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LTC3112

Description
High Efficiency, Synchronous,4-Switch Buck-Boost Controller
File Size618KB,30 Pages
ManufacturerLinear ( ADI )
Websitehttp://www.analog.com/cn/index.html
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LTC3112 Overview

High Efficiency, Synchronous,4-Switch Buck-Boost Controller

LTC3780
High Efficiency, Synchronous,
4-Switch Buck-Boost Controller
FeaTures
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DescripTion
The
LTC
®
3780
is a high performance buck-boost switch-
ing regulator controller that operates from input voltages
above, below or equal to the output voltage. The constant
frequency current mode architecture allows a phase-
lockable frequency of up to 400kHz. With a wide 4V to
30V (36V maximum) input and output range and seamless
transfers between operating modes, the LTC3780 is ideal
for automotive, telecom and battery-powered systems.
The operating mode of the controller is determined through
the FCB pin. For boost operation, the FCB mode pin can
select among Burst Mode
®
operation, discontinuous mode
and forced continuous mode. During buck operation, the
FCB mode pin can select among skip-cycle mode, discon-
tinuous mode and forced continuous mode. Burst Mode
operation and skip-cycle mode provide high efficiency
operation at light loads while forced continuous mode
and discontinuous mode operate at a constant frequency.
Fault protection is provided by an output overvoltage
comparator and internal foldback current limiting. A power
good output pin indicates when the output is within 7.5%
of its designed set point.
L,
LT, LTC, LTM, Linear Technology, Burst Mode, µModule and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. Patents, including 5481178, 6304066, 5929620, 5408150,
6580258, patent pending on current mode architecture and protection.
Single Inductor Architecture Allows V
IN
Above,
Below or Equal to V
OUT
Wide V
IN
Range: 4V to 36V Operation
Synchronous Rectification: Up to 98% Efficiency
Current Mode Control
±1%
Output Voltage Accuracy: 0.8V < V
OUT
< 30V
Phase-Lockable Fixed Frequency: 200kHz to 400kHz
Power Good Output Voltage Monitor
Internal LDO for MOSFET Supply
Quad N-Channel MOSFET Synchronous Drive
V
OUT
Disconnected from V
IN
During Shutdown
Adjustable Soft-Start Current Ramping
Foldback Output Current Limiting
Selectable Low Current Modes
Output Overvoltage Protection
Available in 24-Lead SSOP and Exposed Pad
(5mm
×
5mm) 32-Lead QFN Packages
applicaTions
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Automotive Systems
Telecom Systems
DC Power Distribution Systems
High Power Battery-Operated Devices
Industrial Control
Typical applicaTion
High Efficiency Buck-Boost Converter
V
IN
5V TO 32V
22µF
50V
CER
+
A
0.1µF
B
4.7µF
V
IN
PGOOD INTV
CC
TG2
BOOST2
SW2
BG2
2200pF
I
TH
0.1µF
SS
LTC3780
TG1
BOOST1
SW1
BG1
PLLIN
RUN
V
OSENSE
7.5k
1%
ON/OFF
0.1µF
1µF
CER
D
100µF
16V
CER
+
330µF
16V
V
OUT
12V
5A
100
95
EFFICIENCY (%)
Efficiency and Power Loss
V
OUT
= 12V, I
LOAD
= 5A
10
9
8
7
6
85
80
75
70
5
4
3
2
1
0
5
10
20
15
V
IN
(V)
25
30
35
0
POWER LOSS (W)
C
90
20k
105k
1%
SGND
FCB
SENSE
+
SENSE
PGND
0.010
3780 TA01b
4.7µH
3780 TA01
3780ff
For more information
www.linear.com/LTC3780
1

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