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LTC3780EUH Datasheet(PDF) 1 Page - Linear Technology

Part # LTC3780EUH
Description  High Efficiency, Synchronous,4-Switch Buck-Boost Controller
Download  30 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC3780EUH Datasheet(HTML) 1 Page - Linear Technology

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background image
LTC3780
1
3780ff
For more information www.linear.com/LTC3780
Typical applicaTion
FeaTures
applicaTions
DescripTion
High Efficiency, Synchronous,
4-Switch Buck-Boost Controller
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.
Theoperatingmodeofthecontrollerisdeterminedthrough
the FCB pin. For boost operation, the FCB mode pin can
selectamongBurstMode®operation,discontinuousmode
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
comparatorandinternalfoldbackcurrentlimiting.Apower
good output pin indicates when the output is within 7.5%
of its designed set point.
High Efficiency Buck-Boost Converter
n
Single Inductor Architecture Allows VIN Above,
Below or Equal to VOUT
n
Wide VIN Range: 4V to 36V Operation
n
Synchronous Rectification: Up to 98% Efficiency
n
Current Mode Control
n
±1% Output Voltage Accuracy: 0.8V < VOUT < 30V
n
Phase-Lockable Fixed Frequency: 200kHz to 400kHz
n
Power Good Output Voltage Monitor
n
Internal LDO for MOSFET Supply
n
Quad N-Channel MOSFET Synchronous Drive
n
VOUT Disconnected from VIN During Shutdown
n
Adjustable Soft-Start Current Ramping
n
Foldback Output Current Limiting
n
Selectable Low Current Modes
n
Output Overvoltage Protection
n
Available in 24-Lead SSOP and Exposed Pad
(5mm
× 5mm) 32-Lead QFN Packages
n
Automotive Systems
n
Telecom Systems
n
DC Power Distribution Systems
n
High Power Battery-Operated Devices
n
Industrial Control
+
VIN
TG2
0.1µF
0.1µF
BOOST2
SW2
BG2
TG1
BOOST1
SW1
BG1
PLLIN
RUN
VOSENSE
ITH
SS
SGND
FCB
0.010
4.7µF
A
B
D
C
2200pF
1µF
CER
100µF
16V
CER
330µF
16V
ON/OFF
0.1µF
4.7µH
20k
PGOOD
LTC3780
INTVCC
SENSE+ SENSEPGND
7.5k
1%
3780 TA01
105k
1%
22µF
50V
CER
VIN
5V TO 32V
VOUT
12V
5A
+
VIN (V)
0
90
95
100
15
25
3780 TA01b
85
80
5
10
20
30
35
75
70
8
9
10
7
6
5
4
3
2
1
0
Efficiency and Power Loss
VOUT = 12V, ILOAD = 5A
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.


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