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| 型号： | LTC3601EMSE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/26页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1.5A 16MSOP |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
| 供应商设备封装： | 16-MSOP，裸露焊盘 |
LTC3601
APPLICATIONS INFORMATION
Checking Transient Response
The regulator loop response can be checked by observing
the response of the system to a load step. When con?g-
ured for external compensation, the availability of the
ITH pin not only allows optimization of the control loop
behavior but also provides a DC coupled and AC ?ltered
closed-loop response test point. The DC step, rise time,
and settling behavior at this test point re?ect the system’s
closed-loop response. Assuming a predominantly second
order system, the phase margin and/or damping factor can
be estimated by observing the percentage of overshoot
seen at this pin. The ITH external components shown in
Figure 3 will provide an adequate starting point for most
applications. The series R-C ?lter sets the pole-zero loop
compensation. The values can be modi?ed slightly, from
approximately 0.5 to 2 times their suggested values, to
optimize transient response once the ?nal PC layout is
done and the particular output capacitor type and value
have been determined. The output capacitors need to be
selected because their various types and values determine
the loop feedback factor gain and phase. An output cur-
rent pulse of 20% to 100% of full load current with a rise
time of 1μs to 10μs will produce output voltage and ITH
pin waveforms that will give a sense of the overall loop
stability without breaking the feedback loop
When observing the response of V OUT to a load step, the
initial output voltage step may not be within the bandwidth
of the feedback loop. As a result, the standard second
order overshoot/DC ratio cannot be used to estimate
phase margin. The output voltage settling behavior is
related to the stability of the closed-loop system and will
demonstrate the actual overall supply performance. For
a detailed explanation of optimizing the compensation
components, including a review of control loop theory,
refer to Linear Technology Application Note 76. As shown
in Figure 2 a feedforward capacitor, C F , may be added
across feedback resistor R1 to improve the high frequency
response of the system. Capacitor C F provides phase lead
by creating a high frequency zero with R1.
In some applications severe transients can be caused by
switching in loads with large (>10μF) input capacitors. The
discharged input capacitors are effectively put in parallel
with C OUT , causing a rapid drop in V OUT . No regulator can
deliver enough current to prevent this output droop if the
switch connecting the load has low resistance and is driven
quickly. The solution is to limit the turn-on speed of the
load switch driver. A Hot Swap? controller is designed
speci?cally for this purpose and usually incorporates cur-
rent limit, short-circuit protection and soft-start functions.
MODE/SYNC Operation
The MODE/SYNC pin is a multipurpose pin allowing both
mode selection and operating frequency synchronization.
Connecting this pin to INTV CC enables Burst Mode operation
for superior ef?ciency at low load currents at the expense
of slightly higher output voltage ripple. When the MODE/
SYNC pin is pulled to ground, forced continuous mode
operation is selected creating the lowest ?xed output ripple
at the expense of light load ef?ciency.
The LTC3601 will detect the presence of the external clock
signal on the MODE/SYNC pin and synchronize the internal
oscillator to the phase and frequency of the incoming clock.
The presence of an external clock will place the LTC3601
into forced continuous mode operation.
Output Voltage Tracking and Soft-Start
The LTC3601 allows the user to control the output voltage
ramp rate by means of the TRACK pin. From 0V to 0.6V
the TRACK pin will override the internal reference input
to the error ampli?er forcing regulation of the feedback
voltage to that seen at the TRACK pin. When the voltage
at the TRACK pin rises above 0.6V, tracking is disabled
and the feedback voltage will be regulated to the internal
reference voltage.
The voltage at the TRACK pin may be driven from an ex-
ternal source, or alternatively, the user may leverage the
internal 1.4μA pull-up current on TRACK to implement
3601fb
14
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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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