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| 型号： | LTC3838EUHF#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 5/54页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 38-QFN |
| 标准包装： | 2,500 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 2 |
| 频率 - 最大： | 2MHz |
| 电源电压： | 4.5 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： | 38-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
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LTC3838
ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating
junction temperature range, otherwise specifications are at T A = 25°C. V IN = 15V unless otherwise noted (Note 3).
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Internal V CC Regulator
V DRVCC1
V EXTVCC
Internally Regulated DRV CC1 Voltage
DRV CC1 Load Regulation
EXTV CC Switchover Voltage
6V < V IN < 38V
I DRVCC1 = 0mA to –100mA
EXTV CC Rising
5.0
4.4
5.3
–1.5
4.6
5.6
–3
4.8
V
%
V
EXTV CC Switchover Hysteresis
200
mV
EXTV CC to DRV CC2 Voltage Drop
V EXTVCC = 5V, I DRVCC2 = –100mA
200
mV
PGood Output
OV
UV
PGOOD Overvoltage Threshold
PGOOD Undervoltage Threshold
V FB1,2 Rising, with Respect to Regulated Voltage
V FB1,2 Falling, with Respect to Regulated Voltage
5
–5
7.5
–7.5
10
–10
%
%
PGOOD Threshold Hysteresis
V FB1,2 Returning to Reference Voltage
2
%
V PGOOD(L)1,2
t D(PGOOD)1,2
PGOOD Low Voltage
Delay from V FB Fault (OV/UV) to PGOOD
I PGOOD = 2mA
0.1
50
0.3
V
μs
Falling
Delay from V FB Good to PGOOD Rising
20
μs
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 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 (in °C/W) is the package thermal impedance.
Note 3: The LTC3838 is tested under pulsed loading conditions such that
T J ≈ T A . The LTC3838E is guaranteed to meet specifications over the 0°C
Note 4: 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 5: The LTC3838 is tested in a feedback loop that adjusts
(V OUTSENSE1+ – V OUTSENSE1– ) or V FB2 to achieve specified error amplifier
output voltages (ITH1,2).
Note 6: Delay times are measured with top gate (TG) and bottom gate
(BG) driving minimum load, and using 50% levels.
to 85°C operating junction temperature range. Specifications over the
–40°C to 125°C operating junction temperature range are assured by
design, characterization and correlation with statistical process controls.
The LTC3838I is guaranteed to meet specifications over the –40°C to
125°C operating junction temperature range . 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.
3838fa
5
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