60
50
40
30
0.1
PWM POWER LOSS
20
10
0
0.01
0.01
0.1
1
10 100 1000
LOAD CURRENT (mA)
3122 TA01b
For more information www.linear.com/LTC3122
3122fa
1


Linear Technology Electronic Components Datasheet

LTC3122EDE Datasheet

2.5A Synchronous Step-Up DC/DC Converter

No Preview Available !

LTC3122
Absolute Maximum Ratings
(Note 1)
VIN Voltage ................................................... –0.3V to 6V
VOUT Voltage ............................................. –0.3V to 18V
SW Voltage (Note 2)................................... –0.3V to 18V
SW Voltage (Pulsed < 100ns) (Note 2)........ –0.3V to 19V
VC, RT Voltage ........................................... –0.3V to VCC
CAP Voltage
VOUT < 5.7V.............................–0.3V to (VOUT + 0.3V)
5.7V ≤ VOUT ≤ 11.7V...... (VOUT – 6V) to (VOUT + 0.3V)
VOUT > 11.7V..................................(VOUT – 6V) to 12V
All Other Pins................................................ –0.3V to 6V
Operating Junction Temperature Range (Notes 3, 4)
LTC3122E/LTC3122I........................... –40°C to 125°C
LTC3122H........................................... –40°C to 150°C
Storage Temperature Range................... –65°C to 150°C
MSE Lead Temperature (Soldering, 10sec)............ 300°C
Pin Configuration
TOP VIEW
SW 1
PGND 2
VIN 3
PWM/SYNC 4
VCC 5
RT 6
13
PGND
12 CAP
11 VOUT
10 SGND
9 SD
8 FB
7 VC
DE PACKAGE
12-LEAD (4mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W (NOTE 5), θJC = 5°C/W
EXPOSED PAD (PIN 13) IS PGND,
MUST BE SOLDERED TO PCB FOR RATED THERMAL PERFORMANCE
TOP VIEW
SW 1
PGND 2
VIN 3
PWM/SYNC 4
VCC 5
RT 6
13
PGND
12 CAP
11 VOUT
10 SGND
9 SD
8 FB
7 VC
MSE PACKAGE
12-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 40°C/W (NOTE 5), θJC = 10°C/W
EXPOSED PAD (PIN 13) IS PGND,
MUST BE SOLDERED TO PCB FOR RATED THERMAL PERFORMANCE
Order Information
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3122EDE#PBF
LTC3122EDE#TRPBF
3122
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3122IDE#PBF
LTC3122IDE#TRPBF
3122
12-Lead (4mm × 3mm) Plastic DFN
–40°C to 125°C
LTC3122EMSE#PBF
LTC3122EMSE#TRPBF 3122
12-Lead Plastic MSOP
–40°C to 125°C
LTC3122IMSE#PBF
LTC3122IMSE#TRPBF 3122
12-Lead Plastic MSOP
–40°C to 125°C
LTC3122HMSE#PBF
LTC3122HMSE#TRPBF 3122
12-Lead Plastic MSOP
–40°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/
3122fa
2
For more information www.linear.com/LTC3122


Part Number LTC3122EDE
Description 2.5A Synchronous Step-Up DC/DC Converter
Maker Linear
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