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参数资料
| 型号： | LTC3601EMSE#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1.5A 16MSOP |
| 标准包装： | 37 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.5 V ~ 14.52 V |
| 输入电压： | 4 V ~ 15 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 800kHz ~ 4MHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-TFSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 16-MSOP，裸露焊盘 |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
LTC3601
APPLICATIONS INFORMATION
The R DS(ON) for both the top and bottom MOSFETs can be
obtained from the Typical Performance Characteristics
curves. Thus to obtain I 2 R loss:
“I 2 R LOSS” = I OUT2 · (R SW + R L )
2. The internal LDO supplies the power to the INTV CC rail.
The total power loss here is the sum of the switching
losses and quiescent current losses from the control
circuitry.
Each time a power MOSFET gate is switched from low
to high to low again, a packet of charge dQ moves
from V IN to ground. The resulting dQ/dt is a current
out of INTV CC that is typically much larger than the DC
control bias current. In continuous mode, I GATECHG
= f(Q T + Q B ), where Q T and Q B are the gate charges
of the internal top and bottom power MOSFETs and f
is the switching frequency. For estimation purposes,
(Q T + Q B ) on the LTC3601 is approximately 1nC.
To calculate the total power loss from the LDO load,
simply add the gate charge current and quiescent cur-
rent and multiply by V IN :
P LDO = (I GATECHG + I Q ) ? V IN
3. Other “hidden” losses such as transition loss, cop-
per trace resistances, and internal load currents can
account for additional ef?ciency degradations in the
overall power system. Transition loss arises from the
brief amount of time the top power MOSFET spends in
the saturated region during switch node transitions. The
LTC3601 internal power devices switch quickly enough
that these losses are not signi?cant compared to other
sources.
Other losses, including diode conduction losses during
dead time and inductor core losses, generally account
for less than 2% total additional loss.
Thermal Considerations
The LTC3601 requires the exposed package backplane
metal (PGND pin on the QFN, SGND pin on the MSOP
package) to be well soldered to the PC board to provide
good thermal contact. This gives the QFN and MSOP
packages exceptional thermal properties, compared to
other packages of similar size, making it dif?cult in normal
operation to exceed the maximum junction temperature
of the part. In many applications, the LTC3601 does not
dissipate much heat due to its high ef?ciency and low
thermal resistance package backplane. However, in applica-
tions in which the LTC3601 is running at a high ambient
temperature, high input voltage, high switching frequency,
and maximum output current, the heat dissipated may
exceed the maximum junction temperature of the part. If
the junction temperature reaches approximately 150°C,
both power switches will be turned off until temperature
decreases approximately 10°C.
Thermal analysis should always be performed by the user
to ensure the LTC3601 does not exceed the maximum
junction temperature.
The temperature rise is given by:
T RISE = P D θ JA
where P D is the power dissipated by the regulator and θ JA
is the thermal resistance from the junction of the die to
the ambient temperature.
Consider the example in which an LTC3601EUD is operat-
ing with I OUT = 1.5A, V IN = 12V, f = 4MHz, V OUT = 1.8V,
and an ambient temperature of 70°C. From the Typical
Performance Characteristics section the R DS(ON) of the top
switch is found to be nominally 130mΩ while that of the
bottom switch is nominally 100mΩ yielding an equivalent
power MOSFET resistance R SW of:
R DS(ON) TOP ? 1.8/12 + R DS(ON) BOT ? 10.2/12 = 105mΩ.
3601fb
16
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| LTC3601EUD#PBF | 功能描述:IC REG BUCK SYNC ADJ 1.5A 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC3601EUD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 1.5A 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC3601EUDPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 4-15V QFN16EP |
| LTC3601IMSE#PBF | 功能描述:IC REG BUCK SYNC ADJ 1.5A 16MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3601IMSE#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 1.5A 16MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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