- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377774 > LT1616 (Linear Technology Corporation) Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger PDF資料下載
參數(shù)資料
| 型號： | LT1616 |
| 廠商： | Linear Technology Corporation |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger |
| 中文描述： | 雙DC / DC轉(zhuǎn)換器的USB電源管理器和鋰離子電池充電器 |
| 文件頁數(shù)： | 21/24頁 |
| 文件大?。?/td> | 516K |
| 代理商： | LT1616 |
LTC3455
21
3455f
Hot Swap Output
A current limited Hot Swap output is provided for power-
ing memory cards or other external devices that can be
hot-plugged into the system. Typically connected to the
3.3V supply, this output provides isolation to prevent the
external device from disturbing the 3.3V supply when
inserted. The Hot Swap output can only operate when the
LTC3455 is on, and is enabled using the HSON pin. If this
hot-plugging protection is not needed, this output can be
used as a load switch for other devices within the system.
The HSO pin is discharged to ground when the LTC3455
is shut down.
Gain Block
The LTC3455 contains a gain block (pins AI and AO) that
can be used as either a low-battery indicator, or as an LDO
with the addition of an external PNP. Both circuits are
shown in Figure 13. The LDO is convenient for applications
needing a third output (possibly a low current 2.5V or a
quiet 3V supply). The AO pin can sink around 1mA, which
typically limits the LDO current to 100mA or less (due to
the current gain of the PNP). An external PMOS can be
used for the LDO, but a much larger output capacitor is
needed to ensure stability at light loads.
The gain block is alive whenever switcher 1 is enabled, and
is turned off during shutdown to minimize battery drain.
This means that the low-battery detector will not report a
low-battery condition until the LTC3455 is turned on. This
APPLICATIU
W
U
U
is not a problem for most applications since the LTC3455
usually powers the microcontroller and all other intelli-
gence in the system.
PCB Layout Considerations
As with all DC/DC converters, careful attention must be
paid to the printed circuit board (PCB) layout and compo-
nent placement. The V
BAT
capacitor, V
MAX
capacitor, and
both inductors must all be placed as close as possible to
the LTC3455. These components, along with both DC/DC
converter output capacitors, should be placed on the same
side of the circuit board as the LTC3455, with their
connections made on that top layer. Place a local, unbro-
ken ground plane below these components that is tied to
the exposed pad of the LTC3455. The exposed pad (pin 25)
must be soldered to the PCB (to system ground) for proper
operation.
Figure 13. Low-Battery Detector and LDO Using the Gain Block
1.8V
LBO
17
1M
LOW-BATTERY
DECTECTOR
V
BAT
16
2.49M
806k
3.3V
17
100k
3455 F14
LDO
2.5V
16
169k
100pF
80.6k
AO
LTC3455
AI
AO
LTC3455
AI
10
μ
F
TYPICAL APPLICATIO S
Standalone USB Power Supply
with Temporary Backup Power
Although designed primarily for Li-Ion powered portable
applications, the LTC3455 is also a good choice for
systems that are always powered by a USB supply or wall
adapter. The battery charger can then be used to charge up
a large capacitor or backup battery, which briefly provides
power to the system after the external power has been
removed. This gives the microcontroller enough time to
follow proper shutdown procedures when the main power
source is abruptly removed. Figure 14 shows a standalone
power supply for USB high power applications (500mA
maximum USB current) using the LTC3455. The total
system power should be kept below 1.8W to ensure clean
operation even under worst-case USB conditions. With
the resistor values shown, the low-battery indicator (AI
and AO pins) triggers when the V
MAX
pin voltage drops to
4V, notifying the microcontroller of an impending dropout
condition. The 1M
resistor connected between the AI
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3406A | Standalone Linear Li-lon Battery Charger with Thermistor Input |
| LTC3406B | Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger |
| LTC3406ES5 | 1.5MHz, 600mA Synchronous Step-Down Regulator in ThinSOT |
| LTC3407 | Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger |
| LTC3412 | Dual DC/DC Converter with USB Power Manager and Li-Ion Battery Charger |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT1616ES6 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| LT1616ES6#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 25V 6-Pin TSOT-23 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 3.6V to 25V 6-Pin TSOT-23 Bulk 制造商:Linear Technology 功能描述:IC, DC-DC CONV; Primary Input Voltage:25V; No. of Outputs:1; Output Voltage:3.3V; Output Current:400mA; No. of Pins:6; Operating Temperature Min:-40C; Operating Temperature Max:85C; MSL:MSL 1 - Unlimited ;RoHS Compliant: Yes |
| LT1616ES6#TR | 功能描述:IC REG BUCK 3.3V/5V 0.6A SOT23-6 RoHS:否 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: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 - 開關(guān):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(yīng)商設(shè)備封裝:8-SOIC |
| LT1616ES6#TRM | 功能描述:IC REG BUCK 3.3V/5V 0.6A SOT23-6 RoHS:否 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: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 - 開關(guān):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(yīng)商設(shè)備封裝:8-SOIC |
| LT1616ES6#TRMPBF | 功能描述:IC REG BUCK 3.3V/5V 0.6A SOT23-6 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: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)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。