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參數(shù)資料
| 型號： | LT3640EFE#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3.4 A DUAL SWITCHING CONTROLLER, 2350 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-28 |
| 文件頁數(shù)： | 10/24頁 |
| 文件大小： | 506K |
| 代理商： | LT3640EFE#TRPBF |
LT3640
3640f
The threshold of power-on comparator is 1.15V for the high
voltage channel, and 550mV for the low voltage channel.
Both RST1 and RST2 are open-drain outputs with weak
internal pull-ups (100k to ~2V). The DC characteristics of
the RST1 and RST2 pull-down strength are shown in the
Typical Performance Characteristics section. The weak
Reverse Protection
In battery charging applications or in battery back-up
systems, the output will be held high when the input to the
LT3640 is absent. If the VIN pin is floated and the LT3640 is
enabled,theLT3640’sinternalcircuitrywillpullitsquiescent
current through the SW1 pin or the SW2 pin. This is fine if
the system can tolerate a few mA in this state. If the LT3640
is disabled, the SW1 pin and the SW2 pin current will drop
toessentiallyzero.However,iftheVINpinisgroundedwhile
the high voltage channel output is held high, an external
diode is required at the VIN pin to prevent current being
pulled out of the VIN pin. If the VIN2 pin is grounded while
the low voltage channel output is held high, an external
diode is required at the VIN2 pin to prevent current being
pulled out of the VIN2 pin (Figure 7).
Figure 8. PFM Operation
PFM Operation
To improve efficiency at light loads, the LT3640 auto-
matically switches to pulse frequency modulation (PFM)
operation which minimizes the switching loss and keeps
the output voltage ripples small.
Because the two channels of the LT3640 may have differ-
ent loads, the two channels can have different switching
frequency (Figure 8).
Power-On Reset Timer
EachchanneloftheLT3640hasapower-oncomparator.Both
comparators are enabled when the LT3640 is powered up
andstartsmonitoringtheircorrespondingfeedbackvoltages.
Figure 7. Diodes Prevent Shorted Inputs from
Discharging a Battery Tied to the Outputs
applicaTions inForMaTion
3640 F07
OUT2
OUT1
GND
FB2
SW2
SW1
EN/UVLO
VIN
IN
SW
LT3640
BST
VIN2
FB1
DA
+
–
+
–
IN2
500ns/DIV
IL1
0.5A/DIV
SW1
10V/DIV
IL2
0.5A/DIV
SW2
5V/DIV
3640 F08a
VIN = 12V
VOUT1 = 3.3V/25mA
VIN2 = VOUT1
VOUT2 = 1.8V/30mA
2s/DIV
IL1
0.5A/DIV
SW1
10V/DIV
IL2
0.5A/DIV
SW2
5V/DIV
3640 F08b
VIN = 12V
VOUT1 = 3.3V/25mA
VIN2 = VOUT1
VOUT2 = 1.8V/20mA
2s/DIV
IL1
0.5A/DIV
SW1
10V/DIV
IL2
0.5A/DIV
SW2
5V/DIV
3640 F08c
VIN = 12V
VOUT1 = 3.3V/0mA
VIN2 = VOUT1
VOUT2 = 1.8V/30mA
(8a)
(8b)
(8c)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT3640IFE#TRPBF | 3.4 A DUAL SWITCHING CONTROLLER, 2350 kHz SWITCHING FREQ-MAX, PDSO28 |
| LT3640IUFD#PBF | 3.4 A DUAL SWITCHING CONTROLLER, 2350 kHz SWITCHING FREQ-MAX, PQCC28 |
| LT3640EUFD#TRPBF | 3.4 A DUAL SWITCHING CONTROLLER, 2350 kHz SWITCHING FREQ-MAX, PQCC28 |
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| LT3640EUFD | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer |
| LT3640EUFD#PBF | 功能描述:IC REG BUCK FIX/ADJ DL 28QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(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 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT3640EUFD#TRPBF | 功能描述:IC REG BUCK FIX/ADJ DL 28QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 設(shè)計資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細(xì)型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LT3640EUFDPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer |
| LT3640EUFDTRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Monolithic Buck Regulator with Power-On Reset and Watchdog Timer |
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