LTC3115-1
40V, 2A Synchronous
Buck-Boost DC/DC
Converter
Fea T Descrip T
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Wide V Range: 2.7V to 40V
The LTC 3115-1 is a high voltage monolithic synchronous
IN
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Wide V Range: 2.7V to 40V
buck-boost DC/DC converter. Its wide 2.7V to 40V input and
OUT
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1A Output Current for V 3.6V, V = 5V
output voltage ranges make it well suited to a wide variety
IN OUT
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2A Output Current in Step-Down Operation
of automotive and industrial applications. A proprietary
for V 6V
low noise switching algorithm optimizes efficiency with
IN
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Programmable Frequency: 100kHz to 2MHz
input voltages that are above, below or even equal to the
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Synchronizable Up to 2MHz with an External Clock
output voltage and ensures seamless transitions between
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Up to 95% Efficiency
operational modes.
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30A No-Load Quiescent Current in Burst Mode
Programmable frequency PWM mode operation provides
Operation
low noise, high efficiency operation and the ability to syn-
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Ultralow Noise Buck-Boost PWM
chronize switching to an external clock. Switching frequen-
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Internal Soft-Start
cies up to 2MHz are supported to allow use of small value in-
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3A Supply Current in Shutdown
ductors for miniaturization of the application circuit. Pin se-
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Programmable Input Undervoltage Lockout
lectable Burst Mode operation reduces standby current and
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Small 4mm 5mm 0.75mm DFN Package
improves light load efficiency which, combined with a 3A
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Thermally Enhanced 20-Lead TSSOP Package
shutdown current, make the LTC3115-1 ideally suited for
battery-powered applications. Additional features include
output disconnect in shutdown, short-circuit protection
a T
and internal soft-start. The LTC3115-1 is available in ther-
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24V/28V Industrial Applications
mally enhanced 16-lead 4mm 5mm 0.75mm DFN and
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Automotive Power Systems
20-lead TSSOP packages.
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Telecom, Servers and Networking Equipment
L, LT, LTC, LTM, Burst Mode, LTspice, Linear Technology and the Linear logo are registered
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FireWire Regulator
trademarks and No R is a trademark of Linear Technology Corporation. All other
SENSE
trademarks are the property of their respective owners. Protected by U.S. Patents including
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Multiple Power Source Supplies
6404251, 6166527 and others pending.
Typical a T
Efficiency vs V
IN
10H
95
I = 0.5A
LOAD
0.1F 0.1F
90
BST1 SW1 SW2 BST2
I = 1A
5V
LOAD
2.7V TO
PV 1A V > 3.6V
PV
IN OUT IN
40V
2A V 6V
4.7F 47F
IN 85
V
IN
33pF
1M
LTC3115-1
3300pF
60.4k
15k
BURST PWM PWM/SYNC VC 80
OFF ON RUN FB
PV
249k
CC 75
RT V
CC
GND PGND
47.5k 4.7F
(OPTIONAL) V = 5V
OUT
70
2 10 40
3115 TA01a
INPUT VOLTAGE (V) 31151 TA01b
31151fb
1
For more information www.linear.com/LTC3115-1
EFFICIENCY (%)
ion pplica
ions pplica
ion uresLTC3115-1
a Te Maxi Mu M r a T (Note 1)
V , PV , PV ........................................ 0.3V to 45V
V ................................................... 0.3V to 6V
IN IN OUT PWM/SYNC
V
Voltage, All Other Pins ................................. 0.3V to 6V
SW1
DC ........................................... 0.3V to (PV + 0.3V)
Operating Junction Temperature Range (Notes 2, 4)
IN
Pulsed (<100ns) ......................1.5V to (PV + 1.5V)
LTC3115E-1/LTC3115I-1 ..................... 40C to 125C
IN
V
LTC3115H-1 ....................................... 40C to 150C
SW2
DC .........................................0.3V to (PV + 0.3V)
LTC3115MP-1 ..................................... 55C to 150C
OUT
Pulsed (<100ns) .................... 1.5V to (PV + 1.5V)
Storage Temperature Range .................. 65C to 150C
OUT
V ............................................. 0.3V to (V + 0.3V)
Lead Temperature (Soldering, 10 sec)
RUN IN
V .....................................V 0.3V to V + 6V
FE......................................................................300C
BST1 SW1 SW1
V .....................................V 0.3V to V + 6V
BST2 SW2 SW2
p in c F T
TOP VIEW
TOP VIEW PGND 1 20 PGND
RUN 2 19 PWM/SYNC
RUN 1 16 PWM/SYNC
SW2 3 18 SW1
SW2 2 15 SW1
PV 4 17 PV
OUT IN
PV 3 14 PV
OUT IN
GND 5 16 BST1
21
GND 4 13 BST1
PGND
PGND
GND 6 15 BST2
17
GND 5 12 BST2
VC 7 14 PV
CC
VC 6 11 PV
CC
FB 8 13 V
IN
FB 7 10 V
IN
RT 9 12 V
CC
RT 8 9 V
CC
PGND 10 11 PGND
DHD PACKAGE
FE PACKAGE
16-LEAD (5mm 4mm) PLASTIC DFN
20-LEAD PLASTIC TSSOP
T = 125C, = 43C/W, = 4.3C/W
JMAX JA JC
T = 150C, = 38C/W, = 10C/W
EXPOSED PAD (PIN 17) IS PGND, MUST BE SOLDERED TO PCB JMAX JA JC
EXPOSED PAD (PIN 21) IS PGND, MUST BE SOLDERED
TO PCB FOR RATED THERMAL PERFORMANCE
o r Der i n F Ma T
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LTC3115EDHD-1#PBF LTC3115EDHD-1#TRPBF 31151 16-Lead (5mm 4mm) Plastic DFN 40C to 125C
LTC3115IDHD-1#PBF LTC3115IDHD-1#TRPBF 31151 16-Lead (5mm 4mm) Plastic DFN 40C to 125C
LTC3115EFE-1#PBF LTC3115EFE-1#TRPBF LTC3115FE-1 20-Lead Plastic TSSOP 40C to 125C
LTC3115IFE-1#PBF LTC3115IFE-1#TRPBF LTC3115FE-1 20-Lead Plastic TSSOP 40C to 125C
LTC3115HFE-1#PBF LTC3115HFE-1#TRPBF LTC3115FE-1 20-Lead Plastic TSSOP 40C to 150C
LTC3115MPFE-1#PBF LTC3115MPFE-1#TRPBF LTC3115FE-1 20-Lead Plastic TSSOP 55C to 150C
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: