- 您现在的位置：买卖IC网 > PDF目录4954 > LTC3859EUHF#PBF (Linear Technology)IC REG CTRLR BST PWM CM 38-QFN PDF资料下载
参数资料
| 型号： | LTC3859EUHF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 26/42页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 38-QFN |
| 标准包装： | 52 |
| PWM 型： | 电流模式，Burst Mode? |
| 输出数： | 3 |
| 频率 - 最大： | 850kHz |
| 占空比： | 100% |
| 电源电压： | 4.5 V ~ 38 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 ~ 125°C |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 包装： | 管件 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页第25页当前第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页第37页第38页第39页第40页第41页第42页
LTC3859
APPLICATIONS INFORMATION
V X(MASTER)
V OUT(SLAVE)
V X(MASTER)
V OUT(SLAVE)
TIME
7a. Coincident Tracking
3859 F07a
TIME
7b. Radiometric Tracking
3859 F07b
Figure 7. Two Different Modes of Output Voltage Tracking
V OUT
R B
LTC3859
V FB1,2
at the INTV CC pin from either the V BIAS supply pin or the
EXTV CC pin depending on the connection of the EXTV CC
V X
R A
pin. INTV CC powers the gate drivers and much of the
LTC3859’s internal circuitry. The V BIAS LDO and the EXTV CC
R TRACKB
TRACK/SS1,2
LDO regulate INTV CC to 5.4V. Each of these can supply a
peak current of 50mA and must be bypassed to ground
with a minimum of 4.7μF ceramic capacitor. No matter
V X R A R + R TRACKB
R TRACKA
3859 F08
Figure 8. Using the TRACK/SS Pin for Tracking
Alternatively, the TRACK/SS1 and TRACK/SS2 pins for the
two buck controllers can be used to track two (or more) sup-
plies during start-up, as shown qualitatively in Figures 7a
and 7b. To do this, a resistor divider should be connected
from the master supply (V X ) to the TRACK/SS pin of the
slave supply (V OUT ), as shown in Figure 8. During start-up
V OUT will track V X according to the ratio set by the resis-
tor divider:
= ? TRACKA
V OUT R TRACKA R A + R B
For coincident tracking (V OUT = V X during start-up),
R A = R TRACKA
R B = R TRACKB
INTV CC Regulators
The LTC3859 features two separate internal P-channel
low dropout linear regulators (LDO) that supply power
what type of bulk capacitor is used, an additional 1μF
ceramic capacitor placed directly adjacent to the INTV CC
and PGND IC pins is highly recommended. Good bypassing
is needed to supply the high transient currents required
by the MOSFET gate drivers and to prevent interaction
between the channels.
High input voltage applications in which large MOSFETs
are being driven at high frequencies may cause the
maximum junction temperature rating for the LTC3859 to
be exceeded. The INTV CC current, which is dominated by
the gate charge current, may be supplied by either the V BIAS
LDO or the EXTV CC LDO. When the voltage on the EXTV CC
pin is less than 4.7V, the V BIAS LDO is enabled. Power
dissipation for the IC in this case is highest and is equal to
V BIAS ? I INTVCC . The gate charge current is dependent
on operating frequency as discussed in the Ef?ciency
Considerations section. The junction temperature can be
estimated by using the equations given in Note 2 of the
Electrical Characteristics. For example, the LTC3859 INTV CC
current is limited to less than 40mA from a 40V supply
when not using the EXTV CC supply at a 70°C ambient
temperature in the QFN package:
T J = 70°C + (40mA)(40V)(34°C/W) = 125°C
3859fa
26
相关PDF资料 |
PDF描述 |
|---|---|
| HMC26DRTH-S734 | CONN EDGECARD 52POS DIP .100 SLD |
| 4922-05L | INDUCTOR 2.2UH POWER SMD |
| LTC3728EG#PBF | IC REG CTRLR BUCK PWM CM 28-SSOP |
| HMC26DREN-S734 | CONN EDGECARD 52POS .100 EYELET |
| ECA44DTMT | CONN EDGECARD 88POS R/A .125 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3859IFE#PBF | 功能描述:IC REG CTRLR BST PWM CM 38-TSSOP 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 |
| LTC3859IFE#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 38-TSSOP 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 |
| LTC3859IUHF#PBF | 功能描述:IC REG CTRLR BST PWM CM 38VQFN 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:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 V 降压:无 升压:是 回扫:是 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:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
| LTC3859IUHF#TRPBF | 功能描述:IC REG CTRLR BST PWM CM 38VQFN 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 |
| LTC3860EUH#PBF | 功能描述:IC REG CTRLR BUCK PWM VM 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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 |
发布紧急采购，3分钟左右您将得到回复。