- 您现在的位置：买卖IC网 > PDF目录13126 > LTC3735EUHF#PBF (Linear Technology)IC CTRLR DC/DC 2PH HI EFF 38-QFN PDF资料下载
参数资料
| 型号： | LTC3735EUHF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/32页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR DC/DC 2PH HI EFF 38-QFN |
| 标准包装： | 52 |
| 应用： | 控制器，Intel 移动式 CPU |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 1.71 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 供应商设备封装： | 38-QFN（5x7） |
| 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页当前第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页第26页第27页第28页第29页第30页第31页第32页
LTC3735
APPLICATIONS INFORMATION
? V OUT ≈ ? I RIPPLE ? ESR +
LinearTechnologyApplicationNote77.Assuminginduc-
tors are selected to have same ripple percentage for both
1-phase and 2-phase configurations, Figure 5 shows the
reduction of output ripple current by 2-phase operation.
Not only the ripple amplitude is more than halved, but
the ripple frequency is also doubled. Compared with the
output voltage ripple for 1-phase:
? 1 ?
?
? 8 ? f ? C OUT ?
?V OUT of 2-phase is less than 50% of that of 1-phase, given
the same output capacitor ESRs. Or, to have same ?V OUT
2-phase only need half the number of output capacitors
that are needed in 1-phase.
The output ripple varies with input voltage since ?I L is a
function of input voltage. The output ripple will be less than
±25mV at max V IN with ?I L = 0.4I OUT(MAX) /2 assuming:
C OUT required ESR < 4(R SENSE ) and
C OUT > 1/(16f)(R SENSE )
The LTC3735 employs OPTI-LOOP technique to compen-
sate the switching regulator loop with external components
(through I TH pin). OPTI-LOOP compensation speeds
up regulator’s transient response, minimizes output
capacitance and effectively removes constraints on output
capacitor ESR. It opens a much wider selection of output
capacitor types and a variety of capacitor manufactures are
available for high current, low voltage switching regulators.
50
40
30
Manufacturers such as Nichicon, United Chemicon
and Sanyo should be considered for high performance
through-hole capacitors. The OS-CON semiconductor
dielectric capacitor available from Sanyo has the lowest
(ESR)(size) product of any aluminum electrolytic at a
somewhat higher price. An additional ceramic capacitor
in parallel with OS-CON type capacitors is recommended
to reduce the inductance effects.
In surface mount applications, multiple capacitors may
have to be paralleled to meet the ESR or RMS current
handling requirements of the application. Aluminum elec-
trolytic and dry tantalum capacitors are both available in
surface mount configurations. New special polymer (SP)
surface mount capacitors from Panasonic offer very low
ESR also but have much lower capacitive density per unit
volume. In the case of tantalum, it is critical that the capaci-
tors are surge tested for use in switching power supplies.
Several excellent choices are the AVX TPS, AVX TPSV or the
KEMET T510 series of surface mount tantalums, available
in case heights ranging from 2mm to 4mm. Other capacitor
types include Sanyo OS-CON, POSCAPs, Kemet AO-CAPs,
Nichicon PL series and Sprague 595D series. Consult
the manufacturer for other specific recommendations. A
combination of capacitors will often result in maximizing
performance and minimizing overall cost and size.
PV CC Decoupling
The PV CC pin supplies power to the top and bottom gate
drivers and therefore must be bypassed to power ground
with a minimum of 4.7μF ceramic or tantalum capacitor.
Since the gate driving currents are of high amplitude and
high slew rate, this bypassing capacitor should be placed
very close to the PV CC and PGND pins to minimize the
parasitic inductance. Do NOT apply greater than 7V to
the PV CC pin.
20
10
0
0.1
0.2
0.3 0.4 0.5 0.6 0.7
DUTY FACTOR (V OUT /V IN )
0.8 0.9
3735 F05
The PV CC pin also supplies current to the internal control
circuitry of the LTC3735. This supply current is much
lower than that of the current for the external MOSFET
gate drive. Ceramic capacitors are very good for high
frequency filtering and a 0.1μF ~ 1μF ceramic capacitor
should be placed adjacent to the PV CC and SGND pins.
Figure 5. Output Ripple Current Reduction
of 2-Phase Over Single Phase
3735fa
16
相关PDF资料 |
PDF描述 |
|---|---|
| ISL9012IRCJZ | IC REG LDO 1.8V/2.8V 10-DFN |
| ISL9012IRJRZ | IC REG LDO 2.8V/2.6V 10-DFN |
| EBA49DTBT | CONN EDGECARD 98POS R/A .125 SLD |
| ISL6263CHRZ | IC VOLT REG 1PH 5BIT VID 32-QFN |
| 1945-38J | COIL RF 910UH MOLDED UNSHIELDED |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3736EGN | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3736EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP 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 |
| LTC3736EGN#TR | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3736EGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3736EGN-1 | 功能描述:IC REG CTRLR BUCK PWM CM 24-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:PolyPhase® 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 |
发布紧急采购，3分钟左右您将得到回复。