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参数资料
| 型号： | LTC3789EUFD#TRPBF |
| 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, PQCC28 |
| 封装： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28 |
| 文件页数： | 7/28页 |
| 文件大小： | 486K |
| 代理商： | LTC3789EUFD#TRPBF |
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LTC3789
15
3789f
applicaTions inForMaTion
The Typical Application on the first page is a basic
LTC3789 application circuit. External component selec-
tion is driven by the load requirement, and begins with
the selection of RSENSE and the inductor value. Next, the
power MOSFETs are selected. Finally, CIN and COUT are
selected. This circuit can be configured for operation up
to an input voltage of 38V.
RSENSE Selection and Maximum Output Current
RSENSE is chosen based on the required output current.
The current comparator threshold sets the peak of the
inductor current in the boost region and the maximum
inductor valley current in the buck region. In the boost
region, the maximum average load current at VIN(MIN) is:
IOUT(MAX,BOOST) =
140mV
RSENSE
–
IL
2
VIN(MIN)
VOUT
where IL is peak-to-peak inductor ripple current. In the
buck region, the maximum average load current is:
IOUT(MAX,BUCK) =
90mV
RSENSE
+
IL
2
Figure 6 shows how the load current (ILOAD(MAX)RSENSE)
varies with input and output voltage.
The maximum current sensing RSENSE value for the boost
region is:
RSENSE(MAX) =
2 140mV VIN(MIN)
2 IOUT(MAX,BOOST) VOUT + IL,BOOST VIN(MIN)
The maximum current sensing RSENSE value for the buck
region is:
RSENSE(MAX) =
2 90mV
2 IOUT(MAX,BUCK) – IL,BUCK
The final RSENSE value should be lower than the calculated
RSENSE(MAX) in both the boost and buck regions. A 20%
to 30% margin is usually recommended.
Programming Input/Output Current Limit
AsshowninFigures7and8,currentsenseresistorRSENSE2
should be placed between the buck capacitor for VIN/VOUT
andthedecouplingcapacitor.AlowpassfilterformedbyRF
andCFisrecommendedtoreducetheswitchingnoise.The
input/output current limit is set by the ILIM pin for 50mV,
100mV or 140mV with ILIM pulled to the GND, floating, or
tied to INTVCC, respectively. If input/output current limit
is not desired, the IOSENSE+ and IOSENSE– pins should be
shorted to either VOUT or VIN.
Figure 6. Load Current vs VIN/VOUT
VIN/VOUT (V)
0.1
90
100
I LOAD(MAX)
R
SENSE
(mV)
110
120
130
140
160
1
10
3789 F06
150
Figure 7. Programming Output Current Limit
Figure 8. Programming Input Current Limit
LTC3789
FROM
CONTROLLER
VOUT
TO
SYSTEM
VOUT
IOSENSE–
RSENSE2
IOSENSE+
RF
100
RF
100
CF
3789 F07
1
2
+
LTC3789
FROM DC
POWER INPUT
TO REMAINDER
OF SYSTEM
IOSENSE–
RSENSE2
IOSENSE+
RF
100
RF
100
CF
3789 F08
1
2
+
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LTC3789IGN#TRPBF | 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 |
| LTC3789IUFD#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 |
| LTC3789IUFD#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 |
| LTC3789IUFDPBF | 制造商:Linear Technology 功能描述:4-Switch Buck-Boost Controller QFN28EP |
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