- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄98002 > LTC1626CS#TR (LINEAR TECHNOLOGY CORP) 1.6 A SWITCHING REGULATOR, PDSO14 PDF資料下載
參數(shù)資料
| 型號(hào)： | LTC1626CS#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 1.6 A SWITCHING REGULATOR, PDSO14 |
| 封裝： | 0.150 INCH, PLASTIC, SO-14 |
| 文件頁(yè)數(shù)： | 9/12頁(yè) |
| 文件大?。?/td> | 258K |
| 代理商： | LTC1626CS#TR |
6
LTC1626
APPLICATIONS INFORMATION
WU
U
inductor current should be continuous during burst peri-
ods. Hence, the peak-to-peak inductor ripple current must
not exceed 25mV/RSENSE.
To account for light load conditions, the IOUT(MAX) is then
given by:
IOUT(MAX) = 150mV/RSENSE – 25mV/2RSENSE (A)
= 137.5mV/RSENSE (A)
Solving for RSENSE and allowing a margin of variations in
the LTC1626 and external component values yields:
RSENSE = 100mV/IOUT(MAX) ()
The LTC1626 switch is capable of supplying a maximum
of 1.2A of output current.
Therefore, the minimum value
of RSENSE that can be used is 0.083. A graph for
selecting RSENSE versus maximum output current is given
in Figure 2.
Operating Frequency Considerations
For most applications, the LTC1626 should be operated in
the 100kHz to 300kHz range. This range can be extended,
however, up to 600kHz, to accommodate smaller size/
valued inductors, such as low profile types, with a slight
decrease in efficiency due to gate charge losses. Some
experimentation may be required to determine the opti-
mum operating frequency for a particular set of external
components and operating conditions.
CT and L Selection
The value of CT is calculated from the desired continuous
mode operating frequency:
C
VV
V
f
F
T
IN
OUT
IN
D
IN
BE
O
=
()
+
()( )
()( ) ()
3300
where VD is the drop across the Schottky diode D1 and VBE
is a base-emitter voltage drop (0.6V).
The complete expression for operating frequency is given
by:
f
t
VV
Hz
O
OFF
IN
OUT
IN
D
≈
+
()
1
where:
tC
V
OFF
T
IN
BE
=
()( )
() ( )
3300
sec
Figure 3 is a graph of operating frequency versus power
supply voltage for the 2.5V regulator circuit shown in
Figure 1 (CT = 270pF). Note that the frequency is relatively
constant with supply voltage but drops as the supply
voltage approaches the regulated output voltage.
To maintain continuous inductor current at light load, the
inductor must be chosen to provide no more than 25mV/
RSENSE of peak-to-peak ripple current. This results in the
following expression for L:
LRSENSE
≥
()
()( )(
) ( )
52 105
.
C
V
H
T
REG
Using an inductance smaller than the above value will
result in inductor current being discontinuous. As a con-
MAXIMUM OUTPUT CURRENT (A)
0.5
0.4
0.3
0.2
0.1
0
R
SENSE
(
)
1626 F02
0.6
0.8
1.0
0.4
0
0.2
Figure 2. Selecting RSENSE
During a short circuit of the regulator output to ground, the
peak current is determined by:
ISC = 150mV/RSENSE (A)
In this condition, the LTC1626 automatically extends the
off-time period of the P-channel MOSFET switch to allow
the inductor current to decay far enough to prevent any
current buildup. The resulting ripple current causes the
average current to be approximately IOUT(MAX).
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1732EMS-4.2#TR | BATTERY CHARGE CONTROLLER, PDSO10 |
| LTC1772IS6#PBF | 1 A SWITCHING CONTROLLER, 650 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC1938IDD#TRPBF | 4 A SWITCHING REGULATOR, 3300 kHz SWITCHING FREQ-MAX, PDSO10 |
| LTC1955IUH#TR | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
| LTC1955IUH | 2-CHANNEL POWER SUPPLY SUPPORT CKT, PQCC32 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1627CS8 | 功能描述:IC REG BUCK SYNC ADJ 0.5A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 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(yīng)商設(shè)備封裝:8-SOIC |
| LTC1627CS8#PBF | 功能描述:IC REG BUCK SYNC ADJ 0.5A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):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(kāi)關(guān):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(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁(yè)面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LTC1627CS8#TR | 功能描述:IC REG BUCK SYNC ADJ 0.5A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 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(yīng)商設(shè)備封裝:8-SOIC |
| LTC1627CS8#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 0.5A 8SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)式 輸出數(shù):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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 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(yīng)商設(shè)備封裝:8-SOIC |
| LTC1627IS8 | 功能描述:IC REG BUCK SYNC ADJ 0.5A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開(kāi)關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤(pán) 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤(pán) |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。