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參數資料
| 型號： | LTC3419EMS#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.2 A DUAL SWITCHING CONTROLLER, 2250 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | PLASTIC, MSOP-10 |
| 文件頁數： | 4/16頁 |
| 文件大?。?/td> | 264K |
| 代理商： | LTC3419EMS#TR |
LTC3419
12
3419f
The RDS(ON)forboththetopandbottomMOSFETscanbe
obtained from the Typical Performance Characteristics
curves. Thus, to obtain I2R losses:
I2R losses = IOUT2 (RSW + RL)
4. Other “hidden” losses, such as copper trace and internal
battery resistances, can account for additional efciency
degradations in portable systems. It is very important
to include these “system” level losses in the design of a
system. The internal battery and fuse resistance losses
can be minimized by making sure that CIN has adequate
charge storage and very low ESR at the switching fre-
quency. Other losses, including diode conduction losses
during dead-time, and inductor core losses, generally
account for less than 2% total additional loss.
Thermal Considerations
In a majority of applications, the LTC3419 does not dis-
sipate much heat due to its high efciency. In the unlikely
event that the junction temperature somehow reaches ap-
proximately 150°C, both power switches will be turned off
and the SW node will become high impedance. The goal
of the following thermal analysis is to determine whether
the power dissipated causes enough temperature rise to
exceed the maximum junction temperature (125°C) of the
part. The temperature rise is given by:
TRISE = PD θJA
Where PD is the power dissipated by the regulator and
θJA is the thermal resistance from the junction of the die
to the ambient temperature. The junction temperature,
TJ, is given by:
TJ = TRISE + TAMBIENT
As a worst-case example, consider the case when the
LTC3419 is in dropout on both channels at an input volt-
age of 2.7V with a load current of 600mA and an ambi-
ent temperature of 70°C. From the Typical Performance
Characteristics graph of Switch Resistance, the RDS(ON)
of the main switch is 0.6Ω. Therefore, power dissipated
by each channel is:
PD = IOUT2 RDS(ON) = 216mV
Given that the thermal resistance of a properly soldered
DFN package is approximately 40°C/W, the junction
temperature of an LTC3419 device operating in a 70°C
ambient temperature is approximately:
TJ = (2 0.216W 40°C/W) + 70°C = 87.3°C
which is well below the absolute maximum junction tem-
perature of 125°C.
PC Board Layout Considerations
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of
the LTC3419. These items are also illustrated graphically
in the layout diagrams of Figures 2 and 3. Check the fol-
lowing in your layout:
1. Does the capacitor CIN connect to the power VIN (Pin 5)
and GND (Pin 9) as closely as possible? This capacitor
provides the AC current of the internal power MOSFETs
and their drivers.
2. Are the respective COUT and L closely connected? The
(–) plate of COUT returns current to GND and the (–)
plate of CIN.
3. The resistor divider, R1 and R2, must be connected
between the (+) plate of COUT1 and a ground sense line
terminated near GND (Pin 9). The feedback signals VFB1
and VFB2 should be routed away from noisy components
and traces, such as the SW lines (Pins 4 and 6), and
their trace length should be minimized.
4. Keep sensitive components away from the SW pins, if
possible. The input capacitor CIN and the resistors R1,
R2, R3 and R4 should be routed away from the SW
traces and the inductors.
5. A ground plane is preferred, but if not available, keep
the signal and power grounds segregated with small
signal components returning to the GND pin at a single
point. These ground traces should not share the high
current path of CIN or COUT.
6. Flood all unused areas on all layers with copper.
Flooding with copper will reduce the temperature rise
of power components. These copper areas should be
connected to VIN or GND.
APPLICATIONS INFORMATION
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| LTC3419IDD#PBF | 功能描述:IC REG BUCK SYNC ADJ .6A DL 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數:1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關:2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應商設備封裝:6-SON（1.45x1） 產品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LTC3419IDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ .6A DL 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 輸出數:1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
| LTC3419IDD-1#PBF | 功能描述:IC REG BUCK SYNC ADJ .6A DL 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 輸出數:1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
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