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參數資料
| 型號： | LTC3616IUDD#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 13.5 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 3 X 5 MM, LEAD FREE, PLASTIC, QFN-24 |
| 文件頁數： | 11/28頁 |
| 文件大?。?/td> | 490K |
| 代理商： | LTC3616IUDD#TRPBF |
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LTC3616
19
3616fa
applicaTions inForMaTion
In addition, tying the SRLIM/DDR pin to SVIN, lower
external reference voltage and tracking output voltage
between channels are possible. See the Output Voltage
Tracking and External Reference Input sections.
Soft-Start
The RUN pin provides a means to shut down the LTC3616.
Tying the RUN pin to SGND places the LTC3616 in a low
quiescent current shutdown state (IQ < 1A).
When the LTC3616 is enabled by pulling the RUN pin high,
the chip enters a soft start-up state. The type of soft start-
up behavior is set by the TRACK/SS pin:
1. Tying TRACK/SS to SVIN 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 ex-
ternally with a resistor and capacitor on the TRACK/SS
pinasshowninFigure1.TheTRACK/SSpinreducesthe
value of the internal reference at VFB until TRACK/SS is
pulled above 0.6V. The external soft-start duration can
be calculated by using the following formula:
tSS = RSS CSS ln
SVIN
SVIN – 0.6V
3. The TRACK/SS pin can be used to track the output
voltage of another supply.
Each time the RUN pin is tied high and the LTC3616 is
turned on, the TRACK/SS pin is internally pulled down
for ten microseconds in order to discharge the external
capacitor. This discharging time is typically adequate
for capacitors up to about 33nF. If a larger capacitor is
required, connect the external soft-start resistor to the
RUN pin.
Regardless of either internal or external soft-start state,
the MODE pin is ignored and soft-start will always be
in pulse-skipping mode. In addition, the PGOOD pin
is kept low and foldback of the switching frequency is
disabled.
Programmable Switch Pin Slew Rate
Asswitchingfrequenciesrise,itisdesirabletominimizethe
transitiontimerequiredwhenswitchingtominimizepower
losses and blanking time for the switch to settle. However,
fast slewing of the switch node results in relatively high
external radiated EMI and high on chip supply transients,
which can cause problems for some applications.
The LTC3616 allows the user to control the slew rate of the
switching node SW by using the SRLIM/DDR pin. Tying
this pin to ground selects the fastest slew rate. The slow-
est slew rate is selected when the pin is open. Connecting
a resistor (between 10k and 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.
Particularattentionshouldbeusedwithveryhighswitching
frequencies. Using the slowest slew rate (SRLIM open)
can reduce the minimum duty cycle capability.
Figure 5. Slew Rate at SW Pin vs SRLIM/DDR Resistor: Open, 100k, 10k
2ns/DIV
SW
SW
PIN
10k
100k
OPEN
3616 F05
VIN = 3.3V
VOUT = 1.8V
fSW = 2.25MHz
2ns/DIV
VIN = 3.3V
VOUT = 1.8V
fSW = 2.25MHz
10k
100k
OPEN
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| LTC3616MPUDD#PBF | 制造商:Linear Technology 功能描述:IC REG BUCK SYNC ADJ 6A 24QFN |
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| LTC3617EUDD#PBF | 功能描述:IC REG SYNC 6A BUCK 24-QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:2,000 系列:- 應用:控制器，DSP 輸入電壓:4.5 V ~ 25 V 輸出數:2 輸出電壓:最低可調至 1.2V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:30-TFSOP（0.173"，4.40mm 寬） 供應商設備封裝:30-TSSOP 包裝:帶卷 (TR) |
| LTC3617EUDD#TRPBF | 功能描述:IC REG SYNC 6A BUCK 24QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數:1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
| LTC3617IUDD#PBF | 功能描述:IC REG SYNC 6A BUCK 24QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 專用型 系列:- 標準包裝:43 系列:- 應用:控制器，Intel VR11 輸入電壓:5 V ~ 12 V 輸出數:1 輸出電壓:0.5 V ~ 1.6 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:48-VFQFN 裸露焊盤 供應商設備封裝:48-QFN（7x7） 包裝:管件 |
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