- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377748 > LTC1439CGW (LINEAR TECHNOLOGY CORP) Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators PDF資料下載
參數(shù)資料
| 型號： | LTC1439CGW |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Dual High Efficiency, Low Noise, Synchronous Step-Down Switching Regulators |
| 中文描述： | 2 A DUAL SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO36 |
| 封裝： | 0.300 INCH, PLASTIC, SSOP-36 |
| 文件頁數(shù)： | 11/32頁 |
| 文件大?。?/td> | 596K |
| 代理商： | LTC1439CGW |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁當前第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁
11
LTC1438/LTC1439
OPERATIO
Frequency Synchronization
A Phase-Locked Loop (PLL) is available on the LTC1439
to allow the oscillator to be synchronized to an external
source connected to the PLLIN pin. The output of the
phase detector at the PLL LPF pin is also the control input
of the oscillator, which operates over a 0V to 2.4V range
corresponding to –30% to 30% in frequency. When
locked, the PLL aligns the turn-on of the top MOSFET to
the rising edge of the synchronizing signal. When PLLIN
is left open, PLL LPF goes low, forcing the oscillator to
minimum frequency.
U
the AUXDR pin is above 9.5V to allow regulated 12V
VPP supplies to be easily implemented. When AUXDR is
below 8.5V an external feedback divider may be used to set
other output voltages. Taking the AUXON pin low shuts
down the auxiliary regulator providing a convenient logic-
controlled power supply.
The AUX block can be used as a comparator having its
inverting input tied to the internal 1.19V reference. The
AUXDR pin is used as the output and requires an external
pull-up to a supply of less than 8.5V in order to inhibit the
invoking of the internal resistive divider.
INTV
CC
/EXTV
CC
Power
Power for the top and bottom MOSFET drivers and most
of the other LTC1438/LTC1439 circuitry is derived from
the INTV
CC
pin. The bottom MOSFET driver supply is also
connected to INTV
CC
. When the EXTV
CC
pin is left open, an
internal 5V low dropout regulator supplies INTV
CC
power.
If EXTV
CC
is taken above 4.8V, the 5V regulator is turned
off and an internal switch is turned on to connect EXTV
CC
to INTV
CC
. This allows the INTV
CC
power to be derived
from a high efficiency external source such as the output
of the regulator itself or a secondary winding, as described
in the Applications Information section.
(Refer to Functional Diagram)
Power-On Reset
The POR2 pin is an open drain output which pulls low
when the main regulator output voltage of the second
controller is out of regulation. When the output voltage
rises to within 7.5% of regulation, a timer is started which
releases POR2 after 2
16
(65536) oscillator cycles. This
function is not available on the LTC1438X.
Auxiliary Linear Regulator
The auxiliary linear regulator in the LTC1439 controls an
external PNP transistor for operation up to 500mA. A
precise internal AUXFB resistive divider is invoked when
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1441IS8 | Ultralow Power Single/Dual Comparator with Reference |
| LTC1440IN8 | Ultralow Power Single/Dual Comparator with Reference |
| LTC1441IN8 | Ultralow Power Single/Dual Comparator with Reference |
| LTC1442IN8 | Aluminum Electrolytic Capacitor; Capacitor Type:High Temperature; Voltage Rating:50VDC; Capacitor Dielectric Material:Aluminum Electrolytic; Operating Temperature Range:-55 C to +105 C; Capacitance:100uF RoHS Compliant: No |
| LTC1440IS8 | Ultralow Power Single/Dual Comparator with Reference |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1439CGW#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1439CGW#TR | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1439CGW#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
| LTC1439EG#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
| LTC1439EG#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 36-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝:4,000 系列:- PWM 型:電壓模式 輸出數(shù):1 頻率 - 最大:1.5MHz 占空比:66.7% 電源電壓:4.75 V ~ 5.25 V 降壓:是 升壓:無 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 85°C 封裝/外殼:40-VFQFN 裸露焊盤 包裝:帶卷 (TR) |
發(fā)布緊急采購，3分鐘左右您將得到回復。