参数资料
| 型号： | LTC3780EG#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/30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： | -40°C ~ 85°C |
| 封装/外壳： | 24-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
| 产品目录页面： | 1336 (CN2011-ZH PDF) |
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LTC3780
OPERATION
CLOCK
of the cycle. switches C and D will alternate, behaving like
a typical synchronous boost regulator.
SWITCH A
SWITCH B
SWITCH C
0V
The duty cycle of switch C decreases until the minimum duty
cycle of the converter in boost mode reaches D MIN_BOOST ,
given by:
SWITCH D
I L
CLOCK
SWITCH A
SWITCH B
SWITCH C
SWITCH D
I L
Figure 3. Buck Mode (V IN > V OUT )
HIGH
3780 F03
D MIN_BOOST = D BUCK-BOOST
where D BUCK-BOOST is the duty cycle of the buck-boost
switch range:
D BUCK-BOOST = (200ns ? f) ? 100%
and f is the operating frequency in Hz.
Figure 5 shows typical boost mode waveforms. If V IN ap-
proaches V OUT , the buck-boost region is reached.
CLOCK
HIGH
SWITCH A
0V
SWITCH B
(4a) Buck-Boost Mode (V IN ≥ V OUT )
3780 F04a
SWITCH C
SWITCH D
CLOCK
SWITCH A
SWITCH B
I L
Figure 5. Boost Mode (V IN < V OUT )
LOW CURRENT OPERATION
3780 F05
SWITCH C
SWITCH D
I L
3780 F04b
The FCB pin is used to select among three modes for both
buck and boost operations by accepting a logic input.
Figure 6 shows the different modes.
(4b) Buck-Boost Mode (V IN ≤ V OUT )
Figure 4. Buck-Boost Mode
FCB PIN
0V to 0.75V
0.85V to 5V
BUCK MODE
Force Continuous Mode
Skip-Cycle Mode
BOOST MODE
Force Continuous Mode
Burst Mode Operation
on, switches B and D are then turned on. Finally, switches
A and D are turned on for the remainder of the time.
>5.3V
DCM with Constant Freq DCM with Constant Freq
Figure 6. Different Operating Modes
Boost Region (V IN < V OUT )
Switch A is always on and synchronous switch B is always
off in boost mode. Every cycle, switch C is turned on first.
Inductor current is sensed when switch C is turned on.
After the sensed inductor current exceeds the reference
voltage which is proportional to V ITH , switch C is turned off
and synchronous switch D is turned on for the remainder
When the FCB pin voltage is lower than 0.8V, the controller
behaves as a continuous, PWM current mode synchronous
switching regulator. In boost mode, switch A is always on.
switch C and synchronous switch D are alternately turned
on to maintain the output voltage independent of direction
of inductor current. Every ten cycles, switch A is forced off
for about 300ns to allow boost capacitor C A (Figure 13) to
recharge. In buck mode, synchronous switch D is always
3780ff
14
For more information www.linear.com/LTC3780
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| LTC3780EUH | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Synchronous Boost/Buck Controller 4V to 36V Input 32-Pin QFN EP |
| LTC3780EUH#PBF | 功能描述:IC REG CTRLR BST PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LTC3780EUH#PBF | 制造商:Linear Technology 功能描述:DC/DC Converter IC |
| LTC3780EUH#TR | 制造商:Linear Technology 功能描述:DC DC Cntrlr Dual-OUT Synchronous Boost/Buck Controller 4V to 36V Input 32-Pin QFN EP T/R |
| LTC3780EUH#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
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