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| 型号： | LTC3861EUHE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/38页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 36-QFN |
| 标准包装： | 61 |
| 系列： | PolyPhase® |
| PWM 型： | 电压模式 |
| 输出数： | 2 |
| 频率 - 最大： | 2.1MHz |
| 占空比： | 91.5% |
| 电源电压： | 3 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： | 36-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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LTC3861
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T J = 25°C (Note 3). V CC = 5V, V RUN1,2 = 5V, V FREQ = V CLKIN = 0V,
V FB = 0.6V, f OSC = 0.6MHz, unless otherwise specified.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
V CM(ISENSE)
I ISENSE
Input Common Mode Range
SENSE Pin Input Current
V CM = 1.5V
–0.3
100
V CC – 0.5
V
nA
V OS
Current Sense Input Referred Offset
–40°C to 125°C
l
–1.25
1.25
mV
Oscillator and Phase-Locked Loop
f OSC
Oscillator Frequency
V CLKIN = 0V
V FREQ = 0V
V FREQ = 5V
l
l
540
0.9
600
1
660
1.15
kHz
MHz
V CLKIN = 5V
R FREQ < 24.9k
R FREQ = 36.5k
R FREQ = 48.7k
R FREQ = 64.9k
R FREQ = 88.7k
200
600
1
1.45
2.1
kHz
kHz
MHz
MHz
MHz
Maximum Frequency
Minimum Frequency
3
0.25
MHz
MHz
I FREQ
t CLKIN(HI)
t CLKIN(LO)
FREQ Pin Output Current
CLKIN Pulse Width High
CLKIN Pulse Width Low
V FREQ = 0.8V
V CLKIN = 0V to 5V
V CLKIN = 0V to 5V
18.5
100
100
20
21.5
μA
ns
ns
R CLKIN
CLKIN Pull-Up Resistance
13
kΩ
V CLKIN
V FREQ
V OL(CLKOUT)
V OH(CLKOUT)
θ 2 - θ 1
θ CLKOUT - θ 1
CLKIN Input Threshold
FREQ Input Threshold
CLKOUT Low Output Voltage
CLKOUT High Output Voltage
Channel 1-to-Channel 2 Phase Relationship
CLKOUT-to-Channel 1 Phase Relationship
V CLKIN Falling
V CLKIN Rising
V CLKIN = 0V
V FREQ Falling
V FREQ Rising
I LOAD = –500μA
I LOAD = 500μA
V PHSMD = 0V
V PHSMD = Float
V PHSMD = V CC
V PHSMD = 0V
V PHSMD = Float
V PHSMD = V CC
1.2
2
1.5
2.5
0.2
V CC – 0.2
180
180
120
60
90
240
V
V
V
V
V
V
Deg
Deg
Deg
Deg
Deg
Deg
PWM/PWMEN Outputs
PWM
PWM Output High Voltage
PWM Output Low Voltage
I LOAD = 500μA
I LOAD = –500μA
l
l
4.5
0.5
V
V
PWM Output Current in Hi-Z State
PWM Maximum Duty Cycle
91.5
±5
μA
%
PWMEN
PWMEN Output High Voltage
I LOAD = 1mA
l
4.5
V
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: 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 ? 34°C/W)
Note 3: The LTC3861 is tested under pulsed load conditions such that
T J ≈ T A . The LTC3861E is guaranteed to meet performance 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
LTC3861I is guaranteed over the full –40°C to 125°C operating junction
temperature range. The maximum ambient temperature consistent with
these specifications is determined by specific operating conditions in
conjunction with board layout, the rated package thermal resistors and
other environmental factors.
Note 4: Guaranteed by design.
4
For more information www.linear.com/LTC3861
3861fa
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