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| 型号： | LTC3787EUFD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/36页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 28-QFN |
| 标准包装： | 73 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 850kHz |
| 占空比： | 100% |
| 电源电压： | 4.5 V ~ 38 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： | 28-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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LTC3787
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T A = 25°C, VBIAS = 12V, unless otherwise noted (Note 2).
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
INTV CC Linear Regulator
V INTVCC(VIN)
VLDO INT
V INTVCC(EXT)
VLDO EXT
Internal V CC Voltage
INTV CC Load Regulation
Internal V CC Voltage
INTV CC Load Regulation
6V < V BIAS < 38V, V EXTVCC = 0
I CC = 0mA to 50mA
V EXTVCC = 6V
I CC = 0mA to 40mA, V EXTVCC = 6V
5.2
5.2
5.4
0.5
5.4
0.5
5.6
2
5.6
2
V
%
V
%
V EXTVCC
EXTV CC Switchover Voltage
EXTV CC Ramping Positive
l
4.5
4.8
5
V
V LDOHYS
EXTV CC Hysteresis
250
mV
Oscillator and Phase-Locked Loop
f PROG
Programmable Frequency
R FREQ = 25k
105
kHz
R FREQ = 60k
R FREQ = 100k
335
400
760
465
kHz
kHz
f LOW
f HIGH
Lowest Fixed Frequency
Highest Fixed Frequency
V FREQ = 0V
V FREQ = INTV CC
320
488
350
535
380
585
kHz
kHz
f SYNC
Synchronizable Frequency
PLLIN/MODE = External Clock
l
75
850
kHz
PGOOD Output
V PGL
I PGOOD
PGOOD Voltage Low
PGOOD Leakage Current
I PGOOD = 2mA
V PGOOD = 5V
0.2
0.4
±1
V
μA
V PGOOD
PGOOD Trip Level
V FB with Respect to Set Regulated Voltage
V FB Ramping Negative
Hysteresis
V FB Ramping Positive
Hysteresis
–12
8
–10
2.5
10
2.5
–8
12
%
%
%
%
t PGOOD(DELAY)
PGOOD Delay
PGOOD Going High to Low
25
μs
BOOST1 and BOOST2 Charge Pump
I BOOST1,2
BOOST Charge Pump Available Output
V SW1,2 = 12V; V BOOST1,2 – V SW1,2 = 4.5V;
55
μA
Current
FREQ = 0V, Forced Continuous or
Pulse-Skipping Mode
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 LTC3787 is tested under pulsed load conditions such that
T J ≈ T A . The LTC3787E is guaranteed to meet specifications from
0°C to 85°C junction temperature. Specifications over the –40°C to
125°C operating junction temperature range are assured by design,
characterization and correlation with statistical process controls. The
LTC3787I is guaranteed over the –40°C to 125°C operating junction
temperature range, the LTC3787H is guaranteed over the –40°C to 150°C
operating temperature range and the LTC3787MP is tested and guaranteed
over the full –55°C to 150°C operating junction temperature range. High
junction temperatures degrade operating lifetimes; operating lifetime
is derated for junction temperatures greater than 125°C. Note that the
maximum ambient temperature consistent with these specifications is
determined by specific operating conditions in conjunction with board
layout, the rated package thermal impedance and other environmental
factors. The junction temperature (T J , in °C) is calculated from the ambient
temperature (T A , in °C) and power dissipation (P D , in Watts) according to
the formula: T J = T A + (P D ? θ JA ), where θ JA = 43°C/W for the QFN package
and θ JA = 90°C/W for the SSOP package.
Note 3: This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. The maximum
rated junction temperature will be exceeded when this protection is active.
Continuous operation above the specified absolute maximum operating
junction temperature may impair device reliability or permanently damage
the device.
Note 4: The LTC3787 is tested in a feedback loop that servos V FB to the
output of the error amplifier while maintaining I TH at the midpoint of the
current limit range.
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency.
Note 6: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 7: see Minimum On-Time Considerations in the Applications
Information section.
3787fc
4
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相关代理商/技术参数 |
参数描述 |
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| LTC3787HGN#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: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 |
| LTC3787HGN#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: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 |
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| LTC3787HUFD#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: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 |
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