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| 型号： | LTC3839EUH#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 4/50页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM CM 32-QFN |
| 标准包装： | 73 |
| 系列： | PolyPhase® |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 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： | 32-WFQFN 裸露焊盘 |
| 包装： | 管件 |
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LTC3839
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
–3.5
4.8
V
%
V
EXTV CC Switchover Hysteresis
EXTV CC to DRV CC2 Voltage Drop
EXTV CC Falling from Switchover Voltage
V EXTVCC = 5V, I DRVCC2 = –100mA
200
200
mV
mV
PGood Output
OV
UV
PGOOD Overvoltage Threshold
PGOOD Undervoltage Threshold
V OUT Rising, with Respect to Regulated Voltage
V OUT Falling, with Respect to Regulated Voltage
5
–5
7.5
–7.5
10
–10
%
%
PGOOD Threshold Hysteresis
V OUT Returning to Reference Voltage
2
%
V PGOOD(L)
t D(PGOOD)
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 LTC3839 is tested under pulsed loading conditions such that
T J ≈ T A . The LTC3839E is guaranteed to meet specifications over the 0°C
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 LTC3839I 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.
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 LTC3839 is tested in a feedback loop that adjusts the
differential feedback voltage (V OUTSENSE+ – V OUTSENSE– ) to
achieve specified error amplifier output voltages (ITH).
Note 6: Delay times are measured with top gate (TG) and bottom gate
(BG) driving minimum load, and using 50% levels.
Note 7: In order to simplify the total system error computation, the
regulated voltage is defined in one combined specification which includes
the effects of line, load and common mode variation. The combined
regulated voltage specification is tested by independently varying line,
load, and common mode, which by design do not significantly affect one
another. For any combination of line, load, and common mode variation,
the regulated voltage should be within the limits specified that are tested in
production to the following conditions:
? Line: V IN = 4.5V to 38V, ITH = 1.2V, V OUTSENSE– = 0V
? Load: V IN = 15V, ITH = 0.5V to 1.9V, V OUTSENSE– = 0V
? Common mode: V IN = 15V, ITH = 1.2V, to V OUTSENSE– = ±500mV
3839fa
4
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| LTC3839IUH#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LTC3839IUH#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 32-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:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 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:24-WQFN 裸露焊盘 包装:带卷 (TR) |
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