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Linear Technology Electronic Components Datasheet

LTC3124 Datasheet

5A 2-Phase Synchronous Step-Up DC/DC Converter

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LTC3124
15V, 5A 2-Phase Synchronous
Step-Up DC/DC Converter with
Output Disconnect
FEATURES
n VIN Range: 1.8V to 5.5V, 500mV After Start-Up
n Adjustable Output Voltage: 2.5V to 15V
n 1.5A Output Current for VIN = 5V and VOUT = 12V
n Dual-Phase Control Reduces Output Voltage Ripple
n Output Disconnects from Input When Shut Down
n Synchronous Rectification: Up to 95% Efficiency
n Inrush Current Limit
n Up to 3MHz Programmable Switching Frequency
Synchronizable to External Clock
n Selectable Burst Mode® Operation: 25µA IQ
n Output Overvoltage Protection
n Internal Soft-Start
n <1µA IQ in Shutdown
n 16-Lead, Thermally- Enhanced 3mm × 5mm ×
0.75mm DFN and TSSOP Packages
APPLICATIONS
n RF, Microwave Power Amplifiers
n Piezo Actuators
n Small DC Motors, Thermal Printers
n 12V Analog Rail from Battery, 5V, or Backup Capacitor
L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks
and ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
DESCRIPTION
The LTC®3124 is a dual-phase, synchronous step-up DC/
DC converter with true output disconnect and inrush
current limiting capable of providing output voltages up
to 15V. Dual-phase operation significantly reduces peak
inductor and capacitor ripple currents, minimizing induc-
tor and capacitor size. The 2.5A per phase current limit,
along with the ability to program output voltages up to 15V
make the LTC3124 well suited for a variety of demanding
applications. Once started, operation will continue with
inputs down to 500mV.
The LTC3124 switching frequency can be programmed
from 100kHz to 3MHz to optimize applications for highest
efficiency or smallest solution footprint. The oscillator can
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 robust
protection under short-circuit,thermal overload,and output
overvoltage conditions. The LTC3124 is offered in both
16-lead DFN and thermally-enhanced TSSOP packages.
TYPICAL APPLICATION
5V to 12V Synchronous Boost Converter
VIN
5V
4.7µH
SWB CAP
100nF
VOUT
4.7µH
PGNDB
SWA
VOUTB
VOUTA
22µF
×2
12V
1.5A
LTC3124
PGNDA
VIN SGND
BURST PWM
10µF
4.7µF
PWM/SYNC
VCC
RT
28k
SD
FB
VC
OFF ON
84.5k
680pF
1.02M
113k
56pF
3124 TA01a
Efficiency Curve
100
90
Burst Mode
OPERATION
80
10
1
70 PWM
60
0.1
50
40
30
20
10
0
0.01
Burst Mode
OPERATION
0.01
PWM
fSW = 1MHz 0.001
EFFICIENCY
POWER LOSS
0.0001
0.1 1 10 100 1000
LOAD CURRENT (mA)
3124 TA01b
For more information www.linear.com/LTC3124
3124f
1


Linear Technology Electronic Components Datasheet

LTC3124 Datasheet

5A 2-Phase Synchronous Step-Up DC/DC Converter

No Preview Available !

LTC3124
ABSOLUTE MAXIMUM RATINGS (Note 1)
VIN Voltage.................................................... –0.3V to 6V
VOUTA, VOUTB Voltages................................ –0.3V to 18V
SWA, SWB Voltages (Note 2)...................... –0.3V to 18V
SWA, SWB (Pulsed < 100ns) (Note 2)........ –0.3V to 19V
VC Voltage...................................................–0.3V to VCC
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)
LTC3124E/LTC3124I............................ –40°C to 125°C
LTC3124H........................................... –40°C to 150°C
Storage Temperature Range................... –65°C to 150°C
Lead Temperature (Soldering, 10 sec)
FE Package Only................................................ 300°C
PIN CONFIGURATION
TOP VIEW
SWB 1
PGNDB 2
SWA 3
PGNDA 4
VIN 5
PWM/SYNC 6
VCC 7
RT 8
17
PGND
16 CAP
15 VOUTB
14 NC
13 VOUTA
12 SGND
11 SD
10 FB
9 VC
DHC PACKAGE
16-LEAD (5mm × 3mm) PLASTIC DFN
TJMAX = 125°C, θJA = 43°C/W (NOTE 5), θJC = 5°C/W
EXPOSED PAD (PIN 17) IS PGND AND MUST BE SOLDERED TO PCB
FOR RATED THERMAL PERFORMANCE
TOP VIEW
SWB
PGNDB
SWA
PGNDA
VIN
PWM/SYNC
VCC
RT
1
2
3
4
5
6
7
8
17
PGND
16 CAP
15 VOUTB
14 NC
13 VOUTA
12 SGND
11 SD
10 FB
9 VC
FE PACKAGE
16-LEAD PLASTIC TSSOP
TJMAX = 150°C, θJA = 40°C/W (NOTE 5), θJC = 10°C/W
EXPOSED PAD (PIN 17) IS PGND AND MUST BE SOLDERED TO PCB
FOR RATED THERMAL PERFORMANCE
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
TEMPERATURE RANGE
LTC3124EDHC#PBF
LTC3124IDHC#PBF
LTC3124EFE#PBF
LTC3124EDHC#TRPBF
LTC3124IDHC#TRPBF
LTC3124EFE#TRPBF
3124
3124
3124FE
16-Lead (5mm × 3mm) Plastic DFN
16-Lead (5mm × 3mm) Plastic DFN
16-Lead Plastic TSSOP
–40°C to 125°C
–40°C to 125°C
–40°C to 125°C
LTC3124IFE#PBF
LTC3124IFE#TRPBF
3124FE
16-Lead Plastic TSSOP
–40°C to 125°C
LTC3124HFE#PBF
LTC3124HFE#TRPBF
3124FE
16-Lead Plastic TSSOP
–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/
3124f
2 For more information www.linear.com/LTC3124


Part Number LTC3124
Description 5A 2-Phase Synchronous Step-Up DC/DC Converter
Maker Linear Technology
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LTC3124 Datasheet PDF






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