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参数资料
| 型号： | LTC3613IWKH#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 20/36页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 15A 56QFN |
| 标准包装： | 40 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 4.5 V ~ 24 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz ~ 1MHz |
| 电流 - 输出： | 15A |
| 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： | 56-VFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 56-QFN 多焊盘（7x9） |
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LTC3613
APPLICATIONS INFORMATION
For applications where the main input power is less than
5.3V, tie the V IN and INTV CC pins together and tie the
combined pins to the PV IN input with an optional 1Ω or
2.2Ω resistor as shown in Figure 5 to minimize the voltage
drop caused by the gate charge current. This will override
the INTV CC LDO and will prevent INTV CC from dropping
too low due to the dropout voltage.
LTC3613
Soft-Start and Tracking
The LTC3613 has the ability to either soft-start by itself
with a capacitor or track the output of an external supply.
Soft-start or tracking features are achieved not by limiting
the maximum output current of the switching regulator
but by controlling the regulator’s output voltage according
to the ramp rate on the TRACK/SS pin.
When configured to soft-start by itself, a capacitor should
PV IN
INTV CC
C IN
V IN
be connected to the TRACK/SS pin. TRACK/SS is pulled
low until the RUN pin voltage exceeds 1.2V and UVLO is
released, at which point an internal current of 1μA charges
SV IN
R VIN
C VCC
the soft-start capacitor, C SS , connected to TRACK/SS.
Current foldback is disabled during this phase to ensure
t SOFTSTART =0.6V ? SS
3613 F05
Figure 5. Setup for V IN ≤ 5V
V IN Undervoltage Lockout (UVLO)
The LTC3613 has two functions that help protect the con-
troller in case of input undervoltage conditions. A precision
UVLO comparator constantly monitors the INTV CC voltage
to ensure that an adequate gate-drive voltage is present.
The comparator enables UVLO and locks out the switch-
ing action until INTV CC rises above 4.2V. Once UVLO is
released, the comparator does not retrigger UVLO until
INTV CC falls below 3.65V. This hysteresis prevents oscil-
lations when there are disturbances on INTV CC .
Another way to detect an undervoltage condition is to
monitor the V IN supply. Because the RUN pin has a precision
turn-on voltage of 1.2V, one can use a resistor divider from
V IN to turn on the IC when V IN is high enough. The RUN pin
has bias currents that depend on the RUN voltage as well as
SV IN voltage. These bias currents should be taken into ac-
smooth soft-start or tracking. The soft-start or tracking
range is defined to be the voltage range from 0V to 0.6V
on the TRACK/SS pin. The total soft-start time can be
calculated as:
C
1 μA
When the LTC3613 is configured to track another supply,
a voltage divider can be used from the tracking supply to
the TRACK/SS pin to scale the ramp rate appropriately.
Two common implementations of tracking as shown in
Figure 6 are coincident and ratiometric. For coincident
tracking, make the divider ratio from the external supply
the same as the divider ratio for the differential feedback
voltage. Ratiometric tracking could be achieved by using
a different ratio than the differential feedback (Figure 7).
Note that the small soft-start capacitor charging current is
always flowing, producing a small offset error. To minimize
this error, select the tracking resistive divider values to be
small enough to make this offset error negligible.
count when designing the voltage divider and UVLO circuit
to prevent faulty conditions. Generally for RUN < 3V a bias
current of 1.3μA flows out of the RUN pin, and for RUN >
3V, correspondingly increasing current flows into the pin,
reaching about 35μA for RUN = 6V.
3613fa
20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3614EUDD#PBF | 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN 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 |
| LTC3614EUDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN 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 |
| LTC3614IUDD#PBF | 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LTC3614IUDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LTC3614MPUDD#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 4A 24QFN |
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