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参数资料
| 型号： | LTC3869EUFD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/42页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 28-QFN |
| 标准包装： | 73 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 850kHz |
| 占空比： | 95% |
| 电源电压： | 4 V ~ 38 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： | 28-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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LTC3869/LTC3869-2
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating
junction temperature range, otherwise specifications are at T A = 25°C (Note 2). V IN = 15V, V RUN1,2 = 5V unless otherwise noted.
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
INTV CC Linea r Regulator
V INTVCC
V LDO INT
Internal V CC Voltage
INTV CC Load Regulation
6V < V IN < 38V
I CC = 0mA to 20mA
4.8
5
0.5
5.2
2
V
%
V EXTVCC
EXTV CC Switchover Voltage
EXTV CC Ramping Positive
l
4.5
4.7
V
V LDOHYS
EXTV CC Hysteresis
200
mV
V LDO EXT
EXTV CC Voltage Drop
I CC = 20mA, V EXTVCC = 5V
50
100
mV
PGOOD Output
V PGL
PGOOD Voltage Low
I PGOOD = 2mA
0.1
0.3
V
I PGOOD
V PG
PGOOD Leakage Current
PGOOD Trip Level
V PGOOD = 5V
V FB with Respect to Set Output Voltage
V FB Ramping Negative
V FB Ramping Positive
–10
10
±2
μA
%
%
Oscillator an d Phase-Locked Loop
f NOM
f LOW
f HIGH
Nominal Frequency
Lowest Frequency
Highest Frequency
V FREQ = 1.2V
V FREQ = 0V
V FREQ ≥ 2.4V
450
210
700
500
250
780
550
290
850
kHz
kHz
kHz
R MODE/PLLIN MODE/PLLIN Input Resistance
250
k?
I FREQ
Frequency Setting Current
9
10
11
μA
On Chip Driver
TG R UP
TG R DOWN
BG R UP
BG R DOWN
TG Pull-Up R DS(ON)
TG Pull-Down R DS(ON)
BG Pull-Up R DS(ON)
BG Pull-Down R DS(ON)
TG High
TG Low
BG High
BG Low
2.6
1.5
2.4
1.1
Ω
Ω
Ω
Ω
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 LTC3869 is tested under pulsed load conditions such that
T J ≈ T A . The LTC3869E is guaranteed to meet performance specifications
from 0°C to 85°C. Specifications over the –40°C to 125°C operating
junction temperature range are assured by design, characterization
and correlation with statistical process controls. The LTC3869I is
guaranteed to meet performance specifications 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 package thermal
impedance and other environmental factors.
Note 3: T J is calculated from the ambient temperature T A and power
dissipation P D according to the following formulas:
LTC3869UFD: T J = T A + (P D ? 34° C/W)
LTC3869GN-2: T J = T A + (P D ? 80° C/W)
Note 4: The LTC3869 is tested in a feedback loop that servos V ITH1,2 to a
specified voltage and measures the resultant V FB1,2 .
Note 5: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 6: Delay times are measured using 50% levels.
Note 7: The minimum on-time condition is specified for an inductor
peak-to-peak ripple current ≥40% of I MAX (see Minimum On-Time
Considerations in the Applications Information section).
Note 8: Guaranteed by design.
38692fa
4
For more information www.linear.com/LTC3869
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