参数资料
型号: LTC3867EUF#PBF
厂商: Linear Technology
文件页数: 5/36页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM CM 24-QFN
产品培训模块: LTC3867 Synchronous Step-Down DC/DC Controller
标准包装: 91
PWM 型: 电流模式
输出数: 1
频率 - 最大: 1.2MHz
占空比: 98%
电源电压: 4 V ~ 38 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 24-WFQFN 裸露焊盘
包装: 管件
LTC3867
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T A = 25°C (Note 2). V IN = 15V, V RUN = 5V unless otherwise specified.
SYMBOL
TG t r
TG t f
BG t r
BG t f
TG/BG t 1D
BG/TG t 2D
PARAMETER
TG Transition Time
Rise Time
Fall Time
BG Transition Time
Rise Time
Fall Time
Top Gate Off to Bottom Gate On Delay,
Synchronous Switch-On Delay Time
Bottom Gate Off to Top Gate On Delay,
Top Switch-On Delay Time
CONDITIONS
C LOAD = 3300pF
C LOAD = 3300pF (Note 5)
C LOAD = 3300pF
C LOAD = 3300pF (Note 5)
C LOAD = 3300pF Each Driver
C LOAD = 3300pF Each Driver
MIN
TYP
25
25
25
25
30
30
MAX
UNITS
ns
ns
ns
ns
ns
ns
Thermal Shutdown
I ITSD
V ITSD
Source Current
Comparator Trip Point
I ITSD = 500mV
20
950
μA
mV
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 LTC3867 is tested under pulsed load conditions such that
T J ≈ T A . The LTC3867E is guaranteed to meet performance specifications
from 0°C to 85°C operating 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 LTC3867I 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: The LTC3867 is tested in a feedback loop that servos V ITH to a
specified voltage and measures the resultant V FB .
Note 4: Dynamic supply current is higher due to the gate charge being
delivered at the switching frequency. See Applications Information.
Note 5: Rise and fall times are measured using 10% and 90% levels. Delay
times are measured using 50% levels.
Note 6: The minimum on-time condition corresponds to the on inductor
peak-to-peak ripple current ≥40% of I MAX (see Minimum On-Time
Considerations in the Applications Information section).
Note 7: Guaranteed by design.
T J is calculated from the ambient temperature, T A , and power dissipation,
P D , according to the following formula:
LTC3867UF: T J = T A + (P D ? 47°C/W)
3867f
5
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