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参数资料
| 型号： | LTC3789EUFD#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, PQCC28 |
| 封装： | 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28 |
| 文件页数： | 17/28页 |
| 文件大小： | 486K |
| 代理商： | LTC3789EUFD#PBF |
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LTC3789
24
3789f
Use planes for VIN and VOUT to maintain good voltage
filtering and to keep power losses low.
Floodallunusedareasonalllayerswithcopper.Flooding
with copper will reduce the temperature rise of power
components. Connect the copper areas to any DC
net (VIN or GND). When laying out the printed circuit
board, the following checklist should be used to ensure
proper operation of the LTC3789. These items are also
illustrated in Figure 13.
Segregate the signal and power grounds. All small-
signal components should return to the SGND pin at
one point, which is then tied to the PGND pin close to
the inductor current sense resistor RSENSE.
Place switch B and switch C as close to the controller
as possible, keeping the PGND, BG and SW traces
short.
Keep the high dV/dT SW1, SW2, BOOST1, BOOST2,
TG1 and TG2 nodes away from sensitive small-signal
nodes.
The path formed by switch A, switch B, D1 and the CIN
capacitor should have short leads and PC trace lengths.
The path formed by switch C, switch D, D2 and the
COUT capacitor also should have short leads and PC
trace lengths.
The output capacitor (–) terminals should be connected
as closely as possible to the (–) terminals of the input
capacitor.
Connect the top driver boost capacitor CA closely to the
BOOST1 and SW1 pins. Connect the top driver boost
capacitor CB closely to the BOOST2 and SW2 pins.
Connect the input capacitors CIN and output capacitors
COUT closely to the power MOSFETs. These capacitors
carry the MOSFET AC current in the boost and buck
region.
Connect VFB pin resistive dividers to the (+) terminals of
COUT and signal ground. A small VFB bypass capacitor
may be connected closely to the LTC3789 SGND pin.
The R2 connection should not be along the high current
or noise paths, such as the input capacitors.
Route SENSE– and SENSE+ leads together with mini-
mum PC trace spacing. Avoid having sense lines pass
through noisy areas, such as switch nodes. The filter
capacitor between SENSE+ and SENSE– should be as
close as possible to the IC. Ensure accurate current
sensing with Kelvin connections at the SENSE resistor.
One layout example is shown in Figure 14.
Connect the ITH pin compensation network closely to
the IC, between ITH and the signal ground pins. The
capacitor helps to filter the effects of PCB noise and
output voltage ripple voltage from the compensa-
tion loop.
Connect the INTVCC bypass capacitor, CVCC, closely
to the IC, between the INTVCC and the power ground
pins.ThiscapacitorcarriestheMOSFETdrivers’current
peaks. An additional 1F ceramic capacitor placed im-
mediately next to the INTVCC and PGND pins can help
improve noise performance substantially.
applicaTions inForMaTion
GND
VOUT
COUT
L
RSENSE
3789 F12
QD
QC
QB
QA
SW2
SW1
D1
D2
VIN
CIN
LTC3789
CKT
Figure 12. Switches Layout
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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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