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参数资料
| 型号： | LTC3615EUF#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 21/32页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A DL 24QFN |
| 标准包装： | 91 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 400kHz ~ 4MHz |
| 电流 - 输出： | 3A |
| 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： | 24-WFQFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 24-QFN 裸露焊盘（4x4） |
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LTC3615/LTC3615-1
APPLICATIONS INFORMATION
SV IN
t SS = R SS ? C SS ? In ? ?
TheLTC3615allowstheusertocontroltheslewrateof
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
significant 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-
ficiency 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
(I Q < 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
C SS (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 R SS to the RUN pin to fully
discharge the capacitor.
1. Tying this pin to SV IN selects the internal soft-start
circuit. This circuit ramps the output voltage to the final
value within 1ms.
2. If a longer soft-start period is desired, it can be set
externally 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 V FB until TRACK/SSx is pulled above 0.6V. The
external soft-start duration can be calculated by using
the following equation:
? ?
? SV IN – 0.6V ?
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.
V IN = 3.3V
V OUT = 1.8V
I OUT = 1A
SRLIM =
SGND OR SV IN
92
91
90
89
V OUT = 1.8V
I OUT = 1A
FCM
GND OR SV IN
1V/DIV
40.2k
100k
88
87
40.2k
20k
OPEN
OPEN
86
85
84
83
2ns/DIV
3615 F07a
82
2.25
3.06
3.88
4.69
5.50
V IN (V)
3615 07b
(7a) Slew Rate of Rising Edge at SW1/2 vs SRLIM Resistor
(7b) Efficiency vs SRLIM Resistor Programming
Figure 7. Slew Rate and the SRLIM Resistor
21
For more information www.linear.com/LTC3615
3615fb
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