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参数资料
| 型号： | LTC3811EUHF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/48页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 38-QFN |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 850kHz |
| 占空比： | 90% |
| 电源电压： | 4.5 V ~ 30 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 ~ 85°C |
| 封装/外壳： | 38-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3811
ELECTRICAL CHARACTERISTICS The ● denotes the speci?cations which apply over the full operating
junction temperature range, otherwise speci?cations are at T J = 25°C. V IN = 12V, MODE/SYNC = 0V, unless otherwise speci?ed.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
DRV CC Linear Regulator
V DRVCC
Δ V DRVCC(LOAD)
Δ V DRVCC(LINE)
LDO Regulator Output Voltage
DRV CC Load Regulation
DRV CC Line Regulation
V EXTVCC = 0V
I LOAD = 0mA to 50mA
Δ V IN = 8.5V to 30V
●
5.6
–2.0
6.0
–0.5
0.01
6.4
0.2
V
%
%/V
V DRVCC(UVLO)
V DRVCC(HYST)
V EXTVCC
V EXTVCC(HYST)
V EXTVCC(DROP)
LDO Regulator Undervoltage Threshold
LDO Regulator Undervoltage Hysteresis
EXTV CC Switchover Voltage
EXTV CC Switchover Hysteresis
EXTV CC Voltage Drop
DRV CC Rising
I DRVCC = 20mA, EXTV CC Rising
I DRVCC = 20mA
I DRVCC = 20mA, V EXTVCC = 5V
3.7
0.56
4.5
400
100
V
V
V
mV
mV
Gate Drivers
t r (TG1, TG2)
t f (TG1, TG2)
t r (BG1, BG2)
t f (BG1, BG2)
R DS(ON)(TG)
Top Gate Rise Time
Top Gate Fall Time
Bottom Gate Rise Time
Bottom Gate Fall Time
Top Gate Pull-Down NMOS
C L = 3300pF (Note 6)
C L = 3300pF (Note 6)
C L = 3300pF (Note 6)
C L = 3300pF (Note 6)
TG to SW
20
10
20
10
0.9
ns
ns
ns
ns
Ω
TG1, TG2
On-Resistance
R DS(ON)(BG)
Bottom Gate Pull-Down NMOS
BG to PGND
0.9
Ω
BG1, BG2
On-Resistance
I PK(TG) TG1, TG2
I PK(BG) BG1, BG2
Top Gate (TG) Peak Source Current
Bottom Gate (BG) Peak Source Current
1.0
1.0
A
A
t DEAD1
Bottom Gate Off to Top Gate On
(Note 6)
30
ns
Deadtime
t DEAD2
Top Gate Off to Bottom Gate On
(Note 6)
30
ns
Deadtime
t ON(MIN)
Minimum On-Time
V COMP = 1.25V (Note 6, 7)
65
ns
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime. Unless otherwise speci?ed, all voltages are relative
to SGND and all currents are positive into a pin.
Note 2: The LTC3811E is guaranteed to meet performance speci?cations
from 0°C to 85°C temperature. Speci?cations over the –40°C to
85°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls.
Note 3: T J is calculated from the ambient temperature T A and power
dissipation P D according to the following formula:
T J = T A + (P D ? TBD°C/W)
Note 4: The dynamic input supply current is higher due to power
MOSFET gate charging (Q G ? f OSC ). See Applications Information for more
Note 6: Guaranteed by design, not subject to test.
Note 7: The minimum on-time condition corresponds to an inductor peak-
to-peak ripple current of 50% of I MAX . See Applications Information for
more details.
Note 8: The voltage positioning ampli?er operates as a transconductance
ampli?er, where the input voltages are the SENSE + to SENSE – potentials
for both channels. The ampli?er output current ?ows through an external
resistor in order to program the amount of voltage droop at full load.
Note 9: The PHASEMODE function is only available in the QFN package.
The 36-lead GW package has a ?xed channel 1-to-channel 2 phase
relationship of 180°C and a channel 1-to-CLKOUT phase relationship of
90°C. The version in the 36-lead GW package is therefore optimized for
2- and 4-phase operation.
Note 10: Rise and fall times are measured at 10% and 90% levels.
information.
Note 5: The error ampli?ers are measured in a feedback loop using an
external servo operational ampli?er that drives the V FB pin and regulates
V COMP to be equal to the external control voltage.
3811f
5
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相关代理商/技术参数 |
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| LTC3812EFE5#PBF | 制造商:Linear Technology 功能描述: |
| LTC3812EFE-5#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 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 |
| LTC3812EFE-5#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP 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:2,500 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) |
| LTC3812IFE-5#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP 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:2,500 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) |
| LTC3812IFE-5#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16TSSOP 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:2,500 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) |
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