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参数资料
| 型号： | LTC3789EGN#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.1 A SWITCHING CONTROLLER, 710 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封装： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-28 |
| 文件页数： | 4/28页 |
| 文件大小： | 486K |
| 代理商： | LTC3789EGN#PBF |
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LTC3789
12
3789f
Figure 3. Buck Region (VIN >> VOUT)
POWER SWITCH CONTROL
Figure 1 shows a simplified diagram of how the four
power switches are connected to the inductor, VIN, VOUT
and GND. Figure 2 shows the regions of operation for
the LTC3789 as a function of duty cycle, D. The power
switches are properly controlled so the transfer between
regions is continuous.
Buck Region (VIN >> VOUT)
Switch D is always on and switch C is always off in this
region. At the start of every cycle, synchronous switch B
is turned on first. Inductor current is sensed when syn-
chronous switch B is turned on. After the sensed voltage
falls below a reference voltage, which is proportional to
VITH, synchronous switch B is turned off and switch A is
turned on for the remainder of the cycle. Switches A and
B will alternate, behaving like a typical synchronous buck
regulator. The duty cycle of switch A increases until the
maximum duty cycle of the converter reaches DMAX_BUCK,
given by:
DMAX_BUCK = 1
1
12
100% = 91.67%
Figure 3 shows typical buck region waveforms. If VIN
approaches VOUT, the buck-boost region is reached.
operaTion
Figure 1. Simplified Diagram of the Output Switches
Figure 2. Operating Region vs Duty Cycle
TG1
BG1
TG2
BG2
RSENSE
3789 F01
A
B
D
C
L
SW1
SW2
VIN
VOUT
A ON, B OFF
PWM C, D SWITCHES
D ON, C OFF
PWM A, B SWITCHES
FOUR SWITCH PWM
90%
DMAX
OOST
DMIN
BUCK
DMIN
BOOST
DMAX
BUCK
BOOST REGION
BUCK REGION
BUCK/BOOST REGION
3789 F02
SWITCH A
CLOCK
SWITCH B
SWITCH C
SWITCH D
IL
LOW
HIGH
3780 F03
Buck-Boost Region (VIN ≈ VOUT)
When VIN is close to VOUT, the controller enters buck-
boost region. Figure 4 shows the typical waveforms in this
region. At the beginning of a clock cycle, if the controller
starts with B and D on, the controller first operates as a
buck region. When ICMP trips, switch B is turned off, and
switch A is turned on. At 120° clock phase, switch C is
turned on. The LTC3789 starts to operate as a boost until
ICMP trips. Then, switch D is turned on for the remainder
of the clock period. If the controller starts with switches
A and C on, the controller first operates as a boost, until
ICMP trips and switch D is turned on. At 120°, switch B is
turned on, making it operate as a buck. Then, ICMP trips,
turning switch B off and switch A on for the remainder of
the clock period.
Boost Region (VIN << VOUT)
Switch A is always on and synchronous switch B is always
off in the boost region. In every cycle, switch C is turned on
first. Inductor current is sensed when synchronous switch
C is turned on. After the sensed inductor current exceeds
whatthereferencevoltagedemands,whichisproportional
to VITH, switch C is turned off and synchronous switch
D is turned on for the remainder of the cycle. Switches C
and D will alternate, behaving like a typical synchronous
boost regulator.
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| LTC3789EUFD#PBF | 功能描述:IC REG CTRLR BST PWM CM 28-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 |
| LTC3789EUFD#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 28-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 |
| LTC3789IGN#PBF | 功能描述:IC REG CTRLR BST PWM CM 28-SSOP 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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