Transcript 40V, 2A Buck-Boost Converter - Linear Technology Press Room

Linear Technology Corp.
40V, 2A Buck-Boost Converter
Tony Armstrong
Director of Product Marketing, Power Products
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Why the Need for the LTC3115-1?
1) Regulated Output with Input Above, Below or Equal to VOUT Enables
Continual Operation Even with Wide Input Fluctuations: Example:
Automotive Application with Input Ranging from 3.3V in Cold-Crank to
36V Transient During Load-Dump Scenario, when Output Must Be a
Continuous 5V
2) Operation from 2.7V to 40V is Ideal for Wide Range of Input Power
Sources: From Single/dual/triple-Cell Li-Ion, to USB, FireWire, Wall
Adapter or Automotive Inputs
3) When Well-Regulated Output is Required with a Discharging Energy
Storage Device, i.e. Battery or SuperCapacitor
4) For 5V Output, LTC3115 can Deliver up to 2A when VIN>6V, and 1A
when VIN>3.6
5) Up to 95% Efficiency Maximizes Battery Run-Time and Minimizes
Thermal Constraints
6) Very Low IQ (< 50uA) Preserves Battery Life During Standby/Light Load
Operation
7) Very Simple, Compact Footprint
© 2011 Linear Technology
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LTC3115-1: What Is It?
• 2A Monolithic Synchronous Buck-Boost DC/DC Converter
• Regulated Output with Input Voltage Above, Below
or Equal to the Output Voltage
• Wide VIN Range: 2.7V to 40V
• Wide VOUT Range: 2.7V to 40V
• Low Noise Buck-Boost Architecture (<5mVPK-PK in PWM Mode)
© 2011 Linear Technology
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LTC3115-1: Key Features
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Wide VIN Range: 2.7V to 40V
Wide VOUT Range: 2.7V to 40V
1A Output Current for VIN ≥ 3.6V, VOUT = 5V
2A Output Current in Step-Down Operation for VIN ≥ 6V
Programmable Frequency: 100kHz to 2MHz
Supports Synchronization with an External Clock
Up to 95% Efficiency
50μA Burst ModeR Quiescent Current
Ultralow Noise Buck-Boost PWM
Internal Soft-Start
3μA Supply Current in Shutdown
Programmable Input Undervoltage Lockout
Small 4mm × 5mm × 0.75mm DFN Package or Thermally Enhanced 20-Lead TSSOP
Package
© 2011 Linear Technology
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LTC3115-1: Typical Application Schematic
© 2011 Linear Technology
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LTC3115-1: Efficiency of Typical Application
VOUT=5V
© 2011 Linear Technology
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LTC3115-1: Packages
© 2011 Linear Technology
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How the LTC3115-1 Fits with Our Other
Synchronous Buck-Boost DC/DC Converters
Supplier
Linear Tech
Linear Tech
Linear Tech
Part #
LTC3115-1
LTC3112
LTC3789
Topology
Monolithic
Synch
Buck/Boost
Monolithic
Synch
Buck/Boost
Synch Buck/Boost
Controller
VIN Range
2.7V to 40V
2.7V to 15V
4V to 38V
V OUT Range
2.7V to 40V
2.5V to 14V
0.8V to 38V
91%
91%
92%
2A
2.5A
5A- 4 N-Channel
External FETs
1A
1.5A
5A
500mA
1A
5A
100kHz to 2MHz
750kHz
200kHz to 600kHz
Synchronizable
Yes
Yes
Yes
Max Duty Cycle
100%
100%
100%
Quiescent Current (µA)
50μA
50μA
3mA
5mVPK-PK
10mVPK-PK
5mVPK-PK
50mVPK-PK
70mVPK-PK
n/a
Auto BurstMode
Yes
Yes
n/a
Output Current
Monitor/Control
No
Yes
Control on I/O
Efficiency (VIN=12V,
VOUT=5V@1A)
Output Current
(VIN>6V, VOUT=5V)
Output Current
(VIN=3.6V, VOUT=5V)
Output Current
(VIN=4V, VOUT=12V)
Frequency (MHz)
Output Ripple PK-PK
(12VIN to 5VOUT @ 1A)
Output Ripple PK-PK In
BurstMode
BurstMode Defeat
Inductor Value
COUT Type
Package
© 2011 Linear Technology
Pricing (1K)
Yes
Yes
n/a
10µH
22µF-Cer
4 x 5 DFN-16
TSSOP-20E
$5.35
4.7µH
47µF-Cer
4 x 5 DFN-16
TSSOP-20E
$4.00/$4.15
4.7µH
330µF-Tant
4x5 QFN-28,
SSOP-28
$4.65
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LTC3115-1: Typical Applications
© 2011 Linear Technology
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LTC3115-1: Release Schedule
• Data Sheet:
Now
• Samples:
Now
• Production Release:
November 2011
© 2011 Linear Technology