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参数资料
| 型号： | LTC1871EMS |
| 厂商： | Linear Technology |
| 文件页数： | 4/36页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST FLYBK CM 10MSOP |
| 标准包装： | 50 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 97% |
| 电源电压： | 2.5 V ~ 36 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： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
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LTC1871
ELECTRICAL CHARACTERISTICS The l denotes the speci?cations which apply over the full operating
temperature range, otherwise speci?cations are at T A = 25°C. V IN = V INTVCC = 5V, V RUN = 1.5V, R FREQ = 80k, V MODE/SYNC = 0V, unless
otherwise speci?ed.
SYMBOL
D MAX
f SYNC/ f OSC
t SYNC(MIN)
PARAMETER
Maximum Duty Cycle
Recommended Maximum Synchronized
Frequency Ratio
MODE/SYNC Minimum Input Pulse Width
CONDITIONS
I-Grade or H-Grade (Note 2)
f OSC = 300kHz (Note 6)
f OSC = 300kHz (Note 6), I-Grade or H-Grade (Note 2)
V SYNC = 0V to 5V
●
●
MIN
87
87
TYP
92
92
1.25
1.25
25
MAX
97
97
1.30
1.30
UNITS
%
%
ns
t SYNC(MAX)
V IL(MODE)
MODE/SYNC Maximum Input Pulse Width V SYNC = 0V to 5V
Low Level MODE/SYNC Input Voltage
0.8/f OSC
0.3
ns
V
I-Grade or H-Grade (Note 2)
●
0.3
V
V IH(MODE)
High Level MODE/SYNC Input Voltage
1.2
V
I-Grade or H-Grade (Note 2)
●
1.2
V
R MODE/SYNC
V FREQ
MODE/SYNC Input Pull-Down Resistance
Nominal FREQ Pin Voltage
50
0.62
kΩ
V
Low Dropout Regulator
V INTVCC
Δ V INTVCC
INTV CC Regulator Output Voltage
INTV CC Regulator Line Regulation
V IN = 7.5V
V IN = 7.5V, I-Grade (Note 2)
V IN = 7.5V, H-Grade (Note 2)
7.5V ≤ V IN ≤ 15V
●
●
5.0
5.0
4.95
5.2
5.2
5.2
8
5.4
5.4
5.45
25
V
V
V
mV
Δ V IN1
Δ V INTVCC
INTV CC Regulator Line Regulation
15V ≤ V IN ≤ 30V
70
200
mV
Δ V IN2
V LDO(LOAD)
V DROPOUT
INTV CC Load Regulation
INTV CC Regulator Dropout Voltage
0 ≤ I INTVCC ≤ 20mA, V IN = 7.5V
V IN = 5V, INTV CC Load = 20mA
–2
–0.2
280
%
mV
I INTVCC
Bootstrap Mode INTV CC Supply
Current in Shutdown
RUN = 0V, SENSE = 5V
I-Grade (Note 2)
H-Grade (Note 2)
●
●
10
20
30
50
μA
μA
μA
GATE Driver
t r
t f
GATE Driver Output Rise Time
GATE Driver Output Fall Time
C L = 3300pF (Note 7)
C L = 3300pF (Note 7)
17
8
100
100
ns
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.
Note 2: The LTC1871E is guaranteed to meet performance speci?cations
from 0°C to 85°C operating temperature. Speci?cations over the – 40°C to
85°C operating temperature range are assured by design, characterization
and correlation with statistical process controls. The LTC1871I is
guaranteed over the full –40°C to 125°C operating temperature range
and the LTC1871H is guaranteed over the full –40°C to 150°C operating
temperature range.
Note 4: The dynamic input supply current is higher due to power MOSFET
gate charging (Q G ? f OSC ). See Applications Information.
Note 5: The LTC1871 is tested in a feedback loop which servos V FB to
the reference voltage with the I TH pin forced to the midpoint of its voltage
range (0.3V ≤ V ITH ≤ 1.2V, midpoint = 0.75V).
Note 6: In a synchronized application, the internal slope compensation
gain is increased by 25%. Synchronizing to a signi?cantly higher ratio will
reduce the effective amount of slope compensation, which could result in
subharmonic oscillation for duty cycles greater than 50%.
Note 7: Rise and fall times are measured at 10% and 90% levels.
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 ? 110°C/W)
1871fe
4
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相关代理商/技术参数 |
参数描述 |
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| LTC1871EMS#PBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP 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 |
| LTC1871EMS#TR | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP RoHS:否 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) |
| LTC1871EMS#TRPBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP 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) |
| LTC1871EMS-1#PBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP 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) |
| LTC1871EMS-1#TRPBF | 功能描述:IC REG CTRLR BST FLYBK CM 10MSOP 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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