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参数资料
| 型号： | LTC3615EFE-1#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, PDSO24 |
| 封装： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-24 |
| 文件页数： | 14/32页 |
| 文件大小： | 585K |
| 代理商： | LTC3615EFE-1#TRPBF |
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LTC3615/LTC3615-1
21
3615fa
(7a) Slew Rate of Rising Edge at SW1/2 vs SRLIM Resistor
The LTC3615 allows the user to control the slew rate of
the switching node SW by using the SRLIM pin. Tying this
pin to ground selects the fastest slew rate. The slowest
slew rate is selected when the pin is open. Connecting a
resistor (between 10k to 100k) from SRLIM pin to ground
adjusts the slew rate between the maximum and minimum
values. The reduced dV/dt of the switch node results in a
signicant reduction of the supply and ground ringing, as
well as lower radiated EMI. See Figure 7a and the Typical
Performance Characteristics section for examples.
Reducing the slew rate causes a trade-off between ef-
ciency and low EMI (see Figure 7b).
Particular attention should be used with very high switching
frequencies. Using the slowest slew rate (SRLIM open)
can reduce the minimum duty cycle capability.
Soft-Start
The RUNx pins provide a means to shut down each chan-
nel of the LTC3615. Pulling both pins below 0.3V places
the LTC3615 in a low quiescent current shutdown state
(IQ < 1μA).
After enabling the LTC3615 by bringing either one or both
RUNx pins above the threshold, the enabled channels enter
a soft-start-up state. The type of soft-start behavior is set
by the TRACK/SSx pins. The soft-start cycle begins with
an initial discharge pulse pulling down the TRACK/SSx
pin to SGND and discharging the external capacitor CSS
(see Figure 3).
The initial discharge is adequate to discharge capacitors
up to 33nF. If a larger capacitor is required, connect the
external soft-start resistor RSS to the RUN pin to fully
discharge the capacitor.
1. Tying this pin to SVIN selects the internal soft-start
circuit. This circuit ramps the output voltage to the nal
value within 1ms.
2. If a longer soft-start period is desired, it can be set ex-
ternally with a resistor and capacitor on the TRACK/SSx
pins as shown in Figure 3. The voltage applied at the
TRACK/SSx pins sets the value of the internal refer-
ence at VFB until TRACK/SSx is pulled above 0.6V. The
external soft-start duration can be calculated by using
the following equation:
tR
C
In
SV
V
SS
IN
=
–.
06
3. The TRACK/SSx pin can be used to track the output
voltage of another supply.
Regardless of either the internal or external soft-start
state, the MODE pin is ignored during start-up and the
regulator defaults to pulse-skipping mode. In addition,
the PGOODx pin is kept low, and the frequency foldback
function is disabled.
APPLICATIONS INFORMATION
(7b) Efciency vs SRLIM Resistor Programming
Figure 7. Slew Rate and the SRLIM Resistor
1V/DIV
2ns/DIV
3615 F07a
SRLIM =
SGND OR SVIN
VIN = 3.3V
VOUT = 1.8V
IOUT = 1A
OPEN
40.2k
100k
VIN (V)
2.25
82
EFFICIENCY
(%)
84
86
88
3.06
3.88
4.69
90
92
83
85
87
89
91
5.50
3615 07b
VOUT = 1.8V
IOUT = 1A
FCM
GND OR SVIN
OPEN
40.2k
20k
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| LTC3615IUF-1#PBF | SWITCHING REGULATOR, PQCC24 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3615EUF#PBF | 功能描述:IC REG BUCK SYNC ADJ 3A DL 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 |
| LTC3615EUF#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 3A DL 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 |
| LTC3615EUF-1#PBF | 功能描述:IC REG BUCK SYNC ADJ 3A DL 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 |
| LTC3615EUF-1#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 3A DL 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 |
| LTC3615EUFPBF | 制造商:Linear Technology 功能描述:Dual 4MHz 3A Synch Step-Down DC/DC QFN24 |
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