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| 型号： | LTC3780MPG#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 1/30页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 24-SSOP |
| 标准包装： | 59 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 440kHz |
| 占空比： | 99% |
| 电源电压： | 4 V ~ 36 V |
| 降压： | 是 |
| 升压： | 是 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -55°C ~ 125°C |
| 封装/外壳： | 24-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
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LTC3780
High Efficiency, Synchronous,
4-Switch Buck-Boost Controller
FEATURES
DESCRIPTION
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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
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.
Automotive Systems
Telecom Systems
DC Power Distribution Systems
High Power Battery-Operated Devices
Industrial Control
APPLICATIONS
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TYPICAL APPLICATION
High Efficiency Buck-Boost Converter
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.
V IN
5V TO 32V
22μF
50V
CER
A
+
4.7μF
V IN PGOOD INTV CC
1μF
CER
D
100μF
16V
CER
+
330μF
16V
V OUT
12V
5A
100
Efficiency and Power Loss
V OUT = 12V, I LOAD = 5A
10
0.1μF
TG2
BOOST2
TG1
BOOST1
0.1μF
95
9
8
B
SW2
BG2
LTC3780
SW1
BG1
C
90
7
6
I TH
SS
2200pF
20k
0.1μF
PLLIN
RUN
V OSENSE
SGND FCB
SENSE + SENSE – PGND
ON/OFF
7.5k
1%
105k
1%
85
80
75
5
4
3
2
1
0.010
70
0
5
10
15 20
V IN (V)
25
30
35
0
3780 TA01b
4.7μH
3780 TA01
For more information www.linear.com/LTC3780
3780ff
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