- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄224114 > LTC1435IG#TRPBF (LINEAR TECHNOLOGY CORP) High Efficiency Low Noise Synchronous Step-Down Switching Regulator PDF資料下載
參數(shù)資料
| 型號(hào)： | LTC1435IG#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | High Efficiency Low Noise Synchronous Step-Down Switching Regulator |
| 中文描述： | 2 A SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 0.209 INCH, PLASTIC, SSOP-16 |
| 文件頁(yè)數(shù)： | 4/20頁(yè) |
| 文件大小： | 338K |
| 代理商： | LTC1435IG#TRPBF |
第1頁(yè)第2頁(yè)第3頁(yè)當(dāng)前第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)
12
LTC1435
APPLICATIONS INFORMATION
WU
U
EXTVCC
VIN
TG
BG
PGND
LTC1435
N-CH
+
CIN
VIN
+
COUT
L1
RSENSE
VOUT
+
1
F
LTC1435 F04b
VN2222LL
BAT85
0.22
F
SW
Figure 4b. Capacitive Charge Pump for EXTVCC
Topside MOSFET Driver Supply (CB, DB)
An external bootstrap capacitor CB connected to the Boost
pin supplies the gate drive voltage for the topside MOSFET.
Capacitor CB in the Functional Diagram is charged through
diode DB from INTVCC when the SW pin is low. When the
topside MOSFET is to be turned on, the driver places the
CB voltage across the gate source of the MOSFET. This
enhances the MOSFET and turns on the topside switch.
The switch node voltage SW rises to VIN and the Boost pin
rises to VIN + INTVCC. The value of the boost capacitor CB
needs to be 100 times greater than the total input capaci-
tance of the topside MOSFET. In most applications 0.1
F
is adequate. The reverse breakdown on DB must be greater
than VIN(MAX).
Output Voltage Programming
The output voltage is set by a resistive divider according
to the following formula:
VV
R
OUT =+
119
1
2
1
.
The external resistor divider is connected to the output as
shown in Figure 5 allowing remote voltage sensing.
Run/ Soft Start Function
The RUN/SS pin is a dual purpose pin which provides the
soft start function and a means to shut down the LTC1435.
Figure 6. RUN/SS Pin Interfacing
LTC1435 F06
CSS
D1
3.3V OR 5V
RUN/SS
CSS
RUN/SS
Soft start reduces surge currents from VIN by gradually
increasing the internal current limit.
Power supply se-
quencing can also be accomplished using this pin.
An internal 3
A current source charges up an external
capacitor CSS. When the voltage on RUN/SS reaches 1.3V
the LTC1435 begins operating. As the voltage on RUN/SS
continues to ramp from 1.3V to 2.4V, the internal current
limit is also ramped at a proportional linear rate. The
current limit begins at approximately 50mV/RSENSE (at
VRUN/SS = 1.3V) and ends at 150mV/RSENSE (VRUN/SS >
2.7V). The output current thus ramps up slowly, charging
the output capacitor. If RUN/SS has been pulled all the way
to ground there is a delay before starting of approximately
500ms/
F, followed by an additional 500ms/F to reach
full current.
tDELAY = 5(10
5)CSS Seconds
Pulling the RUN/SS pin below 1.3V puts the LTC1435 into
a low quiescent current shutdown (IQ < 25A). This pin
can be driven directly from logic as shown in Figure 6.
Diode D1 in Figure 6 reduces the start delay but allows
CSS to ramp up slowly for the soft start function; this
diode and CSS can be deleted if soft start is not needed.
The RUN/SS pin has an internal 6V Zener clamp (See
Functional Diagram).
VOSENSE
LTC1435
R1
R2
LTC1435 F05
100pF
1.19V
≤ VOUT ≤ 9V
SGND
Figure 5. Setting the LTC1435 Output Voltage
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC1436AEGN#PBF | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC2249CUH#TR | 14-Bit, 80Msps Low Power 3V ADC; Package: QFN; No of Pins: 32; Temperature Range: 0°C to +70°C |
| LTC2249IUH#TR | 14-Bit, 80Msps Low Power 3V ADC; Package: QFN; No of Pins: 32; Temperature Range: -40°C to +85°C |
| LTC2250CUH | 10-Bit, 105Msps Low Noise 3V ADCs; Package: QFN; No of Pins: 32; Temperature Range: 0°C to +70°C |
| LTC2250CUH#TR | 10-Bit, 105Msps Low Noise 3V ADCs; Package: QFN; No of Pins: 32; Temperature Range: 0°C to +70°C |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1435IS | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 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 |
| LTC1435IS#PBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 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 |
| LTC1435IS#TR | 制造商:Linear Technology 功能描述:DC DC Cntrlr Single-OUT Sync Step Down 3.5V to 36V Input 16-Pin SOIC N T/R |
| LTC1435IS#TRPBF | 功能描述:IC REG CTRLR BUCK PWM CM 16-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 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 |
| LTC1436ACGN | 功能描述:IC REG CTRLR BUCK PWM CM 24-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(biāo)準(zhǔn)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(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 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 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。